A comparison of shimming techniques for optimizing fat suppression in MR mammography [0.03%]
用于乳腺MR成像脂肪抑制的优化技术比较
Yasuo Takatsu,Kengo Nishiyama,Tosiaki Miyati et al.
Yasuo Takatsu et al.
We evaluated the degree of inhomogeneities of fat suppression using the fully automated three-dimensional breast shimming technique (Image Based-Smart: IB-Smart) and manual setting of a rectangular parallelepiped shim (volume shimming) in M...
Non-invasive speed of sound measurement in cartilage by use of combined magnetic resonance imaging and ultrasound: an initial study [0.03%]
结合磁共振和超声的软骨非侵入式速度测量：初步研究
Takako Aoki,Naotaka Nitta,Akira Furukawa
Takako Aoki
The speed of sound (SOS) is available as an index of elasticity. Using a combination of magnetic resonance imaging (MRI) and ultrasound, one can measure the SOS. In this study, we verified the accuracy of SOS measurements by using a combina...
The number of Japanese radiologic technologists will be increased in 40 years [0.03%]
日本放射技师的数量将在40年内增加
Miwa Araseki,Yuki Yokooka,Tomoki Ishikawa et al.
Miwa Araseki et al.
It is essential to predict the long-term supply and demand for the number of radiologic technologists as medical resources. However, it is difficult to predict the number of Japanese radiologic technologists due to complex and intertwining ...
Examination of the optimal temporal resolution required for computed tomography coronary angiography [0.03%]
评估CT冠状动脉造影的最佳时间分辨率需求
Kazuya Ohashi,Katsuhiro Ichikawa,Masaki Hara et al.
Kazuya Ohashi et al.
Sub-second multidetector-row computed tomography systems provide great potential for the further improvement of CT coronary angiography (CTCA). However, because the temporal resolution (TR) of such CT systems is insufficient, blurring and a...
Feasibility of MR perfusion-weighted imaging by use of a time-spatial labeling inversion pulse [0.03%]
基于时空标记反转脉冲的磁共振灌注加权成像可行性研究
Yoshiyuki Ishimori,Hiraku Kawamura,Masahiko Monma
Yoshiyuki Ishimori
Perfusion-weighted imaging (PWI) by use of arterial spin labeling (ASL) has been introduced to the clinical setting. However, it is not widely available because it requires specialized pulse sequences. Imaging using a time-spatial labeling ...
A revision of proton machine quality assurance for wobbled-proton-beam therapy [0.03%]
螺旋质子束治疗的质子设备质量控制规范修订意见
Yuki Kase,Haruo Yamashita,Masumi Numano et al.
Yuki Kase et al.
Periodic checks for proton machine quality assurance (QA) are significant for machine users safely and accurately to provide proton-beam treatment for cancer. Our aim in this study was to describe a revision to proton machine QA procedures ...
Accuracy validation of incident photon fluence on DQE for various measurement conditions and X-ray units [0.03%]
不同测量条件和X射线系统下的入射光子通量对DQE准确性的影响验证
Tomonobu Haba,Shimpei Kondo,Daiki Hayashi et al.
Tomonobu Haba et al.
Detective quantum efficiency (DQE) is widely used as a comprehensive metric for X-ray image evaluation in digital X-ray units. The incident photon fluence per air kerma (SNR²(in)) is necessary for calculating the DQE. The International Ele...
Whole-brain black-blood imaging with magnetization-transfer prepared spin echo-like contrast: a novel sequence for contrast-enhanced brain metastasis screening at 3T [0.03%]
一种新的序列在3特斯拉用于对比增強腦轉移瘤篩查：磁化轉移準備的类似自旋回波的全脑黑血成像
Masami Yoneyama,Masanobu Nakamura,Takashi Tabuchi et al.
Masami Yoneyama et al.
In contrast-enhanced (CE) brain metastasis screening, coexistence of enhanced blood vessel suppression and higher tumor-to-parenchyma contrast may improve radiologists' performances in detecting brain metastases compared with conventional s...
Microdosimetric calculation of penumbra for biological dose in wobbled carbon-ion beams with Monte Carlo Method [0.03%]
基于蒙特卡罗方法的扫描碳离子束笔形束剂量学计算研究
Mikoto Tamura,Masataka Komori,Hiroshi Oguchi et al.
Mikoto Tamura et al.
In carbon-ion radiotherapy, it is important to evaluate the biological dose because the relative biological effectiveness values vary greatly in a patient's body. The microdosimetric kinetic model (MKM) is a method of estimating the biologi...
Abdel Razzak Al-Hinnawi,Mohammed Daear,Said Huwaijah
Abdel Razzak Al-Hinnawi
A bilateral filter (BF) is a non-linear filter that has been proved to de-noise images without overrunning edges. Multi-slice computerized tomography (CT) may employ a BF to participate in dose reduction. This paper quantifies the role of t...