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Kakuta K, Chida K. Parameter optimisation for image acquisition and stacking in carbon dioxide digital subtraction angiography. Radiol Phys Technol 2024:10.1007/s12194-024-00841-7. [PMID: 39245734 DOI: 10.1007/s12194-024-00841-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 08/27/2024] [Accepted: 08/27/2024] [Indexed: 09/10/2024]
Abstract
The aim of this study was to optimise the vessel angle as well as the stack number from the profiles of carbon dioxide digital subtraction angiography (CO2-DSA) images of a water phantom containing an artificial vessel tilted at different angles which imitate arteries in the body. The artificial vessel was tilted at 0°, 15°, and 30° relative to the horizontal axis with its centre as the pivot point, and CO2-DSA images were acquired at each vessel tilt angle. The maximum opacity method was used to stack up to four images of the next frame one by one. The signal-to-noise ratio (SNR) was determined from the profile curves. The Wilcoxon rank sum test was used to evaluate whether the profile curve and SNR differed depending on the vessel tilt angle or stack number, and a p-value of less than 0.05 was considered statistically significant. Images acquired at 0° had a significantly lower SNR than images acquired at 15° (p = 0.10). When the vessel angle was 30°, the profile curves were significantly improved (p < 0.05) when two or more images were stacked over the original image. Images with a good SNR were acquired at the vessel tilt angle of 15°, and the shape of the profile curve was improved when two or more images were stacked on the original image. This study demonstrates that the quality of images acquired using CO2-DSA can be significantly improved through parameter optimisation for image acquisition and post-processing.
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Affiliation(s)
- Kazuya Kakuta
- Department of Disaster Medicine, Fukushima Medical University Hospital, Fukushima, Japan.
- Department of Radiology, Fukushima Medical University Hospital, Fukushima, Japan.
| | - Koichi Chida
- Department of Radiological Technology, Faculty of Health Sciences, Tohoku University Graduate School of Medicine, Sendai, Japan
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Ohno S, Konta S, Shindo R, Yamamoto K, Isobe R, Inaba Y, Suzuki M, Zuguchi M, Chida K. Effect of backscatter radiation on the occupational eye-lens dose. JOURNAL OF RADIATION RESEARCH 2024; 65:450-458. [PMID: 38818635 PMCID: PMC11262866 DOI: 10.1093/jrr/rrae034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/21/2024] [Indexed: 06/01/2024]
Abstract
We quantified the level of backscatter radiation generated from physicians' heads using a phantom. We also evaluated the shielding rate of the protective eyewear and optimal placement of the eye-dedicated dosimeter (skin surface or behind the Pb-eyewear). We performed diagnostic X-rays of two head phantoms: Styrofoam (negligible backscatter radiation) and anthropomorphic (included backscatter radiation). Radiophotoluminescence glass dosimeters were used to measure the eye-lens dose, with or without 0.07-mm Pb-equivalent protective eyewear. We used tube voltages of 50, 65 and 80 kV because the scattered radiation has a lower mean energy than the primary X-ray beam. The backscatter radiation accounted for 17.3-22.3% of the eye-lens dose, with the percentage increasing with increasing tube voltage. Furthermore, the shielding rate of the protective eyewear was overestimated, and the eye-lens dose was underestimated when the eye-dedicated dosimeter was placed behind the protective eyewear. We quantified the backscatter radiation generated from physicians' heads. To account for the effect of backscatter radiation, an anthropomorphic, rather than Styrofoam, phantom should be used. Close contact of the dosimeter with the skin surface is essential for accurate evaluation of backscatter radiation from physician's own heads. To assess the eye-lens dose accurately, the dosimeter should be placed near the eye. If the dosimeter is placed behind the lens of the protective eyewear, we recommend using a backscatter radiation calibration factor of 1.2-1.3.
