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Yashima S, Chida K. Awareness of Medical Radiologic Technologists of Ionizing Radiation and Radiation Protection. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:ijerph20010497. [PMID: 36612833 PMCID: PMC9819470 DOI: 10.3390/ijerph20010497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/16/2022] [Accepted: 12/21/2022] [Indexed: 06/02/2023]
Abstract
Japanese people experienced the Hiroshima and Nagasaki atomic bombings, the Japan Nuclear Fuel Conversion Co. criticality accident, it was found that many human resources are needed to respond to residents' concerns about disaster exposure in the event of a radiation disaster. Medical radiologic technologists learn about radiation from the time of their training, and are engaged in routine radiographic work, examination explanations, medical exposure counseling, and radiation protection of staff. By learning about nuclear disasters and counseling, we believe they can address residents' concerns. In order to identify items needed for training, we examined the perceptions of medical radiologic technologists in the case of different specialties, modalities and radiation doses. In 2016, 5 years after the Fukushima Daiichi nuclear power plant accident, we conducted a survey of 57 medical radiologic technologists at two medical facilities with different specialties and work contents to investigate their attitudes toward radiation. 42 participants answered questions regarding sex, age group, presence of children, health effects of radiation exposure, radiation control, generation of X rays by diagnostic X ray equipment, and radiation related units. In a comparison of 38 items other than demographic data, 14 showed no significant differences and 24 showed significant differences. This study found that perceptions of radiation were different among radiology technologists at facilities with different specialties. The survey suggested the possibility of identifying needed training items and providing effective training.
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Affiliation(s)
- Sachiko Yashima
- Division of Radiation, Miyagi Cancer Society, Sendai 980-0011, Miyagi, Japan
- Division of Radiological Disasters and Medical Science, International Research Institute of Disaster Science (IRIDeS), Tohoku University, Sendai 980-8577, Miyagi, Japan
| | - Koichi Chida
- Division of Radiological Disasters and Medical Science, International Research Institute of Disaster Science (IRIDeS), Tohoku University, Sendai 980-8577, Miyagi, Japan
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Miyagi, Japan
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Matsunaga Y, Haba T, Kobayashi M, Suzuki S, Asada Y, Chida K. Evaluation of radiation dose for inferior vena cava filter placement during pregnancy: A comparison of dosimetry and dose calculation software. J Appl Clin Med Phys 2022; 24:e13884. [PMID: 36546565 PMCID: PMC9924124 DOI: 10.1002/acm2.13884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 11/21/2022] [Accepted: 11/30/2022] [Indexed: 12/24/2022] Open
Abstract
Numerous medical conditions are associated with pregnancy in women, including pulmonary thromboembolism, which can be fatal. An effective treatment of this condition is the positioning of an inferior vena cava filter (IVC-F) under the guidance of X-ray imaging. However, this procedure involves the risk of high radiation exposure to pregnant women and fetuses. Moreover, there are no published reports comparing the values of fetal dose, received during IVC-F placement in pregnant women, determined using dose calculation software and actual measurements. To address this issue, we compared the fetal radiation dose and entrance surface dose (ESD) for pregnant women for gestation periods of 6 and 9 months based on software calculations and actual measurements. The ESD and fetal doses were estimated for a pregnant woman for gestation periods of 6 and 9 months during IVC-F placement. For actual measurements, one pregnant model phantom was constructed using an anthropomorphic phantom, and two custom-made different-sized abdomen phantoms were used to simulate pregnancy. The custom-made abdomen phantoms were constructed using polyurethane. For software calculations, the software utilized a set of anatomically realistic pregnant patient phantoms. The ESD estimated using the software was consistent with the measured ESD, but the fetal dose estimations were more complicated due to fetal positioning. During fetal dose evaluation using software calculations, the user must carefully consider how much of the fetal length is in the irradiation field to prevent underestimation or overestimation. Despite the errors, the software can assist the user in identifying the magnitude of the dose approaching critical limits.
