Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145215
Y. Li, Wei Liang, Jindong Tan, Yinlong Zhang
Despite recent advances, robust automatic segmentation for vertebrae computed tomography (CT) image still presents considerable challenges, mainly due to its inherent limitations, such as topological variation, irregular boundaries (double boundary, weak boundary) and image noises, etc. Therefore, this paper proposes a novel automatically initialized level set approach based on region correlation, which is able to deal with these problems in the segmentation. First, an automatically initialized level set function (AILSF) is designed to automatically generate a smooth initial contour. This AILSF comprises hybrid morphological filter (HMF) and Gaussian mixture model (GMM), which can guarantee the initial contour precisely adjacent to the object boundary. Second, we introduce a region correlation based level set formulation, which simultaneously consider the histogram information of inside and outside the level set contour, to overcome the weak boundary leaking and image noises problem. Experimental results on clinical lumbar vertebrae CT images demonstrate that our proposed approach is more accurate in segmenting with irregular boundaries and more robust to different levels of salt-and-pepper noises.
{"title":"A novel automatically initialized level set approach based on region correlation for lumbar vertebrae CT image segmentation","authors":"Y. Li, Wei Liang, Jindong Tan, Yinlong Zhang","doi":"10.1109/MeMeA.2015.7145215","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145215","url":null,"abstract":"Despite recent advances, robust automatic segmentation for vertebrae computed tomography (CT) image still presents considerable challenges, mainly due to its inherent limitations, such as topological variation, irregular boundaries (double boundary, weak boundary) and image noises, etc. Therefore, this paper proposes a novel automatically initialized level set approach based on region correlation, which is able to deal with these problems in the segmentation. First, an automatically initialized level set function (AILSF) is designed to automatically generate a smooth initial contour. This AILSF comprises hybrid morphological filter (HMF) and Gaussian mixture model (GMM), which can guarantee the initial contour precisely adjacent to the object boundary. Second, we introduce a region correlation based level set formulation, which simultaneously consider the histogram information of inside and outside the level set contour, to overcome the weak boundary leaking and image noises problem. Experimental results on clinical lumbar vertebrae CT images demonstrate that our proposed approach is more accurate in segmenting with irregular boundaries and more robust to different levels of salt-and-pepper noises.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"4 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113979338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145202
E. Schena, P. Saccomandi, C. Massaroni, G. Frauenfelder, F. Giurazza, G. M. Peroglio, S. Silvestri, M. Caponero, A. Polimadei
Laser ablation (LA) is a minimally invasive procedure used to remove cancer by inducing hyperthermia. It is based on the interaction between laser light and tissue: the absorbed light is converted into heat causing a tissue temperature increase. The amount of damaged volume depends on temperature and time exposure of the tissue to the hyperthermia. As a consequence, the monitoring of tissue temperature during LA could be particularly beneficial to optimize treatment outcomes. Thermocouples are one of the most employed transducer for temperature measurement. Their main drawback is related to the strong light absorption of the two metallic wires which constitute a thermocouple. The light absorption causes an overestimation of actual temperature, in literature known as artifact. This work aims at assessing this artifact on ex vivo swine pancreases undergoing LA. The artifacts have been estimated at the three laser powers (1.6 W, 2 W and 5 W) and at two distances from the optical applicator. In particular, the artifact decreases with the distance from the optical applicator and depends on P: at 1.6 W and 2 W it is negligible at 12 mm of distance, on the other hand at 5 W it is significant also at 15 mm (1.7 °C). Summing up: the artifact is strongly influenced by the distance between the thermocouple and the optical applicator, and by the laser power; also at high distance from the applicator it can cause error which are not acceptable for the application of interest (e.g., at 5 W and 10 mm the error is about 4 °C). Although the use of thermocouples entails the concern related to the artifact, it must be considered that proper model can be employed to correct the measurement error.
