Deriving the modulation transfer function of CT from extremely noisy edge profiles [0.03%]
从极度噪声边缘轮廓中提取CT的调制传递函数
Issei Mori,Yoshio Machida
Issei Mori
The point spread function (PSF) method is currently the one predominantly used to determine the modulation transfer function (MTF) of an X-ray CT system. However, the image examined with the PSF method must have a very high contrast-to-nois...
Akihide Yamamoto,Hiroshi Sato,Jun-ichiro Enmi et al.
Akihide Yamamoto et al.
This study evaluated the feasibility of imaging rat brains using a human whole-body 3-T magnetic resonance imaging (MRI) scanner with specially developed transmit-and-receive radiofrequency coils. The T(1)- and T(2)-weighted images obtained...
George T Y Chen,Gregory C Sharp,Shinichiro Mori
George T Y Chen
Image-guided radiotherapy (IGRT) is in the midst of a strong development and implementation cycle, stimulated by pioneering work performed in Japan. We present a review of the rationale, technology, and methodology of image guidance, as wel...
Monte Carlo simulations of electron beams collimated with a dual electron multileaf collimator: a feasibility study [0.03%]
蒙特卡罗模拟双电子多叶准直器电子束的剂量分布：可行性研究
S O Inyang,A C Chamberlain
S O Inyang
Electron applicators and cut-outs have been used for some time in the delivery of electron beam therapy. A dual electron multileaf collimator (eMLC) consisting of upper and lower eMLCs was designed, and dose distributions of electron beams ...
Study of intra-abdominal fat distribution in sigmoid colon cancer in Japanese patients by use of MDCT data [0.03%]
利用多层螺旋CT数据分析日本结肠癌患者腹腔脂肪分布的规律性研究
Toshihiro Ogura,Tomohiro Tachikawa,Yoshiko Nishimura et al.
Toshihiro Ogura et al.
To assess the relationship between intra-abdominal fat and sigmoid colon cancer, we investigated the intra-abdominal fat distribution in 172 examples of sigmoid colon cancer and 767 examples of various other pathologies by using data from m...
An EGSnrc investigation of the air-kerma strength, dose rate constant, and radial dose function of 125I brachytherapy sources [0.03%]
EGSnrc在125I后装治疗放射源的空气比释动能强度、剂量率常数和径向剂量函数研究中应用
Sridhar Sahoo,T Palani Selvam
Sridhar Sahoo
Titanium-encapsulated (125)I brachytherapy sources are in use for treatment of the eye, brain, and head and neck region, and for early stage prostate cancer. The photoelectric interaction of (125)I photons with titanium encapsulation genera...
Feasibility study of near-infrared fluorescence tomography using a positron emission tomograph equipped with depth-of-interaction PET detectors [0.03%]
一种新型正电子发射断层显像仪的近红外荧光断层扫描可行性研究
Hideaki Tashima,Takashi Obi,Taiga Yamaya et al.
Hideaki Tashima et al.
We are currently developing an imaging system that combines simultaneous positron emission tomography (PET) with near-infrared (NIR) optical tomography, thus supporting two different types of molecular imaging. For this system, we are consi...
Investigation on the optimal position for the quantification of hepatic perfusion by use of dynamic contrast-enhanced computed tomography in rats [0.03%]
动态增强CT测定大鼠肝血流灌注定量的最佳位置研究
Shohei Miyazaki,Atsushi Tachibana,Akihiro Kitamura et al.
Shohei Miyazaki et al.
Our purpose in this study was to investigate the optimal position for the quantification of hepatic perfusion by using a dual-input, single-compartment model and dynamic contrast-enhanced computed tomography (DCE-CT) in rats. The DCE-CT stu...
Application of an artificial neural network to the computer-aided differentiation of focal liver disease in MR imaging [0.03%]
人工神经网络在磁共振成像中区分肝脏病变性质的应用研究
Xuejun Zhang,Masayuki Kanematsu,Hiroshi Fujita et al.
Xuejun Zhang et al.
The differentiation of focal liver lesions in magnetic resonance (MR) imaging is primarily based on the intensity and homogeneity of lesions with different imaging sequences. However, these imaging findings are falsely interpreted in some p...
Comparison of viewing angle and observer performances in different types of liquid-crystal display monitors [0.03%]
不同类型液晶显示器的视角及观察者性能比较
Shiro Hatanaka,Junji Morishita,Takeshi Hiwasa et al.
Shiro Hatanaka et al.
It is known that the performance of liquid-crystal display (LCD) monitors, such as the luminance and contrast ratio, is dependent on the viewing angle. Our purpose in this study was to compare the angular performance and the effect on obser...
Comparative Study
Radiological physics and technology. 2009 Jul;2(2):166-74. DOI:10.1007/s12194-009-0061-6 2009