Pub Date : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864511
Liang Xiaofei, Fan Fan, Niu Haijun, Fan Yubo
The objective of this study was to observe the age-related changes of sulfated glycosaminoglycan (sGAG) content and surface roughness of hip joint cartilage of elderly people based on Equilibrium Partitioning of an Ionic Contrast Agent (EPIC) Micro-CT. 35 human hip cartilage-bone samples were prepared from hip-fracture patients whose age were from 50 to 100 years old and divided into 5 groups (10 years as an age group). They were first immersed in 20% concentration of the contrast agent Meglumine Diatrizoate (MD) for 6 hours at 37°C, and scanned by Micro-CT after taken out from the contrast agent. The X-ray mean attenuation and hip joint cartilage surface roughness were calculated. The results showed the X-ray mean attenuation of the entire hip joint cartilage increased about 17.44% from the 50 age group to the 80 age group (from 1294.61±97.77HU to 1520.39±184.56HU), but it decreased about 6.43% in the 90 age group compared to the 80 age group (from 1520.39±184.56HU to 1422.55±106.37HU). Moreover, the X-ray mean attenuations of the superficial layer, middle layer and radical layer of cartilage declined successively in the different age groups. Regarding of the superficial layer and middle layer from the 50 age group to the 80 age group, they rose about 31.21 % and 43.02% respectively (from 1472.40±138.96HU to 1931.99±199.69HU and 1271.83±58.36HU to 1819.07±213.55HU), and also reduced 4.64% and 6.03% separately in the 90 age group (from 1931.99±199.69HU to 1798.12±153.32HU, and 1819.07±213.55HU to 1653.22±169.46HU), while the radical layer showed no significant change along with age increase. The hip joint cartilage surface roughness changes only 5.31% with age increase (from 13.64±5.17μm to 14.36±5.21μm).
{"title":"The observation of hip joint cartilage of elderly people based on EPIC Micro-CT","authors":"Liang Xiaofei, Fan Fan, Niu Haijun, Fan Yubo","doi":"10.1109/ICMIPE.2013.6864511","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864511","url":null,"abstract":"The objective of this study was to observe the age-related changes of sulfated glycosaminoglycan (sGAG) content and surface roughness of hip joint cartilage of elderly people based on Equilibrium Partitioning of an Ionic Contrast Agent (EPIC) Micro-CT. 35 human hip cartilage-bone samples were prepared from hip-fracture patients whose age were from 50 to 100 years old and divided into 5 groups (10 years as an age group). They were first immersed in 20% concentration of the contrast agent Meglumine Diatrizoate (MD) for 6 hours at 37°C, and scanned by Micro-CT after taken out from the contrast agent. The X-ray mean attenuation and hip joint cartilage surface roughness were calculated. The results showed the X-ray mean attenuation of the entire hip joint cartilage increased about 17.44% from the 50 age group to the 80 age group (from 1294.61±97.77HU to 1520.39±184.56HU), but it decreased about 6.43% in the 90 age group compared to the 80 age group (from 1520.39±184.56HU to 1422.55±106.37HU). Moreover, the X-ray mean attenuations of the superficial layer, middle layer and radical layer of cartilage declined successively in the different age groups. Regarding of the superficial layer and middle layer from the 50 age group to the 80 age group, they rose about 31.21 % and 43.02% respectively (from 1472.40±138.96HU to 1931.99±199.69HU and 1271.83±58.36HU to 1819.07±213.55HU), and also reduced 4.64% and 6.03% separately in the 90 age group (from 1931.99±199.69HU to 1798.12±153.32HU, and 1819.07±213.55HU to 1653.22±169.46HU), while the radical layer showed no significant change along with age increase. The hip joint cartilage surface roughness changes only 5.31% with age increase (from 13.64±5.17μm to 14.36±5.21μm).","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"1046 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133843703","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864553
Shaosen Huang, Yong Zhao, Cheng Hu, Binjie Qin
Nonnegative Matrix Factorization (NMF) has been a useful tool to solve the spectral unmixing for fluorescence imaging, which yields a set of constituent spectra, i.e., endmembers, and their corresponding fractional abundances. As observed from the spatial distribution of fluorescence data, target fluorophores are sparse and localized at certain regions while background fluorescence (including autofluorescence) are non-sparse and diffusive over large areas. Based on the different sparsity characteristics of abundances between target fluorophores and background fluorescence, we propose a NMF algorithm based on the target-to-background contrast with entire abundances being divided into a hierarchy of target fluorophores and a hierarchy of background. With the clear distinction between abundances of targets and background fluorescence in the iterative updates of NMF, appropriate sparseness constraint can be easily introduced into the corresponding target hierarchy without interfering with the other background hierarchy. Experimental results based on synthetic and real fluorescence data show the better performances of the proposed algorithm with respect to other state-of-the-art methods.
