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Kawauchi S, Chida K, Moritake T, Hamada Y, Tsuruta W. Radiation dose analysis in interventional neuroradiology of unruptured aneurysm cases. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2024; 44:031515. [PMID: 39226910 DOI: 10.1088/1361-6498/ad76b3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2024] [Accepted: 09/03/2024] [Indexed: 09/05/2024]
Abstract
This study aimed to evaluate the radiation doses (peak skin dose (PSD) and bilateral lens dose) for each interventional neuroradiology procedure. A direct measurement system consisting of small radiophotoluminescence glass dosimeter chips and a dosimetry cap made of thin stretchable polyester was used for radiation dosimetry. The mean PSDs for each procedure were 1565 ± 590 mGy (simple technique coil embolization (STCE) cases), 1851 ± 825 mGy (balloon-assisted coil embolization (BACE) cases), 2583 ± 967 mGy (stent-assisted coil embolization (SACE) cases), 1690 ± 597 mGy (simple flow-diverter stenting (FDS) cases), and 2214 ± 726 mGy (FDS + coiling cases). The mean PSD was higher in SACE cases than in STCE, BACE, and simple FDS cases. Moreover, the PSD exceeded 2000 mGy and 3000 mGy in 46 (67.6%) and 19 (27.9%) SACE cases, respectively. The left lens doses for each procedure were 126 ± 111 mGy (STCE cases), 163 ± 152 mGy (BACE cases), 184 ± 148 mGy (SACE cases), 144 ± 60 mGy (simple FDS cases), and 242 ± 178 mGy (FDS + coiling cases). The left lens dose in SACE cases was higher than that in STCE cases and exceeded 500 mGy in 3 (4.4%) patients. In FDS + coiling cases, the mean PSD and left lens dose were 2214 ± 726 mGy and 242 ± 178 mGy, respectively. The left lens dose was higher than that in the STCE and BACE cases, with two (15.4%) patients receiving doses >500 mGy in FDS + coiling cases. The detailed data obtained in this study are expected to contribute to the promotion of radiation dose optimization.
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Affiliation(s)
- Satoru Kawauchi
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo 105-8470, Japan
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku Sendai, Miyagi 980-8575, Japan
- Okinaka Memorial Institute for Medical Research, 2-2-2 Toranomon, Minato-ku, Tokyo 105-8470, Japan
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku Sendai, Miyagi 980-8575, Japan
| | - Takashi Moritake
- Department of Radiation Regulatory Science Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Yusuke Hamada
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo 105-8470, Japan
| | - Wataro Tsuruta
- Department of Endovascular Neurosurgery, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo 105-8470, Japan
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Sagehashi K, Haga Y, Takahira S, Tanabe M, Nakamura M, Sota M, Kaga Y, Abe M, Tada N, Chida K. Evaluation of radiation dose to the lens in interventional cardiology physicians before and after dose limit regulation changes. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2024; 44:031512. [PMID: 39142296 DOI: 10.1088/1361-6498/ad6f19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Accepted: 08/14/2024] [Indexed: 08/16/2024]
Abstract
In response to the International Commission on Radiological Protection, which lowered the lens equivalent dose limit, Japan lowered the lens dose limit from 150 mSv y-1to 100 mSv/5 years and 50 mSv y-1, with this new rule taking effect on 1 April 2021. DOSIRIS®is a dosimeter that can accurately measure lens dose. Herein, we investigated lens dose in interventional cardiology physicians 1 year before and after the reduction of the lens dose limit using a neck dosimeter and lens dosimeter measurements. With an increase in the number of cases, both personal dose equivalent at 0.07 mm depth [Hp(0.07), neck dosimeter] and personal dose equivalent at 3 mm depth [Hp(3), lens dosimeter] increased for most of the physicians. The Hp(3) of the lens considering the shielding effect of the Pb glasses using lens dosimeter exceeded 20 mSv y-1for two of the 14 physicians. Protection from radiation dose will become even more important in the future, as these two physicians may experience radiation dose exceeding 100 mSv/5 years. The average dose per procedure increased, but not significantly. There was a strong correlation between the neck dosimeter and lens dosimeter scores, although there was no significant change before and after the lens dose limit was lowered. This correlation was particularly strong for physicians who primarily treated patients. As such, it is possible to infer accurate lens doses from neck doses in physicians who primarily perform diagnostics. However, it is desirable to use a dosimeter that can directly measure Hp(3) because of the high lens dose.
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Affiliation(s)
- Kodai Sagehashi
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
| | - Yoshihiro Haga
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
- Department of Radiology, Sendai Kosei Hospital, 4-15, Hirose-Machi, Aoba-Ku, Sendai, Miyagi 980-0873, Japan
| | - Saki Takahira
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
| | - Mako Tanabe
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University, 468-1, Aoba, Aramaki, Aoba-Ku, Sendai, Miyagi 980-8572, Japan
| | - Mio Nakamura
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University, 468-1, Aoba, Aramaki, Aoba-Ku, Sendai, Miyagi 980-8572, Japan
| | - Masahiro Sota
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
- Department of Radiology, Sendai Kosei Hospital, 4-15, Hirose-Machi, Aoba-Ku, Sendai, Miyagi 980-0873, Japan
| | - Yuji Kaga
- Department of Radiology, Sendai Kosei Hospital, 4-15, Hirose-Machi, Aoba-Ku, Sendai, Miyagi 980-0873, Japan
| | - Mitsuya Abe
- Department of Radiology, Sendai Kosei Hospital, 4-15, Hirose-Machi, Aoba-Ku, Sendai, Miyagi 980-0873, Japan
| | - Norio Tada
- Department of Cardiovascular Medicine, Sendai Kousei Hospital, 4-15 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan
| | - Koichi Chida
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1, Seiryo-Machi, Aoba-Ku, Sendai, Miyagi 980-8575, Japan
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University, 468-1, Aoba, Aramaki, Aoba-Ku, Sendai, Miyagi 980-8572, Japan
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Khan MUA, Yi BJ. Real time eye dose reduction in fluoroscopy with auditory and visual feedback dosimeter through swine model experiments. Sci Rep 2024; 14:19319. [PMID: 39164306 PMCID: PMC11335762 DOI: 10.1038/s41598-024-66698-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Accepted: 07/03/2024] [Indexed: 08/22/2024] Open
Abstract
This paper proposes measurement and reduction of eye dose in real time for the physician and the assistant performing fluoroscopy guided arterial puncture. Eye dose rates were measured for 30 fluoroscopy-guided punctures of bilateral femoral arteries in pigs. Fifteen fluoroscopy-guided punctures were performed using real time radiation dosimeter without auditory and visual feedback and other fifteen punctures were done using real time radiation dosimeter with visual and auditory feedback worn on forehead by an interventional cardiologist having experience of more than 10 years. The mean radiation dose rate for eyes of physician during arterial puncturing with real time radiation dosimeter with auditory feedback was 0.07 mSv/h (n = 15) whereas it was 0.18 mSv/h (n = 15) without visual and auditory feedback. The percentage of reduction with the device was 61% for eyes. In case of assistant the reduction was 33% for eyes (n = 15). The real time visual and auditory feedback dosimeter has reduced the eye dose rate of the physician and assistant and also helped him staying away from the X-ray source. Real time radiation dosimeters can be an effective tool to measure and reduce the dose to the eyes. The radiation eye dose rate for physician and assistant was significantly reduced by using real time radiation dosimeter with visual and auditory feedback. The real time radiation dosimeter not only helps in measuring but also help in minimizing the radiation dose rate for the physician and assistant in real time.
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Affiliation(s)
- Muhammad Umair Ahmad Khan
- Department of Biomedical Engineering, University of Engineering and Technology (UET) Lahore (Narowal) Campus, Narowal, 51600, Pakistan
| | - Byung Ju Yi
- Department of Electronics Engineering, Hanyang University, Ansan, 15588, Korea.
