2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)最新文献_第5页

A prototype gamma tomosynthesis system for molecular breast imaging 用于乳腺分子成像的伽马断层合成系统原型

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582258

D. Gilland, B. Welch, Seung Joon Lee, B. Kross, A. Weisenberger

{"title":"A prototype gamma tomosynthesis system for molecular breast imaging","authors":"D. Gilland, B. Welch, Seung Joon Lee, B. Kross, A. Weisenberger","doi":"10.1109/NSSMIC.2015.7582258","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582258","url":null,"abstract":"We are developing an improved gamma camera for molecular breast imaging (MBI) that allows tomographic imaging and improved signal-to-noise over conventional planar methods. We have built a novel gamma camera for MBI that utilizes limited angle tomography, similar to x-ray tomosynthesis, to generate images with depth information and improved signal-to-noise. A unique feature of the gamma tomosynthesis system is a variable-angle slant hole (VASH) collimator. This collimator allows the camera to remain flush against the compression paddle during the tomographic acquisition, which achieves high spatial resolution and simplified detector motion. We constructed a VASH collimator from a stack of tungsten sheets, each sheet containing a matrix of holes created by photo-etching. With the holes of the sheets aligned, a parallel-hole collimator is created; shearing the sheets creates a variable angle slant hole collimator. The shearing is controlled by a motorized mechanism. The collimator was mounted on a commercial MBI camera and projection data were acquired of a set of capillary tube line sources over a 50° range of angles. The projection data were reconstructed using the iterative MLEM method. Results demonstrated the ability of the system to resolve in the depth dimension, and spatial resolution matched expected values. We conclude that the proposed gamma tomosynthesis system has the potential to provide improved signal-to-noise over conventional MBI methods and allow a reduction in the administered radioactivity and patient dose.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"8 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":"117016489","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

Development of a digital unrestrained mouse phantom with non-periodic deformable motion 具有非周期可变形运动的数字无约束鼠标幻影的研制

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582140

I. Klyuzhin, G. Stortz, V. Sossi

引用次数: 2

Silicon photomultipliers in scintillation detectors used for gamma-ray energies up to 6.1 MeV 用于伽马射线能量高达6.1兆电子伏特的闪烁探测器中的硅光电倍增管

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581742

M. Grodzicka, T. Szczesniak, M. Moszynski, L. Swiderski, M. Szawłowski

{"title":"Silicon photomultipliers in scintillation detectors used for gamma-ray energies up to 6.1 MeV","authors":"M. Grodzicka, T. Szczesniak, M. Moszynski, L. Swiderski, M. Szawłowski","doi":"10.1109/NSSMIC.2015.7581742","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581742","url":null,"abstract":"The aim of this paper is to study usefulness of SiPM light readout in detection of gamma rays up to 6.1MeV in combination with various scintillators. The reported measurements were made with 3 samples of one type of Hamamatsu TSV (Through Silicon Via technology) MPPC arrays. These 4×4 channel arrays have a 50×50 μm2 cell size and 12×12 mm2 effective active area. All the tests were done in a climatic chamber. The following scintillators were used: CsI(Tl), CeBr3, NaI(Tl). The studies are focused on optimization of the MPPC performance for practical use in detection of high energy gamma rays. The optimization includes selection of the optimum operating voltage in respect to the energy resolution, verification of the dynamic range, linearity and pulse amplitude. The energy spectra for energies between 320keV and 6.1MeV are presented and compared with data acquired with a classic photomultiplier. Such comparison allowed study of nonlinearity of the tested MPPCs, correction of the energy spectra and proper analysis of the energy resolution. The temperature tests show strong breakdown voltage dependence on the temperature change and define requirements for the stabilization method in real life applications.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"38 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":"117077944","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: 5

Wavelet analysis of high and low resolution gamma-ray spectra: An investigation of peak finding techniques 高分辨率和低分辨率伽玛能谱的小波分析:寻峰技术的研究

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582000

C. I. Thompson, K. Vaughan, R. Turner

{"title":"Wavelet analysis of high and low resolution gamma-ray spectra: An investigation of peak finding techniques","authors":"C. I. Thompson, K. Vaughan, R. Turner","doi":"10.1109/NSSMIC.2015.7582000","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582000","url":null,"abstract":"For the detection of radiological materials, peak identification within gamma spectroscopy data is a useful tool. This paper discusses the application of wavelet analysis as a peak finding technique to high resolution data recorded by high purity germanium (HPGe) detectors. Whilst the wavelet method has been previously applied to high efficiency/low resolution data, this work considers the applicability of wavelet analysis to high resolution spectral datasets with varying levels of background. An algorithm has been developed that automatically locates wavelet transform modulus maxima (WTMM) lines; the method identifies local maxima and minima of the scalogram joining data points within the same potential. The approach was applied to analyse a range of experimental recorded radiation spectra, both from shielded and un-shielded sources. Peak locations were found by comparing peak widths with those expected based on the detector resolution function (DRF), alongside WTMM straightness and line length filter tests. Findings indicated that, when implemented in this approach, the wavelet analysis method was applicable to the identification of high-resolution photopeaks when concealed within varying levels of background.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"55 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":"128377065","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

