Pub Date : 2016-05-15DOI: 10.1109/MeMeA.2016.7533734
S. Rosati, V. Giannini, C. Castagneri, D. Regge, G. Balestra
Current research in radiology field is increasingly focusing on developing computer aided detection (CAD) systems able to support radiologists in the detection of suspicious regions, reducing oversight, errors and working time. Prostate cancer (PCa) is the most common cancer afflicting men in USA. Multiparametric Magnetic Resonance (mp-MR) imaging is recently emerging as a powerful tool for PCa diagnosis. The development of CAD systems for its automatic processing and elaboration is growing but they can be affected by the variation of the imaging characteristics of PCa depending on its aggressiveness and location. The aim of this study is to characterize the homogeneity of a large set of data derived from mp-MR images, in order to assess the effect on the performances of a CAD system for PCa detection. Firstly, 15 semiquantitative and quantitative features were extracted from malignant and normal region of interest in 60 patients, who underwent mp-MR exam before prostatectomy. Then, we used a clustering procedure based on a Self-Organizing Map (SOM) for grouping patients with similar characteristics from the features point of view. Finally, we evaluated the impact of this partition on the malignant voxel detection by means of a classifier based on a set of SOMs trained and tested using only those patient belonging to the same cluster. We compared these results with those obtained using a unique classifier for all patients. From our analysis it emerged that the image partition in homogeneous groups can effectively improve the final detection performances.
{"title":"Dataset homogeneity assessment for a prostate cancer CAD system","authors":"S. Rosati, V. Giannini, C. Castagneri, D. Regge, G. Balestra","doi":"10.1109/MeMeA.2016.7533734","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533734","url":null,"abstract":"Current research in radiology field is increasingly focusing on developing computer aided detection (CAD) systems able to support radiologists in the detection of suspicious regions, reducing oversight, errors and working time. Prostate cancer (PCa) is the most common cancer afflicting men in USA. Multiparametric Magnetic Resonance (mp-MR) imaging is recently emerging as a powerful tool for PCa diagnosis. The development of CAD systems for its automatic processing and elaboration is growing but they can be affected by the variation of the imaging characteristics of PCa depending on its aggressiveness and location. The aim of this study is to characterize the homogeneity of a large set of data derived from mp-MR images, in order to assess the effect on the performances of a CAD system for PCa detection. Firstly, 15 semiquantitative and quantitative features were extracted from malignant and normal region of interest in 60 patients, who underwent mp-MR exam before prostatectomy. Then, we used a clustering procedure based on a Self-Organizing Map (SOM) for grouping patients with similar characteristics from the features point of view. Finally, we evaluated the impact of this partition on the malignant voxel detection by means of a classifier based on a set of SOMs trained and tested using only those patient belonging to the same cluster. We compared these results with those obtained using a unique classifier for all patients. From our analysis it emerged that the image partition in homogeneous groups can effectively improve the final detection performances.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114743215","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533731
L. Frighetto-Pereira, G. A. Metzner, P. M. A. Marques, M. Nogueira-Barbosa, Foad Oloumi, R. Rangayyan
Vertebral compression fractures (VCFs) present as partial collapses of vertebral bodies and may occur secondary to osteoporosis bone fragility and to metastatic cancer infiltration. The correct diagnosis of nontraumatic VCFs is therefore, fundamental for correct treatment. We aimed to classify VCFs using T1-weighted magnetic resonance images (MRI) of the lumbar spine acquired in the sagittal plane. Our study group comprised 63 patients (38 women and 25 men). From these patients 102 lumbar VCFs (53 benign and 49 malignant) and 89 normal vertebral bodies were manually segmented. The principal axis of each vertebral body region of interest was identified using moments. Statistical features of height and width measured perpendicular and parallel to the principal axis were computed. The k-nearest-neighbor method, a neural network with radial basis functions, and the naïve Bayes classifier were used with feature selection for classification. Areas under the receiver operating characteristic curve of 0.96 in the recognition of VCFs as compared with normal vertebral bodies and 0.73 for the classification of benign versus malignant VCFs were obtained. The proposed methods are promising for the recognition of VCFs, but additional features are needed to improve the classification of benign versus malignant VCFs.