{"title":"Thermocouples for temperature monitoring during pancreatic laser ablation: Analysis of the measurement error","authors":"E. Schena, P. Saccomandi, C. Massaroni, G. Frauenfelder, F. Giurazza, G. M. Peroglio, S. Silvestri, M. Caponero, A. Polimadei","doi":"10.1109/MeMeA.2015.7145202","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145202","url":null,"abstract":"Laser ablation (LA) is a minimally invasive procedure used to remove cancer by inducing hyperthermia. It is based on the interaction between laser light and tissue: the absorbed light is converted into heat causing a tissue temperature increase. The amount of damaged volume depends on temperature and time exposure of the tissue to the hyperthermia. As a consequence, the monitoring of tissue temperature during LA could be particularly beneficial to optimize treatment outcomes. Thermocouples are one of the most employed transducer for temperature measurement. Their main drawback is related to the strong light absorption of the two metallic wires which constitute a thermocouple. The light absorption causes an overestimation of actual temperature, in literature known as artifact. This work aims at assessing this artifact on ex vivo swine pancreases undergoing LA. The artifacts have been estimated at the three laser powers (1.6 W, 2 W and 5 W) and at two distances from the optical applicator. In particular, the artifact decreases with the distance from the optical applicator and depends on P: at 1.6 W and 2 W it is negligible at 12 mm of distance, on the other hand at 5 W it is significant also at 15 mm (1.7 °C). Summing up: the artifact is strongly influenced by the distance between the thermocouple and the optical applicator, and by the laser power; also at high distance from the applicator it can cause error which are not acceptable for the application of interest (e.g., at 5 W and 10 mm the error is about 4 °C). Although the use of thermocouples entails the concern related to the artifact, it must be considered that proper model can be employed to correct the measurement error.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123866193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145196
I. Spano, S. Sulis, A. Serpi, I. Marongiu, G. Gatto, V. Nissardi
An Automatic Sensing Test procedure (AST) for evaluating the sensing performances of Implantable Cardioverter Defibrillators (ICDs) is presented in this paper. AST is based on the Sensitivity Test described by the Standard CEI EN 45502-2-1 for pacemakers and consists of determining the ICD sensing thresholds at different heartbeat frequencies. Consequently, an extensive evaluation of ICD sensing performances can be achieved. AST has been implemented by means of virtual instruments developed in the Labview environment and has been validated experimentally through several tests. These have been performed inside an anechoic RF chamber. Such an environment guarantees proper shielding against external electromagnetic interferences, thus ensuring reliability and repeatability of the tests. The discussion of the results highlights the usefulness of the proposed procedure.
本文提出了一种用于评估植入式心律转复除颤器(ICDs)感知性能的自动感知测试程序(AST)。AST是基于标准CEI EN 45502-2-1对起搏器描述的灵敏度测试，包括确定不同心跳频率下的ICD传感阈值。因此，可以实现对ICD传感性能的广泛评估。AST采用Labview环境下开发的虚拟仪器实现，并通过多次实验验证。这些都是在消声射频室中进行的。这样的环境保证了对外部电磁干扰的适当屏蔽，从而确保了测试的可靠性和可重复性。对结果的讨论突出了所建议程序的有效性。
{"title":"An Automatic Sensing Test procedure for Implantable Cardioverter Defibrillators","authors":"I. Spano, S. Sulis, A. Serpi, I. Marongiu, G. Gatto, V. Nissardi","doi":"10.1109/MeMeA.2015.7145196","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145196","url":null,"abstract":"An Automatic Sensing Test procedure (AST) for evaluating the sensing performances of Implantable Cardioverter Defibrillators (ICDs) is presented in this paper. AST is based on the Sensitivity Test described by the Standard CEI EN 45502-2-1 for pacemakers and consists of determining the ICD sensing thresholds at different heartbeat frequencies. Consequently, an extensive evaluation of ICD sensing performances can be achieved. AST has been implemented by means of virtual instruments developed in the Labview environment and has been validated experimentally through several tests. These have been performed inside an anechoic RF chamber. Such an environment guarantees proper shielding against external electromagnetic interferences, thus ensuring reliability and repeatability of the tests. The discussion of the results highlights the usefulness of the proposed procedure.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124714550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145273