{"title":"Nonnegative matrix factorization using target-to-background contrast for fluorescence unmixing","authors":"Shaosen Huang, Yong Zhao, Cheng Hu, Binjie Qin","doi":"10.1109/ICMIPE.2013.6864553","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864553","url":null,"abstract":"Nonnegative Matrix Factorization (NMF) has been a useful tool to solve the spectral unmixing for fluorescence imaging, which yields a set of constituent spectra, i.e., endmembers, and their corresponding fractional abundances. As observed from the spatial distribution of fluorescence data, target fluorophores are sparse and localized at certain regions while background fluorescence (including autofluorescence) are non-sparse and diffusive over large areas. Based on the different sparsity characteristics of abundances between target fluorophores and background fluorescence, we propose a NMF algorithm based on the target-to-background contrast with entire abundances being divided into a hierarchy of target fluorophores and a hierarchy of background. With the clear distinction between abundances of targets and background fluorescence in the iterative updates of NMF, appropriate sparseness constraint can be easily introduced into the corresponding target hierarchy without interfering with the other background hierarchy. Experimental results based on synthetic and real fluorescence data show the better performances of the proposed algorithm with respect to other state-of-the-art methods.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124420671","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864539
Guo Bin, Liu Bo, Zhou Fugen
FDK reconstruction algorithm is the most widely used for Cone Beam CT imaging system due to its simplicity and fast implementation. However, if misalignments exist in the detector, the original FDK reconstruction algorithm will result in deteriorated reconstruction quality because of the wrong correspondence of the voxels from the object and the pixels from the projection. One way is to apply rotation-based interpolation for each projection, which not only will cause blurring of the details due to the effect of interpolation but also is very time-consuming. In back-projection based reconstruction, the key factor is to correctly relate the voxels from the object and the pixels from the projections. Based on this point of view, we propose a method that will correctly find the correspondence of the voxels and pixels. With this method, reconstruction result can be obtained with good accuracy if all the misaligned parameters of the detector are known. And also, detail information can be better preserved compared with the rotation-based interpolation method. In the validation period, a simulation program of Cone-Beam CT was developed. In this program, all misaligned parameters of detector are able to be set. And the simulated result proves that our method is efficient and feasible although it suffers a little deterioration, and can further be used in online calibration of CBCT.
{"title":"A modified FDK with misaligned parameters of flat-panel detector in Cone-Beam CT","authors":"Guo Bin, Liu Bo, Zhou Fugen","doi":"10.1109/ICMIPE.2013.6864539","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864539","url":null,"abstract":"FDK reconstruction algorithm is the most widely used for Cone Beam CT imaging system due to its simplicity and fast implementation. However, if misalignments exist in the detector, the original FDK reconstruction algorithm will result in deteriorated reconstruction quality because of the wrong correspondence of the voxels from the object and the pixels from the projection. One way is to apply rotation-based interpolation for each projection, which not only will cause blurring of the details due to the effect of interpolation but also is very time-consuming. In back-projection based reconstruction, the key factor is to correctly relate the voxels from the object and the pixels from the projections. Based on this point of view, we propose a method that will correctly find the correspondence of the voxels and pixels. With this method, reconstruction result can be obtained with good accuracy if all the misaligned parameters of the detector are known. And also, detail information can be better preserved compared with the rotation-based interpolation method. In the validation period, a simulation program of Cone-Beam CT was developed. In this program, all misaligned parameters of detector are able to be set. And the simulated result proves that our method is efficient and feasible although it suffers a little deterioration, and can further be used in online calibration of CBCT.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128468738","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864500
Xiaozhao Chen, Yu Chen, Baolin Mao, Xin Xiong, Nan Bao, Yan Kang
CT-guided interventions have been widely used in lung biopsy procedures to minimize invasion and to improve biopsy accuracy. The basic mathematical statement of the point-based registration problem remains the same in most applications, whereas there are variations on the size and shape of the fiducial markers. In this paper, we measured registration error FLEp and TRE respectively using two types of fiducial markers, ectrocardiograph electrode and steel bead. The TRE using ECG electrodes is lower than using steel beads. These experimental findings of registration accuracy indicate that ECG electrodes as fiducial markers can be accepted in the lung biopsy.