{"title":"Recognition of vertebral compression fractures in magnetic resonance images using statistics of height and width","authors":"L. Frighetto-Pereira, G. A. Metzner, P. M. A. Marques, M. Nogueira-Barbosa, Foad Oloumi, R. Rangayyan","doi":"10.1109/MeMeA.2016.7533731","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533731","url":null,"abstract":"Vertebral compression fractures (VCFs) present as partial collapses of vertebral bodies and may occur secondary to osteoporosis bone fragility and to metastatic cancer infiltration. The correct diagnosis of nontraumatic VCFs is therefore, fundamental for correct treatment. We aimed to classify VCFs using T1-weighted magnetic resonance images (MRI) of the lumbar spine acquired in the sagittal plane. Our study group comprised 63 patients (38 women and 25 men). From these patients 102 lumbar VCFs (53 benign and 49 malignant) and 89 normal vertebral bodies were manually segmented. The principal axis of each vertebral body region of interest was identified using moments. Statistical features of height and width measured perpendicular and parallel to the principal axis were computed. The k-nearest-neighbor method, a neural network with radial basis functions, and the naïve Bayes classifier were used with feature selection for classification. Areas under the receiver operating characteristic curve of 0.96 in the recognition of VCFs as compared with normal vertebral bodies and 0.73 for the classification of benign versus malignant VCFs were obtained. The proposed methods are promising for the recognition of VCFs, but additional features are needed to improve the classification of benign versus malignant VCFs.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"2008 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128897457","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533795
S. Martinez, O. Kuzmicheva, A. Gräser
This paper presents a study on overground non-pathological gait, focusing on hip and knee joint trajectories in sagittal plane. The objects of study are some characteristic points of the joint curves (including the extrema) and their relation to gait parameters, namely normalized walking speed, cadence and normalized step length. The main objective is to predict the spatio-temporal values of these points depending on given gait parameters. To this end, a study with 18 healthy subjects was conducted, where they were asked to walk as comfortable as possible whilst following different tasks, namely walking with desired and given cadence, step length and speed. The data was processed and fed to artificial neural networks to obtain an algorithm able to predict the characteristic points. Specifics of the study protocol and data processing are presented, as well as the prediction results.
{"title":"Prediction of characteristic points of hip and knee joint trajectories during overground walking using IMUs and Artificial Neural Networks","authors":"S. Martinez, O. Kuzmicheva, A. Gräser","doi":"10.1109/MeMeA.2016.7533795","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533795","url":null,"abstract":"This paper presents a study on overground non-pathological gait, focusing on hip and knee joint trajectories in sagittal plane. The objects of study are some characteristic points of the joint curves (including the extrema) and their relation to gait parameters, namely normalized walking speed, cadence and normalized step length. The main objective is to predict the spatio-temporal values of these points depending on given gait parameters. To this end, a study with 18 healthy subjects was conducted, where they were asked to walk as comfortable as possible whilst following different tasks, namely walking with desired and given cadence, step length and speed. The data was processed and fed to artificial neural networks to obtain an algorithm able to predict the characteristic points. Specifics of the study protocol and data processing are presented, as well as the prediction results.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133864195","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533789
S. Karthik, M. Sivaprakasam, J. Joseph, S. Preejith
We study the potential of reflectance photoplethysmography (PPG) in monitoring free flaps for arterial and venous thrombosis in post-surgical scenarios. Circulatory disruptions due to thrombosis were simulated using limb ischemia method on 30 volunteers. Arterial and venous occlusions were conducted in this study. The variation in blood flow in the region of interest was captured by a custom built sensor and data acquisition system using dual wavelength reflectance photoplethysmography. The main chromophores in blood, oxygenated and reduced hemoglobin, showed good variation to visible - near infrared wavelengths with concentration and volume changes. Sensitivity of the prototype device in detecting arterial and venous circulation disruptions was evaluated at various different threshold levels of signal parameters. The device showed strong capability to accurately detect circulatory disruptions and has potential in post-surgical monitoring of free flaps.