A. Ancillao, S. Rossi, F. Patané, P. Cappa
Strength measurements are popular in the clinical practice to evaluate the health status of patients and quantify the outcome of training programs. Currently a common method to measure strength is based on Hand Held Dynamometers (HHD) which is operator-dependent. Some studies were conducted on repeatability of strength measurements but they were limited to the statistical analysis of repeated measurements of force. In this work, the authors developed a methodology to study the quality of knee flexion/extension strength measurements by measuring the effective HHD position and orientation with respect to the patient. HHD positioning attitude was measured by means of an Optoelectronic System for which a marker protocol was defined ad-hoc. The approach allowed to assess quality of measurements and operator's ability by means of quantitative indices. The protocol permitted the evaluation of: angles of HHD application, angular range of motion of the knee and range of motion of the HHD. RMSE parameters allowed to quantify the inaccuracy associated to the selected indices. Results showed that the operator was not able to keep the subject's limb completely still. The force exerted by the subject was higher in knee extension and the knee range of motion was higher than expected, however the operator had more difficulties in holding the HHD in knee flexion trials. This work showed that HHD positioning should be as accurate as possible, as it plays an important role for the strength evaluation. Moreover, the operator should be properly trained and should be strong enough to counteract the force of the subject.
{"title":"A preliminary study on quality of knee strength measurements by means of Hand Held Dynamometer and Optoelectronic System","authors":"A. Ancillao, S. Rossi, F. Patané, P. Cappa","doi":"10.1109/MeMeA.2015.7145273","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145273","url":null,"abstract":"Strength measurements are popular in the clinical practice to evaluate the health status of patients and quantify the outcome of training programs. Currently a common method to measure strength is based on Hand Held Dynamometers (HHD) which is operator-dependent. Some studies were conducted on repeatability of strength measurements but they were limited to the statistical analysis of repeated measurements of force. In this work, the authors developed a methodology to study the quality of knee flexion/extension strength measurements by measuring the effective HHD position and orientation with respect to the patient. HHD positioning attitude was measured by means of an Optoelectronic System for which a marker protocol was defined ad-hoc. The approach allowed to assess quality of measurements and operator's ability by means of quantitative indices. The protocol permitted the evaluation of: angles of HHD application, angular range of motion of the knee and range of motion of the HHD. RMSE parameters allowed to quantify the inaccuracy associated to the selected indices. Results showed that the operator was not able to keep the subject's limb completely still. The force exerted by the subject was higher in knee extension and the knee range of motion was higher than expected, however the operator had more difficulties in holding the HHD in knee flexion trials. This work showed that HHD positioning should be as accurate as possible, as it plays an important role for the strength evaluation. Moreover, the operator should be properly trained and should be strong enough to counteract the force of the subject.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124928971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145237
R. Ciobanu, C. Schreiner, V. Drug, T. Schreiner, Dorin Antal
The lab-on-chip testing units based on microfluidics technology are booming nowadays, due to robustness, simplicity of use and reliability. Multilayer ceramics, functionalized with nano-scaled sensing materials, and further integrated within microfluidic test elements, are of great challenge and represent the purpose of the paper. The LTCC technology versatility allows the 3D integration of electrochemical sensors with microfluidic features, and further with advanced signal processing and wireless communication.