{"title":"CT-guided lung biopsy: Assessment of fiducials registration accuracy","authors":"Xiaozhao Chen, Yu Chen, Baolin Mao, Xin Xiong, Nan Bao, Yan Kang","doi":"10.1109/ICMIPE.2013.6864500","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864500","url":null,"abstract":"CT-guided interventions have been widely used in lung biopsy procedures to minimize invasion and to improve biopsy accuracy. The basic mathematical statement of the point-based registration problem remains the same in most applications, whereas there are variations on the size and shape of the fiducial markers. In this paper, we measured registration error FLEp and TRE respectively using two types of fiducial markers, ectrocardiograph electrode and steel bead. The TRE using ECG electrodes is lower than using steel beads. These experimental findings of registration accuracy indicate that ECG electrodes as fiducial markers can be accepted in the lung biopsy.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117087844","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864497
Baolin Mao, Dayu Xiao, Xin Xiong, Xiaozhao Chen, Wei Zhang, Yan Kang
Ring artifacts are among of the most common artifacts in cone beam computed tomography (CT). High resolution images are often disturbed by these artifacts. In this paper, a ring artifacts reduction method is proposed based on cone beam projection images. CUDA technique is used to accelerate the method. The performance of the proposed algorithm is evaluated using real cone beam CT images. Experiment results demonstrate that the proposed technique effectively eliminates the ring artifactsand has superior calculation speed using CUDA than the calculation speed of CPU.
{"title":"Accelerating ring artifacts reduction for cone beam CT based on projection data using CUDA","authors":"Baolin Mao, Dayu Xiao, Xin Xiong, Xiaozhao Chen, Wei Zhang, Yan Kang","doi":"10.1109/ICMIPE.2013.6864497","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864497","url":null,"abstract":"Ring artifacts are among of the most common artifacts in cone beam computed tomography (CT). High resolution images are often disturbed by these artifacts. In this paper, a ring artifacts reduction method is proposed based on cone beam projection images. CUDA technique is used to accelerate the method. The performance of the proposed algorithm is evaluated using real cone beam CT images. Experiment results demonstrate that the proposed technique effectively eliminates the ring artifactsand has superior calculation speed using CUDA than the calculation speed of CPU.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822439","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864524
Wang Fei, Yang Wenchao, Liu Yong, L. Jiajia, Ma Jingfeng, Bao Shanglian, Gao Song
Purpose: To identify the regions responding to the stereoscopic motion induced by binocular disparity and investigate the relationship between the response intensity of these regions and speeds of spatial motion. Methods: The stereoscopic stimulus applied Random Dot Stereogram (RDS) distributed as checkerboard and a series of continuous disparities formed a dynamic stereoscopic stimulus. Observer needed to watch some static stimuli and dynamic stimuli moving in depth direction. The speeds of dynamic stimulus consisted of three levels: 0.315 degree/s, 0.63 degree/s, 1.26 degree/s. The functional Magnetic Resonance Imaging (fMRI) was used to sample the Blood Oxygen Level-Dependent (BOLD) signals and identify the regions sensitive to stereoscopic motion. Results: The dynamic stereoscopic stimulus can activate the hMT/V5 in a stronger degree than static stereoscopic stimulus. Besides, the signal intensity increased with the speed. The most reasonable explanation is that a large number of neurons sensitive to spatial motion exist in this region. Conclusion: The study reveals preliminarily that the human cortex hMT/V5 processes the information of spatial motion.