{"title":"A reflectance photoplethysmography based device to detect circulatory disruptions","authors":"S. Karthik, M. Sivaprakasam, J. Joseph, S. Preejith","doi":"10.1109/MeMeA.2016.7533789","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533789","url":null,"abstract":"We study the potential of reflectance photoplethysmography (PPG) in monitoring free flaps for arterial and venous thrombosis in post-surgical scenarios. Circulatory disruptions due to thrombosis were simulated using limb ischemia method on 30 volunteers. Arterial and venous occlusions were conducted in this study. The variation in blood flow in the region of interest was captured by a custom built sensor and data acquisition system using dual wavelength reflectance photoplethysmography. The main chromophores in blood, oxygenated and reduced hemoglobin, showed good variation to visible - near infrared wavelengths with concentration and volume changes. Sensitivity of the prototype device in detecting arterial and venous circulation disruptions was evaluated at various different threshold levels of signal parameters. The device showed strong capability to accurately detect circulatory disruptions and has potential in post-surgical monitoring of free flaps.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132459803","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533776
J. Bai, S. Mohanasankar, V. Kumar
A method for determining the concentration of hemoglobin in arterial blood, non invasively, is explored in this paper. A permanent magnet is placed just above the radial artery of a person whose hemoglobin concentration is to be ascertained. The flux produced by the permanent magnet (that links with the blood flow in the radial artery) is sensed to obtain a signal called magnetic plethysmogram (MPG). In this paper, an analytical model for a magnetic plethysmogram is derived. Using the proposed analytical model, a method of estimation of the concentration of hemoglobin in arterial blood is derived. The proposed method is then validated through a limited clinical study. The results of the clinical study establish the viability of measuring hemoglobin concentration, noninvasively, using magnetic plethysmogram.
{"title":"Non-invasive measurement of hemoglobin concentration using magnetic plethysmo gram","authors":"J. Bai, S. Mohanasankar, V. Kumar","doi":"10.1109/MeMeA.2016.7533776","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533776","url":null,"abstract":"A method for determining the concentration of hemoglobin in arterial blood, non invasively, is explored in this paper. A permanent magnet is placed just above the radial artery of a person whose hemoglobin concentration is to be ascertained. The flux produced by the permanent magnet (that links with the blood flow in the radial artery) is sensed to obtain a signal called magnetic plethysmogram (MPG). In this paper, an analytical model for a magnetic plethysmogram is derived. Using the proposed analytical model, a method of estimation of the concentration of hemoglobin in arterial blood is derived. The proposed method is then validated through a limited clinical study. The results of the clinical study establish the viability of measuring hemoglobin concentration, noninvasively, using magnetic plethysmogram.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132537950","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533746
L. Gastaldi, V. Rosso, V. Gabola, V. Agostini, M. M. L. Frutos, M. Knaflitz, Ryo Takeda, S. Tadano
Magneto-Inertial Measurement Units (MIMUs) are gathering an increasing consensus in human motion analysis. However, applications such as clinical gait analysis require reliable, repeatable and accurate measurements of gait parameters up to a level that it is not easily achievable with MIMUs. We pointed out some specific technical challenges that we encountered in the use of the MIMUs-based H-gait system, pertaining to 1) calibration procedure and 2) high dispersion of ankle joint kinematic curves. We described how we solved these issues: 1) shifting from a manual to a semi-automatic calibration procedure and 2) obtaining an optimal MIMUs positioning on the foot. Joint kinematic results were validated against those acquired with a standard electromechanical system (STEP32).
{"title":"Technical challenges using magneto-inertial sensors for gait analysis","authors":"L. Gastaldi, V. Rosso, V. Gabola, V. Agostini, M. M. L. Frutos, M. Knaflitz, Ryo Takeda, S. Tadano","doi":"10.1109/MeMeA.2016.7533746","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533746","url":null,"abstract":"Magneto-Inertial Measurement Units (MIMUs) are gathering an increasing consensus in human motion analysis. However, applications such as clinical gait analysis require reliable, repeatable and accurate measurements of gait parameters up to a level that it is not easily achievable with MIMUs. We pointed out some specific technical challenges that we encountered in the use of the MIMUs-based H-gait system, pertaining to 1) calibration procedure and 2) high dispersion of ankle joint kinematic curves. We described how we solved these issues: 1) shifting from a manual to a semi-automatic calibration procedure and 2) obtaining an optimal MIMUs positioning on the foot. Joint kinematic results were validated against those acquired with a standard electromechanical system (STEP32).","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121337818","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533773
I. Melis, M. P. Penna, Marta Murru, A. Pontis, M. Agus, S. Angioni
Endometriosis is a chronic disease that affects women of reproductive age. Chronic pelvic pain, dysmenorrhea, and dyspareunia are its main symptoms; pain alters the quality of life of the patient and affects her health. Since pain is a highly subjective experience, the purpose of this study is to assess the sensory component of pain perception in endometriosis, alongside the affective-emotional and cognitive aspects. These aspects were linked with anamnestic data, anxiety, and depression. We administered appropriate instruments in order to assess these dimensions (QUID - Italian Pain Questionnaire, Biberoglu's Scale, and the HADS Scale), and we evaluated their relationships.
