2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)最新文献_第4页

Development and assessment of statistical iterative image reconstruction for CT on a small animal SPECT/CT dual-modality system 基于小动物SPECT/CT双模系统的CT统计迭代图像重建方法的开发与评价

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551776

T. Dai, Xiao Deng, C. Ionita, Qingyang Wei, Tianyu Ma, Yaqiang Liu, D. Bednarek, S. Rudin, R. Yao

{"title":"Development and assessment of statistical iterative image reconstruction for CT on a small animal SPECT/CT dual-modality system","authors":"T. Dai, Xiao Deng, C. Ionita, Qingyang Wei, Tianyu Ma, Yaqiang Liu, D. Bednarek, S. Rudin, R. Yao","doi":"10.1109/NSSMIC.2012.6551776","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551776","url":null,"abstract":"We developed a statistical iterative CT image reconstruction software for a newly constructed high-resolution small animal SPECT/CT dual-modality system, and assessed its performance at different radiation exposure levels. The objective of this work was to preserve or improve reconstructed image quality at either the same or reduced animal x-ray radiation exposure. The SPECT/CT system used a single detector for both the CT and SPECT modalities that consists of a micro-columnar CsI(TI) phosphor, a light image intensifier (LII) and a CCD sensor. The CT reconstruction software was based on the ordered-subset-convex (OSC) algorithm, and the system matrix was calculated through a ray-driven approach. A self-calibration method was implemented to calculate the offset of the axis of rotation (AOR), an important geometry parameter of the system. An endovascular stent was imaged to evaluate the high resolution performance of the statistical reconstructed image. A sacrificed mouse was scanned at different exposure levels to assess the effect of statistical noise on the image. The mouse studies were reconstructed with both the statistical reconstruction software and a filtered back-projection (FBP) program. The images were assessed and compared by contrast to noise ratio (CNR) in the region of interest. The images yielded by the statistical reconstruction software were artifact free and show superior noise performance to those from FBP reconstruction at different radiation exposure levels. The statistical reconstructed images with reduced exposure showed obviously higher image quality than those from FBP reconstruction at full exposure.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115415457","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}

引用次数: 3

Response evolution of the CMS ECAL and R&D studies for electromagnetic calorimetry at the high-luminosity LHC CMS - ECAL响应演化及高亮度LHC电磁量热研究

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551434

F. Nessi-Tedaldi

引用次数: 6

Respiratory tracking using EDR for list-mode binning in cardiac emission tomography: Comparison with MRI heart motion measurements 在心脏发射断层扫描中使用EDR进行列表模式合并的呼吸跟踪:与MRI心脏运动测量的比较

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551488

A. Konik, P. Dasari, J. M. Mukherjee, Karen L. Johnson, E. Helfenbein, Simon C. Chien, S. Babaeizadeh, L. Shao, J. Dey, M. King

{"title":"Respiratory tracking using EDR for list-mode binning in cardiac emission tomography: Comparison with MRI heart motion measurements","authors":"A. Konik, P. Dasari, J. M. Mukherjee, Karen L. Johnson, E. Helfenbein, Simon C. Chien, S. Babaeizadeh, L. Shao, J. Dey, M. King","doi":"10.1109/NSSMIC.2012.6551488","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551488","url":null,"abstract":"In cardiac emission tomography, the respiratory motion of the heart forms an important source of artifact in the reconstructed images, which can mislead diagnosis. Various methods have been developed to measure the respiratory signal externally (e.g., bellow and visual tracking systems) and estimate the motion of the heart. However, most of these methods tend to be time consuming, costly and require additional effort both from patients and technicians. An alternative to these methods is ECG/EMG derived respiration (EDR), which uses ECG leads already placed on the patient without requiring any additional hardware set-up. In this work, we performed a series of volunteer MRI studies to compare the actual heart motion and EDR signals. Simultaneous to these acquisitions, external motion information from a bellow placed on the abdomen and a visual tracking system (VTS) were also obtained. These external measurements were compared with the \"true\" respiratory heart motion information provided by MRI. Our preliminary work indicated that the EDR-in average-had lower correlation values compared to the other two external methods. However, this must be mainly because of the ECG distortion in the MR magnetic field. As the EDR does not require any additional instrument, it could become a practical respiratory tracking method for cardiac emission tomography provided the issues with body motion are addressed.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116763334","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}

