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Watanabe H, Kurabayashi T. Effects of differences in pixel size on image characteristics of digital intraoral radiographic systems: a physical and visual evaluation. Dentomaxillofac Radiol 2022; 51:20210093. [PMID: 34914543 PMCID: PMC8925879 DOI: 10.1259/dmfr.20210093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Hiroshi Watanabe
- Department of Oral and Maxillofacial Radiology, Graduate School of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tohru Kurabayashi
- Department of Oral and Maxillofacial Radiology, Graduate School of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
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Takarabe S, Kuramoto T, Shibayama Y, Tsuru H, Tatsumi M, Kato T, Okamura K, Yoshiura K. Effect of beam quality and readout direction in the edge profile on the modulation transfer function of photostimulable phosphor systems via the edge method. J Med Imaging (Bellingham) 2021; 8:043501. [PMID: 34307736 PMCID: PMC8291077 DOI: 10.1117/1.jmi.8.4.043501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Accepted: 06/28/2021] [Indexed: 11/14/2022] Open
Abstract
Purpose: The objective of this study was to investigate the effects of (i) the difference in the beam qualities on the presampled modulation transfer function (MTF) using the edge method and (ii) the readout direction of the edge profile for the photostimulable phosphor (PSP) system. Approach: The International Electrotechnical Commission (IEC) defined a technique using the "radiation qualities based on a phantom made up of an aluminum added filter" (RQA). A general radiographic system with a tube voltage of 50 kV and 9.7 mm of additional aluminum filtration was used to conform the x-ray to the IEC-specified beam quality definition RQA3. Additionally, we employed two different beams with tube voltages of 60 and 70 kV using a dental x-ray unit. The MTF was measured in the readout direction from low-to-high exposure regions and vice versa with respect to the scanning and subscanning directions of the PSP system. Results: The difference in the 50%MTF value for all directions between 60 and 70 kV averaged less than 0.05 . The 50%MTF of RQA3 was on average 0.2 lower than the value for 60 kV for each direction. For all beam qualities, no difference was observed between the MTFs measured in the readout direction from the low-to-high exposure regions and vice versa. Conclusions: The MTFs, measured using the dental x-ray unit, were unaffected by the tube voltage, and they were slightly higher than those measured using the RQA3. Furthermore, the MTF was unaffected by the differences in the readout directions of the edge profile.
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Affiliation(s)
- Shinya Takarabe
- Kyushu University Hospital, Division of Radiology, Department of Medical Technology, Fukuoka, Japan
- Kyushu University, Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Fukuoka, Japan
| | - Taku Kuramoto
- Kyushu University Hospital, Division of Radiology, Department of Medical Technology, Fukuoka, Japan
| | - Yusuke Shibayama
- Kyushu University Hospital, Division of Radiology, Department of Medical Technology, Fukuoka, Japan
| | - Hiroki Tsuru
- Kyushu University Hospital, Division of Radiology, Department of Medical Technology, Fukuoka, Japan
| | - Masato Tatsumi
- Kyushu University Hospital, Division of Radiology, Department of Medical Technology, Fukuoka, Japan
| | - Toyoyuki Kato
- Kyushu University Hospital, Division of Radiology, Department of Medical Technology, Fukuoka, Japan
| | - Kazutoshi Okamura
- Kyushu University, Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Fukuoka, Japan
| | - Kazunori Yoshiura
- Kyushu University, Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Fukuoka, Japan
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Kuramoto T, Takarabe S, Okamura K, Shiotsuki K, Shibayama Y, Tsuru H, Akamine H, Tatsumi M, Kato T, Morishita J, Yoshiura K. Effect of differences in pixel size on image characteristics of digital intraoral radiographic systems: a physical and visual evaluation. Dentomaxillofac Radiol 2020; 49:20190378. [PMID: 32302229 PMCID: PMC7461739 DOI: 10.1259/dmfr.20190378] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 04/09/2020] [Accepted: 04/15/2020] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVES To quantify and validate the effect of pixel size on a digital intraoral radiographic system according to International Electrotechnical Commission standards through physical and visual evaluations. METHODS The digital intraoral radiographic system used was the photostimulable phosphor imaging