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Matsunaga Y, Haba T, Kobayashi M, Suzuki S, Asada Y, Chida K. Assessment of fetal radiation exposure in pregnant women undergoing computed tomography and rotational angiography examinations for pelvic trauma. RADIATION PROTECTION DOSIMETRY 2024; 200:580-587. [PMID: 38486458 DOI: 10.1093/rpd/ncae058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/18/2024] [Accepted: 02/26/2024] [Indexed: 04/23/2024]
Abstract
This study aimed to assess fetal radiation exposure in pregnant women undergoing computed tomography (CT) and rotational angiography (RA) examinations for the diagnosis of pelvic trauma. In addition, this study aimed to compare the dose distributions between the two examinations. Surface and average fetal doses were estimated during CT and RA examinations using a pregnant phantom model and real-time dosemeters. The pregnant model phantom was constructed using an anthropomorphic phantom, and a custom-made abdominal phantom was used to simulate pregnancy. The total average fetal dose received by pregnant women from both CT scans (plain, arterial and equilibrium phases) and a single RA examination was ~60 mGy. Because unnecessary repetition of radiographic examinations, such as CT or conventional 2D angiography can increase the radiation risk, the irradiation range should be limited, if necessary, to reduce overall radiation exposure.
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Affiliation(s)
- Yuta Matsunaga
- Department of Imaging, Nagoya Kyoritsu Hospital, 1-172, Hokke, Nakagawa-ku, Nagoya, Aichi, Japan
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, Japan
| | - Tomonobu Haba
- Faculty of Radiological Technology, School of Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho,Toyoake, Aichi, Japan
| | - Masanao Kobayashi
- Faculty of Radiological Technology, School of Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho,Toyoake, Aichi, Japan
| | - Shoichi Suzuki
- Faculty of Radiological Technology, School of Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho,Toyoake, Aichi, Japan
| | - Yasuki Asada
- Faculty of Radiological Technology, School of Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho,Toyoake, Aichi, Japan
| | - Koichi Chida
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, Japan
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5
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Jin Z, Dong Z, Zhao X, Hang X, Lu Y, Zhang Q, Chen H, Huang Z, Wang Y, Zhou G, Chang L. Sensitive, rapid detection of NCOA4-m6A towards precisely quantifying radiation dosage on a Cas13a-Microdroplet platform. Biosens Bioelectron 2023; 242:115753. [PMID: 37839351 DOI: 10.1016/j.bios.2023.115753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/26/2023] [Accepted: 10/10/2023] [Indexed: 10/17/2023]
Abstract
Precise quantification of low-dose ionizing radiation is of great significance in protecting people from damage caused by clinical radiotherapy or environmental radiation. Traditional techniques for detecting radiation, however, remain extreme challenges to achieve high sensitivity and speed in quantifying radiation dosage. In this work, we report a Cas13a-Microdroplet platform that enables sensitive detection of ultra-low doses of radiation (0.5 Gy vs. 1 Gy traditional) within 1 h. The micro-platform adopts an ideal, specific radiation-sensitive marker, m6A on NCOA4 gene (NCOA4-m6A) that was first reported in our recent work. Microfluidics of the platform generate uniform microdroplets that encapsulate a CRISPR/Cas13a detection system and NCOA4-m6A target from the whole RNA extraction, achieving 10-fold enhancement in sensitivity and significantly reduced limit of detection (LOD). Systematic mouse models and clinical patient samples demonstrated its superior sensitivity and LOD (0.5 Gy) than traditional qPCR, which show wide potentials in radiation tracking and damage protection.
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Affiliation(s)
- Zhiyuan Jin
- Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
| | - Zaizai Dong
- School of Engineering Medicine, Beihang University, Beijing, 100191, China.
| | - Xi Zhao
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, 100850, China
| | - Xinxin Hang
- Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
| | - Yiming Lu
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, 100850, China; School of Life Science, University of Hebei, Baoding, 071002, China
| | - Qi Zhang
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, 100850, China; School of Medicine, University of South China, Hengyang, 421001, China
| | - Hongxia Chen
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, 100850, China
| | - Zhaocun Huang
- Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
| | - Yusen Wang
- Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
| | - Gangqiao Zhou
- State Key Laboratory of Proteomics, National Center for Protein Sciences at Beijing, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, 100850, China; School of Life Science, University of Hebei, Baoding, 071002, China; School of Medicine, University of South China, Hengyang, 421001, China; Collaborative Innovation Center for Personalized Cancer Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, 211166, China.
| | - Lingqian Chang
- Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China; School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Medical University, Hefei, 230032, China.
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Yamada A, Haga Y, Sota M, Abe M, Kaga Y, Inaba Y, Suzuki M, Tada N, Zuguchi M, Chida K. Eye Lens Radiation Dose to Nurses during Cardiac Interventional Radiology: An Initial Study. Diagnostics (Basel) 2023; 13:3003. [PMID: 37761370 PMCID: PMC10528633 DOI: 10.3390/diagnostics13183003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 09/12/2023] [Accepted: 09/15/2023] [Indexed: 09/29/2023] Open
Abstract
Although interventional radiology (IVR) is preferred over surgical procedures because it is less invasive, it results in increased radiation exposure due to long fluoroscopy times and the need for frequent imaging. Nurses engaged in cardiac IVR receive the highest lens radiation doses among medical workers, after physicians. Hence, it is important to measure the lens exposure of IVR nurses accurately. Very few studies have evaluated IVR nurse lens doses using direct dosimeters. This study was conducted using direct eye dosimeters to determine the occupational eye dose of nurses engaged in cardiac IVR, and to identify simple and accurate methods to evaluate the lens dose received by nurses. Over 6 months, in a catheterization laboratory, we measured the occupational dose to the eyes (3 mm dose equivalent) and neck (0.07 mm dose equivalent) of nurses on the right and left sides. We investigated the relationship between lens and neck doses, and found a significant correlation. Hence, it may be possible to estimate the lens dose from the neck badge dose. We also evaluated the appropriate position (left or right) of eye dosimeters for IVR nurses. Although there was little difference between the mean doses to the right and left eyes, that to the right eye was slightly higher. In addition, we investigated whether it is possible to estimate doses received by IVR nurses from patient dose parameters. There were significant correlations between the measured doses to the neck and lens, and the patient dose parameters (fluoroscopy time and air kerma), implying that these parameters could be used to estimate the lens dose. However, it may be difficult to determine the lens dose of IVR nurses accurately from neck badges or patient dose parameters because of variation in the behaviors of nurses and the procedure type. Therefore, neck doses and patient dose parameters do not correlate well with the radiation eye doses of individual IVR nurses measured by personal eye dosimeters. For IVR nurses with higher eye doses, more accurate measurement of the radiation doses is required. We recommend that a lens dosimeter be worn near the eyes to measure the lens dose to IVR nurses accurately, especially those exposed to relatively high doses.
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Affiliation(s)
- Ayumi Yamada
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
| | - Yoshihiro Haga
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan; (M.A.); (Y.K.)
| | - Masahiro Sota
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan; (M.A.); (Y.K.)
| | - Mitsuya Abe
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan; (M.A.); (Y.K.)
| | - Yuji Kaga
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan; (M.A.); (Y.K.)
| | - Yohei Inaba
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Masatoshi Suzuki
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Norio Tada
- Department of Cardiovascular Medicine, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan;
| | - Masayuki Zuguchi
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (A.Y.); (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
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Otomo K, Inaba Y, Abe K, Onodera M, Suzuki T, Sota M, Haga Y, Suzuki M, Zuguchi M, Chida K. Spatial Scattering Radiation to the Radiological Technologist during Medical Mobile Radiography. Bioengineering (Basel) 2023; 10:bioengineering10020259. [PMID: 36829753 PMCID: PMC9952711 DOI: 10.3390/bioengineering10020259] [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: 01/03/2023] [Revised: 02/08/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023] Open
Abstract
Mobile radiography allows for the diagnostic imaging of patients who cannot move to the X-ray examination room. Therefore, mobile X-ray equipment is useful for patients who have difficulty with movement. However, staff are exposed to scattered radiation from the patient, and they can receive potentially harmful radiation doses during radiography. We estimated occupational exposure during mobile radiography using phantom measurements. Scattered radiation distribution during mobile radiography was investigated using a radiation survey meter. The efficacy of radiation-reducing methods for mobile radiography was also evaluated. The dose decreased as the distance from the X-ray center increased. When the distance was more than 150 cm, the dose decreased to less than 1 μSv. It is extremely important for radiological technologists (RTs) to maintain a sufficient distance from the patient to reduce radiation exposure. The spatial dose at eye-lens height increases when the bed height is high, and when the RT is short in stature and abdominal imaging is performed. Maintaining sufficient distance from the patient is also particularly effective in limiting radiation exposure of the eye lens. Our results suggest that the doses of radiation received by staff during mobile radiography are not significant when appropriate radiation protection is used. To reduce exposure, it is important to maintain a sufficient distance from the patient. Therefore, RTs should bear this is mind during mobile radiography.