{"title":"V5/hMT responds to the stereoscopic motion induced by binocular disparity: A preliminary fMRI study","authors":"Wang Fei, Yang Wenchao, Liu Yong, L. Jiajia, Ma Jingfeng, Bao Shanglian, Gao Song","doi":"10.1109/ICMIPE.2013.6864524","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864524","url":null,"abstract":"Purpose: To identify the regions responding to the stereoscopic motion induced by binocular disparity and investigate the relationship between the response intensity of these regions and speeds of spatial motion. Methods: The stereoscopic stimulus applied Random Dot Stereogram (RDS) distributed as checkerboard and a series of continuous disparities formed a dynamic stereoscopic stimulus. Observer needed to watch some static stimuli and dynamic stimuli moving in depth direction. The speeds of dynamic stimulus consisted of three levels: 0.315 degree/s, 0.63 degree/s, 1.26 degree/s. The functional Magnetic Resonance Imaging (fMRI) was used to sample the Blood Oxygen Level-Dependent (BOLD) signals and identify the regions sensitive to stereoscopic motion. Results: The dynamic stereoscopic stimulus can activate the hMT/V5 in a stronger degree than static stereoscopic stimulus. Besides, the signal intensity increased with the speed. The most reasonable explanation is that a large number of neurons sensitive to spatial motion exist in this region. Conclusion: The study reveals preliminarily that the human cortex hMT/V5 processes the information of spatial motion.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114175510","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864555
Haiyang Li, Weiguo Cao, Siyuan Wang, Shirui Li, Hua Li
Grating phase-contrast CT obtains differential phase, which is different from conventional CT (absorb-contrast CT). How to retrieve phase of object becomes a new topic. Nowadays, many algorithms have appeared to retrieve and reconstruct materials' phase information. We design a new filter to retrieve phase but not increase the dose of X-ray. The result of phase retrieved shows the validity and correctness of the filter.
{"title":"Phase retrieval for grating phase-contrast CT","authors":"Haiyang Li, Weiguo Cao, Siyuan Wang, Shirui Li, Hua Li","doi":"10.1109/ICMIPE.2013.6864555","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864555","url":null,"abstract":"Grating phase-contrast CT obtains differential phase, which is different from conventional CT (absorb-contrast CT). How to retrieve phase of object becomes a new topic. Nowadays, many algorithms have appeared to retrieve and reconstruct materials' phase information. We design a new filter to retrieve phase but not increase the dose of X-ray. The result of phase retrieved shows the validity and correctness of the filter.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126168613","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864512
Quanhai Fu, Chaojie Li, Yaofang Hou
Currently, dental CBCT(Cone-Beam Computed Tomography) is wildly used in the tooth implantation, maxillofacial surgery and the treatment of temporomandibular joint disorders. The three-dimensional images of Dental CBCT are reconstructed based on the projection images, which are obtained at each degree of 360°. The projected image should have a precise correspondence with the angle of rotation of arm. If vibration occurs during the rotation, artifacts will be caused from reconstruction, thus affecting the image quality. It has a very important significance on the image reconstruction if vibration information of CBCT arm can be detected and evaluated. This paper presented a vibration measuring device based 3D accelerometer, which can measure and evaluate vibration of CBCT during operation. With this device, vibration information can be sensed by 3D accelerometer. The analog signals are sampled by Microprocessor with internal ADC converter. Then, all data are sent to PC via wireless communication way. Software written by MATLAB will acquire, display, save and analyze data from measurement device, which makes it possible that evaluates vibration information from CBCT.