plate and scanner system. The system had three image capture modes: high-speed (HS), high-resolution (HR), and super high-resolution (SHR) with different pixels. The physical characteristics of the system were evaluated using presampled modulation transfer function (MTF) and the normalized noise power spectrum (NNPS). An aluminum (Al) step phantom with different depths of holes was used to acquire images under various exposure conditions. The average number of perceptible holes from all steps was plotted against each exposure dose. The results were compared to analyze the effects of pixel size on image quality of intraoral radiographs. RESULTS The MTF was slightly higher with SHR than with HR and HS. The NNPS with SHR showed about a 40% decrease in magnitude compared to HS. The total number of perceptible holes in the Al step phantom was higher with SHR than with HS and HR in all exposure conditions. CONCLUSIONS The MTF and NNPS obtained with different pixel size could be quantified by physical evaluation, and the differences were visually validated with Al step phantom. The SHR mode has the potential to decrease the radiation dose without compromising the image quality.
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Affiliation(s)
- Taku Kuramoto
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Shinya Takarabe
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kazutoshi Okamura
- Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kenshi Shiotsuki
- Medical Technology Department, Oita University Hospital, 1-1 Idaigaoka, Hasama-cho, Yufu-shi, Oita 879-5593, Japan
| | - Yusuke Shibayama
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroki Tsuru
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hiroshi Akamine
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Masato Tatsumi
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Toyoyuki Kato
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Junji Morishita
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kazunori Yoshiura
- Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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Nshimirimana R, Abraham A, Nothnagel G, Engelbrecht A. X-Ray and Neutron Radiography System Optimization by Means of a Multiobjective Approach and a Simplified Ray-Tracing Method. NUCL TECHNOL 2020. [DOI: 10.1080/00295450.2020.1740562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Robert Nshimirimana
- University of Pretoria, Department of Computer Science, Pretoria, South Africa
- South African Nuclear Energy Corporation SOC Ltd., Radiation Science Department, Brits Magisterial District, South Africa
| | - Ajith Abraham
- Machine Intelligence Research Labs (MIR Labs), Scientific Network for Innovation and Research Excellence, Auburn, Washington
| | - Gawie Nothnagel
- South African Nuclear Energy Corporation SOC Ltd., Radiation Science Department, Brits Magisterial District, South Africa
| | - Andries Engelbrecht
- University of Stellenbosch, Department of Industrial Engineering, Stellenbosch, South Africa
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Tsuda N, Tanaka N, Akasaka T, Yabuuchi H, Morishita J. Dose reduction in general radiography for adult patients by use of a dual-side-reading photostimulable phosphor plate in a computed radiography system. Radiol Phys Technol 2014; 7:310-5. [PMID: 24846451 DOI: 10.1007/s12194-014-0268-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 04/27/2014] [Accepted: 04/28/2014] [Indexed: 10/25/2022]
Abstract
Our purpose in this study was to evaluate the potential of dose reduction in general radiography for adult patients by use of a dual-side-reading (DSR) photostimulable phosphor plate in a computed radiography system. The image quality and low-contrast detectability in terms of the contrast-detail diagram of the DSR system with use of the X-ray beam quality of the RQA 5 defined by the International Electrotechnical Commission 61267 were compared with those of a conventional single-side-reading (SSR) system. The radiographic noise of the DSR system was lower compared to that of the SSR system under the same exposure conditions. Although there were no statistical differences in low-contrast detectabilities between the SSR system and the DSR system under the same exposure levels, the DSR system showed superior detectability compared to the SSR system. We conclude that the DSR system for general radiography has the potential to reduce the patient dose.
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Affiliation(s)
- Norisato Tsuda
- Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan,
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