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Affiliation(s)
- Kazuki Otomo
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiology, Tohoku University Hospital, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan
| | - Yohei Inaba
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Keisuke Abe
- Department of Radiology, Tohoku University Hospital, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan
| | - Mana Onodera
- Department of Radiology, Tohoku University Hospital, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan
| | - Tomohiro Suzuki
- Department of Radiology, Tohoku University Hospital, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan
| | - Masahiro Sota
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai, 980-0873, Japan
| | - Yoshihiro Haga
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai, 980-0873, Japan
| | - Masatoshi Suzuki
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Masayuki Zuguchi
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
- Correspondence: ; Tel.: +81-22-717-7943
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8
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Modarai B, Haulon S, Ainsbury E, Böckler D, Vano-Carruana E, Dawson J, Farber M, Van Herzeele I, Hertault A, van Herwaarden J, Patel A, Wanhainen A, Weiss S, Esvs Guidelines Committee, Bastos Gonçalves F, Björck M, Chakfé N, de Borst GJ, Coscas R, Dias NV, Dick F, Hinchliffe RJ, Kakkos SK, Koncar IB, Kolh P, Lindholt JS, Trimarchi S, Tulamo R, Twine CP, Vermassen F, Document Reviewers, Bacher K, Brountzos E, Fanelli F, Fidalgo Domingos LA, Gargiulo M, Mani K, Mastracci TM, Maurel B, Morgan RA, Schneider P. Editor's Choice - European Society for Vascular Surgery (ESVS) 2023 Clinical Practice Guidelines on Radiation Safety. Eur J Vasc Endovasc Surg 2023; 65:171-222. [PMID: 36130680 DOI: 10.1016/j.ejvs.2022.09.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 09/15/2022] [Indexed: 01/24/2023]
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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 2023; 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] [MESH Headings] [Grants] [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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10
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Hattori K, Inaba Y, Kato T, Fujisawa M, Yasuno H, Yamada A, Haga Y, Suzuki M, Zuguchi M, Chida K. Evaluation of a New Real-Time Dosimeter Sensor for Interventional Radiology Staff. SENSORS (BASEL, SWITZERLAND) 2023; 23:512. [PMID: 36617110 PMCID: PMC9823962 DOI: 10.3390/s23010512] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/20/2022] [Accepted: 12/28/2022] [Indexed: 06/01/2023]
Abstract
In 2011, the International Commission on Radiological Protection (ICRP) recommended a significant reduction in the lens-equivalent radiation dose limit, thus from an average of 150 to 20 mSv/year over 5 years. In recent years, the occupational dose has been rising with the increased sophistication of interventional radiology (IVR); management of IVR staff radiation doses has become more important, making real-time radiation monitoring of such staff desirable. Recently, the i3 real-time occupational exposure monitoring system (based on RaySafeTM) has replaced the conventional i2 system. Here, we compared the i2 and i3 systems in terms of sensitivity (batch uniformity), tube-voltage dependency, dose linearity, dose-rate dependency, and angle dependency. The sensitivity difference (batch uniformity) was approximately 5%, and the tube-voltage dependency was <±20% between 50 and 110 kV. Dose linearity was good (R2 = 1.00); a slight dose-rate dependency (~20%) was evident at very high dose rates (250 mGy/h). The i3 dosimeter showed better performance for the lower radiation detection limit compared with the i2 system. The horizontal and vertical angle dependencies of i3 were superior to those of i2. Thus, i3 sensitivity was higher over a wider angle range compared with i2, aiding the measurement of scattered radiation. Unlike the i2 sensor, the influence of backscattered radiation (i.e., radiation from an angle of 180°) was negligible. Therefore, the i3 system may be more appropriate in areas affected by backscatter. In the future, i3 will facilitate real-time dosimetry and dose management during IVR and other applications.
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Affiliation(s)
- Kenshin Hattori
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Yohei Inaba
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Toshiki Kato
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Masaki Fujisawa
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Hikaru Yasuno
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Ayumi Yamada
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Yoshihiro Haga
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai 980-0873, Japan
| | - Masatoshi Suzuki
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Masayuki Zuguchi
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
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11
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Masubuchi Y, Chida K, Inaba Y, Kageyama M, Shimada S, Yamashita A. [Patient Radiation Dose for Percutaneous Coronary Intervention by Treatment Area: Dosimetry Using DRLs 2020]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2022; 78:1306-1313. [PMID: 36198569 DOI: 10.6009/jjrt.2022-1309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
PURPOSE Skin injury in patients due to radiation exposure has been a complication in percutaneous coronary intervention (PCI) for a long time. To the best of our knowledge, there have been no reports comparing radiation dose by treatment area with diagnostic reference levels (DRLs) 2020, although the radiation dose varies by treatment area in PCI. METHODS In this study, the treatment areas were classified into four segments (i.e., AHA #1-3, AHA #4, AHA #5-10, and AHA #11-15), and each segment was compared with DRLs 2020. This retrospective study included 984 consecutive patients with single-vessel disease and non-chronic total occlusion. PCI was performed on a single device. RESULTS The median radiation dose was 1640.8 mGy, and the radiation dose for AHA #4 was 2732.0 mGy, which was significantly higher than the other treatment areas (p<0.001). In AHA #4, the radiation dose increased due to the heavy use of the left cranial view, and the patient background contributed to the increased lesion complexity. Therefore, it was challenging to evaluate AHA #4 and the other treatment areas with a uniform DRL value. CONCLUSION Establishing a subdivided index for each treatment area is crucial if DRLs are used as a reference during procedures and as a guide for dose optimization.
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Affiliation(s)
- Yusuke Masubuchi
- Department of Radiology, Nasu Red Cross Hospital
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine
| | - Koichi Chida
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University
| | - Yohei Inaba
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University
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12
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Portugal M, Baptista M, Vaz P, Belchior A. Patients’ organ dose and risk assessment in interventional cardiology procedures. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Sato T, Eguchi Y, Yamazaki C, Hino T, Saida T, Chida K. Development of a New Radiation Shield for the Face and Neck of IVR Physicians. Bioengineering (Basel) 2022; 9:354. [PMID: 36004878 PMCID: PMC9404996 DOI: 10.3390/bioengineering9080354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 07/20/2022] [Accepted: 07/23/2022] [Indexed: 11/20/2022] Open
Abstract
Interventional radiology (IVR) procedures are associated with increased radiation exposure and injury risk. Furthermore, radiation eye injury (i.e., cataract) in IVR staff have also been reported. It is crucial to protect the eyes of IVR physicians from X-ray radiation exposure. Many IVR physicians use protective Pb eyeglasses to reduce occupational eye exposure. However, the shielding effects of Pb eyeglasses are inadequate. We developed a novel shield for the face (including eyes) of IVR physicians. The novel shield consists of a neck and face guard (0.25 mm Pb-equivalent rubber sheet, nonlead protective sheet). The face shield is positioned on the left side of the IVR physician. We assessed the shielding effects of the novel shield using a phantom in the IVR X-ray system; a radiophotoluminescence dosimeter was used to measure the radiation exposure. In this phantom study, the effectiveness of the novel device for protecting against radiation was greater than 80% in almost all measurement situations, including in terms of eye lens exposure. A large amount of scattered radiation reaches the left side of IVR physicians. The novel radiation shield effectively protects the left side of the physician from this scattered radiation. Thus, the device can be used to protect the face and eyes of IVR physicians from occupational radiation exposure. The novel device will be useful for protecting the face (including eyes) of IVR physicians from radiation, and thus could reduce the rate of radiation injury. Based on the positive results of this phantom study, we plan to perform a clinical experiment to further test the utility of this novel radiation shield for IVR physicians.
