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国家自然科学基金(10275063)

作品数:10 被引量:7H指数:2
相关作者:许咨宗刘士涛汪兆民祝杰刘杨更多>>
相关机构:中国科学技术大学更多>>
发文基金:国家自然科学基金更多>>
相关领域:医药卫生核科学技术理学机械工程更多>>

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10 条 记 录,以下是 1-10
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用切伦科夫光测量网栅型光电倍增管的渡越时间分散(英文)
2005年
描述了一种利用伽马射线照射光阴极生成的切伦科夫光来测定光电倍增管渡越时间分散的实验方法,并利用这种方法测量了Hamamatsu R-5924光电倍增管的渡越时间分散.
刘杨汪兆民许咨宗陈宏芳李澄邵明刘士涛祝杰
关键词:单光子
采用NaI(Tl)晶针阵列的小型单管γ相机的性能研究被引量:1
2005年
通过实验对采用NaI(Tl)晶针阵列的小型单管γ相机的性能进行了研究,得到的实验结果是:(1)能量响应:对Am-241(59.5 keV)的γ射线能量分辨率为19%;(2)位置线性:绝对非线性1 mm,微分非线性0.67 mm;(3)空间分辨率:半高宽为2.2 mm.得出的结论是:(1)采用NaI(Tl)晶针阵列的小型单管γ相机的压缩效应较小;(2)由于晶针单元限制了光子的分布,所以采用NaI(Tl)晶针阵列的小型单管γ相机的空间分辨率基本上由晶针的尺寸大小决定;(3)与平板式NaI(Tl)晶体小型单管γ相机相比,采用NaI(Tl)晶针阵列的小型单管γ相机的能量响应、位置响应和空间分辨率等性能都有一个较大的提高.
祝杰刘士涛雷晓文许咨宗汪兆民
关键词:空间分辨率
Monte-Carlo simulation of a compact gamma-ray detector using wavelength-shifting fibers coupled to a YAP scintillation crystal被引量:1
2008年
The production and transportation of fluorescent light produced in wavelength-shifting fibers (WSFs) coupled to YAP scintillation crystal is simulated using the GEANT4 codes. An advantage of the wavelength-shifting fiber readout technique over a direct readout with a position-sensitive photo-sensor is the reduced requirement for position sensitive photomultiplier tube photocathode area. With this gamma-ray detector, the gamma camera is small and flexible and has larger effective field of view and low cost. Simulation results show that a) a mean 12 of photons per 59.5 keV gamma ray interaction is produced in the WSF located nearest to the incident gamma ray, and a spatial resolution of 3.6 mm FWHM is obtained, b) a mean 27 of photons per 140 keV gamma ray interaction is produced and a spatial resolution of 3.1 mm FWHM is obtained. Results demonstrate the feasibility of this concept of a compact gamma-ray detector based on wavelength-shifting fibers readout. However, since the very low photoelectron levels, it is very important to use a photon counting device with good single photo-electron response to readout the WSFs.
祝杰马红光马文彦曾晖汪兆民许咨宗
一种像增强屏特性的研究
2005年
报道了一种用于像增强的闪烁屏(Gd2O2S:Tb)特性的实验研究结果:其光产额约为9×104/MeV;用单光子时间分辨谱仪测得荧光衰减时间为833μs;发射荧光有几个窄的谱带,其中545nm的谱带占优势。实验测得该闪烁屏吸收白光形成的余辉具有分钟级的衰减时间。
刘春雷刘杨刘士涛许咨宗汪兆民
关键词:光产额余辉发射光谱
A compact gamma-ray detector using wavelength-shifting fibers coupled to YAP scintillation crystal被引量:1
2008年
The performance of a compact position sensitive gamma-ray detector based on wavelength-shifting fibers coupled to YAlO3:Ce scintillation crystal was evaluated using a Monte-Carlo simulation method. The simulation model has been setup using the GEANT4 codes. Compared with the gamma-ray detector based on the YAlO3:Ce scintillation crystal coupled to Hamamastu R2486 position sensitive photomultiplier tube, the results indicate that the gamma-ray detector based on wavelength-shifting fibers readout has good position linearity, good spatial resolution and larger effective field of view. The image and point spread function of measured point were presented. The spatial resolution response as a function of position was obtained. The factors influencing spatial resolution and position linearity were discussed.
