2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)最新文献_第5页

The design of high speed trigger multiplexer module for the Belle II Cylindrical Drift Chamber detector 贝尔II型圆柱漂移室探测器高速触发多路复用模块的设计

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551334

C.-H. Wang, S.-M. Liu, Y.-S Teng

引用次数: 2

A cost-effective high-resolution modular pixelated clinical SPECT detector based on small NaI (Tl) pixels with medium-size single-anode PMTs, utilizing spatial modulation of scintillation light output 经济高效的高分辨率模块化像素化临床 SPECT 探测器，基于小型 NaI (Tl) 像素和中型单阳极 PMT，利用闪烁光输出的空间调制功能

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551802

M. Rozler, W. Chang

{"title":"A cost-effective high-resolution modular pixelated clinical SPECT detector based on small NaI (Tl) pixels with medium-size single-anode PMTs, utilizing spatial modulation of scintillation light output","authors":"M. Rozler, W. Chang","doi":"10.1109/NSSMIC.2012.6551802","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551802","url":null,"abstract":"The current trend toward SPECT systems dedicated to imaging specific organs has created new pressures to improve gamma camera performance. A number of designs rely on projection minification to increase system sensitivity by acquiring multiple non-overlapping simultaneous views, placing stringent requirements on detector intrinsic spatial resolution (ISR). Curved detector geometries require modular assemblies, making monolithic slab detectors impractical due to their large dead areas at the edges. Previously, we described a modular detector based on a scintillator block comprised of 2.75 × 2.75 × 10 mm3 NaI(Tl) pixels in a 3 × 3 mm pitch and decoded by an array of 51 mm diameter single-anode PMTs. The event positioning accuracy of the curved detector, averaged over its entire area, exceeds that of a hypothetical monolithic slab detector with 2.75 mm ISR. To reduce the pixel size/pitch and thus increase linear sampling in the transaxial dimension (the dimension along which the detector is curved and minification is applied), we introduce scintillation light output modulation between neighboring pixels. A series of narrow absorbing stripes is applied at the exit surface of every other pixel column, producing a modulation in light output between adjacent pixels and allowing the use of energy discrimination to more effectively assign events to the correct pixel. Compared to the 3×3 mm pitch modules, our new detector, with 2.25 × 2.75 × 10 mm3 NaI(Tl) pixels (2.5 × 3 mm pitch), achieves the same event positioning performance in terms of the average event positioning error, while yielding 10.3% energy resolution. This translates to an improvement in linear sampling, without any loss in positioning accuracy (and, thus, effective spatial resolution), a mod","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":"127273403","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: 1

High position resolution MRPC developed for muon tomography 用于介子断层成像的高位置分辨率MRPC

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551048

Xingming Fan, Yi Wang, Xuewu Wang, M. Zeng, Z. Zeng, Ziran Zhao, Jianping Cheng

引用次数: 6

High resolution neutron imaging of microfossils 微化石的高分辨率中子成像

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551099

J. Jakubek, S. Pospíšil, J. Vacík, D. Vavřík

引用次数: 1

Investigation of three-dimensional localisation of neutron sources using parallel axis imaging 平行轴成像中子源三维定位的研究

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551178

K. Gamage, M. Joyce, G. Taylor

{"title":"Investigation of three-dimensional localisation of neutron sources using parallel axis imaging","authors":"K. Gamage, M. Joyce, G. Taylor","doi":"10.1109/NSSMIC.2012.6551178","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551178","url":null,"abstract":"In this paper we discuss the possibility of locating a neutron source in space using a scanning-based method, relative to the three-dimensional location of the detector. The scanning system comprises an organic liquid scintillator detector, a tungsten collimator and adjustable equatorial mount. The detector output is connected to a bespoke fast digitiser (Hybrid Instruments Ltd., UK) which streams digital samples to a personal computer. A neutron source has been attached to a vertical wall and the data have been collected in two stages. In the first case, the scanning system was placed a couple of metres away from the wall and, in the second case it moved few centimetres from the previous location, parallel to the wall. In each case data were collected from a grid of measurement points (set of azimuth angles for set of elevation angles) which covered the source on the wall. The discrimination of fast neutrons and gamma rays, detected by organic liquid scintillator detector, is carried out on the basis of pulse gradient analysis. Images are then produced in terms of the angular distribution of events for total counts, gamma rays and neutrons for both cases. The three-dimensional location of the neutron source can be obtained by considering the relative separation of the centres of the corresponding images of angular distribution of events. The measurements have been made at the National Physical Laboratory, Teddington, Middlesex, UK.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"34 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":"125877645","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