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Affiliation(s)
- Toshimitsu Sato
- Department of Radiology, Yamagata University Hospital, 2-2-2 Iida-nishi, Yamagata 990-9585, Japan; (T.S.); (C.Y.); (T.H.)
| | - Yoichi Eguchi
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Sendai 980-8575, Japan;
| | - Chika Yamazaki
- Department of Radiology, Yamagata University Hospital, 2-2-2 Iida-nishi, Yamagata 990-9585, Japan; (T.S.); (C.Y.); (T.H.)
| | - Takanobu Hino
- Department of Radiology, Yamagata University Hospital, 2-2-2 Iida-nishi, Yamagata 990-9585, Japan; (T.S.); (C.Y.); (T.H.)
| | - Toshikazu Saida
- Department of Central Radiology, Nara Prefecture Seiwa Medical Center, 1-14-16 Mimuro, Nara 636-0802, Japan;
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Sendai 980-8575, Japan;
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Sendai 980-0845, Japan
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14
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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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15
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Chida K. What are useful methods to reduce occupational radiation exposure among radiological medical workers, especially for interventional radiology personnel? Radiol Phys Technol 2022; 15:101-115. [PMID: 35608759 DOI: 10.1007/s12194-022-00660-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 04/20/2022] [Accepted: 04/20/2022] [Indexed: 11/24/2022]
Abstract
Protection against occupational radiation exposure in clinical settings is important. This paper clarifies the present status of medical occupational exposure protection and possible additional safety measures. Radiation injuries, such as cataracts, have been reported in physicians and staff who perform interventional radiology (IVR), thus, it is important that they use shielding devices (e.g., lead glasses and ceiling-suspended shields). Currently, there is no single perfect radiation shield; combinations of radiation shields are required. Radiological medical workers must be appropriately educated in terms of reducing radiation exposure among both patients and staff. They also need to be aware of the various methods available for estimating/reducing patient dose and occupational exposure. When the optimizing the dose to the patient, such as eliminating a patient dose that is higher than necessary, is applied, exposure of radiological medical workers also decreases without any loss of diagnostic benefit. Thus, decreasing the patient dose also reduces occupational exposure. We propose a novel four-point policy for protecting medical staff from radiation: patient dose Optimization, Distance, Shielding, and Time (pdO-DST). Patient dose optimization means that the patient never receives a higher dose than is necessary, which also reduces the dose received by the staff. The patient dose must be optimized: shielding is critical, but it is only one component of protection from radiation used in medical procedures. Here, we review the radiation protection/reduction basics for radiological medical workers, especially for IVR staff.
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Affiliation(s)
- Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai, 980-8575, Japan. .,Division of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai, 980-8572, Japan.
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16
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Radiation Eye Dose for Physicians in CT Fluoroscopy-Guided Biopsy. Tomography 2022; 8:438-446. [PMID: 35202201 PMCID: PMC8878526 DOI: 10.3390/tomography8010036] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 01/29/2022] [Accepted: 02/02/2022] [Indexed: 01/29/2023] Open
Abstract
It is important to evaluate the radiation eye dose (3 mm dose equivalent, Hp (3)) received by physicians during computed tomography fluoroscopy (CTF)-guided biopsy, as physicians are close to the source of scattered radiation. In this study, we measured the radiation eye dose in Hp (3) received by one physician during CTF in a timeframe of 18 months using a direct eye dosimeter, the DOSIRISTM. The physician placed eye dosimeters above and under their lead (Pb) eyeglasses. We recorded the occupational radiation dose received using a neck dosimeter, gathered CT dose-related parameters (e.g., CT-fluoroscopic acquisition number, CT-fluoroscopic time, and CT-fluoroscopic mAs), and performed a total of 95 procedures during CTF-guided biopsies. We also estimated the eye dose (Hp (3)) received using neck personal dosimeters and CT dose-related parameters. The physician eye doses (right and left side) received in terms of Hp (3) without the use of Pb eyeglasses for 18 months were 2.25 and 2.06 mSv, respectively. The protective effect of the Pb eyeglasses (0.5 mm Pb) on the right and left sides during CTF procedures was 27.8 and 37.5%, respectively. This study proved the existence of significant correlations between the eye and neck dose measurement (right and left sides, R2 = 0.82 and R2 = 0.55, respectively) in physicians. In addition, we found significant correlations between CT-related parameters, such as CT-fluoroscopy mAs, and radiation eye doses (right and left sides, R2 = 0.50 and R2 = 0.52, respectively). The eye dose of Hp (3) received in CTF was underestimated when evaluated using neck dosimeters. Therefore, we suggest that the physician involved in CTF use a direct eye dosimeter such as the DOSIRIS for the accurate evaluation of their eye lens dose.
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Kawauchi S, Chida K, Hamada Y, Tsuruta W. Lens dose reduction with a bismuth shield in neuro cone-beam computed tomography: an investigation on optimum shield device placement conditions. Radiol Phys Technol 2021; 15:25-36. [PMID: 34796447 DOI: 10.1007/s12194-021-00644-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/08/2021] [Accepted: 11/09/2021] [Indexed: 11/26/2022]
Abstract
This study aimed to determine the placement distance, number, and position of the bismuth shield for developing a lens protective device for cone-beam computed tomography (CBCT). To determine the dose reduction rate, the lens doses were measured using an anthropomorphic head phantom and a real-time dosimeter. The image quality assessment was determined by analyzing the change in the pixel value, caused by the bismuth shield, and the artifact index was calculated from the pixel value and image noise within various regions of interest in the head phantom. When the distance between the bismuth shield and the subject was increased, the image quality deteriorated less, but there was also a decrease in the lens dose reduction rate. Upon changing the number of bismuth shields from 1-ply to 2-ply, the dose reduction rate increased; however, there was a decrease in the image quality. Additionally, placing the bismuth shield outside of the subject improved the dose reduction rate without deteriorating the image quality. The optimum placement conditions of the bismuth shield were concluded as follows: positioned outside, placed 10 mm from the surface of the subject, and used a 1-ply bismuth shield. When these placement conditions were used, the lens dose reduction rate was 26.9 ± 0.36% (right-left average) for the "bismuth shield: separate". The protective device developed in this study will contribute to radiation dose reduction in CBCT scans.
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Affiliation(s)
- Satoru Kawauchi
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan.
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai, Miyagi, 980-8575, Japan.
- Okinaka Memorial Institute for Medical Research, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan.
| | - Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
| | - Yusuke Hamada
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan
| | - Wataro Tsuruta
- Department of Endovascular Neurosurgery, Toranomon Hospital, 2-2-2 Toranomon, Minato-ku, Tokyo, 105-8470, Japan
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18
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Kato M, Chida K, Munehisa M, Sato T, Inaba Y, Suzuki M, Zuguchi M. Non-Lead Protective Aprons for the Protection of Interventional Radiology Physicians from Radiation Exposure in Clinical Settings: An Initial Study. Diagnostics (Basel) 2021; 11:1613. [PMID: 34573955 PMCID: PMC8469807 DOI: 10.3390/diagnostics11091613] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 01/08/2023] Open
Abstract
Radiation protection/evaluation during interventional radiology (IVR) poses a very important problem. Although IVR physicians should wear protective aprons, the IVR physician may not tolerate wearing one for long procedures because protective aprons are generally heavy. In fact, orthopedic problems are increasingly reported in IVR physicians due to the strain of wearing heavy protective aprons during IVR. In recent years, non-Pb protective aprons (lighter weight, composite materials) have been developed. Although non-Pb protective aprons are more expensive than Pb protective aprons, the former aprons weigh less. However, whether the protective performance of non-Pb aprons is sufficient in the IVR clinical setting is unclear. This study compared the ability of non-Pb and Pb protective aprons (0.25- and 0.35-mm Pb-equivalents) to protect physicians from scatter radiation in a clinical setting (IVR, cardiac catheterizations, including percutaneous coronary intervention) using an electric personal dosimeter (EPD). For radiation measurements, physicians wore EPDs: One inside a personal protective apron at the chest, and one outside a personal protective apron at the chest. Physician comfort levels in each apron during procedures were also evaluated. As a result, performance (both the shielding effect (98.5%) and comfort (good)) of the non-Pb 0.35-mm-Pb-equivalent protective apron was good in the clinical setting. The radiation-shielding effects of the non-Pb 0.35-mm and Pb 0.35-mm-Pb-equivalent protective aprons were very similar. Therefore, non-Pb 0.35-mm Pb-equivalent protective aprons may be more suitable for providing radiation protection for IVR physicians because the shielding effect and comfort are both good in the clinical IVR setting. As non-Pb protective aprons are nontoxic and weigh less than Pb protective aprons, non-Pb protective aprons will be the preferred type for radiation protection of IVR staff, especially physicians.