引用次数: 4

OMEGAPIX2: 3D integrated circuit prototype dedicated to the ATLAS pixel detector for the High Luminosity LHC OMEGAPIX2:用于高亮度LHC的ATLAS像素探测器的3D集成电路原型

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551212

J. Genat, O. Le Dortz, A. Lounis, G. Martin-Chassard, J. Tongbong, D. Thienpont

引用次数: 5

Detection of cardiac abnormalities from MRI sequences by using a deformable mesh model 利用可变形网格模型从MRI序列中检测心脏异常

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551921

Felipe M. Parages, J. Brankov

引用次数: 0

High energy gamma-ray imaging using Cherenkov cone detection - A Monte Carlo study with application to a Compton camera system 使用切伦科夫锥探测的高能伽玛射线成像-应用于康普顿照相机系统的蒙特卡罗研究

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551741

Todd E. Peterson, A. Brill, A. Walenta

引用次数: 6

Response of silicon diodes for synchrotron radiation 硅二极管对同步辐射的响应

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551445

I. Anokhin, M. Lerch, M. Petasecca, A. Rosenfeld, O. Zinets

{"title":"Response of silicon diodes for synchrotron radiation","authors":"I. Anokhin, M. Lerch, M. Petasecca, A. Rosenfeld, O. Zinets","doi":"10.1109/NSSMIC.2012.6551445","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551445","url":null,"abstract":"Because of very high intensity and pulsed nature of synchrotron radiation the nonlinear effects in recombination-generation kinetics must be taken into account in the response of silicon diodes under irradiation. Dependences of the charge carrier lifetime and the ambipolar diffusion coefficient on the excess carrier density generated by the synchrotron radiation have been considered. Response of silicon diodes on photons from synchrotron sources with energy 20-100 keV has been calculated using the Shockley-Reed recombination statistics. Diffusion equation with time-dependent generation functions has been solved numerically for various intensity of the photon beam and parameters of diodes (diodes design and characteristics of impurity centers). Optimal choice of parameters of diodes for the short-cut current and the photovoltaic operation mode are discussed. Dependencies of responses on the generation rate can be converted into the dose rate responses of diodes by calculating the energy deposition in silicon. At very high beam intensity (the excess minority carrier density is much larger than the density of the majority charge carriers), the Shockley-Reed recombination model would be invalid and the Auger recombination becomes dominant. To explain experimental data on the dose rate response it is needed to use a correct function of the excess carrier lifetime versus the carrier density.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117129987","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}

引用次数: 0

Comparison of patient doses at different CT scanners with same acquisition protocol 采用相同获取方案的不同CT扫描仪对患者剂量的比较

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551837

L. Balkay, A. Oszhinszki, A. Krizsan

{"title":"Comparison of patient doses at different CT scanners with same acquisition protocol","authors":"L. Balkay, A. Oszhinszki, A. Krizsan","doi":"10.1109/NSSMIC.2012.6551837","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551837","url":null,"abstract":"In the last decade both the number of powerful CT scanners and the number of patient investigations increased with a consequent increase of the patient radiation dose. There are large dose variations (more than 10 fold) among individual CT centers and it remains true if they include the same model of CT scanners. The aim of this study was to compare the patient effective dose (De) during the CT examinations from different manufacturer models presuming the same acquisition protocol and using the imPACT patient organ and effective dose calculator program. The following manufacturers and models were selected in the program: GE (LightSpeed Ultra, LightSpeed 16, LightSpeed Pro 16, LightSpeed VCT), Philips (Brilliance 16, Brilliance 16 Power, Big Bore, Brilliance 64/40) and the Siemens (Emotion 6, Sensation 16, Sensation 16 Straton, Sensation 64, Definition AS). Head and body scans were defined for all cases altering tube voltages, while dose calculations were normalized to 100 mAs X-ray exposure. It was found that in body investigations the calculated De for the GE scans were higher by 20% comparing to Siemens and Philips related values. For the head examinations the differences were larger by almost 55%. We also demonstrated that a power relationship can be found between the De and the tube voltage with the exponent of 3.02±0.14 kV-1 and 2.68±0.14 kV-1 for the body and the head scans respectively. It can be concluded that the patient effective dose could be different in CT examinations using distinct CT scanners but defining the same acquisition protocol. Considering the patient dose, this also means that the scan protocols cannot be transferred between different models without specific investigation.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"55 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120818475","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}