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Affiliation(s)
- Saya Ohno
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Satoe Konta
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Ryota Shindo
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Keisuke Yamamoto
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Rio Isobe
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Yohei Inaba
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Radiological Disasters and Medical Science, Department of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 6-6-4, Aoba, Sendai 980-8579, Japan
| | - Masatoshi Suzuki
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Radiological Disasters and Medical Science, Department of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 6-6-4, Aoba, Sendai 980-8579, Japan
| | - Masayuki Zuguchi
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Radiological Disasters and Medical Science, Department of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 6-6-4, Aoba, Sendai 980-8579, Japan
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Shindo R, Ohno S, Yamamoto K, Konta S, Inaba Y, Suzuki M, Zuguchi M, Chida K. Comparison of shielding effects of over-glasses-type and regular eyewear in terms of occupational eye dose reduction. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2024; 44:023501. [PMID: 38701771 DOI: 10.1088/1361-6498/ad4714] [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: 01/17/2024] [Accepted: 05/03/2024] [Indexed: 05/05/2024]
Abstract
Given the new recommendations for occupational eye lens doses, various lead glasses have been used to reduce irradiation of interventional radiologists. However, the protection afforded by lead glasses over prescription glasses (thus over-glasses-type eyewear) has not been considered in detail. We used a phantom to compare the protective effects of such eyewear and regular eyewear of 0.07 mm lead-equivalent thickness. The shielding rates behind the eyewear and on the surface of the left eye of an anthropomorphic phantom were calculated. The left eye of the phantom was irradiated at various angles and the shielding effects were evaluated. We measured the radiation dose to the left side of the phantom using RPLDs attached to the left eye and to the surface/back of the left eyewear. Over-glasses-type eyewear afforded good protection against x-rays from the left and below; the average shielding rates on the surface of the left eye ranged from 0.70-0.72. In clinical settings, scattered radiation is incident on physicians' eyes from the left and below, and through any gap in lead glasses. Over-glasses-type eyewear afforded better protection than regular eyewear of the same lead-equivalent thickness at the irradiation angles of concern in clinical settings. Although clinical evaluation is needed, we suggest over-glasses-type Pb eyewear even for physicians who do not wear prescription glasses.
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Affiliation(s)
- Ryota Shindo
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Saya Ohno
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Keisuke Yamamoto
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Satoe Konta
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Yohei Inaba
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Radiological Disasters and Medical Science, Department of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 6-6-4 Aoba, Sendai 980-8579, Japan
| | - Masatoshi Suzuki
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Radiological Disasters and Medical Science, Department of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 6-6-4 Aoba, Sendai 980-8579, Japan
| | - Masayuki Zuguchi
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
| | - Koichi Chida
- Department of Radiological Technology, Tohoku University Graduate School of Medicine, 2-1 Seiryo, Aoba, Sendai 980-8575, Japan
- Division of Radiological Disasters and Medical Science, Department of Disaster Medicine, International Research Institute of Disaster Science, Tohoku University, 6-6-4 Aoba, Sendai 980-8579, Japan
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Imai S, Yamahata A, Kakimoto A, Kawaji Y, Gotanda T, Akagawa T, Yatake H. Evaluation of factors associated with the effectiveness of radiation protection glasses. RADIATION PROTECTION DOSIMETRY 2023; 199:1002-1006. [PMID: 37225197 DOI: 10.1093/rpd/ncad103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The effects of lead equivalent and lens area of radiation-protective eyewear on lens exposure control were examined. The simulated patient underwent 10-min X-ray fluoroscopy, and the lens dose of the simulated surgeon wearing radiation protection glasses was measured using lens dosemeters attached to the corner of the eye and eyeball. In total, 10 types of radiation protection glasses were selected for measurement. Correlation analysis of the equivalent dose in the lens of the eye with lead equivalence and lens area was performed. The equivalent dose in the lens of the eye of the corner of the eye was negatively correlated with the area of the lens. The equivalent dose in the lens of the eye and the eyeball showed a strong negative correlation with lead equivalence. Lens dosemeters worn at the corner of the eye may overestimate the equivalent dose in the lens of the eye. Moreover, the reduction in exposure of the lens was significantly influenced by the lead equivalent.