Expandable programmable integrated front-end for scintillator based photodetectors 基于闪烁体的光电探测器的可扩展可编程集成前端

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551729

A. Ros, R. Aliaga, V. Herrero-Bosch, J. Monzó, Antonio J. González, R. Colom, F. Mora, J. Benlloch

{"title":"Expandable programmable integrated front-end for scintillator based photodetectors","authors":"A. Ros, R. Aliaga, V. Herrero-Bosch, J. Monzó, Antonio J. González, R. Colom, F. Mora, J. Benlloch","doi":"10.1109/NSSMIC.2012.6551729","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551729","url":null,"abstract":"Scintillator based photodetectors tend to increase the number of output signals in order to improve spatial and energy resolutions. AMIC architecture was introduced in previous works as an alternative to traditional charge division front-ends. This novel architecture not only allowed to reduce the number of signals to be acquired but also provided more information about the light distribution on the photodetector surface. Another key feature of this new approach lies in its ability to manage any number of inputs, thus offering an expandable solution for photodetectors with a large number of output signals. The underlying idea in AMIC architecture is to calculate the moments of the detected light distribution in an analog fashion. Due to the additive nature of the moment calculation, the operation can be carried out on a single device or split it into several devices, adding the partial results afterwards. A new integrated front-end device AMIC2GR has been developed which improves several features of the original AMIC architecture. A new preamplifier configuration extends the maximum capacitive load thus allowing compatibility with many types of photomultipliers including SiPM without loss of performance. In order to test the expandability of AMIC architecture using the new AMIC2GR, a front end with 4 devices has been developed. Measurements with a 256-SiPM array were made. Furthermore, a new calibration method (Edna Calibration Method) to compensate gain and detector module differences was developed and tested. AMIC2GR allows to calibrate each SiPM individually to obtain better spatial resolution and homogeneity.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"79 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":"126189506","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

An MR-compatible singles detection and processing unit for simultaneous preclinical PET/MR 磁共振兼容单检测和处理单元，用于同时临床前PET/MR

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551628

B. Weissler, P. Gebhardt, M. Zinke, F. Kiessling, V. Schulz

引用次数: 19

Enhancing the efficiency of a field free line scanning device for magnetic particle imaging 提高无场线扫描磁粉成像装置的效率

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551587

M. Erbe, T. Sattel, Tobias Knopp, T. Buzug

引用次数: 3

Modular miniPET: A comparison between 10 and 12 detector modules 模块化miniPET: 10和12个检测器模块之间的比较

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551594

A. Turco, I. Valastyán, M. Colarieti-Tosti

引用次数: 0

Filtered sampling for PET PET过滤取样

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Pub Date : 2012-10-01 DOI: 10.1109/NSSMIC.2012.6551572

M. Magdics, László Szirmay-Kalos, B. Tóth, Tamás Umenhoffer

{"title":"Filtered sampling for PET","authors":"M. Magdics, László Szirmay-Kalos, B. Tóth, Tamás Umenhoffer","doi":"10.1109/NSSMIC.2012.6551572","DOIUrl":"https://doi.org/10.1109/NSSMIC.2012.6551572","url":null,"abstract":"In tomography reconstruction, the relationship between the finite-element representation of the objective function and the expected number of hits in detectors - or in other words, the particle transport - is described by the system matrix. With the evolution of high-performance hardware, precise on-the-fly estimation of the system matrix becomes more and more feasible, which allows the use of patient-dependent data and makes it unnecessary to deal with the compression of enormous matrices. On-the-fly system matrix generation requires the online approximation of high dimensional integrals, which is usually attacked by Monte Carlo quadrature and importance sampling. Determining the number of samples used by the estimators belongs to the classical tradeoff problem between accuracy and computational time. However, the approximation error mainly comes from the measurement noise and high frequency components of the measured object that cannot be captured using a given sample density. In this paper, we propose the application of filtered sampling for the forward projection step of iterative ML-EM based PET reconstruction to decrease the variance of the integrand and thus to reduce the error of integral estimation for a given set of samples. The input of the forward projection is filtered using a low-pass filter, which reduces noise and increases the probability that samples do not miss high frequency peaks - e.g. a point source. The iteration thus converges to a modified fixed point, from which the original function can be extracted by applying the same filter. The presented model is built into the TeraTomo™ system.","PeriodicalId":187728,"journal":{"name":"2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)","volume":"371 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":"115180783","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: 7