2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)最新文献_第8页

Reconstruction of CT images from sparse-view polyenergetic data using total variation minimization 利用总变差最小化从稀疏视图多能数据重建CT图像

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582013

T. Humphries, A. Faridani

{"title":"Reconstruction of CT images from sparse-view polyenergetic data using total variation minimization","authors":"T. Humphries, A. Faridani","doi":"10.1109/NSSMIC.2015.7582013","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582013","url":null,"abstract":"Recent work in CT image reconstruction has seen increasing interest in the use of compressive sensing techniques to reconstruct images from sparse-view projection data, with the goal of reducing radiation dose as well as scan time. Most often these reconstruction approaches exploit sparsity in the gradient of the image using total variation (TV) minimization. Following the existing theoretical results from compressive sensing, these approaches typically assume a linear measurement model, which corresponds to data generated from a monoenergetic X-ray beam. Most clinical CT systems generate X-rays from a polyenergetic spectrum, however, which is inconsistent with a linear system model and produces the well-known beam hardening artifacts. Such artifacts have been observed in some studies on sparse-view CT reconstruction using a linear model. In this work we incorporate an existing polyenergetic iterative technique known as polyenergetic SART (pSART) into a TV minimization reconstruction algorithm. Using numerical phantom experiments, we demonstrate that this polyenergetic TV minimization algorithm is able to reconstruct images free of both undersampling and beam hardening artifacts from sparse-view, polyenergetic projection data.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124250948","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: 2

Advanced Compton imagers: From universal exploration down to earth investigation and medical application 先进的康普顿成像仪:从宇宙探测到地球探测和医学应用

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582261

Wonho Lee, Taewoong Lee, Hyounggun Lee

引用次数: 0

Fundamentals of a scalable network in SPADnet-based PET systems 基于spadnet的PET系统中可扩展网络的基本原理

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581985

Martijn Bijwaard, C. Veerappan, C. Bruschini, E. Charbon

引用次数: 6

Performance evaluation of MAP algorithms with different penalties, object geometries and noise levels 不同惩罚、物体几何形状和噪声水平下MAP算法的性能评价

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582101

Yu-Jung Tsai, A. Bousse, Matthias Joachim Ehrhardt, B. Hutton, S. Arridge, K. Thielemans

引用次数: 7

Study of antiproton annihilation in silicon with a hybrid pixel detector using the TimePix3 readout 用TimePix3读出的混合像素探测器研究硅中的反质子湮灭

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581982

H. Holmestad

{"title":"Study of antiproton annihilation in silicon with a hybrid pixel detector using the TimePix3 readout","authors":"H. Holmestad","doi":"10.1109/NSSMIC.2015.7581982","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581982","url":null,"abstract":"The main goal of the AEgIS experiments is to measure the gravitational force for anti-hydrogen, testing Einstein's weak equivalence principle, which states that all bodies falls with the same acceleration, independently from their mass and composition. The measurement will be done using an anti-hydrogen beam sent trough a classical moire deflectometer. To measure the deflection of the beam from a straight path a position sensitive silicon detector followed by an emulsion detector and a scintillating fiber time-of-flight detector will be used. We present here a study performed using a novel hybrid pixel detector, employing the Timepix3 readout chip to tag and spatially resolve antiproton annihilations in silicon. In autumn 2014 we performed a test-experiment on a secondary beam line to the AEgIS experiment, where a pulsed beam of anti-protons of energy 5.3 MeV was delivered from the Antiproton Decelerator of CERN accelerator complex. Taking advantage of the high spatial resolution, ToA capabilities and extended energy range of the Timepix3, this study investigates unique features of antiproton annihilation events in silicon. We are for the first time able to set clear criteria to characterize an antiproton annihilation using a silicon detector.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116030175","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

Pulse-shape analysis of neutron-induced scintillation light in Ni-doped 6LiF/ZnS ni掺杂6LiF/ZnS中中子诱发闪烁光的脉冲形状分析

