1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record最新文献_第3页

Effects of head movements measured during PET scans 在PET扫描中测量的头部运动的影响

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.501929

Michael S. Atkins, M. Menke

引用次数: 2

A low-noise, wide-band CMOS charge-sensitive preamplifier for use with APD/LSO PET detectors 一种低噪声，宽带CMOS电荷敏感前置放大器，用于APD/LSO PET探测器

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.504238

M. Paulus, J. M. Rochelle, M. Andreaco, D. Binkley

{"title":"A low-noise, wide-band CMOS charge-sensitive preamplifier for use with APD/LSO PET detectors","authors":"M. Paulus, J. M. Rochelle, M. Andreaco, D. Binkley","doi":"10.1109/NSSMIC.1995.504238","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.504238","url":null,"abstract":"The recent emergence of LSO as a potential scintillator for positron emission tomography (PET) and recent improvements in avalanche photodiode (APD) technology offer encouragement that an APD/LSO based PET detector may be commercially viable in the near future. An important component of any APD/LSO based PET detector will be the preamplifier used to read out the low-level detector signals. Due to the large number of detectors (>18,000) in a high-resolution PET scanner, the preamplifier must be implemented as a monolithic integrated circuit. Additionally, in order to achieve the timing resolution required for high resolution PET, the preamplifier must have a large band-width and a low equivalent input noise voltage. This paper presents a CMOS charge-sensitive preamplifier design which uses local feedback to improve the performance of the common gate transistor. The modified cascode circuit is analyzed and compared with a previously reported simple folded cascode circuit. A prototype circuit was fabricated in a 2 /spl mu/m NWELL CMOS process. The prototype amplifier has a measured 10-90% rise-time of 7 ns with an external input capacitance of /spl sim/6 pF and has an equivalent input noise voltage of /spl sim/1.1 nV/rt-Hz above the flicker noise corner. A pulse height resolution of 14.3% FWHM and a timing resolution of 1.57 ns FWHM (vs. plastic) were obtained with the preamplifier, an Advanced Photonix 5 mm diameter beveled-edge APD and 3.5/spl times/3.5/spl times/22 mm/sup 3/ Teflon wrapped LSO crystal.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129898946","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: 19

High rate large dynamic range analog circuitry and digitizers for fast calorimetry 用于快速量热的高速率大动态范围模拟电路和数字化仪

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.504258

B. Hallgren, F. Bal, G. Barr, P. Buchholz, F. Formenti, W. Funk, Y. Kozhevnikov, A. Lacourt, G. Laverriere, M. Martini, A. Papi, P. Ponting, M. Sozzi, O. Vossnack, H. Wahl

引用次数: 12

Iterative reconstruction with attenuation compensation from cone-beam projections acquired via non-planar orbit 基于非平面轨道锥束投影的衰减补偿迭代重建

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.510489

Y. Weng, G. L. Zeng, G. Gullberg

{"title":"Iterative reconstruction with attenuation compensation from cone-beam projections acquired via non-planar orbit","authors":"Y. Weng, G. L. Zeng, G. Gullberg","doi":"10.1109/NSSMIC.1995.510489","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.510489","url":null,"abstract":"Single photon emission computed tomography (SPECT) imaging with cone-beam collimators provides improved sensitivity and spatial resolution for imaging small objects with large field-of-view detectors. It is known that Tuy's (1983) cone-beam data sufficiency condition must be met in order to obtain artifact-free reconstructions. Even though Tuy's condition was derived for attenuation-free situation, the authors hypothesize that an artifact-free reconstruction can be obtained even if the cone-beam data are attenuated, provided the imaging orbit satisfies Tuy's condition and the exact attenuation map. In the authors' studies, emission data are acquired using nonplanar orbit such as circle-and-line orbit to acquire sufficient data for cone-beam tomographic reconstruction. An iterative conjugate gradient reconstruction algorithm is used to reconstruct projection data with a pre-acquired attenuation map. Quantitative accuracy of the attenuation corrected emission reconstruction is significantly improved. The authors observe that the cone-beam iterative algorithms are very sensitive to the projection and backprojection models, because each voxel is sampled anisotropically. Sampling artifacts (i.e., aliasing artifacts) sometimes are very severe for non-planar orbit data acquisition geometries. Better voxel models and sampling geometries are required in further investigations.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"6 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114019973","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: 22

SVX/silicon detector studies SVX/硅探测器研究

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.504270

L. Bagby, M. Johnson, R. Lipton, W. Gu

引用次数: 2

Analysis of trabecular patterns using fractal dimensions 用分形维数分析小梁图案

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.500310

E. Inoue, K. Ogawa

引用次数: 5

Energy resolution of xenon proportional counters: Monte Carlo and experimental results for 5.9 keV X-rays 氙比例计数器的能量分辨率:蒙特卡罗和5.9 keV x射线的实验结果

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.504183

P. Rachinhas, T. Dias, F. Santos, A. Stauffer, C. Conde

引用次数: 1

Surface horizontal logging for radon at a Superfund site 在一个超级基金站点进行氡的地面水平测井

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.510398

L. Gadeken, W. Madigan

引用次数: 0

Accurate attenuation correction in SPECT without transmission measurements 准确的衰减校正在SPECT没有传输测量

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.510422

A. Welch, R. Clack, G. Gullberg, F. Natterer

{"title":"Accurate attenuation correction in SPECT without transmission measurements","authors":"A. Welch, R. Clack, G. Gullberg, F. Natterer","doi":"10.1109/NSSMIC.1995.510422","DOIUrl":"https://doi.org/10.1109/NSSMIC.1995.510422","url":null,"abstract":"The current trend in attenuation correction for SPECT is to measure and reconstruct the attenuation coefficient map using a transmission scan, performed either sequentially or simultaneously with the emission scan. This approach requires dedicated hardware and increases the cost (and in some cases the scanning time) required to produce a clinical SPECT image. Furthermore, if short focal length fan-beam collimators are used for transmission imaging, the projection data may be truncated, leading to errors in the attenuation coefficient map. Our goal is to obtain information about the attenuation distribution from only the measured emission data by exploiting the fact that only certain attenuation distributions are consistent with a given emission dataset. Ultimately this consistency information will either be used directly to compensate for attenuation or combined with the incomplete information from fan-beam transmission measurements to produce a more accurate attenuation coefficient map. The simulations and phantom studies performed in this investigation show that, in certain circumstances, the consistency conditions of the SPECT data can be used to produce an accurate estimate of the attenuation map without performing any transmission measurements.","PeriodicalId":409998,"journal":{"name":"1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127979324","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

An image reconstruction method for dynamic PET 一种动态PET图像重建方法

1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record Pub Date : 1995-10-21 DOI: 10.1109/NSSMIC.1995.501917

M. Wernick, G. Wang, C. Kao, J. Yap, J. Mukherjee, M. Cooper, C. Chen

引用次数: 14