{"title":"Sensors in LTCC-technology with embedded microfluidic features, for medical applications","authors":"R. Ciobanu, C. Schreiner, V. Drug, T. Schreiner, Dorin Antal","doi":"10.1109/MeMeA.2015.7145237","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145237","url":null,"abstract":"The lab-on-chip testing units based on microfluidics technology are booming nowadays, due to robustness, simplicity of use and reliability. Multilayer ceramics, functionalized with nano-scaled sensing materials, and further integrated within microfluidic test elements, are of great challenge and represent the purpose of the paper. The LTCC technology versatility allows the 3D integration of electrochemical sensors with microfluidic features, and further with advanced signal processing and wireless communication.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127168727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145195
Giuseppe Cicotti, A. Coronato
Medical Devices (MDs) are subject to a Risk Management process to guarantee their safety with respect to risks patients and healthcare operators may experience. Well known classical Probabilistic Risk Assessment (PRA) techniques widely used in the MD sector, such as Failure Model and Effective Critical Analysis (FMEA) and Fault-Tree/Event-Tree do not allow to model the dynamics of hazardous situations which involves interactions among system components, human actions, process operations and the environment. This lack is overcome by using a dynamic PRA (DPRA) approach which aids in specifying risk scenarios. DPRA is extensively used in the nuclear, avionics, and space industries to identify possible accident scenarios, but to the best of our knowledge it is not so in the MD field. In this paper we propose a DPRA approach for MD Risk Assessment which relies on the use of a Probabilistic Model Checking (PMC) technique to perform quantitative analysis of risk scenarios. Particularly, our approach combines the ease of Event Sequence Diagram (ESD) to capture the dynamics of risk scenarios and the Markov Decision Processes formalism used as a stochastic model by which to encode ESD. By using a PMC technique to evaluate the MDP-based risk scenarios, we achieve two main benefits. Firstly, hundreds of different scenario realisations can be analysed in seconds due to the computational effectiveness of current PMC algorithms. Secondly, since such technique is based on a state-transition representation, we take advantage of the reachability analysis of states within the risk scenario state space to also quantify the effectiveness of control mechanisms or mitigation actions used to prevent and/or reduce the MD exposition to risk factors. Our ultimate objective is to derive an intuitive, easy, and computationally efficient formal method to perform quantitative risk scenario analysis oriented towards increasing the MD safety. We have applied our approach to an actual MD taken as a case study to demonstrate the features of our DPRA solution.
{"title":"Towards a Probabilistic Model Checking-based approach for Medical Device Risk Assessment","authors":"Giuseppe Cicotti, A. Coronato","doi":"10.1109/MeMeA.2015.7145195","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145195","url":null,"abstract":"Medical Devices (MDs) are subject to a Risk Management process to guarantee their safety with respect to risks patients and healthcare operators may experience. Well known classical Probabilistic Risk Assessment (PRA) techniques widely used in the MD sector, such as Failure Model and Effective Critical Analysis (FMEA) and Fault-Tree/Event-Tree do not allow to model the dynamics of hazardous situations which involves interactions among system components, human actions, process operations and the environment. This lack is overcome by using a dynamic PRA (DPRA) approach which aids in specifying risk scenarios. DPRA is extensively used in the nuclear, avionics, and space industries to identify possible accident scenarios, but to the best of our knowledge it is not so in the MD field. In this paper we propose a DPRA approach for MD Risk Assessment which relies on the use of a Probabilistic Model Checking (PMC) technique to perform quantitative analysis of risk scenarios. Particularly, our approach combines the ease of Event Sequence Diagram (ESD) to capture the dynamics of risk scenarios and the Markov Decision Processes formalism used as a stochastic model by which to encode ESD. By using a PMC technique to evaluate the MDP-based risk scenarios, we achieve two main benefits. Firstly, hundreds of different scenario realisations can be analysed in seconds due to the computational effectiveness of current PMC algorithms. Secondly, since such technique is based on a state-transition representation, we take advantage of the reachability analysis of states within the risk scenario state space to also quantify the effectiveness of control mechanisms or mitigation actions used to prevent and/or reduce the MD exposition to risk factors. Our ultimate objective is to derive an intuitive, easy, and computationally efficient formal method to perform quantitative risk scenario analysis oriented towards increasing the MD safety. We have applied our approach to an actual MD taken as a case study to demonstrate the features of our DPRA solution.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116199864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145222
L. Iuppariello, P. Bifulco, M. Romano, M. Cesarelli, G. D'Addio
The segmentation of seemingly continuous movements into segments has been theorized for many years. These segments may be considered as “primitive” movements, or building blocks of more complex movements. The existence of these fragments, or sub-movements as they are called, has been supported by a wide range of studies over the past 100 years. Evidence for the existence of discrete sub-movements underlying continuous human movement has motivated many attempts to “extract” them. Recently, the sub-movement theory gained a great appeal in the rehabilitation field. In fact, understanding movement deficits following CNS lesions, and the relationships between these deficits and functional ability, is fundamental to the development of successful rehabilitation therapies. So, here a novel sub-movements decomposition method is proposed; it is based on a constrained-Expectation-Maximization. This representation allowed us to explore whether the movements are built up of elementary kinematic units by decomposing each signal into a weighted combination of 2D Gaussian functions. These can be used to assess the quality of reaching movements in subjects with Parkinson's Disease.