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Affiliation(s)
- Mamoru Kato
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (M.K.); (Y.I.); (M.S.); (M.Z.)
- Akita Cerebrospinal and Cardiovascular Center (Akita Medical Center), 6–10 Senshu-Kubota Machi, Akita 010-0874, Japan; (M.M.); (T.S.)
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (M.K.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Masato Munehisa
- Akita Cerebrospinal and Cardiovascular Center (Akita Medical Center), 6–10 Senshu-Kubota Machi, Akita 010-0874, Japan; (M.M.); (T.S.)
- Department of Cardiovascular Medicine, Senseki Hospital, 53-7 Akai, Aza Dai, Higashi Matsushima 981-0501, Japan
| | - Tadaya Sato
- Akita Cerebrospinal and Cardiovascular Center (Akita Medical Center), 6–10 Senshu-Kubota Machi, Akita 010-0874, Japan; (M.M.); (T.S.)
- Department of Cardiovascular Medicine, Saka General Hospital, 16-5 Nishiki-machi, Shiogama 985-8506, Japan
| | - Yohei Inaba
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (M.K.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Masatoshi Suzuki
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (M.K.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan
| | - Masayuki Zuguchi
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan; (M.K.); (Y.I.); (M.S.); (M.Z.)
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19
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Matsunaga Y, Haba T, Kobayashi M, Suzuki S, Asada Y, Chida K. Novel pregnant model phantoms for measurement of foetal radiation dose in x-ray examinations. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2021; 41:N12-N21. [PMID: 34233314 DOI: 10.1088/1361-6498/ac125c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 07/07/2021] [Indexed: 06/13/2023]
Abstract
This study presents a comparison of novel pregnant model phantoms with a handmade phantom in terms of shape and radiation measurement points to determine which model is more suitable for measuring the foetal radiation dose during x-ray examinations. Novel pregnant model phantoms were constructed using an anthropomorphic phantom in combination with two differently-sized custom-made abdomen phantoms simulating pregnancy, which were constructed from a polyurethane resin. The size and shape of the polyurethane resin were designed based on abdominal sizes and shapes collected from the computed tomography examinations at 18 pregnant patients of one hospital. The handmade pregnant model phantom was constructed using an anthropomorphic phantom and a beach ball containing water. Compared with the handmade phantom, there were additional dose measurement points on the novel pregnant model phantoms. Our model phantoms improved upon the handmade phantom in terms of shape and radiation measurement points. We produced pregnant model phantoms that simulated the shapes and sizes of actual patients for the first time.
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Affiliation(s)
- Yuta Matsunaga
- Department of Imaging, Nagoya Kyoritsu Hospital, 1-172, Hokke, Nakagawa-ku, Nagoya, Aichi, Japan
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, Japan
| | - Tomonobu Haba
- Faculty of Radiological Technology, School of Health Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan
| | - Masanao Kobayashi
- Faculty of Radiological Technology, School of Health Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan
| | - Shoichi Suzuki
- Faculty of Radiological Technology, School of Health Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan
| | - Yasuki Asada
- Faculty of Radiological Technology, School of Health Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, Japan
| | - Koichi Chida
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, Japan
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Endo M, Haga Y, Sota M, Tanaka A, Otomo K, Murabayashi Y, Abe M, Kaga Y, Inaba Y, Suzuki M, Meguro T, Chida K. Evaluation of novel X-ray protective eyewear in reducing the eye dose to interventional radiology physicians. JOURNAL OF RADIATION RESEARCH 2021; 62:414-419. [PMID: 33839782 PMCID: PMC8127654 DOI: 10.1093/jrr/rrab014] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/17/2020] [Indexed: 05/28/2023]
Abstract
The new recommendation of the International Commission on Radiological Protection for occupational eye dose is an equivalent dose limit to the eye of 20 mSv year-1, averaged over a 5-year period. This recommendation is a drastic reduction from the previous limit of 150 mSv year-1. Hence, it is important to protect physicians' eyes from X-ray radiation. Particularly in interventional radiology (IVR) procedures, many physicians use protective lead (Pb) glasses to reduce their occupational exposure. This study assessed the shielding effects of novel 0.07 mm Pb glasses. The novel glasses (XR-700) have Pb-acrylic lens molded in three dimensions. We studied the novel type of 0.07 mm Pb glasses over a period of seven consecutive months. The eye dose occupational radiation exposure of seven IVR physicians was evaluated during various procedures. All IVR physicians wore eye dosimeters (DOSIRIS™) close to the left side of the left eye. To calculate the shielding effects of the glasses, this same type of eye dosimeter was worn both inside and outside of the Pb lenses. The average shielding effect of the novel glasses across the seven physicians was 61.4%. Our results suggest an improved shielding effect for IVR physicians that use these glasses. No physician complained that the new glasses were uncomfortable; therefore comfort is not a problem. The lightweight glasses were acceptable to IVR physicians, who often must perform long procedures. Thus, the novel glasses are comfortable and reasonably protective. Based on the results of this study, we recommend that IVR physicians use these novel 0.07 mm Pb glasses to reduce their exposure.
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Affiliation(s)
- Mime Endo
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Yoshihiro Haga
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital ,
Hirosemachi 4-15, Aobaku, Sendai 980-0873, Japan
| | - Masahiro Sota
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital ,
Hirosemachi 4-15, Aobaku, Sendai 980-0873, Japan
| | - Akiko Tanaka
- Department of Cardiovascular Medicine, Sendai Kousei
Hospital , Hirosemachi 4-15, Aobaku, Sendai 980-0873, Japan
| | - Kazuki Otomo
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Yuuki Murabayashi
- Division of Disaster Medicine, International Research Institute of
Disaster Science, Tohoku University , 6-6-4 Aoba, Sendai 980-8579,
Japan
| | - Mitsuya Abe
- Department of Radiology, Sendai Kousei Hospital ,
Hirosemachi 4-15, Aobaku, Sendai 980-0873, Japan
| | - Yuji Kaga
- Department of Radiology, Sendai Kousei Hospital ,
Hirosemachi 4-15, Aobaku, Sendai 980-0873, Japan
| | - Yohei Inaba
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Disaster Medicine, International Research Institute of
Disaster Science, Tohoku University , 6-6-4 Aoba, Sendai 980-8579,
Japan
| | - Msatoshi Suzuki
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Disaster Medicine, International Research Institute of
Disaster Science, Tohoku University , 6-6-4 Aoba, Sendai 980-8579,
Japan
| | - Taiichiro Meguro
- Department of Cardiovascular Medicine, Sendai Kousei
Hospital , Hirosemachi 4-15, Aobaku, Sendai 980-0873, Japan
| | - Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate
School of Medicine , 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Disaster Medicine, International Research Institute of
Disaster Science, Tohoku University , 6-6-4 Aoba, Sendai 980-8579,
Japan
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Radioprotection of eye lens using protective material in neuro cone-beam computed tomography: Estimation of dose reduction rate and image quality. Phys Med 2021; 82:192-199. [PMID: 33647602 DOI: 10.1016/j.ejmp.2021.02.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 01/02/2021] [Accepted: 02/07/2021] [Indexed: 11/22/2022] Open
Abstract
PURPOSE In cerebral angiography, for diagnosis and interventional neuroradiology, cone-beam computed tomography (CBCT) scan is frequently performed for evaluating brain parenchyma, cerebral hemorrhage, and cerebral infarction. However, the patient's eye lens is more frequently exposed to excessive doses in these scans than in the previous angiography and interventional neuroradiology (INR) procedures. Hence, radioprotection for the lenses is needed. This study selects the most suitable eye lens protection material for CBCT from among nine materials by evaluating the dose reduction rate and image quality. METHODS To determine the dose reduction rate, the lens doses were measured using an anthropomorphic head phantom and a real-time dosimeter. For image quality assessment, the artifact index was calculated based on the pixel value and image noise within various regions of interest in a water phantom. RESULTS The protective materials exhibited dose reduction; however, streak artifacts were observed near the materials. The dose reduction rate and the degree of the artifact varied significantly depending on the protective material. The dose reduction rates were 14.6%, 14.2%, and 26.0% when bismuth shield: normal (bismuth shield in the shape of an eye mask), bismuth shield: separate (two separate bismuth shields), and lead goggles were used, respectively. The "separate" bismuth shield was found to be effective in dose reduction without lowering the image quality. CONCLUSION We found that bismuth shields and lead goggles are suitable protective devices for the optimal reduction of lens doses.
