Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Nobukazu Tanaka Last modified date:2024.03.12

Assistant Professor / Department of Health Sciences / Faculty of Medical Sciences


Papers
1. Nobukazu Tanaka, Yongsu Yoon, Effect of anti‑scatter grids on the image improvement factor in digital radiography for various phantom thicknesses and irradiation fields, Physical and Engineering Sciences in Medicine, 46, 3, 1187-1192, 2023.09.
2. Yongsu Yoon, Hyemin Park, Jungmin Kim, Jungsu Kim, Younghoon Roh, Nobukazu Tanaka, Junji Morishita, Proper Management of the Clinical Exposure Index Based on Body Thickness Using Dose Optimization Tools in Digital Chest Radiography: A Phantom Study, International Journal of Environmental Research and Public Health, 18, 10, 5203 (10 pages), 2021.05.
3. Hyemin Park, Yongsu Yoon, Jungmin Kim, Jungsu Kim, Hoiwoun Jeong, Nobukazu Tanaka, Junji Morishita, Use of clinical exposure index and deviation index based on national diagnostic reference level as dose-optimization tools for general radiography in Korea, Radiation Protection Dosimetry, 191, 4, 439-451, 2020.11.
4. Nobukazu Tanaka, Hiroyuki Kuroyanagi, Combination system in advanced image processing for improving image contrast and a conventional row-ratio grid for an indirect flat-panel detector system: An experimental study, Physica Medica (European Journal of Medical Physics), 74, 40-46, 2020.06, Conventional grids with high grid ratios are not ideal for use in bedside radiography because of the difficulty in maintaining the required alignment. To address this issue, the potential usefulness of a combination system that employs removal processing software for scattered radiation and a conventional grid with a low grid ratio (3:1) for an indirect-conversion-type flat-panel detector system was evaluated by measuring image quality and observer performance. The hypothetical grid ratios for the software were 2:1, 3:1, 6:1, 8:1, and 10:1. The scatter fraction of the combination system was lower than that of the software alone. Significant improvement was observed in the effect of scattered radiation removal up to a hypothetical software grid ratio of 6:1. However, the Wiener spectrum increased (radiographic noise degraded) with an increase in the hypothetical grid ratio. The contrast ratios of the combination system were improved compared to those of the software alone for anthropomorphic chest radiographs. An observer test was also conducted using the contrast-detail phantom. The combination system indicated higher low-contrast detectability compared to the software alone, although there were no statistical differences between the hypothetical grid ratios of 6:1, 8:1, and 10:1 in all combinations of the software alone and the combination system. We concluded that a combination system with software that uses a hypothetical grid ratio of 6:1 or more and a 3:1 conventional grid would be more useful for reducing the scattered radiation component compared to the software alone with a hypothetical higher grid ratio for thicker objects..
5. Hyemin Park, Yongsu Yoon, Nobukazu Tanaka, Jungsu Kim, Jungmin Kim, Junji Morishita, Feasibility of displayed exposure index in IEC standard framework as a dose optimisation tool for digital radiography systems, Radiation Protection Dosimetry, 189, 3, 384-394, 2020.05.
6. Shogo Yasumatsu, Nobukazu Tanaka, Kensuke Iwase, Yoichiro Shimizu, Junji Morishita, Effect of X-ray beam quality on determination of exposure index, Radiological Physics and Technology, 9, 1, 109-115, 2016.01.
7. Yuki Yano, Hidetake Yabuuchi, Akemi Kairada, Nobukazu Tanaka, Junji Morishita, Tsutomu Akasaka, Yoshio Matsuo, Takeshi Kamitani, Yuzo Yamasaki, Michinobu Nagao, Masayuki Sasaki, Detectability of simulated interstitial pneumonia on chest radiographs: comparison between irradiation side sampling indirect flat-panel detector and computed radiography, The British Journal of Radiology, 87, 1040, 20140075 (6 pages), 2014.08.
8. Norisato Tsuda, Nobukazu Tanaka, Tsutomu Akasaka, Hidetake Yabuuchi, Junji Morishita, Dose reduction in general radiography for adult patients by use of a dual-side-reading photostimulable phosphor plate in a computed radiography system, Radiological Physics and Technology, 7, 2, 310-315, 2014.07.
9. Yuki Yano, Hidetake Yabuuchi, Nobukazu Tanaka, Junji Morishita, Tsutomu Akasaka, Yoshio Matsuo, Shunya Sunami, Takeshi Kamitani, Mikako Jinnouchi, Yuzo Yamasaki, Michinobu Nagao, Masayuki Sasaki, Detectability of simulated pulmonary nodules on chest radiographs: comparison between irradiation side sampling indirect flat-panel detector and computed radiography, European Journal of Radiology, 82, 11, 2050-2054, 2013.11.
10. Nobukazu Tanaka, Junji Morishita, Norisato Tsuda, Masafumi Ohki, Effect of readout direction in the edge profile on the modulation transfer function of computed radiographic systems by use of the edge method, Radiological Physics and Technology, 6, 2, 474-479, 2013.07.
11. Nobukazu Tanaka, Yuki Yano, Hidetake Yabuuchi, Tsutomu Akasaka, Masayuki Sasaki, Masafumi Ohki, Junji Morishita, Basic imaging properties of an indirect flat-panel detector system employing irradiation side sampling (ISS) technology for chest radiography: comparison with a computed radiographic system, Radiological Physics and Technology, 6, 1, 162-169, 2013.01.
12. Nobukazu Tanaka, Kentaro Naka, Aya Saito, Junji Morishita, Fukai Toyofuku, Masafumi Ohki, Yoshiharu Higashida, Investigation of optimum anti-scatter grid selection for digital radiography: physical imaging properties and detectability of low-contrast signals, Radiological Physics and Technology, 6, 1, 54-60, 2013.01.
13. Nobukazu Tanaka, Kentaro Naka, Hiroko Fukushima, Junji Morishita, Fukai Toyofuku, Masafumi Ohki, Yoshiharu Higashida, Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications, Radiological Physics and Technology, 4, 2, 156-163, 2011.07.