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Affiliation(s)
- Shinya Imai
- Faculty of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | - Asuka Yamahata
- Faculty of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | - Akihiro Kakimoto
- Faculty of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | - Yasuyuki Kawaji
- Faculty of Health Sciences, Junshin Gakuen University, Fukuoka, Japan
| | - Tatsuhiro Gotanda
- Faculty of Health Sciences and Technology, Kawasaki University of Medical Welfare, Okayama, Japan
| | - Takuya Akagawa
- Department of Radiological Technology, Tokushima Red Cross Hospital, Tokushima, Japan
| | - Hidetoshi Yatake
- Department of Breast Cancer Center, Kaizuka City Hospital, Osaka, Japan
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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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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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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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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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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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Lin PJP, Goode AR, Corwin FD, Fisher RF, Balter S, Wunderle KA, Schueler BA, Kim DS, Zhang J, Zhou YJ, Jenkins PA, Mahmood U, Lin T, Zhao H, Park MA, Trianni A, Lendle M, Kuhls-Gilcrist A, Jans JC, Desponds L, Banasiak G, Backes S, Snyder C, Snyder A, Lu M, Gonzalez S. Report of AAPM Task Group 272: Comprehensive acceptance testing and evaluation of fluoroscopy imaging systems. Med Phys 2022; 49:e1-e49. [PMID: 35032394 DOI: 10.1002/mp.15429] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 11/06/2022] Open
Abstract
Modern fluoroscopes used for image guidance have become quite complex. Adding to this complexity are the many regulatory and accreditation requirements that must be fulfilled during acceptance testing of a new unit. Further, some of these acceptance tests have pass/fail criteria, while others do not, making acceptance testing a subjective and time consuming task. The AAPM Task Group 272 Report spells out the details of tests that are required and gives visibility to some of the tests that while not yet required, are recommended as good practice. The organization of the report begins with the most complicated fluoroscopes used in interventional radiology or cardiology, continues with general fluoroscopy and mobile C-arms. Finally, the Appendices of the report provide useful information, an example report form and topics that needed their own section due to the level of detail. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Pei-Jan Paul Lin
- Department of Radiology, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Allen R Goode
- Department of Radiology, University of Virginia, Charlottesville, VA, 22908, USA
| | - Frank D Corwin
- Department of Radiology, Virginia Commonwealth University, Richmond, VA, 23298, USA
| | - Ryan F Fisher
- Department of Radiology, The MetroHealth System, Cleveland, OH, 44109, USA
| | - Stephen Balter
- Departments of Medicine and Radiology, Columbia University Medical Center, New York, NY, 10021, USA
| | - Kevin A Wunderle
- Department of Radiology, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Beth A Schueler
- Radiology Department, Mayo Clinic, Rochester, MN, 55905, USA
| | - Don-Soo Kim
- Department of Radiology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Jie Zhang
- Department of Radiology, University of Kentucky, Lexington, KY, 40536, USA
| | - Yifang Jimmy Zhou
- Department of Imaging, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA
| | - Peter A Jenkins
- Department of Radiology, University of Utah Health, Salt Lake City, UT, 84132, USA
| | - Usman Mahmood
- Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA
| | - Teh Lin
- Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Hui Zhao
- Department of Radiation Oncology, University of Utah, Salt Lake City, UT, 84112, USA
| | - Mi-Ae Park
- Department of Radiology, University of Texas Southwestern, Dallas, TX, 75390, USA
| | - Annalisa Trianni
- Medical Physics Department, Udine University Hospital, Udine, 33100, Italy
| | | | | | - Jan C Jans
- Philips Healthcare, Best, 5680 DA, The Netherlands
| | | | | | - Steve Backes
- Atirix Medical Systems, Inc., Minneapolis, MN, 55305, USA
| | - Carl Snyder
- Atirix Medical Systems, Inc., Minneapolis, MN, 55305, USA
| | - Angela Snyder
- Atirix Medical Systems, Inc., Minneapolis, MN, 55305, USA
| | - Minghui Lu
- Varex Imaging Corporation, San Jose, CA, 95134, USA
| | - Scott Gonzalez
- Food and Drug Administration, Health and Human Services, Silver Spring, MD, 20993, USA
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11
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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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12
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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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13