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Affiliation(s)
- Yuta Matsunaga
- Department of ImagingNagoya Kyoritsu HospitalNagoyaAichiJapan,Department of Radiological TechnologyFaculty of Health SciencesTohoku University Graduate School of MedicineSendaiMiyagiJapan
| | - Tomonobu Haba
- School of Health SciencesFujita Health UniversityToyoakeAichiJapan
| | | | - Shoichi Suzuki
- School of Health SciencesFujita Health UniversityToyoakeAichiJapan
| | - Yasuki Asada
- School of Health SciencesFujita Health UniversityToyoakeAichiJapan
| | - Koichi Chida
- Department of Radiological TechnologyFaculty of Health SciencesTohoku University Graduate School of MedicineSendaiMiyagiJapan
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Kawauchi S, Chida K, Moritake T, Hamada Y, Yoda S, Sakuma H, Tsuruta W, Matsumaru Y. Evaluation of Peak Skin Doses and Lens Doses during Interventional Neuroradiology Using a Direct Measurement System. JOURNAL OF NEUROENDOVASCULAR THERAPY 2022; 16:491-497. [PMID: 37502201 PMCID: PMC10370819 DOI: 10.5797/jnet.oa.2022-0024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 05/31/2022] [Indexed: 07/29/2023]
Abstract
Objective In interventional neuroradiology (INR), the evaluation of the peak skin dose (PSD) and lens dose is important because the patient radiation dose increases in cases in which the procedure is more difficult and complex. This study evaluated the radiation doses during INR procedures using a direct measurement system. Methods Radiation dose measurements during INR were performed in 332 patients with unruptured aneurysm (URAN), dural arteriovenous fistula (DAVF), and arteriovenous malformation (AVM). The PSD and bilateral lens doses were analyzed for each disease. The Pearson correlation test was used to determine whether the PSD and lens doses were linearly related to the reference air kerma (Ka,r). Results In all cases, the PSD and right and left lens doses were 2.36 ± 1.28 Gy, 114.2 ± 54.6 mGy, and 189.8 ± 160.3 mGy, respectively. The PSD and lens doses of the DAVF and AVM cases were significantly higher than those of the URAN case. The Pearson correlation test revealed statistically significant positive correlations between Ka,r and PSD, Ka,r and right lens dose, and Ka,r and left lens dose. Conclusion The characteristics of radiation dose in INR were clarified. Owing to the concern of increased radiation doses exceeding the threshold values in DAVF and AVM cases, protection from radiation is required. Simple regression analysis revealed the possibility of precisely predicting PSD using Ka,r.
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Affiliation(s)
- Satoru Kawauchi
- Department of Radiology, Toranomon Hospital, Tokyo, Japan
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
- Okinaka Memorial Institute for Medical Research, Tokyo, Japan
| | - Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan
| | - Takashi Moritake
- Department of Radiation Regulatory Science Research, National Institute of Radiological Sciences, National Institute for Quantum Science and Technology, Chiba, Chiba, Japan
| | - Yusuke Hamada
- Department of Radiology, Toranomon Hospital, Tokyo, Japan
| | - Shogo Yoda
- Department of Radiology, Toranomon Hospital, Tokyo, Japan
| | | | - Wataro Tsuruta
- Department of Endovascular Neurosurgery, Toranomon Hospital, Tokyo, Japan
| | - Yuji Matsumaru
- Division for Stroke Prevention and Treatment, Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
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Kozuma K, Chikamori T, Hashimoto J, Honye J, Ikeda T, Ishiwata S, Kato M, Kondo H, Matsubara K, Matsumoto K, Matsumoto N, Motoyama S, Obunai K, Sakamoto H, Soejima K, Suzuki S, Abe K, Amano H, Hioki H, Iimori T, Kawai H, Kosuge H, Nakama T, Suzuki Y, Takeda K, Ueda A, Yamashita T, Hirao K, Kimura T, Nagai R, Nakamura M, Shimizu W, Tamaki N. JCS 2021 Guideline on Radiation Safety in Cardiology. Circ J 2022; 86:1148-1203. [DOI: 10.1253/circj.cj-21-0379] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ken Kozuma
- Division of Cardiology, Teikyo University Hospital
| | | | - Jun Hashimoto
- Department of Radiology, Tokai University School of Medicine
| | - Junko Honye
- Department of Cardiology, Kikuna Memorial Hospital
| | - Takanori Ikeda
- Department of Cardiovascular Medicine, Toho University Faculty of Medicine
| | | | - Mamoru Kato
- Department of Radiology, Akita Cerebrospinal and Cardiovascular Center
| | | | - Kosuke Matsubara
- Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
| | - Kazuma Matsumoto
- Department of Radiological Technology, Hyogo College of Medicine College Hospital
| | | | | | | | - Hajime Sakamoto
- Department of Radiological Technology, Faculty of Health Science, Juntendo University
| | - Kyoko Soejima
- Department of Cardiology, Kyorin University Hospital
| | - Shigeru Suzuki
- Department of Radiology, Totsuka Kyouritsu Daini Hospital
| | - Koichiro Abe
- Department of Diagnostic Imaging and Nuclear Medicine, Tokyo Women's Medical University
| | - Hideo Amano
- Department of Cardiovascular Medicine, Toho University Faculty of Medicine
| | | | | | - Hideki Kawai
- Department of Cardiology, Fujita Health University
| | | | | | | | | | - Akiko Ueda
- Division of Advanced Arrhythmia Management, Kyorin University Hospital
| | | | - Kenzo Hirao
- Division of Cardiovascular Medicine, AOI Universal Hospital
| | - Takeshi Kimura
- Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine
| | - Ryozo Nagai
- Department of Cardiovascular Medicine, Jichi Medical University
| | - Masato Nakamura
- Division of Cardiovascular Medicine, Toho University Ohashi Medical Center
| | - Wataru Shimizu
- Department of Cardiovascular Medicine, Nippon Medical School
| | - Nagara Tamaki
- Department of Radiology, Kyoto Prefectural University of Medicine
