Visualization of treatment response in tumors by use of dynamic contrast-enhanced magnetic resonance imaging [0.03%]
动态对比增强磁共振成像在肿瘤治疗反应可视化中的应用
Shohei Miyazaki,Kenya Murase,Yoshifumi Sugawara et al.
Shohei Miyazaki et al.
Our goal in this study was to present a method for generating functional parametric maps of hemodynamic parameters in tumors and a visualization method for assessing treatment response by use of dynamic contrast-enhanced magnetic resonance ...
Water-equivalent pathlength reproducibility due to respiratory pattern variation in charged-particle pancreatic radiotherapy [0.03%]
呼吸模式变化对带电粒子胰腺放射治疗水当量路径长度重复性的影响
Motoki Kumagai,Shinichiro Mori,Ryusuke Hara et al.
Motoki Kumagai et al.
We evaluated the water-equivalent length (WEL) reproducibility due to variation in the external respiratory marker position when using a 4DCT scan in respiratory-gated charged-particle treatment. Two sets of pancreatic 4DCT data from two pa...
Need for liquid-crystal display monitors having the capability of rendering higher than 8 bits in display-bit depth [0.03%]
一种能够显示超过8位的液晶显示器的需求
Takeshi Hiwasa,Junji Morishita,Shiro Hatanaka et al.
Takeshi Hiwasa et al.
Our purpose in this study was to examine the potential usefulness of liquid-crystal display (LCD) monitors having the capability of rendering higher than 8 bits in display-bit depth. An LCD monitor having the capability of rendering 8, 10, ...
Polarity effect in commercial ionization chambers used in photon beams with small fields [0.03%]
小射野光子束商用电离室的极化效应
Tetsunori Shimono,Kichiro Koshida,Hidekazu Nambu et al.
Tetsunori Shimono et al.
Ionization chambers are the instruments of choice for use in photon dosimetry. Ionization chambers together with radiographic films represent the best detectors for measurement of dose distribution for a quality assurance (QA) program in in...
Dosimetric verification in inhomogeneous phantom geometries for the XiO radiotherapy treatment planning system with 6-MV photon beams [0.03%]
用于XiO放射治疗计划系统的6MV光子束不均匀体模几何中的剂量检验
Ryosuke Kohno,Satoshi Kitou,Eriko Hirano et al.
Ryosuke Kohno et al.
We have developed a practical dose verification method for radiotherapy treatment planning systems by using only a Farmer ionization chamber in inhomogeneous phantoms. In particular, we compared experimental dose verifications of multi-laye...
Akihiro Osawa,Manabu Watanabe,Eiichi Sato et al.
Akihiro Osawa et al.
Currently, it is difficult to carry out refraction-contrast radiography by using a conventional X-ray generator. Thus, we developed an embossed radiography system utilizing dual-energy subtraction for decreasing the absorption contrast in u...
New protocol of myocardial SPECT imaging with technetium-99m sestamibi for reducing the time interval between rest and adenosine stress phases [0.03%]
一种新的99mTc-MIBI心肌SPECT显像减少静息与腺苷负荷间隔时间的心肌灌注方案
Hajime Monzen,Masatake Hara,Akira Nakanishi et al.
Hajime Monzen et al.
We have developed a new protocol of myocardial perfusion-gated single-photon emission computed tomography (SPECT), by use of technetium-99m sestamibi (MIBI), in which SPECT imaging at rest followed by SPECT imaging after adenosine with low ...
Imaging simulations of an "OpenPET" geometry with shifting detector rings [0.03%]
带有移动探测器环的"OpenPET"几何结构的图像仿真
Taiga Yamaya,Taku Inaniwa,Shinichiro Mori et al.
Taiga Yamaya et al.
We have proposed a new "OpenPET" geometry consisting of two detector rings of axial length W each separated by a gap G. For obtaining an axially continuous field of view (FOV) of 2W + G, the maximum limit for G must be W. However, two valle...
Evaluating the performance of a MOSFET dosimeter at diagnostic X-ray energies for interventional radiology [0.03%]
评估MOSFET剂量计在介入放射学诊断X射线能量下的性能
Koichi Chida,Youhei Inaba,Hanako Masuyama et al.
Koichi Chida et al.
For reducing the risk of skin injury during interventional radiology (IR) procedures, it has been suggested that physicians track patients' exposure doses. The metal-oxide semiconductor field effect transistor (MOSFET) dosimeter is designed...
Differentiation of hepatic tumors by use of image contrast with T2-weighted MRI [0.03%]
T2加权MRI对比度区分肝脏肿瘤的研究
Akio Ogura,Katsumi Hayakawa,Tosiaki Miyati et al.
Akio Ogura et al.
Differentiation of hepatic tumors is often evaluated in terms of qualitative diagnostic performance. The signal intensity patterns of hepatic masses are known to differ on certain T2-weighted imaging sequences. In this study, we investigate...