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Imai S, Akahane M, Ogata Y, Tanki N, Sato H, Tameike K. Occupational eye lens dose in endoscopic retrograde cholangiopancreatography using a dedicated eye lens dosimeter. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2021; 41:579-589. [PMID: 34102616 DOI: 10.1088/1361-6498/ac091f] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 06/08/2021] [Indexed: 05/28/2023]
Abstract
Increased x-ray exposure to physicians' eye lenses during radiology procedures is a significant concern. In this study, x-ray exposure to the eye was measured using an anthropomorphic head phantom, with and without radiation-protective devices, to examine the dose of x-ray radiation that physicians are exposed to during endoscopic retrograde cholangiopancreatography (ERCP). X-ray exposure of the eye was measured using novel dedicated direct eye lens dosimeters that could specifically measureHp(3) during the ERCP procedure. The spatial dose in the height direction of the physician was measured using an ionization chamber dosimeter. Eye dosimeters were attached inside and outside the lead (Pb) glasses attached to the head of the human phantom to demonstrate its protective effect. Irradiation from the system lasted for 30 min. When the overcouch x-ray tube system is used, the cumulative radiation dose over the 30 min x-ray fluoroscopy time, without the use of radiation-protective devices, to the left and right eyes was 3.7 and 1.5 mSv, respectively. This dose was estimated to be the dose to the lens per therapeutic ERCP examination. With radiation-protective glasses, the dose reduced to 1.8 and 1.0 mSv for the left and right eye, respectively. The results of our study indicated that radiation exposure to the eye was reduced by up to 80.0% using Pb glasses and by 96.8% using radiation-protective curtains. Our study indicates that a physician's maximum radiation exposure to the eyes during an ERCP procedure may be above the level recommended by the International Commission on Radiological Protection when the physician does not use radiation-protective devices. The eyewear, which is larger and fitted more closely to the face, provided a better protection effect even with a low lead equivalence, demonstrating that the shape of eyewear is important for protective function.
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Affiliation(s)
- Shinya Imai
- Faculty of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | | | - Yuji Ogata
- Faculty of Health Sciences, Morinomiya University of Medical Sciences, Osaka, Japan
| | - Nobuyoshi Tanki
- Brain Activity Imaging Center, ATR-Promotions Inc., Kyoto, Japan
| | - Hitoshi Sato
- Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan
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14
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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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15
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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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16
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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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17
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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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18
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Järvinen J, Sierpowska J, Siiskonen T, Järvinen H, Kiviniemi T, Rissanen TT, Matikka H, Niskanen E, Hurme S, Larjava HRS, Mäkelä TJ, Strengell S, Eskola M, Parviainen T, Hallinen E, Pirinen M, Kivelä A, Teräs M. CONTEMPORARY RADIATION DOSES IN INTERVENTIONAL CARDIOLOGY: A NATIONWIDE STUDY OF PATIENT DOSES IN FINLAND. RADIATION PROTECTION DOSIMETRY 2019; 185:483-493. [PMID: 30989216 DOI: 10.1093/rpd/ncz041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/01/2019] [Accepted: 03/26/2019] [Indexed: 06/09/2023]
Abstract
The amount of interventional procedures such as percutaneous coronary intervention (PCI), transcatheter aortic valve implantation (TAVI), pacemaker implantation (PI) and ablations has increased within the previous decade. Simultaneously, novel fluoroscopy mainframes enable lower radiation doses for patients and operators. Therefore, there is a need to update the existing diagnostic reference levels (DRLs) and propose new ones for common or recently introduced procedures. We sought to assess patient radiation doses in interventional cardiology in a large sample from seven hospitals across Finland between 2014 and 2016. Data were used to set updated national DRLs for coronary angiographies (kerma-air product (KAP) 30 Gycm2) and PCIs (KAP 75 cm2), and novel levels for PIs (KAP 3.5 Gycm2), atrial fibrillation ablation procedures (KAP 25 Gycm2) and TAVI (KAP 90 Gycm2). Tentative KAP values were set for implantations of cardiac resynchronization therapy devices (CRT, KAP 22 Gycm2), electrophysiological treatment of atrioventricular nodal re-entry tachycardia (6 Gycm2) and atrial flutter procedures (KAP 16 Gycm2). The values for TAVI and CRT device implantation are published for the first time on national level. Dose from image acquisition (cine) constitutes the major part of the total dose in coronary and atrial fibrillation ablation procedures. For TAVI, patient weight is a good predictor of patient dose.