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581914

C. Cowles, R. S. Behling, G. Imel, R. Kouzes, A. Lintereur, S. Robinson, S. Stave, E. Siciliano, Zheming Wang

引用次数: 0

Tuning the intrinsic radiation of Lutetium based scintillators through selective neutron activation 通过选择性中子活化调谐镥基闪烁体的本禀辐射

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581830

V. Martin, S. Siegel, H. Rothfuss, L. Eriksson, C. Buchanan

{"title":"Tuning the intrinsic radiation of Lutetium based scintillators through selective neutron activation","authors":"V. Martin, S. Siegel, H. Rothfuss, L. Eriksson, C. Buchanan","doi":"10.1109/NSSMIC.2015.7581830","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581830","url":null,"abstract":"Lutetium Oxyorthosilicate (LSO) is an attractive scintillator for positron emission tomography (PET) imaging, due to its relatively high light output, short decay time, and high stopping power. LSO has a 2.6% natural abundance of Lu-176, a long-lived (3.78×1010 years) radioisotope that generates an intrinsic background. This low background rate has been capitalized on to perform PET quality checks and measure transmission data. In this work, LSO was exposed to the neutrons produced by the O-18(p, n)F-18 reaction in a Siemens Eclipse Cyclotron to selectively alter the intrinsic background rate. The cyclotron was run for a total of 1827 microamp-hours over two weeks, with mean proton energy of 11 MeV. Ten LSO pixels (4×4×20 mm3) were placed in locations selected for a desired neutron energy range. The range of neutron energies produced permitted the Lu-175(n,γ)Lu-176 and Lu-176(n,γ)Lu-177 reactions. Three of the pixels were placed behind polyethylene to further moderate the neutrons. The pixel's scintillation properties were measured to determine if they had been damaged by the irradiation. Gamma ray spectroscopy was performed for several weeks following the irradiation to evaluate the transmutations engendered. Despite an increase in trapping centers, scintillation properties were not changed, and the expected Lu-177 activation occurred.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117113601","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

Performance evaluation of an innovative integrated charge-sensitive preamplifier with dynamic range booster 带动态范围增强器的新型集成电荷敏感前置放大器的性能评价

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581811

A. Pullia, S. Capra

引用次数: 3

Comparing front-end alternatives for SiPM's in single-photon time resolution applications 比较单光子时间分辨率应用中SiPM的前端替代方案

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581821

F. Ciciriello, F. Corsi, F. Licciulli, C. Marzocca, G. Matarrese

{"title":"Comparing front-end alternatives for SiPM's in single-photon time resolution applications","authors":"F. Ciciriello, F. Corsi, F. Licciulli, C. Marzocca, G. Matarrese","doi":"10.1109/NSSMIC.2015.7581821","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581821","url":null,"abstract":"Thanks to single photon detection capability and excellent intrinsic timing resolution, silicon photomultipliers represent an interesting solution in an increasing range of applications which require accurate evaluation of the arrival time of single photons. In this contribution, different front-end electronics solutions for this kind of detectors are compared, to find out more about the achievable timing performance. For this purpose, simple relationships have been established between the main parameters of both detector and preamplifier and the time resolution, expressed by means of the time jitter when leading edge discrimination is the chosen time pick-off technique. A simplified SiPM model, suitable to describe the very first part of the transient response of the detector to a photon which triggers an avalanche breakdown in one of its micro-cells, has been exploited. Considering also the effects of the parasitic inductance associated to the interconnections between detector and front-end electronics, we conclude that the current-mode read-out approach offers some advantages over the other considered design styles, thus representing the most suitable solution for single-photon timing measurement applications based on SiPM detectors.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128294520","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: 2

Fast estimation of image variance for time-of-flight PET reconstruction 飞行时间PET重建中图像方差的快速估计

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582040

Mengdie Wang, G. Hu, G. El Fakhri, Hui Zhang, Quanzheng Li

引用次数: 0