{"title":"Submovements composition and quality assessment of reaching movements in subjects with Parkinson's Disease","authors":"L. Iuppariello, P. Bifulco, M. Romano, M. Cesarelli, G. D'Addio","doi":"10.1109/MeMeA.2015.7145222","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145222","url":null,"abstract":"The segmentation of seemingly continuous movements into segments has been theorized for many years. These segments may be considered as “primitive” movements, or building blocks of more complex movements. The existence of these fragments, or sub-movements as they are called, has been supported by a wide range of studies over the past 100 years. Evidence for the existence of discrete sub-movements underlying continuous human movement has motivated many attempts to “extract” them. Recently, the sub-movement theory gained a great appeal in the rehabilitation field. In fact, understanding movement deficits following CNS lesions, and the relationships between these deficits and functional ability, is fundamental to the development of successful rehabilitation therapies. So, here a novel sub-movements decomposition method is proposed; it is based on a constrained-Expectation-Maximization. This representation allowed us to explore whether the movements are built up of elementary kinematic units by decomposing each signal into a weighted combination of 2D Gaussian functions. These can be used to assess the quality of reaching movements in subjects with Parkinson's Disease.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116822435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145267
Muhammad Naveed Tabassum, I. Elshafiey, Mubashir Alam
This paper proposes efficient algorithms to enhance the nearfield electromagnetic imaging of human head. Forward problem is modeled using SAM head phantom with brain tumor anomalies, surrounded by a circular applicator antenna array. Scattered signals are compressively sensed (CS) at a limited number of sensing positions, and the sensed signals are preprocessed efficiently using a proposed novel technique to maximize information extraction. A dictionary is formed and then implemented in CS based inverse problem analysis. Reconstructed images are enhanced using new post-processing techniques to improve the spatial resolution. Image quality is analyzed using the quality metric in terms of peak signal-to-noise ratio (PSNR). The quality of the reconstructed images and the corresponding PSNR values reveals the validity of the imaging techniques.
{"title":"Efficient techniques to enhance nearfield imaging of human head for anomaly detection","authors":"Muhammad Naveed Tabassum, I. Elshafiey, Mubashir Alam","doi":"10.1109/MeMeA.2015.7145267","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145267","url":null,"abstract":"This paper proposes efficient algorithms to enhance the nearfield electromagnetic imaging of human head. Forward problem is modeled using SAM head phantom with brain tumor anomalies, surrounded by a circular applicator antenna array. Scattered signals are compressively sensed (CS) at a limited number of sensing positions, and the sensed signals are preprocessed efficiently using a proposed novel technique to maximize information extraction. A dictionary is formed and then implemented in CS based inverse problem analysis. Reconstructed images are enhanced using new post-processing techniques to improve the spatial resolution. Image quality is analyzed using the quality metric in terms of peak signal-to-noise ratio (PSNR). The quality of the reconstructed images and the corresponding PSNR values reveals the validity of the imaging techniques.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116171149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145218
G. Lupi, A. Scorza, Maria Livia Rugiano, S. Sciuto, F. Bini
Magnetic Resonance Imaging (MRI) scanners are widely used both for diagnostic purpose and in studies on material properties. As a consequence they play an important role in diagnosis of diseases and in materials investigations. MRI Quality assurance tests are mandatory to obtain and maintain optimal images during time, some institutional organizations have proposed requirements on MRI image quality even if there are no worldwide standardization procedures .The purpose of this study is to design a novel MRI phantom useful to evaluate basic image quality requirements: our phantom is designed, realized and tested in order to define specific image assurance protocols and tests. Moreover the developed device is low cost, reusable and can be filled with different MRI-compatible materials. In our application the phantom is filled with water and paraffin to compare contrast resolution and signal-to-noise ratio measurements for a same scanner. Tests have been performed on a 3T scanner with 7 different scansion settings. First experimental results are encouraging and confirm a previous theoretical investigation on the employed material characteristics. Therefore other tests and data are going to be collected for the future development and performance improvement of the device.