ZHU JieMA HongguangMA WenyanZENG HuiWANG ZhaominXU Zizhong
关键词:放射线诊断模拟技术
小型NaI(Tl)晶针阵列γ相机性能研究
介绍了小型NaI(Tl)晶针阵列γ相机的实验装置和方法并对其性能进行了研究。实验结果表明,对241Am(59.5keV)的γ射线能量分辨率为19%;空间分辨率2.2mm。与平板式γ相机比较,该γ相机的压缩效应小,其空间分...
祝杰刘士涛许咨宗汪兆民
关键词:空间分辨率
A compact gamma camera with scintillation array and parallel-hole collimator被引量:1
2008年
A new compact gamma camera for small object imaging has been developed.It consists of a pixelized Nal(T1) scintillator array coupled to a position sensitive photomultiplier tube (Hamamatsu R2486) with a parallel-hole lead collimator.The compact camera has better spatial resolution than Anger camera.The average value of intrinsic spatial resolutions is 2.3 mm (FWHM).The overall spatial resolution (FWHM) is 3,5 and 6 mm at 0,2.5 and 3 mm SCD (source-to-collimator distance),respectively.The phantom studies with the compact camera have demonstrated that parallel-hole collimator gamma camera is a practical technique for nuclear medicine application.
ZHU JieMA HongguangMA WenyanZENG HuiWANG ZhaominXU Zizhong
关键词:核医学肿瘤诊断
Comparison of two position sensitive gamma-ray detectors based on continuous YAP and pixellated NaI(TI) for nuclear medical imaging applications被引量:1
2008年
Dedicated position sensitive gamma-ray detectors based on position sensitive photomultiplier tubes (PSPMTs) coupled to scintillation crystals, have been used for the construction of compact gamma-ray imaging systems, suitable for nuclear medical imaging applications such as small animal imaging and single organ imaging and scintimammography. In this work, the performance of two gamma-ray detectors: a continuous YAP scintillation crystal coupled to a Harnamastu R2486 PSPMT and a pixellated NaI(TI) scintillation array crystal coupled to the same PSPMT, is compared. The results show that the gamma-ray detector based on a pixellated NaI(TI) scintillation array crystal is a promising candidate for nuclear medical imaging applications, since their performance in terms of position linearity, spatial resolution and effective field of view (FOV) is superior than that of the gamma-ray detector based on a continuous YAP scintillation crystal. However, a better photodetector (Hamamatau H8500 Flat Panel PMT, for example) coupled to the continuous crystal is also likely a good selection for nuclear medicine imaging applications.
祝杰马红光马文彦曾晖汪兆民许咨宗
关键词:PSPMT
Study of the characteristics of a scintillation array and single pixels for nuclear medicine imaging applications被引量:2
2009年
By using a pixelized Nal(T1) crystal array coupled to a R2486 PSPMT, the characteristics of the array and of a single pixel, such as the light output, energy resolution, peak-to-valley ratio (P/V) and imaging performance of the detector were studied. The pixel size of the NaI(TI) scintillation pixel array is 2 mm×2 mm×5 mm. There are in total 484 pixels in a 22×22 matrix. In the pixel spectrum an average peak-to-valley ratio (P/V) of 16 was obtained. In the image of all the pixels, good values for the Peak-to- Valley ratios could be achieved, namely a mean of 17, a maximum of 45 and the average peak FWHM (the average value of intrinsic spatial resolution) of 2.3 mm. However, the PSPMT non-uniform response and the scintillation pixels array inhomogeneities degrade the imaging performance of the detector.
祝杰马红光马文彦曾晖汪兆民许咨宗
关键词:CHARACTERISTICS
Development of a compact high resolution gamma-ray detector for E-CT applications被引量:2
2007年
A compact gamma-ray detector with good spatial resolution for emission computed tomography (E-CT) applications has been developed. The detector is composed of NaI(Tl) scintillation pixels array and Hamamastu R2486-05 PSPMT. Having a pixel size of 2 mm × 2 mm and an overall dimension of 48.2 mm × 48.2mm × 5 mm, it has 484 pixels in a 22×22 matrix. An average spatial resolution of 2.5mm (FWHM) was achieved. The slope of position linearity is constant within 10% in a range of 40mm. After corrections, the average value of differential non-linearity and absolute non-linearity were 0.16mm and 0.535mm respectively, and a 17% at FWHM of total energy resolution for 241Am was obtained.
ZHU JieMA HongguangMA WenyanZENG HuiWANG ZhaominXU Zizhong
关键词:探测器放射线
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