{"title":"Multidimensional assessment of pain in women with endometriosis: Preliminary results of the experience in Cagliari","authors":"I. Melis, M. P. Penna, Marta Murru, A. Pontis, M. Agus, S. Angioni","doi":"10.1109/MeMeA.2016.7533773","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533773","url":null,"abstract":"Endometriosis is a chronic disease that affects women of reproductive age. Chronic pelvic pain, dysmenorrhea, and dyspareunia are its main symptoms; pain alters the quality of life of the patient and affects her health. Since pain is a highly subjective experience, the purpose of this study is to assess the sensory component of pain perception in endometriosis, alongside the affective-emotional and cognitive aspects. These aspects were linked with anamnestic data, anxiety, and depression. We administered appropriate instruments in order to assess these dimensions (QUID - Italian Pain Questionnaire, Biberoglu's Scale, and the HADS Scale), and we evaluated their relationships.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130913471","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533765
M. Parvis, S. Grassini, E. Angelini, Pietro Scattareggia
Spinal diseases and spine curvature disorders often need swimming rehabilitation to recover as much as function as possible. During swimming sessions the trainer is able of discriminating by sight large movement problems connected to the back pain, but an automatic intelligent system capable to assess the presence of movement problems could help the swimmer doing therapy by him/herself. This paper describes a possible easy-to-use solution, which is based on four small inertial systems to be installed on wrists and ankles in order to follow the movements of legs and arms. The inertial systems are composed of a commercial miniaturized Inertial Measurement Unit and by a Teensyduino board, which is able to store up to ten thousand inertial samples enabling recording the swimming for about four minutes. Angular velocity and acceleration recorded by the inertial systems are then transferred to a computer via an USB cable and processed to obtain an indication of the swimming asymmetry. The paper describes the design and realization of the acquisition units and the first results obtained by some patients during their therapy.
{"title":"Swimming symmetry assessment via multiple inertial measurements","authors":"M. Parvis, S. Grassini, E. Angelini, Pietro Scattareggia","doi":"10.1109/MeMeA.2016.7533765","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533765","url":null,"abstract":"Spinal diseases and spine curvature disorders often need swimming rehabilitation to recover as much as function as possible. During swimming sessions the trainer is able of discriminating by sight large movement problems connected to the back pain, but an automatic intelligent system capable to assess the presence of movement problems could help the swimmer doing therapy by him/herself. This paper describes a possible easy-to-use solution, which is based on four small inertial systems to be installed on wrists and ankles in order to follow the movements of legs and arms. The inertial systems are composed of a commercial miniaturized Inertial Measurement Unit and by a Teensyduino board, which is able to store up to ten thousand inertial samples enabling recording the swimming for about four minutes. Angular velocity and acceleration recorded by the inertial systems are then transferred to a computer via an USB cable and processed to obtain an indication of the swimming asymmetry. The paper describes the design and realization of the acquisition units and the first results obtained by some patients during their therapy.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121906387","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 : 2016-05-15DOI: 10.1109/MEMEA.2016.7533791
E. Cinotti, J. Perrot, B. Labeille, F. Cambazard, R. Vie, A. Delalleau, L. Tognetti, P. Rubegni
Videodermoscopy has been used for the diagnosis of skin cancers and could be of potential interest to assess the quality of the skin in the cosmetic field, especially for the evaluation of skin color and xerosis. We evaluated whether it is possible to observe a variation of skin erythema, yellowness, pigmentation, color variance and xerosis induced by the season effect and the evaluated body site by using a new ultra-high definition videodermoscope. This videodermoscope provides images independent from the external lightening and reproducible. Videodermoscopy images were acquired at three body sites (photo-exposed forearm and face and photo-protected arm) of 149 elderly healthy volunteers. 79 subjects were evaluated in March and 70 subjects were evaluated in November. We found a difference in erythema, pigmentation, xerosis and yellowness in the two groups of subjects evaluated before and after the summer. As expected, erythema, pigmentation and xerosis increased and yellowness decreased after the summer. Some differences of these parameters were found in the three body sites independently from sun exposure. Videodermoscopy can provide quantitative data about both skin color and xerosis and in the future it could be used to evaluate different cosmetics and aesthetical procedures.
