Reevaluation of T2-weighted fast field echo (T2FFE): application to rapid volumetric black-blood imaging [0.03%]
T2加权快速场回波(T2FFE)的再评价：在快速容积无对比剂黑血成像中的应用
Masami Yoneyama,Masanobu Nakamura,Takashi Tabuchi et al.
Masami Yoneyama et al.
T₂-fast field echo (T2FFE) sequence is a rapid T₂-weighted steady state free precession sequence, but has not become a widely utilized MR-imaging strategy because of its low signal-to-noise ratio and high sensitivity to motion. These effe...
Comparative Study
Radiological physics and technology. 2013 Jul;6(2):305-12. DOI:10.1007/s12194-013-0201-x 2013
Where should we measure the entrance air kerma rate during acceptance testing of the automatic dose control of a fluoroscopic system? [0.03%]
接受性测试荧光镜系统自动剂量控制的入口空气KERMA率应在何处测量？
Atsushi Fukuda,Tosiaki Miyati,Kosuke Matsubara
Atsushi Fukuda
In Japan, the entrance air kerma rate (EAKR) to a patient cannot exceed 50 mGy/min in conventional fluoroscopy. However, it is unclear where the EAKR should be measured. We obtained the tube potential and tube current as a function of polym...
Detection of ground-glass opacities by use of hybrid iterative reconstruction (iDose) and low-dose 256-section computed tomography: a phantom study [0.03%]
利用混合迭代重建的低剂量256层CT检测磨玻璃密度病变：体模研究
Ko Higuchi,Michinobu Nagao,Yoshio Matsuo et al.
Ko Higuchi et al.
The detection of ground-glass opacities (GGOs) is an important issue in lung cancer screening with low-dose CT. The iterative reconstruction (IR) technique has the ability to improve the image quality relative to the filtered back projectio...
Feasibility of low-radiation-dose CT for abdominal examinations with hybrid iterative reconstruction algorithm: low-contrast phantom study [0.03%]
基于混合迭代重建算法的低剂量腹部CT可行性研究：低对比度体模试验
Masatoshi Kondo,Masamitsu Hatakenaka,Ko Higuchi et al.
Masatoshi Kondo et al.
Our purpose in this study was to evaluate the image quality of low-radiation-dose CT using hybrid iterative reconstruction (HIR), and to compare the results with those of filtered back projection (FBP) at routine doses. We measured the mean...
Seiichi Yamamoto,Tatsuya Higashi,Michio Senda
Seiichi Yamamoto
A Gd2SiO5 (GSO) tweezers-type coincidence detector was developed and tested for tumor detection in procedures such as (18)F-fluorodeoxyglucose (FDG)-guided surgery. The detector consists of a pair of GSO scintillators, a pair of metal-packa...
Rie Tanaka,Hiroki Kawashima,Katsuhiro Ichikawa et al.
Rie Tanaka et al.
Real-time tumor tracking in external radiotherapy can be achieved by diagnostic (kV) X-ray imaging with a dynamic flat-panel detector (FPD). It is crucial to understand the effects of image lag for real-time tumor tracking. Our purpose in t...
Basic performance evaluation of a Si-PM array-based LGSO phoswich DOI block detector for a high-resolution small animal PET system [0.03%]
一种基于Si-PMT阵列的LGSO闪烁体DOI探测器的小动物高分辨PET性能研究
Seiichi Yamamoto
Seiichi Yamamoto
The silicon photomultiplier (Si-PM) is a promising photodetector for PET. However, it remains unclear whether Si-PM can be used for a depth-of-interaction (DOI) detector based on the decay time differences of the scintillator where pulse sh...
Evaluation of 4D dose to a moving target with Monte Carlo dose calculation in stereotactic body radiotherapy for lung cancer [0.03%]
立体定向体部放射治疗中采用蒙特卡洛剂量计算评估肺肿瘤移动靶区的体积剂量分布
Kiyotomo Matsugi,Mitsuhiro Nakamura,Yuki Miyabe et al.
Kiyotomo Matsugi et al.
We evaluated the four-dimensional (4D) dose to a moving target by a Monte Carlo dose calculation algorithm in stereotactic body radiation therapy (SBRT) planning based on the isocenter dose prescription. 4D computed tomography scans were pe...
Positional dependence of the CT number with use of a cone-beam CT scanner for an electron density phantom in particle beam therapy [0.03%]
锥形束CT模拟体在粒子束治疗中的电子密度依赖性_CT数值的部位变化分析研究
Yohsuke Kusano,Saki Uesaka,Kaori Yajima et al.
Yohsuke Kusano et al.
We evaluated the CT number accuracy in determining a CT calibration method for treatment planning by use of a 256 multi-slice CT (MSCT) scanner. An electron density phantom, which extends full length in the longitudinal direction, was scann...
Development of multi-planar dose verification by use of a flat panel EPID for intensity-modulated radiation therapy [0.03%]
用于调强放射治疗的平板EPID多平面剂量验证方法的发展研究
Yuji Nakaguchi,Fujio Araki,Tomohiro Kouno et al.
Yuji Nakaguchi et al.
Our purpose in this study was to evaluate the accuracy of a new multi-planar dose measurement method. The multi-planar dose distributions were reconstructed at each depth by convolution of EPID fluence and dose kernels with the use of EPIDo...