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Yashima S, Chida K. Effective Risk Communications through Personalized Consultations with Pregnant Women and Parents by Radiologic Technologists after the 2011 Fukushima Daiichi Nuclear Disaster. TOHOKU J EXP MED 2022; 256:259-269. [PMID: 35264512 DOI: 10.1620/tjem.2022.j001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
| | - Koichi Chida
- International Research Institute of Disaster Science
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Matsunaga Y, Haba T, Kobayashi M, Suzuki S, Asada Y, Chida K. Fetal radiation dose of four tube voltages in abdominal CT examinations during pregnancy: A phantom study. J Appl Clin Med Phys 2021; 22:178-184. [PMID: 33449434 PMCID: PMC7882097 DOI: 10.1002/acm2.13171] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 10/29/2020] [Accepted: 12/17/2020] [Indexed: 11/05/2022] Open
Abstract
This study aimed to compare the dose and noise level of four tube voltages in abdominal computerized tomography (CT) examinations in different abdominal circumference sizes of pregnant women. Fetal radiation doses were measured with two anthropomorphic pregnant phantoms and real-time dosimeters of photoluminescence sensors using four tube voltages for abdominal CT. The noise level was measured at the abdomen of two anthropomorphic pregnant phantoms. In the large pregnant phantom, the mean fetal doses performed using 120 and 135 kV were statistically significantly lower than the lower tube voltages (P < 0.05). In the small pregnant phantom, the mean fetal dose performed by 100, 120, and 135 kV was significantly lower than the lowest tube voltage tested (P < 0.05). The ratios of the peripheral mean dose to the centric mean dose showed that the ratios of 80 kV were the highest and those for 135 kV were the lowest in both pregnant phantoms. The ratios of the peripheral mean dose to the centric mean dose decreased as the tube voltage increased. Compared with low tube voltages, high tube voltages such as 120 and 135 kV could reduce radiation doses to the fetus without compromising the image uniformity in abdominal CT examinations during pregnancy. On low tube voltage protocols, the dose near the maternal skin surface may be increased in large pregnant women because of reduced penetration of the x rays.
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Affiliation(s)
- Yuta Matsunaga
- Department of ImagingNagoya Kyoritsu HospitalNagoyaAichiJapan
- Department of Radiological TechnologyFaculty of Health SciencesTohoku University Graduate School of MedicineSendaiMiyagiJapan
| | - Tomonobu Haba
- School of Health SciencesFujita Health UniversityToyoakeAichiJapan
| | | | - Shoichi Suzuki
- School of Health SciencesFujita Health UniversityToyoakeAichiJapan
| | - Yasuki Asada
- School of Health SciencesFujita Health UniversityToyoakeAichiJapan
| | - Koichi Chida
- Department of Radiological TechnologyFaculty of Health SciencesTohoku University Graduate School of MedicineSendaiMiyagiJapan
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Tanaka T, Matsubara K, Kobayashi S. Evaluation of peak skin dose during percutaneous coronary intervention procedures: relationship with fluoroscopic pulse rate and target vessel. Radiol Phys Technol 2021; 14:34-40. [PMID: 33403510 DOI: 10.1007/s12194-020-00599-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 11/14/2020] [Accepted: 11/20/2020] [Indexed: 12/18/2022]
Abstract
This study aimed to evaluate the relationship between the peak skin dose (PSD) associated with radiation skin injury and the fluoroscopic pulse rate or target vessel during percutaneous coronary intervention (PCI) procedures. We consecutively included 213 patients who underwent PCI procedures. The fluoroscopic time (FT), total number of cine frames, reference air kerma (RAK), and PSD were compared between the two types of fluoroscopic pulse rates (10 and 7.5 pulses/s) and among target vessels. The total number of X-ray tube angulations for each target vessel was also investigated. The median FT was 21.5 min in the 10 pulses/s group and 19.4 min in the 7.5 pulses/s group (p = 0.068, Wilcoxon rank sum test). The median PSD in the 10 pulses/s group was 749 mGy, which was significantly higher than that in the 7.5 pulses/s group (549 mGy) (p < 0.001). The median RAK in the right coronary artery (RCA) was equivalent to that in the left anterior descending artery. However, among the target vessels, the median PSD tended to be the highest in the RCA. There was a difference in the X-ray tube angulation used depending on the target vessel. PCI in the RCA used the left anterior oblique angle more frequently than PCI in the other vessels and tended to use only one angulation. The calculated PSD was related to the target vessel of the PCI procedure, and it was also closely related to the X-ray tube angulation.
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Affiliation(s)
- Takuro Tanaka
- Department of Clinical Radiology, Tottori University Hospital, 36-1 Nishi-cho, Yonago, Tottori, 683-8504, Japan.
- Department of Quantum Medical Technology, Division of Health Sciences, Graduate School of Medical Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan.
| | - Kosuke Matsubara
- Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan
| | - Satoshi Kobayashi
- Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan
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Chida K, Kato M, Inaba Y, Kobayashi R, Nakamura M, Abe Y, Zuguchi M. Real-time patient radiation dosimeter for use in interventional radiology. Phys Med 2016; 32:1475-1478. [DOI: 10.1016/j.ejmp.2016.10.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/09/2016] [Accepted: 10/18/2016] [Indexed: 10/20/2022] Open
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