{"title":"Season and anatomic site effect on skin color and xerosis quantified using an ultra-high definition videodermoscope","authors":"E. Cinotti, J. Perrot, B. Labeille, F. Cambazard, R. Vie, A. Delalleau, L. Tognetti, P. Rubegni","doi":"10.1109/MEMEA.2016.7533791","DOIUrl":"https://doi.org/10.1109/MEMEA.2016.7533791","url":null,"abstract":"Videodermoscopy has been used for the diagnosis of skin cancers and could be of potential interest to assess the quality of the skin in the cosmetic field, especially for the evaluation of skin color and xerosis. We evaluated whether it is possible to observe a variation of skin erythema, yellowness, pigmentation, color variance and xerosis induced by the season effect and the evaluated body site by using a new ultra-high definition videodermoscope. This videodermoscope provides images independent from the external lightening and reproducible. Videodermoscopy images were acquired at three body sites (photo-exposed forearm and face and photo-protected arm) of 149 elderly healthy volunteers. 79 subjects were evaluated in March and 70 subjects were evaluated in November. We found a difference in erythema, pigmentation, xerosis and yellowness in the two groups of subjects evaluated before and after the summer. As expected, erythema, pigmentation and xerosis increased and yellowness decreased after the summer. Some differences of these parameters were found in the three body sites independently from sun exposure. Videodermoscopy can provide quantitative data about both skin color and xerosis and in the future it could be used to evaluate different cosmetics and aesthetical procedures.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123458993","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 : 2016-05-15DOI: 10.1109/MeMeA.2016.7533703
Alberto López, Francisco Javier Ferrero Martín, M. Valledor, Juan Carlos Campo Rodríguez, O. Postolache
The eye acts as a dipole between the cornea (positive potential) and the retina (negative potential) which causes an electric field around the eyeball. Therefore, when humans make saccadic eye movements, they generate signals relative to this potential called electrooculography (EOG) signals. These signals can be measured by placing electrodes near the eye. Different electrode configurations can be employed to acquire the EOG signals. The properties of these signals change depending on the number and placement of the electrodes. Therefore, this paper presents a comparative study of electrode placement used to measure EOG signals. In order to support this study a low-cost signal acquisition hardware was developed. It enables the comparison of different electrode placements while showing the particularities of each one. The aim of this study is to analyse which electrode configuration could be best for medical applications.
{"title":"A study on electrode placement in EOG systems for medical applications","authors":"Alberto López, Francisco Javier Ferrero Martín, M. Valledor, Juan Carlos Campo Rodríguez, O. Postolache","doi":"10.1109/MeMeA.2016.7533703","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533703","url":null,"abstract":"The eye acts as a dipole between the cornea (positive potential) and the retina (negative potential) which causes an electric field around the eyeball. Therefore, when humans make saccadic eye movements, they generate signals relative to this potential called electrooculography (EOG) signals. These signals can be measured by placing electrodes near the eye. Different electrode configurations can be employed to acquire the EOG signals. The properties of these signals change depending on the number and placement of the electrodes. Therefore, this paper presents a comparative study of electrode placement used to measure EOG signals. In order to support this study a low-cost signal acquisition hardware was developed. It enables the comparison of different electrode placements while showing the particularities of each one. The aim of this study is to analyse which electrode configuration could be best for medical applications.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122943151","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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