Unmanned aerial vehicle equipped with spectroscopic CdZnTe detector for detection and identification of radiological and nuclear material 配备CdZnTe光谱探测器的无人驾驶飞行器，用于检测和识别放射性和核材料

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582264

J. Aleotti, Giorgio Micconi, S. Caselli, G. Benassi, N. Zambelli, D. Calestani, M. Zanichelli, M. Bettelli, A. Zappettini

引用次数: 15

Measurements and TCAD simulations of bulk and surface radiation damage effects in silicon detectors 硅探测器体和表面辐射损伤效应的测量和TCAD模拟

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581944

F. Moscatelli, P. Maccagnani, D. Passeri, G. Bilei, L. Servoli, A. Morozzi, G. Betta, R. Mendicino, M. Boscardin, N. Zorzi

引用次数: 8

A low-power low-noise synchronous pixel front-end chain in 65 nm CMOS technology with local fast ToT encoding and autozeroing for extreme rate and radiation at HL-LHC 采用65纳米CMOS技术的低功耗低噪声同步像素前端链，具有本地快速ToT编码和HL-LHC极端速率和辐射的自动归零

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581969

L. Pacher, E. Monteil, A. Rivetti, N. Demaria, M. D. Da Rocha Rolo

{"title":"A low-power low-noise synchronous pixel front-end chain in 65 nm CMOS technology with local fast ToT encoding and autozeroing for extreme rate and radiation at HL-LHC","authors":"L. Pacher, E. Monteil, A. Rivetti, N. Demaria, M. D. Da Rocha Rolo","doi":"10.1109/NSSMIC.2015.7581969","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7581969","url":null,"abstract":"A low-power and low-noise synchronous front-end chain in a commercial 65 nm CMOS technology suitable for the future pixel upgrades at the CERN Large Hadron Collider (LHC) is presented. A shaper-less Charge-Sensitive Amplifier (CSA) with constant current feedback provides triangular pulse shaping for linear Time-over-Threshold (ToT) charge measurement. The sensor leakage current is compensated by the same feedback network. A track-and-latch voltage comparator is adopted for the hit discrimination. The hit generation is synchronized with a 40 MHz clock, minimizing time-walk issues in the time-stamp assignment. Fast ToT charge encoding up to 8-bit resolution can be retrieved at the pixel level exploiting a high-frequency self-generated clock signal. This is obtained by turning the latch into a voltage-controlled oscillator (VCO) using asynchronous logic. Pixel-to-pixel threshold variations are compensated by means of an autozeroed scheme, thus avoiding the need of a on-pixel D/A converter. An array of 8 × 8 cells with 50 μm × 50 μm pixel size has been prototyped. Design specifications, implementation and test results are discussed.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"1 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":"129309995","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: 17

Formation of diode detectors by nanosecond laser irradiation of CdTe-In interface from the semiconductor side 纳秒激光从半导体侧照射CdTe-In界面形成二极管探测器

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582277

K. Zelenska, D. Gnatyuk, T. Aoki

引用次数: 5

A non-local means post-filter with spatially adaptive filtering strength for whole-body PET 一种具有空间自适应滤波强度的全身PET非局部均值后滤波方法

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7582060

Wenyuan Qi, T. Xia, Xiaofeng Niu, Changguo Ji, Mark Winkler, E. Asma, Wenli Wang

{"title":"A non-local means post-filter with spatially adaptive filtering strength for whole-body PET","authors":"Wenyuan Qi, T. Xia, Xiaofeng Niu, Changguo Ji, Mark Winkler, E. Asma, Wenli Wang","doi":"10.1109/NSSMIC.2015.7582060","DOIUrl":"https://doi.org/10.1109/NSSMIC.2015.7582060","url":null,"abstract":"We propose a spatially adaptive Non-Local Means (NLM) post-filtering approach for whole-body clinical Positron Emission Tomography (PET) imaging. Our approach is aimed at avoiding different effective smoothing strengths in different organs that result from with traditional non-adaptive NLM. We vary the smoothing strength according to the intensity level around a given voxel such that regions with low absolute noise levels are smoothed less and those with high absolute noise levels are smoothed more. We evaluated this approach and compared it to alternative filtering techniques by inserting lesions of known size and activity into clinical datasets acquired on a Toshiba CelesteionTM TOF-PET/CT scanner. Images were reconstructed with list-mode Ordered-Subset Expectation-Maximization (OSEM) algorithm with all physical corrections inside the system model prior to post-filtering. We qualitatively evaluated the techniques by comparing the differences between filtered and original images and quantitatively evaluated them using lesion contrast vs. background variability curves. Both evaluations showed that the proposed method could better accommodate varying noise statistics in whole-body PET images and better preserve lesion contrast across different anatomical regions.","PeriodicalId":106811,"journal":{"name":"2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)","volume":"1 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":"129661177","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

8-Channels high-resolution TDC in FPGA FPGA中的8通道高分辨率TDC

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) Pub Date : 2015-10-01 DOI: 10.1109/NSSMIC.2015.7581245

N. Lusardi, A. Geraci

引用次数: 16