This article presents a brief overview of the development of high-resolution SPECT for small-animal im- aging. A pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution a...This article presents a brief overview of the development of high-resolution SPECT for small-animal im- aging. A pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution and detection efficiency in comparison with a parallel-hole collimator. The theory of imaging characteristics of the pin- hole collimator is presented and the designs of the pinhole aperture are discussed. The detector technologies used for the development of small-animal SPECT and the recent advances are presented. The evolving trend of small-animal SPECT is toward a multi-pinhole and a multi-detector system to obtain a high resolution and also a high detection ef- ficiency.展开更多
Two-fragment correlation functions have been measured for ^(40)Ar+^(197)Au collisions at E/A=25 MeV.Based on the three-body trajectory calculation,a mean emission time of T~450 fm/c for light fragments was extracted f...Two-fragment correlation functions have been measured for ^(40)Ar+^(197)Au collisions at E/A=25 MeV.Based on the three-body trajectory calculation,a mean emission time of T~450 fm/c for light fragments was extracted from the measured correlation functions.This result suggests that the sequential decay occurs at this energy.展开更多
文摘This article presents a brief overview of the development of high-resolution SPECT for small-animal im- aging. A pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution and detection efficiency in comparison with a parallel-hole collimator. The theory of imaging characteristics of the pin- hole collimator is presented and the designs of the pinhole aperture are discussed. The detector technologies used for the development of small-animal SPECT and the recent advances are presented. The evolving trend of small-animal SPECT is toward a multi-pinhole and a multi-detector system to obtain a high resolution and also a high detection ef- ficiency.
基金Supported by the National Natural Science Foundation of Chinathe Foundation of the Chinese Academy of Sciences.
文摘Two-fragment correlation functions have been measured for ^(40)Ar+^(197)Au collisions at E/A=25 MeV.Based on the three-body trajectory calculation,a mean emission time of T~450 fm/c for light fragments was extracted from the measured correlation functions.This result suggests that the sequential decay occurs at this energy.
