Radiological Physics and Technology

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Monte Carlo calculations of the replacement correction factor, P repl, for cylindrical chamber cavities in clinical photon and electron beams
Radiological Physics and Technology - Tập 5 - Trang 199-206 - 2012
Fujio Araki
The purpose of this study was to calculate the replacement correction factor, P repl (the product P gr P fl in the AAPM’s notation, or the product p cav p dis in the IAEA’s notation), at a reference depth, d ref, for cylindrical chamber cavities in clinical photon and ele...... hiện toàn bộ
Potential clinical impact of advanced imaging and computer-aided diagnosis in chest radiology: importance of radiologist’s role and successful observer study
Radiological Physics and Technology - Tập 8 - Trang 161-173 - 2015
Feng Li
This review paper is based on our research experience in the past 30 years. The importance of radiologists’ role is discussed in the development or evaluation of new medical images and of computer-aided detection (CAD) schemes in chest radiology. The four main topics include (1) introducing what diseases can be included in a research database for different imaging techniques or CAD systems and wha...... hiện toàn bộ
General equations for optimal selection of diagnostic image acquisition parameters in clinical X-ray imaging
Radiological Physics and Technology - Tập 10 Số 4 - Trang 415-421 - 2017
Xiaoming Zheng
Tooth detection for each tooth type by application of faster R-CNNs to divided analysis areas of dental panoramic X-ray images
Radiological Physics and Technology - Tập 15 - Trang 170-176 - 2022
Yuichi Mima, Ryohei Nakayama, Akiyoshi Hizukuri, Kan Murata
This study aimed to propose a computerized method for detecting the tooth region for each tooth type as the initial stage in the development of a computer-aided diagnosis (CAD) scheme for dental panoramic X-ray images. Our database consists of 160 panoramic dental X-ray images obtained from 160 adult patients. To reduce false positives (FPs), the proposed method first extracts a rectangular area i...... hiện toàn bộ
Polarity effect in commercial ionization chambers used in photon beams with small fields
Radiological Physics and Technology - Tập 2 Số 1 - Trang 97-103 - 2009
Shimono, Tetsunori, Koshida, Kichiro, Nambu, Hidekazu, Matsubara, Kosuke, Takahashi, Hiroshi, Okuda, Hiroshi
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 intensity-modulated radiotheraphy (IMRT). The polarity effect was investigated for seven different commercially available ionization chambers. This study concentr...... hiện toàn bộ
Voxel-based morphometry analysis of double inversion-recovery magnetic resonance imaging for detecting microscopic lesions: a simulation study
Radiological Physics and Technology - Tập 12 - Trang 149-155 - 2019
Sato Yusuke, Hayashi Norio, Maruyama Tomoko, Motegi Shunichi, Ujita Koichi, Suto Takayuki, Watanabe Haruyuki, Ogura Toshihiro, Ogura Akio, Tsushima Yoshito
Double inversion-recovery (DIR) imaging has the potential to improve the detection of subcortical lesions through the use of voxel-based morphometry (VBM) analysis. The aim of this study was to clarify the characteristics of detectable lesions by performing a VBM analysis on DIR images of simulated lesions. Twenty healthy volunteers underwent magnetic resonance imaging using a head three-dimension...... hiện toàn bộ
Computed tomography image representation using the Legendre polynomial and spherical harmonics functions
Radiological Physics and Technology - Tập 14 - Trang 113-121 - 2021
Taisei Shimomura, Akihiro Haga
The representation of computed tomography (CT) images using the Legendre polynomial (LPF) and spherical harmonics (SHF) functions was investigated. We selected 100 two-dimensional (2D) CT images of 10 lung cancer patients and 33 three-dimensional (3D) CT images of head and neck cancer patients. The reproducibility of these special functions was evaluated in terms of the normalized cross-correlatio...... hiện toàn bộ
Influence of the size of nano- and microparticles and photon energy on mass attenuation coefficients of bismuth–silicon shields in diagnostic radiology
Radiological Physics and Technology - Tập 12 - Trang 325-334 - 2019
Reza Malekzadeh, Parinaz Mehnati, Mohammad Yousefi Sooteh, Asghar Mesbahi
Recent studies have shown that the particle size of the shielding material and photon energy has significant effects on the efficiency of radiation-shielding materials. The purpose of the current study was to investigate the shielding properties of the bismuth–silicon (Bi–Si) composite containing varying percentages of micro- and nano-sized Bi particles for low-energy X-rays. Radiation composite s...... hiện toàn bộ
New image-restoration method using a simultaneous algebraic reconstruction technique: comparison with the Richardson–Lucy algorithm
Radiological Physics and Technology - Tập 13 Số 4 - Trang 365-377 - 2020
Kenya Murase
Acknowledgment
Radiological Physics and Technology - Tập 5 - Trang 277-277 - 2012
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