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Affiliation(s)
- Jukka Järvinen
- Department of Cardiology, Turku Heart Centre, Turku University Hospital and University of Turku, Turku, Finland
- Department of Radiology, The Medical Imaging Centre of Southwest Finland, Turku University Hospital, Turku, Finland
- Department of Medical Physics, Turku University Hospital, Turku, Finland
| | - Joanna Sierpowska
- Department of Radiology, Central Hospital of Northern Karelia, Joensuu, Finland
| | | | - Hannu Järvinen
- Radiation and Nuclear Safety Authority, Helsinki, Finland
| | - Tuomas Kiviniemi
- Department of Cardiology, Turku Heart Centre, Turku University Hospital and University of Turku, Turku, Finland
| | - Tuomas T Rissanen
- Department of Radiology, Central Hospital of Northern Karelia, Joensuu, Finland
| | - Hanna Matikka
- Department of Radiology, Imaging Centre, Kuopio University Hospital, Kuopio, Finland
| | - Eini Niskanen
- Department of Radiology, Vaasa Central Hospital, Vaasa, Finland
| | - Saija Hurme
- Department of Biostatistics, University of Turku
| | - Heli R S Larjava
- Department of Medical Imaging, Central Finland Health Care District, Jyväskylä, Finland
| | - Timo J Mäkelä
- Department of Internal Medicine, Division of Cardiology, Oulu University Hospital, Oulu, Finland
| | - Satu Strengell
- Department of Cardiology, Cardiology Division, Heart and Lung Center, Helsinki University Hospital, Helsinki, Finland
| | - Markku Eskola
- Department of Cardiology, Heart Hospital, Tampere University Hospital, Tampere, Finland and Faculty of Medicine and Life Sciences, University of Tampere, Finland
| | | | - Elina Hallinen
- Radiation and Nuclear Safety Authority, Helsinki, Finland
| | - Markku Pirinen
- Radiation and Nuclear Safety Authority, Helsinki, Finland
| | - Antti Kivelä
- Department of Radiology, Imaging Centre, Kuopio University Hospital, Kuopio, Finland
| | - Mika Teräs
- Department of Medical Physics, Turku University Hospital, Turku, Finland
- Department of Biomedicine, Institute of Biomedicine, University of Turku, Turku, Finland
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19
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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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Achekzai T, Hamedani H, Kadlecek SJ, Ruppert K, Xin Y, Baron RJ, Duncan IF, Sertic F, Siddiqui S, Amzajerdian F, Pourfathi M, Loza LA, Cereda M, Rizi RR. Multibreath Hyperpolarized 3He Imaging Scheme to Measure Alveolar Oxygen Tension and Apparent Diffusion Coefficient. Acad Radiol 2019; 26:367-382. [PMID: 30630659 PMCID: PMC6540759 DOI: 10.1016/j.acra.2018.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 09/20/2018] [Accepted: 10/01/2018] [Indexed: 12/15/2022]
Abstract
RATIONALE AND OBJECTIVES In this study, we compared a newly developed multibreath simultaneous alveolar oxygen tension and apparent diffusion coefficient (PAO2-ADC) imaging sequence to a single-breath acquisition, with the aim of mitigating the compromising effects of intervoxel flow and slow-filling regions on single-breath measurements, especially in chronic obstructive pulmonary disease (COPD) subjects. MATERIALS AND METHODS Both single-breath and multibreath simultaneous PAO2-ADC imaging schemes were performed on a total of 10 human subjects (five asymptomatic smokers and five COPD subjects). Estimated PAO2 and ADC values derived from the different sequences were compared both globally and regionally. The distribution of voxels with nonphysiological values was also compared between the two schemes. RESULTS The multibreath protocol decreased the ventilation defect volumes by an average of 12.9 ± 6.6%. The multibreath sequence generated nonphysiological PAO2 values in 11.0 ± 8.5% fewer voxels than the single-breath sequence. Single-breath PAO2 maps also showed more regions with gas-flow artifacts and general signal heterogeneity. On average, the standard deviation of the PAO2 distribution was 16.5 ± 7.0% lower using multibreath PAO2-ADC imaging, suggesting a more homogeneous gas distribution. Both mean and standard deviation of the ADC increased significantly from single- to multibreath