{"title":"Preliminary study for a water-paraffin based phantom in MRI quality assurance test","authors":"G. Lupi, A. Scorza, Maria Livia Rugiano, S. Sciuto, F. Bini","doi":"10.1109/MeMeA.2015.7145218","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145218","url":null,"abstract":"Magnetic Resonance Imaging (MRI) scanners are widely used both for diagnostic purpose and in studies on material properties. As a consequence they play an important role in diagnosis of diseases and in materials investigations. MRI Quality assurance tests are mandatory to obtain and maintain optimal images during time, some institutional organizations have proposed requirements on MRI image quality even if there are no worldwide standardization procedures .The purpose of this study is to design a novel MRI phantom useful to evaluate basic image quality requirements: our phantom is designed, realized and tested in order to define specific image assurance protocols and tests. Moreover the developed device is low cost, reusable and can be filled with different MRI-compatible materials. In our application the phantom is filled with water and paraffin to compare contrast resolution and signal-to-noise ratio measurements for a same scanner. Tests have been performed on a 3T scanner with 7 different scansion settings. First experimental results are encouraging and confirm a previous theoretical investigation on the employed material characteristics. Therefore other tests and data are going to be collected for the future development and performance improvement of the device.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116618604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-07DOI: 10.1109/MeMeA.2015.7145239
Johannes C. Ayena, Landry Delphin Chapwouo Tchakouté, M. Otis, B. Ménélas
The aim of this study is to improve and facilitate the methods used to assess risk of falling among older people at home. We propose an automatic version of One-Leg Standing (OLS) test for risk of falling assessment by using a Smartphone and an instrumented insole. For better clinical assessment tests, this study focuses on exploring methods to combine the most important parameters of risk of falling into a single score. Twenty-three volunteers participated in this study for evaluating the effectiveness of the proposed system which includes eleven elderly participants: seven healthy elderly (67.16 ± 4.24 years), four Parkinson disease (PD) subjects (70 ± 12.73 years); and twelve healthy young adults (28.27 ± 3.74 years). Our work suggests that there is an inverse relationship between OLS score proposed and risk of falling. Proposed instrumented insole and application running on Android could be useful at home as a diagnostic aid tool for analyzing the performance of elderly people in OLS test.
{"title":"An efficient home-based risk of falling assessment test based on Smartphone and instrumented insole","authors":"Johannes C. Ayena, Landry Delphin Chapwouo Tchakouté, M. Otis, B. Ménélas","doi":"10.1109/MeMeA.2015.7145239","DOIUrl":"https://doi.org/10.1109/MeMeA.2015.7145239","url":null,"abstract":"The aim of this study is to improve and facilitate the methods used to assess risk of falling among older people at home. We propose an automatic version of One-Leg Standing (OLS) test for risk of falling assessment by using a Smartphone and an instrumented insole. For better clinical assessment tests, this study focuses on exploring methods to combine the most important parameters of risk of falling into a single score. Twenty-three volunteers participated in this study for evaluating the effectiveness of the proposed system which includes eleven elderly participants: seven healthy elderly (67.16 ± 4.24 years), four Parkinson disease (PD) subjects (70 ± 12.73 years); and twelve healthy young adults (28.27 ± 3.74 years). Our work suggests that there is an inverse relationship between OLS score proposed and risk of falling. Proposed instrumented insole and application running on Android could be useful at home as a diagnostic aid tool for analyzing the performance of elderly people in OLS test.","PeriodicalId":277757,"journal":{"name":"2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125884417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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