Analytical reconstruction of 4D dynamic cardiac SPECT with noise-reduction and non-uniform attenuation compensation [0.03%]
具有降噪和非均匀衰减校正的4D动态心脏SPECT分析重建方法
Yi Fan,Hongbing Lu,Chongyang Hao et al.
Yi Fan et al.
BACKGROUND: This study focuses on quantitative reconstruction of dynamic cardiac SPECT. MATERIAL AND METHODS: The Karhunen-Loeve (KL) transform is first applied to gated frames or sinogram data to de-correlate the dynamic information along ...
C J Kenney,J D Segal,E Westbrook et al.
C J Kenney et al.
Many systems in medicine, biology, high-energy physics, and astrophysics require large area radiation sensors. In most of these applications, minimizing the amount of dead area or dead material is crucial. We have developed a new type of si...
An overview of fast convergent ordered-subsets reconstruction methods for emission tomography based on the incremental EM algorithm [0.03%]
基于增量EM算法的快速收敛型排序子集重建方法在发射断层扫描中的应用综述
Ing-Tsung Hsiao,Parmeshwar Khurd,Anand Rangarajan et al.
Ing-Tsung Hsiao et al.
Statistical reconstruction has become popular in emission computed tomography but suffers slow convergence (to the MAP or ML solution). Methods proposed to address this problem include the fast but non-convergent OSEM and the convergent RAM...
A prototype of very high resolution small animal PET scanner using silicon pad detectors [0.03%]
一种使用硅PAD探测器的高分辨率小动物PET扫描仪原型机
Sang-June Park,W Leslie Rogers,Sam Huh et al.
Sang-June Park et al.
A very high resolution small animal positron emission tomograph (PET) which can achieve sub-millimeter spatial resolution is being developed using silicon pad detectors. The prototype PET for a single slice instrument consists of two 1 mm t...
F A Dilmanian,Y Qu,S Liu et al.
F A Dilmanian et al.
Irradiation with parallel arrays of thin, planar slices of X-ray beams (microplanar beams, or microbeams) spares normal tissue, including the central nervous system (CNS), and preferentially damages tumors. The effects are mediated, at leas...
Analysis of the neutron component at high altitude mountains using active and passive measurement devices [0.03%]
基于能动和被动测量装置的高海拔山区快中子成分分析研究
M Hajek,T Berger,W Schoner et al.
M Hajek et al.
The European Council directive 96/29/Euratom requires dosimetric precautions if the effective dose exceeds 1 mSv/a. On an average, this value is exceeded by aircrew members. Roughly half of the radiation exposure at flight altitudes is caus...
Measurement of the energy spectrum of cosmic-ray induced neutrons aboard an ER-2 high-altitude airplane [0.03%]
测量宇宙射线产生的ER-2高空飞机载能谱中 neutron
P Goldhagen,M Reginatto,T Kniss et al.
P Goldhagen et al.
Crews working on present-day jet aircraft are a large occupationally exposed group with a relatively high average effective dose from galactic cosmic radiation. Crews of future high-speed commercial aircraft flying at higher altitudes would...
Response of silicon-based linear energy transfer spectrometers: implication for radiation risk assessment in space flights [0.03%]
基于硅的线性能量传递谱仪的响应：对航天飞行中辐射风险评估的意义
G D Badhwar,P M O&#x;Neill
G D Badhwar
There is considerable interest in developing silicon-based telescopes because of their compactness and low power requirements. Three such telescopes have been flown on board the Space Shuttle to measure the linear energy transfer spectra of...
P Spillantini,F Taccetti,P Papini et al.
P Spillantini et al.
During the interplanetary flights the crewmembers will be exposed to cosmic ray radiation with great risk for their health. The absorbed dose due to CR depends on the galactic (GCR) or solar (SCR) origin. GCRs are isotropic and relatively h...
Biomedical imaging using hyperpolarized noble gas MRI: pulse sequence considerations [0.03%]
利用超极化惰性气体磁共振成像进行生物医学影像的技术考虑
L Zhao,M S Albert
L Zhao
Hyperpolarized noble gas MRI is a new technique for imaging of gas spaces and tissues that have been hitherto difficult to image, making it a promising diagnostic tool. The unique properties of hyperpolarized species, particularly the non-r...