引用次数: 3

The SuperB muon detector, status and perspectives 超级μ子探测器，现状与展望

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551436

M. Andreotti, W. Baldini, M. Benettoni, R. Calabrese, V. Carassiti, G. Cibinetto, A. Cotta, F. Daicorso, C. Dedonato, F. Fabbri, E. Luppi, R. Malaguti, A. Montanari, A. Pietropaolo, M. Posocco, M. Rotondo, V. Santoro, R. Stroili, L. Tomassetti, G. Tellarini, N. Tosi

{"title":"The SuperB muon detector, status and perspectives","authors":"M. Andreotti, W. Baldini, M. Benettoni, R. Calabrese, V. Carassiti, G. Cibinetto, A. Cotta, F. Daicorso, C. Dedonato, F. Fabbri, E. Luppi, R. Malaguti, A. Montanari, A. Pietropaolo, M. Posocco, M. Rotondo, V. Santoro, R. Stroili, L. Tomassetti, G. Tellarini, N. Tosi","doi":"10.1109/NSSMIC.2012.6551436","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551436","url":null,"abstract":"The superB project foresees the construction of a high intensity super-flavor factory at the Cabibbo Lab, in Tor Vergata (near Rome). The experiment, based on a high intensity asymmetric electron-positron collider, and on the related detector, is expected to reach a very high luminosity: 2 × 1036 cm-2s-1, that will allow the high statistic study of rare decays and, possibly, will show evidences of new physics. The Muon Detector plays the fundamental role of identifying (mainly) muons tracks, present in many important decays. In order to cope with the very high particle flux, the detector must provide a very fast response and has to be very robust with respect to radiation damage and aging effects. The adopted technique exploits extruded plastic scintillators as active material, WLS fibers for the light collection and Silicon Photon Multipliers (SiPM) as photo-detectors In this manuscript, a complete description of the designed Muon detector and of all the related studies will be presented. In particular, we will focus on the results of a beam tests performed at Fermilab on a large scale prototype and on radiation tests of the most sensitive parts of the detector.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121048877","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}

引用次数: 0

Efficient 2D filtering for cone-beam VOI reconstruction 锥形光束VOI重建的高效二维滤波

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551549

Yan Xia, A. Maier, F. Dennerlein, H. Hofmann, J. Hornegger

{"title":"Efficient 2D filtering for cone-beam VOI reconstruction","authors":"Yan Xia, A. Maier, F. Dennerlein, H. Hofmann, J. Hornegger","doi":"10.1109/NSSMIC.2012.6551549","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551549","url":null,"abstract":"In some clinical applications, e.g., examination of deployed stents or coils during the intervention, only a small portion of the patient may be of diagnostic interest. For the sake of dose reduction to the patient, it is practicable to deploy a collimator to block radiation dose outside volume of interest (VOl). The resulting truncation, however, particularly in lateral direction, poses a challenge to the conventional reconstruction methods. The Approximated Truncation Robust Algorithm for Computed Tomography (ATRACT) is able to reconstruct images without the use of any explicit extrapolation schemes, even for highly truncated data. It is based on a decomposition of the standard ramp-filter into a local and a non-local filtering step, where the local step coincides with the two-dimensional (2D) Laplace operator and the non-local step is a 2D Radon-based filtering. In a practical implementation, the Radon-based filtering is not computationally efficient. In this paper, we present an improvement of the original ATRACT algorithm. The 2D Radon-based filtering step in the original algorithm is replaced by an analytical 2D convolution, resulting in a significant improvement in computational performance while retaining the image quality benefits of the VOl algorithm.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"05 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127193787","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}

引用次数: 12