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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: 9] [Impact Index Per Article: 3.0] [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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Haga Y, Chida K, Sota M, Kaga Y, Abe M, Inaba Y, Suzuki M, Meguro T, Zuguchi M. Hybrid Operating Room System for the Treatment of Thoracic and Abdominal Aortic Aneurysms: Evaluation of the Radiation Dose Received by Patients. Diagnostics (Basel) 2020; 10:diagnostics10100846. [PMID: 33086733 PMCID: PMC7589961 DOI: 10.3390/diagnostics10100846] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/09/2020] [Accepted: 10/10/2020] [Indexed: 11/16/2022] Open
Abstract
In recent years, endovascular treatment of aortic aneurysms has attracted considerable attention as a promising alternative to traditional surgery. Hybrid operating room systems (HORSs) are increasingly being used to perform endovascular procedures. The clinical benefits of endovascular treatments using HORSs are very clear, and these procedures are increasing in number. In procedures such as thoracic endovascular aortic repair (TEVAR) and endovascular aortic repair (EVAR), wires and catheters are used to deliver and deploy the stent graft in the thoracic/abdominal aorta under fluoroscopic control, including DSA. Thus, the radiation dose to the patient is an important issue. We determined radiation dose indicators (the dose–area product (DAP) and air karma (AK) parameters) associated with endovascular treatments (EVAR and TEVAR) using a HORS. As a result, the mean ± standard deviation (SD) DAPs of TEVAR and EVAR were 323.7 ± 161.0 and 371.3 ± 186.0 Gy × cm2, respectively. The mean ± SD AKs of TEVAR and EVAR were 0.92 ± 0.44 and 1.11 ± 0.54 Gy, respectively. The mean ± SD fluoroscopy times of TEVAR and EVAR were 13.4 ± 7.1 and 23.2 ± 11.7 min, respectively. Patient radiation dose results in this study of endovascular treatments using HORSs showed no deterministic radiation effects, such as skin injuries. However, radiation exposure during TEVAR and EVAR cannot be ignored. The radiation dose should be evaluated in HORSs during endovascular treatments. Reducing/optimizing the radiation dose to the patient in HORSs is important.
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Affiliation(s)
- Yoshihiro Haga
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiology, Sendai Kousei Hospital, 4-15 Hirosemachi, Aoba, Sendai 980-0873, Japan; (Y.K.); (M.A.)
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai, Miyagi 980-0845, Japan
- Correspondence: ; Tel.: +81-22-717-7943
| | - Masahiro Sota
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiology, Sendai Kousei Hospital, 4-15 Hirosemachi, Aoba, Sendai 980-0873, Japan; (Y.K.); (M.A.)
| | - Yuji Kaga
- Department of Radiology, Sendai Kousei Hospital, 4-15 Hirosemachi, Aoba, Sendai 980-0873, Japan; (Y.K.); (M.A.)
| | - Mitsuya Abe
- Department of Radiology, Sendai Kousei Hospital, 4-15 Hirosemachi, Aoba, Sendai 980-0873, Japan; (Y.K.); (M.A.)
| | - Yohei Inaba
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai, Miyagi 980-0845, Japan
| | - Masatoshi Suzuki
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai, Miyagi 980-0845, Japan
| | - Taiichiro Meguro
- Department of Cardiovascular Medicine, Sendai Kousei Hospital, 4-15 Hirose-machi, Aoba, Sendai 980-0873, Japan;
| | - Masayuki Zuguchi
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (Y.H.); (M.S.); (Y.I.); (M.S.); (M.Z.)
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Nemoto M, Chida K. Reducing the Breast Cancer Risk and Radiation Dose of Radiography for Scoliosis in Children: A Phantom Study. Diagnostics (Basel) 2020; 10:E753. [PMID: 32993028 PMCID: PMC7600947 DOI: 10.3390/diagnostics10100753] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 09/18/2020] [Accepted: 09/22/2020] [Indexed: 11/22/2022] Open
Abstract
Full-spinal radiographs (FRs) are often the first choice of imaging modality in the investigation of scoliosis. However, FRs are strongly related to breast cancer occurrence due to multiple large-field radiographic examinations taken during childhood and adolescence, which may increase the risk for breast cancer in adulthood among women with scoliosis. The purpose of this study was to consider various technical parameters to reduce the patient radiation dose of FRs for scoliosis. To evaluate breast surface doses (BSDs) in FRs, radio photoluminescence dosimeters were placed in contact with a child phantom. Using the PC-based Monte Carlo (PMC) program for calculating patient doses in medical X-ray examinations, the breast organ dose (BOD) and the effective dose were calculated by performing Monte Carlo simulations using mathematical phantom models. The BSDs in the posteroanterior (PA) view were 0.15-0.34-fold those in the anteroposterior (AP) view. The effective dose in the PA view was 0.4-0.61-fold that in the AP view. BSD measurements were almost equivalent to the BODs obtained using PMC at all exposure settings. During FRs, the PA view without an anti-scatter grid significantly reduced the breast dose compared to the AP view with an anti-scatter grid.
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Affiliation(s)
- Manami Nemoto
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Miyagi, Japan;
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Miyagi, Japan;
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai 980-0845, Miyagi, Japan
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25
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An initial investigation of a wireless patient radiation dosimeter for use in interventional radiology. Radiol Phys Technol 2020; 13:321-326. [PMID: 32715378 DOI: 10.1007/s12194-020-00575-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 07/09/2020] [Accepted: 07/10/2020] [Indexed: 10/23/2022]
Abstract
Radiation exposure during interventional radiology (IR) procedures is a critical issue. We have developed a wireless real-time dosimeter for IR patients that use nontoxic phosphor (four sensors). We evaluated the basic performance parameters (such as dose linearity, batch uniformity, reproducibility, and wireless-communication conditions) of the developed system using an IR X-ray system. Further, we investigated the influence of noise from other medical equipment on our wireless real-time dosimeter in the IR X-ray room. Overall, our wireless system exhibited excellent performance in terms of uniformity, reproducibility, and linearity; moreover, the wireless communication performance was better. The developed system enabled real-time visualization of patient radiation dose, without noise contamination from other medical equipment. In addition, the wireless system can be easily installed in a location where the PC screen (display) can be readily viewed by the IR physician. Hence, we developed a wireless system that can display the patient radiation dose data in real time; the system performed satisfactorily upon application in radiation dosimetry. Therefore, our wireless system will facilitate the real-time monitoring/management of patient radiation dose during IR.
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26
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Inaba Y, Nakamura M, Zuguchi M, Chida K. Development of Novel Real-Time Radiation Systems Using 4-Channel Sensors. SENSORS (BASEL, SWITZERLAND) 2020; 20:E2741. [PMID: 32403386 PMCID: PMC7248883 DOI: 10.3390/s20092741] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 05/05/2020] [Accepted: 05/09/2020] [Indexed: 11/17/2022]
Abstract
Radiation-related tissue injuries after medical radiation procedures, such as fluoroscopically guided intervention (FGI), have been reported in patients. Real-time monitoring of medical radiation exposure administered to patients during FGI is important to avoid such tissue injuries. In our previous study, we reported a novel (prototype) real-time radiation system for FGI. However, the prototype sensor indicated low sensitivity to radiation exposure from the side and back, although it had high-quality fundamental characteristics. Therefore, we developed a novel 4-channel sensor with modified shape and size than the previous sensor, and evaluated the basic performance (i.e., measured the energy, dose linearity, dose rate, and angular dependence) of the novel and previous sensors. Both sensors of our real-time dosimeter system demonstrated the low energy dependence, excellent dose linearity (R2 = 1.0000), and good dose rate dependence (i.e., within 5% statistical difference). Besides, the sensitivity of 0° ± 180° in the horizontal and vertical directions was almost 100% sensitivity for the new sensor, which significantly improved the angular dependence. Moreover, the novel dosimeter exerted less influence on X-ray images (fluoroscopy) than other sensors because of modifying a small shape and size. Therefore, the developed dosimeter system is expected to be useful for measuring the exposure of patients to radiation doses during FGI procedures.