imaging (p = 0.048 and p = 0.070, respectively), suggesting more emphysematous regions in the slow-filling lung. CONCLUSION Multibreath PAO2-ADC imaging provides superior accuracy and efficiency compared to previous imaging protocols. PAO2 and ADC maps generated by multibreath imaging allowed for the qualification of various regions as emphysematous or obstructed, which single-breath PAO2 maps can only identify as defects. The simultaneous PAO2 and ADC measurements generated by the presented multibreath method were also more physiologically realistic, and allowed for more detailed analysis of the slow-filling regions characteristic of COPD subjects.
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Affiliation(s)
- Tahmina Achekzai
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Hooman Hamedani
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Stephen J Kadlecek
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Kai Ruppert
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Yi Xin
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ryan J Baron
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ian F Duncan
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Federico Sertic
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Sarmad Siddiqui
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Faraz Amzajerdian
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Mehrdad Pourfathi
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Luis A Loza
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Maurizio Cereda
- Department of Anesthesiology and Critical Care, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Rahim R Rizi
- Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania.
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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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Application of newly developed Fluoro-QC software for image quality evaluation in cardiac X-ray systems. Radiography (Lond) 2018; 24:e44-e47. [PMID: 29605124 DOI: 10.1016/j.radi.2017.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 12/09/2017] [Accepted: 12/13/2017] [Indexed: 11/24/2022]
Abstract
INTRODUCTION A quality assurance (QA) program is a valuable tool for the continuous production of optimal quality images. The aim of this paper is to assess a newly developed automatic computer software for image quality (IR) evaluation in fluoroscopy X-ray systems. METHODS Test object images were acquired using one fluoroscopy system, Siemens Axiom Artis model (Siemens AG, Medical Solutions Erlangen, Germany). The software was developed as an ImageJ plugin. Two image quality parameters were assessed: high-contrast spatial resolution (HCSR) and signal-to-noise ratio (SNR). The time between manual and automatic image quality assessment procedures were compared. The paired t-test was used to assess the data. p Values of less than 0.05 were considered significant. RESULTS The Fluoro-QC software generated faster IQ evaluation results (mean = 0.31 ± 0.08 min) than manual procedure (mean = 4.68 ± 0.09 min). The mean difference between techniques was 4.36 min. Discrepancies were identified in the region of interest (ROI) areas drawn manually with evidence of user dependence. The new software presented the results of two tests (HCSR = 3.06, SNR = 5.17) and also collected information from the DICOM header. Significant differences were not identified between manual and automatic measures of SNR (p value = 0.22) and HCRS (p value = 0.46). CONCLUSION The Fluoro-QC software is a feasible, fast and free to use method for evaluating imaging quality parameters on fluoroscopy systems.
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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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Chida K, Kato M, Inaba Y, Kobayashi R, Nakamura M, Abe Y, Zuguchi M. Real-time patient radiation dosimeter for use in interventional radiology. Phys Med 2016; 32:1475-1478. [DOI: 10.1016/j.ejmp.2016.10.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/09/2016] [Accepted: 10/18/2016] [Indexed: 10/20/2022] Open
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