Radiological Physics and Technology

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An empirical mathematical model applied to quantitative evaluation of thioacetamide-induced acute liver injury in rats by use of dynamic contrast-enhanced computed tomography
Radiological Physics and Technology - Tập 6 - Trang 115-120 - 2012
Kenya Murase, Shuichiro Kobayashi, Akihiro Kitamura, Taro Matsushita, Shigeyoshi Saito, Motoko Nishiura
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 investigate its usefulness in comparison with a dual-input, single-compartment model. The rats in the TAA-treated group were injected intravenously with 140 mg/k...... hiện toàn bộ
Simplified simulation of four-layer depth of interaction detector for PET
Radiological Physics and Technology - Tập 1 Số 1 - Trang 106-114 - 2008
Hideaki Haneishi, Masanobu Sato, Naoko Inadama, Hideo Murayama
Feasibility of MR perfusion-weighted imaging by use of a time-spatial labeling inversion pulse
Radiological Physics and Technology - Tập 6 - Trang 461-466 - 2013
Yoshiyuki Ishimori, Hiraku Kawamura, Masahiko Monma
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 inversion pulse (time-SLIP), which is a magnetic resonance angiography (MRA) technique that is based on ASL, can be used in various situations. In this study, w...... hiện toàn bộ
Effective-dose estimation in interventional radiological procedures
Radiological Physics and Technology - Tập 11 - Trang 149-155 - 2018
Maria D. Falco, Salvatore Masala, Matteo Stefanini, Paolo Bagalà, Daniele Morosetti, Eros Calabria, Alessia Tonnetti, Gianluca Verona-Rinati
Interventional radiology is based on minimally invasive procedures that allow diagnosis and percutaneous treatment of diseases in almost all organ systems. Such procedures have many benefits, but they also contribute significantly to collective radiation dose. In this regard, effective dose (E) is a convenient quantity to estimate patients’ stochastic radiation risk. However, E cannot be accuratel...... hiện toàn bộ
Linear attenuation coefficient and buildup factor of MCP-96 alloy for dose accuracy, beam collimation, and radiation protection
Radiological Physics and Technology - Tập 5 - Trang 229-236 - 2012
Deidre N. Hopkins, Muhammad Maqbool, Mohammed S. Islam
The linear attenuation coefficients and buildup factor of MCP-96 alloy were determined for 60Co, 54Mn, and 137Cs gamma emitters and a NaI detector. The thickness of the MCP-96 attenuator was varied from 1 to 4 cm. A collimated beam of gamma rays was allowed to pass through various thicknesses of the MCP-96 alloy. The attenuated beam was detected by a NaI detector, and data were recorded by a multi...... hiện toàn bộ
Traceable point-like 68Ge/68Ga source with a spherically symmetric positron absorber for PET scanners
Radiological Physics and Technology - Tập 13 - Trang 170-176 - 2020
Tomoyuki Hasegawa, Mio Okamoto, Takahiro Yamada, Hidetake Ishizu, Takahiro Mikamoto, Yasushi Sato, Hiroki Miyatake, Kei Kikuchi, Yusuke Inoue
A novel traceable point-like 68Ge/68Ga source was developed for calibration of positron emission tomography (PET) scanners. The source was equipped with a spherically symmetric acrylic positron absorber. The physical characteristics of photons emitted from the point-like source were evaluated by Monte Carlo simulation, considering possible geometrical uncertainties. The calibration factor of a cli...... hiện toàn bộ
Iterative image reconstruction that includes a total variation regularization for radial MRI
Radiological Physics and Technology - Tập 8 - Trang 295-304 - 2015
Shinya Kojima, Hiroyuki Shinohara, Takeyuki Hashimoto, Masami Hirata, Eiko Ueno
This paper presents an iterative image reconstruction method for radial encodings in MRI based on a total variation (TV) regularization. The algebraic reconstruction method combined with total variation regularization (ART_TV) is implemented with a regularization parameter specifying the weight of the TV term in the optimization process. We used numerical simulations of a Shepp–Logan phantom, as w...... hiện toàn bộ
Acknowledgment
Radiological Physics and Technology - Tập 7 Số 2 - Trang 391-391 - 2014
Fat-subtracted three-dimensional time-of-flight MR angiography of the neck by use of fat-only images with the two-point Dixon technique
Radiological Physics and Technology - Tập 8 Số 2 - Trang 193-199 - 2015
Yasuhiro Fujiwara, Yoshiyuki Ishimori, Isao Yamaguchi, Nobuyuki Kosaka, Hirohiko Kimura, Takuji Adachi
Development and evaluation of statistical shape modeling for principal inner organs on torso CT images
Radiological Physics and Technology - Tập 7 - Trang 277-283 - 2014
Xiangrong Zhou, Rui Xu, Takeshi Hara, Yasushi Hirano, Ryujiro Yokoyama, Masayuki Kanematsu, Hiroaki Hoshi, Shoji Kido, Hiroshi Fujita
The shapes of the inner organs are important information for medical image analysis. Statistical shape modeling provides a way of quantifying and measuring shape variations of the inner organs in different patients. In this study, we developed a universal scheme that can be used for building the statistical shape models for different inner organs efficiently. This scheme combines the traditional p...... hiện toàn bộ
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