Prediction of back-scatter radiations to a beam monitor chamber of medical linear accelerators by use of the digitized target-current-pulse analysis method [0.03%]
数字脉冲电流法预测医用直线加速器中电离室探头的背散射剂量
Yusuke Suzuki,Naoki Hayashi,Hideki Kato et al.
Yusuke Suzuki et al.
In small-field irradiation, the back-scattered radiation (BSR) affects the counts measured with a beam monitor chamber (BMC). In general, the effect of the BSR depends on the opened-jaw size. The effect is significantly large in small-field...
A feasibility study on reduction of the entrance-surface dose to neonates by use of a new digital mobile X-ray system [0.03%]
新型数字移动X光系统降低新生儿人射面剂量的可行性研究
Satoru Utsunomiya,Hajime Monzen,Mami Akimoto et al.
Satoru Utsunomiya et al.
We investigated the neonatal entrance-surface dose (ESD) and doses of scattered radiation emitted by a digital mobile X-ray system. The system is equipped with a novel flat-panel detector and is used in the neonatal intensive care unit. In ...
Photon starvation artifacts of X-ray CT: their true cause and a solution [0.03%]
X射线CT中的光子匮乏伪影及其真正原因与解决方法
Issei Mori,Yoshio Machida,Makoto Osanai et al.
Issei Mori et al.
When too few photons reach detector elements, strong streaks appear through paths of high X-ray attenuation and an image becomes completely useless. This photon starvation artifact phenomenon occurs frequently when a pelvis or shoulder is s...
Effect of ambient lighting on liquid-crystal displays with different types of surface treatment [0.03%]
环境光对不同表面处理液晶显示器的影响
Michinobu Matsuyama,Junji Morishita,Hiroshi Akamine et al.
Michinobu Matsuyama et al.
Liquid-crystal displays (LCDs) with different types of surface treatment have been developed for decreasing the effect of ambient lighting on a displayed image. The effect of ambient lighting on LCDs with different surface treatments, namel...
An empirical mathematical model applied to quantitative evaluation of thioacetamide-induced acute liver injury in rats by use of dynamic contrast-enhanced computed tomography [0.03%]
动态对比剂增强CT定量评价硫化乙酰胺致急性肝损伤的数学模型及应用研究
Kenya Murase,Shuichiro Kobayashi,Akihiro Kitamura et al.
Kenya Murase et al.
Our purpose in this study was to apply an empirical mathematical model (EMM) to the quantitative evaluation of thioacetamide (TAA)-induced acute liver injury in rats by use of dynamic contrast-enhanced computed tomography (DCE-CT), and to i...
Dose calculation with a cone beam CT image in image-guided radiation therapy [0.03%]
基于影像引导放射治疗的锥形束CT图像剂量计算方法研究
Keisuke Usui,Yasunobu Ichimaru,Yasuhiro Okumura et al.
Keisuke Usui et al.
A kilo-voltage cone-beam CT (CBCT) attached to a linear accelerator can verify a target position in each radiation therapy. If CBCT images can be used in dose calculation, we can verify an actual dose distribution on every treatment day. Ho...
Effect of angular performance on the chromaticity of grayscale images displayed on medical liquid-crystal displays [0.03%]
视角性能对医学液晶显示器灰度图像色度影响的研究
Hiroshi Akamine,Junji Morishita,Michinobu Matsuyama et al.
Hiroshi Akamine et al.
Although variation of chromaticity in medical liquid-crystal displays (LCDs) has created interest in the quality assurance and quality control of display devices for medical use, it is unknown how chromaticity varies with the viewing angle....
Characteristics of diffusion-weighted stimulated echo pulse sequence in human skeletal muscle [0.03%]
人类骨骼肌扩散加权刺激回波脉冲序列的特点
Junichi Hata,Kazuo Yagi,Keigo Hikishima et al.
Junichi Hata et al.
The aim of our study was to simulate an effective diffusion-weighted imaging (DWI) pulse sequence and to evaluate the best b value in skeletal muscle. The evaluated pulse sequences were spin echo (SE), stimulated echo (STE), and gradient-re...
Minimum requirements for commissioning and long-term quality assurance of Elekta multi-leaf collimator for volumetric modulated arc therapy [0.03%]
体积调强弧形治疗的电子线多叶准直器的验收及长期质量保证的最低要求
Daisaku Tatsumi,Ryosei Nakada,Akane Yomoda et al.
Daisaku Tatsumi et al.
We have proposed minimum requirements for commissioning and long-term quality assurance (QA) of an Elekta multi-leaf collimator (MLC) for volumetric modulated arc therapy (VMAT). The MLC leaf position accuracy during VMAT delivery was evalu...
Optimal injection rate and volume of contrast medium for observing hemodynamics of a hepatocellular carcinoma structure model [0.03%]
肝细胞癌结构模型观察瘤体内血流动力学的对比剂最佳注射速率及用量
Kazuhiro Murotani,Nobuyuki Kawai,Morio Sato et al.
Kazuhiro Murotani et al.
This study aimed to identify the optimal concentration, injection rate, and total volume of contrast medium (CM) for evaluating the hemodynamics of a hepatocellular carcinoma (HCC) structure model of diameter 35 mm, using multi-level dynami...