{"title":"Vibration measurement of dental CBCT based on 3D accelerometer","authors":"Quanhai Fu, Chaojie Li, Yaofang Hou","doi":"10.1109/ICMIPE.2013.6864512","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864512","url":null,"abstract":"Currently, dental CBCT(Cone-Beam Computed Tomography) is wildly used in the tooth implantation, maxillofacial surgery and the treatment of temporomandibular joint disorders. The three-dimensional images of Dental CBCT are reconstructed based on the projection images, which are obtained at each degree of 360°. The projected image should have a precise correspondence with the angle of rotation of arm. If vibration occurs during the rotation, artifacts will be caused from reconstruction, thus affecting the image quality. It has a very important significance on the image reconstruction if vibration information of CBCT arm can be detected and evaluated. This paper presented a vibration measuring device based 3D accelerometer, which can measure and evaluate vibration of CBCT during operation. With this device, vibration information can be sensed by 3D accelerometer. The analog signals are sampled by Microprocessor with internal ADC converter. Then, all data are sent to PC via wireless communication way. Software written by MATLAB will acquire, display, save and analyze data from measurement device, which makes it possible that evaluates vibration information from CBCT.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"398 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756022","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864537
Lei Wang, Xin Gao, Ran Zhang, W. Xia
In image-guided intervention, 2D/3D medical image registration is crucial to assist the clinician to locate precisely the lesions of the patient, which involves many aspects, such as similarity measure. In this paper, two similarity measures, distance coefficient mutual information (DCMI) and distance weighted mutual information (DWMI), were compared for 2D/3D rigid registrations by applying them to porcine skull phantom datasets from the Medical University Vienna. The results showed that DWMI was more accurate than DCMI with lower by 5.25% mean of mTRE and higher by 5.06% success rate but greater 7.74% average iterations. This indicates that the two similarity measures, in which space distance information was used to restrict mutual information in different ways, have no dramatically difference in precision of 2D/3D registration.
{"title":"A comparison of two novel similarity measures based on mutual information in 2D/3D image registration","authors":"Lei Wang, Xin Gao, Ran Zhang, W. Xia","doi":"10.1109/ICMIPE.2013.6864537","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864537","url":null,"abstract":"In image-guided intervention, 2D/3D medical image registration is crucial to assist the clinician to locate precisely the lesions of the patient, which involves many aspects, such as similarity measure. In this paper, two similarity measures, distance coefficient mutual information (DCMI) and distance weighted mutual information (DWMI), were compared for 2D/3D rigid registrations by applying them to porcine skull phantom datasets from the Medical University Vienna. The results showed that DWMI was more accurate than DCMI with lower by 5.25% mean of mTRE and higher by 5.06% success rate but greater 7.74% average iterations. This indicates that the two similarity measures, in which space distance information was used to restrict mutual information in different ways, have no dramatically difference in precision of 2D/3D registration.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123510130","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 : 2013-10-01DOI: 10.1109/ICMIPE.2013.6864501
Baolin Mao, Dayu Xiao, Xin Xiong, Xiaozhao Chen, Wei Zhang, Yan Kang
The purpose of this paper is to improve the quality of low dose Computed Tomography (CT) images. Low dose artifacts are the Gaussian noises superimposed on the CT images and are often caused by insufficient calibrated detector and photon starvation. A noise reduction method via three dimensional total variation using Compute Unified Device Architecture (CUDA) is proposed on the three dimensional image. This method can also be employed for low dose noise removal of the two dimensional CT images by decreasing a total variation dimension processing technique. The performance of the proposed algorithm has been tested by using quantitative measures. For quantitative analysis, the quality assessment parameter Peak-signal-to-noise-ratio (PSNR) is used in this paper. Both simulation and real experiment results show that the proposed technique increases the image quality and has high calculation speed.
{"title":"Denoising low dose CT images via 3D total variation using CUDA","authors":"Baolin Mao, Dayu Xiao, Xin Xiong, Xiaozhao Chen, Wei Zhang, Yan Kang","doi":"10.1109/ICMIPE.2013.6864501","DOIUrl":"https://doi.org/10.1109/ICMIPE.2013.6864501","url":null,"abstract":"The purpose of this paper is to improve the quality of low dose Computed Tomography (CT) images. Low dose artifacts are the Gaussian noises superimposed on the CT images and are often caused by insufficient calibrated detector and photon starvation. A noise reduction method via three dimensional total variation using Compute Unified Device Architecture (CUDA) is proposed on the three dimensional image. This method can also be employed for low dose noise removal of the two dimensional CT images by decreasing a total variation dimension processing technique. The performance of the proposed algorithm has been tested by using quantitative measures. For quantitative analysis, the quality assessment parameter Peak-signal-to-noise-ratio (PSNR) is used in this paper. Both simulation and real experiment results show that the proposed technique increases the image quality and has high calculation speed.","PeriodicalId":135461,"journal":{"name":"2013 IEEE International Conference on Medical Imaging Physics and Engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122067038","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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