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Affiliation(s)
- Yohei Inaba
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (M.N.); (M.Z.); (K.C.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai, Miyagi 980-0845, Japan
| | - Masaaki Nakamura
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (M.N.); (M.Z.); (K.C.)
| | - Masayuki Zuguchi
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (M.N.); (M.Z.); (K.C.)
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan; (M.N.); (M.Z.); (K.C.)
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 468-1 Aramaki Aza-Aoba, Aoba, Sendai, Miyagi 980-0845, Japan
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27
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Ishii H, Chida K, Satsurai K, Haga Y, Kaga Y, Abe M, Inaba Y, Zuguchi M. A PHANTOM STUDY TO DETERMINE THE OPTIMAL PLACEMENT OF EYE DOSEMETERS ON INTERVENTIONAL CARDIOLOGY STAFF. RADIATION PROTECTION DOSIMETRY 2019; 185:409-413. [PMID: 30864671 DOI: 10.1093/rpd/ncz027] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 02/07/2019] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
The International Commission on Radiological Protection has substantially reduced the recommended maximum annual eye lens dose for workers. Use of a dedicated eye dosemeter is one method for accurate dose monitoring. The main aim of this study was to yield recommendations for optimal placement of eye dosemeters to estimate the eye dose to interventional cardiology physicians and nurses. A phantom measurement was conducted to simulate typical interventional cardiology procedures. Considering eight X-ray tube angulations, the left side of the head position provide good estimates for physician, and the forehead position provide good estimates for nurse.
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Affiliation(s)
- H Ishii
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - K Chida
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University, Aramaki Aza-Aoba 468-1, Aoba-ku, Sendai 980-0845, Japan
| | - K Satsurai
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
| | - Y Haga
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirosemachi, Aoba-ku, Sendai 980-0873, Japan
| | - Y Kaga
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirosemachi, Aoba-ku, Sendai 980-0873, Japan
| | - M Abe
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirosemachi, Aoba-ku, Sendai 980-0873, Japan
| | - Y Inaba
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
- Disaster Medical Radiology, Division of Disaster Medical Science, International Research Institute of Disaster Science, Tohoku University, Aramaki Aza-Aoba 468-1, Aoba-ku, Sendai 980-0845, Japan
| | - M Zuguchi
- Department of Radiological Examination and Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba-ku, Sendai 980-8575, Japan
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28
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Ishii H, Haga Y, Sota M, Inaba Y, Chida K. Performance of the DOSIRIS™ eye lens dosimeter. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2019; 39:N19-N26. [PMID: 31167175 DOI: 10.1088/1361-6498/ab2729] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Monitoring and protecting of occupational eye doses in interventional radiology (IR) are very important matters. DOSIRIS™ is the useful solution to estimate the 3 mm dose-equivalent (Hp(3)), and it can be worn behind lead glasses. And DOSIRIS™, adjustable according to 3 axes, it is ideally placed as close to the eye and in contact with the skin. So, DOSIRIS™ will be suitable eye lens dosimeter. However, the fundamental characteristics of the DOSIRIS™ in the diagnostic x-ray energy domain (including that of IR x-ray systems) remain unclear. Here, we evaluated the performance of the dosimeter in that energy range. As a result, the DOSIRIS™ has good fundamental characteristics (batch uniformity, dose linearity, energy dependence, and angular dependence) in the diagnostic x-ray energy domain. We conclude that the DOSIRIS™ has satisfactory basic performance for occupational eye dosimetry in diagnostic x-ray energy settings (including IR x-ray systems).
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Affiliation(s)
- Hiroki Ishii
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
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Kawauchi S, Chida K, Moritake T, Matsumaru Y, Hamada Y, Sakuma H, Yoda S, Sun L, Sato M, Tsuruta W. ESTIMATION OF PATIENT LENS DOSE ASSOCIATED WITH C-ARM CONE-BEAM COMPUTED TOMOGRAPHY USAGE DURING INTERVENTIONAL NEURORADIOLOGY. RADIATION PROTECTION DOSIMETRY 2019; 184:138-147. [PMID: 30452704 DOI: 10.1093/rpd/ncy188] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 09/05/2018] [Accepted: 10/13/2018] [Indexed: 06/09/2023]
Abstract
The purpose of this study was to investigate the dose distribution and lens doses associated with C-arm cone-beam computed tomography (CBCT), using a head phantom, and to estimate the contribution ratio of C-arm CBCT to each patient's lens dose during interventional neuroradiology ('lens dose ratio') in 109 clinical cases. In the phantom study, the peak skin doses and respective right and left lens doses of C-arm CBCT were as follows: 63.0 ± 1.9 mGy, 19.7 ± 1.4 mGy and 21.9 ± 0.8 mGy in whole brain C-arm CBCT and 39.2 ± 1.4 mGy, 4.7 ± 0.9 mGy and 3.6 ± 0.3 mGy in high-resolution C-arm CBCT. In the clinical study, the lens dose ratios were 25.4 ± 8.7% in the right lens and 19.1 ± 9.8% in the left lens. This study shows that, on average, ~25% of patients' total lens dose was contributed by C-arm CBCT.
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Affiliation(s)
- Satoru Kawauchi
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato, Tokyo, Japan
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba, Sendai, Miyagi, Japan
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Graduate School of Medicine, Tohoku University, 2-1 Seiryo, Aoba, Sendai, Miyagi, Japan
| | - Takashi Moritake
- Department of Radiological Health Science, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, 1-1, Iseigaoka, Yahatanishi, Kitakyushu, Fukuoka, Japan
| | - Yuji Matsumaru
- Division for Stroke Prevention and Treatment, Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
| | - Yusuke Hamada
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato, Tokyo, Japan
| | - Hideyuki Sakuma
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato, Tokyo, Japan
| | - Shogo Yoda
- Department of Radiology, Toranomon Hospital, 2-2-2 Toranomon, Minato, Tokyo, Japan
| | - Lue Sun
- Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
| | - Masayuki Sato
- Division for Stroke Prevention and Treatment, Department of Neurosurgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, Japan
| | - Wataro Tsuruta
- Department of Endovascular Neurosurgery, Toranomon Hospital, 2-2-2 Toranomon, Minato, Tokyo, Japan
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Kato M, Chida K, Nakamura M, Toyoshima H, Terata K, Abe Y. New real-time patient radiation dosimeter for use in radiofrequency catheter ablation. JOURNAL OF RADIATION RESEARCH 2019; 60:215-220. [PMID: 30624747 PMCID: PMC6430253 DOI: 10.1093/jrr/rry110] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Indexed: 05/17/2023]
Abstract
In a previous study, we reported on a novel (prototype) real-time patient dosimeter with non-toxic phosphor sensors. In this study, we developed new types of sensors that were smaller than in the previous prototype, and clarified the clinical feasibility of our newly proposed dosimeter. Patient dose measurements obtained with the newly proposed real-time dosimeter were compared with measurements obtained using a calibrated radiophotoluminescence glass reference dosimeter (RPLD). The reference dosimeters were set at almost the same positions as the new real-time dosimeter sensors. We found excellent correlations between the reference RPLD measurements and those obtained using our new real-time dosimeter (r2 = 0.967). However, the new type of dosimeter was found to underestimate radiation skin dose measurements when compared with an RPLD. The most probable reason for this was the size reduction in the phosphor sensor of the new type of dosimeter. We believe that, as a result of reducing the phosphor sensor size, the backscattered X-ray irradiation was underestimated. However, the new dosimeter can accurately determine the absorbed dose by correcting the measured value with calibration factors. The calibration factor for the new type dosimeter was determined (by linear regression) to be ~1.15. New real-time patient dosimeter design would be an effective tool for the real-time measurement of patient skin doses during interventional radiology treatments.
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Affiliation(s)
- Mamoru Kato
- Department of Radiology and Nuclear Medicine, Research Institute for Brain and Blood Vessels – Akita, 6–10 Senshu-Kubota Machi, Akita, Akita, Japan
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-cho, Sendai, Miyagi, Japan
| | - Koichi Chida
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-cho, Sendai, Miyagi, Japan
| | - Masaaki Nakamura
- Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo-cho, Sendai, Miyagi, Japan
| | - Hideto Toyoshima
- Department of Radiology and Nuclear Medicine, Research Institute for Brain and Blood Vessels – Akita, 6–10 Senshu-Kubota Machi, Akita, Akita, Japan
| | - Ken Terata
- Department of Cardiology, Division of Internal Medicine, Research Institute for Brain and Blood Vessels – Akita, 6–10 Senshu-Kubota Machi, Akita, Akita, Japan
| | - Yoshihisa Abe
- Department of Cardiology, Division of Internal Medicine, Research Institute for Brain and Blood Vessels – Akita, 6–10 Senshu-Kubota Machi, Akita, Akita, Japan
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Iizuka T, Matsumoto K, Hagihara Y, Nasada T, Ikeuchi Y, Kikuchi K, Mitsuie C, Kotoura N, Yamakado K, Kobayashi K, Takaki H, Kako Y. [Measurement of Head and Neck Exposure in CT Guided IVR]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2019; 75:625-630. [PMID: 31327772 DOI: 10.6009/jjrt.2019_jsrt_75.7.625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In April 2011, the International Radiological Protection Committee recommended that "The equivalent dose of the crystalline lens should not exceed 20 mSv/year, averaged over defined periods of 5 years, with no single year exceeding 50 mSv". Based on this recommendation, it is predicted that the equivalent dose limit of our crystalline lens can be lowered in the near future. Therefore, it is important to grasp the current situation of radiation exposure. The purpose of this study is to measure the crystalline lens of surgeons by focusing on the CT-fluoroscopy guided interventional radiology's (IVRs). We also examined whether the exposure dose of the crystalline lens can be correctly evaluated by measuring the unequal exposure dose of the neck, which is usually used for the unequal exposure measurement. Results of the analysis of 200 CT-fluoroscopy guided IVR procedures showed that the unequal exposure dose of the neck was significantly correlated with the exposure dose of the crystalline lens which was measured near the left eye ball (R=0.83). However, the exposure dose of the crystalline was 33% lower than those of the neck. Therefore, although the individual dosimeter worn on the neck can be used as the useful index of the exposure dose of the crystalline lens, the results can be overestimated.
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Affiliation(s)
- Takafumi Iizuka
- Department of Radiological Technology, Hyogo College of Medicine
| | - Kazuma Matsumoto
- Department of Radiological Technology, Hyogo College of Medicine
| | | | - Toshiya Nasada
- Department of Radiological Technology, Hyogo College of Medicine
| | - Youko Ikeuchi
- Department of Radiological Technology, Hyogo College of Medicine
| | - Keisuke Kikuchi
- Department of Radiological Technology, Hyogo College of Medicine
| | - Chiemi Mitsuie
- Department of Radiological Technology, Hyogo College of Medicine
| | - Noriko Kotoura
- Department of Radiological Technology, Hyogo College of Medicine
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Inaba Y, Nakamura M, Chida K, Zuguchi M. Effectiveness of a novel real-time dosimeter in interventional radiology: a comparison of new and old radiation sensors. Radiol Phys Technol 2018; 11:445-450. [DOI: 10.1007/s12194-018-0484-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 10/03/2018] [Accepted: 10/04/2018] [Indexed: 11/24/2022]
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Nakamura M, Chida K, Inaba Y, Kobayashi R, Zuguchi M. Red-emission phosphor's brightness deterioration by x-ray and brightness recovery phenomenon by heating. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2017; 37:N19-N26. [PMID: 28488591 DOI: 10.1088/1361-6498/aa6272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
There are no feasible real-time and direct skin dosimeters for interventional radiology. One would be available if there were x-ray phosphors that had no brightness change caused by x-ray irradiation, but the emission of the Y2O3:Eu, (Y, Gd, Eu)BO3, and YVO4:Eu phosphors investigated in our previous study was reduced by x-ray irradiation. We found that the brightness of those phosphors recovered, and the purpose of this study is to investigate their recovery phenomena. It is expected that more kinds of phosphors could be used in x-ray dosimeters if the brightness changes caused by x-rays are elucidated and prevented. Three kinds of phosphors-Y2O3:Eu, (Y, Gd, Eu)BO3, and YVO4:Eu-were irradiated by x-rays (2 Gy) to reduce their brightness. After the irradiation, brightness changes occurring at room temperature and at 80 °C were investigated. The irradiation reduced the brightness of all the phosphors by 5%-10%, but the brightness of each recovered immediately both at room temperature and at 80 °C. The recovery at 80 °C was faster than that at room temperature, and at both temperatures the recovered brightness remained at 95%-98% of the brightness before the x-ray irradiation. The brightness recovery phenomena of Y2O3:Eu, (Y, Gd, Eu)BO3, and YVO4:Eu phosphors occurring after brightness deterioration due to x-ray irradiation were found to be more significant at 80 °C than at room temperature. More kinds of phosphors could be used in x-ray scintillation dosimeters if the reasons for the brightness changes caused by x-rays were elucidated.
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Affiliation(s)
- Masaaki Nakamura
- Department of Radiological Technology, Faculty of Medicine, School of Health Sciences, Tohoku University, 2-1 Seiryou-machi, Aoba-ku, Sendai 980-8575, Japan
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Haga Y, Chida K, Kaga Y, Sota M, Meguro T, Zuguchi M. Occupational eye dose in interventional cardiology procedures. Sci Rep 2017; 7:569. [PMID: 28373715 PMCID: PMC5428664 DOI: 10.1038/s41598-017-00556-3] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 03/03/2017] [Indexed: 01/19/2023] Open
Abstract
It is important to measure the radiation dose [3-mm dose equivalent, Hp(3)] in the eye. This study was to determine the current occupational radiation eye dose of staff conducting interventional cardiology procedures, using a novel direct eye dosimeter. We measured the occupational eye dose [Hp(3)] in physicians and nurses in a catheterization laboratory for 6-months. The eye doses [Hp(3)] of 12 physicians (9 with Pb glasses, 3 without), and 11 nurses were recorded using a novel direct eye dosimeter, the DOSIRISTM. We placed dosimeters above and under the glasses. We also estimated the eye dose [0.07-mm dose equivalent] using a neck personal dosimeter. The eye doses among interventional staff ranked in the following order: physicians without Pb glasses > physicians with Pb glasses > nurses. The shielding effect of the glasses (0.07-mm Pb) in a clinical setting was approximately 60%. In physicians who do not wear Pb glasses, the eye dose may exceed the new regulatory limit for IR staff. We found good correlations between the neck dosimeter dose and eye dosimeter dose (inside or outside glasses, R2 = 0.93 and R2 = 0.86, respectively) in physicians. We recommend that interventional physicians use an eye dosimeter for correct evaluation of the lens dose.
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Affiliation(s)
- Yoshihiro Haga
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, 980-8575, Japan
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai, 980-0873, Japan
| | - Koichi Chida
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, 980-8575, Japan.
- Department of Radiation Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, Aramaki Aza-Aoba 468-1, Aoba-ku, Sendai, 980-0845, Japan.
| | - Yuji Kaga
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai, 980-0873, Japan
| | - Masahiro Sota
- Department of Radiology, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai, 980-0873, Japan
| | - Taiichiro Meguro
- Department of Cardiovascular Medicine, Sendai Kousei Hospital, 4-5 Hirose-machi, Aoba-ku, Sendai, 980-0873, Japan
| | - Masayuki Zuguchi
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai, 980-8575, Japan
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