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105. Multicenter Study on Evaluation of the Entrance Skin Dose by a Direct Measurement Method in Cardiac Interventional Procedures

Author

Kato, Mamoru, primary, Chida, Koichi, additional, Moritake, Takashi, additional, Koguchi, Yasuhiro, additional, Kaga, Yuji, additional, Sakamoto, Hajime, additional, Tsukamoto, Atsuko, additional, Kawauchi, Satoru, additional, Matsumoto, Kazuma, additional, Matsumura, Mitsuaki, additional, Oosaka, Hajime, additional, and Toyoshima, Hideto, additional

Published
2016
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108. The Tohoku Medical Megabank Project: Design and Mission

Author

Kuriyama, Shinichi, primary, Yaegashi, Nobuo, additional, Nagami, Fuji, additional, Arai, Tomohiko, additional, Kawaguchi, Yoshio, additional, Osumi, Noriko, additional, Sakaida, Masaki, additional, Suzuki, Yoichi, additional, Nakayama, Keiko, additional, Hashizume, Hiroaki, additional, Tamiya, Gen, additional, Kawame, Hiroshi, additional, Suzuki, Kichiya, additional, Hozawa, Atsushi, additional, Nakaya, Naoki, additional, Kikuya, Masahiro, additional, Metoki, Hirohito, additional, Tsuji, Ichiro, additional, Fuse, Nobuo, additional, Kiyomoto, Hideyasu, additional, Sugawara, Junichi, additional, Tsuboi, Akito, additional, Egawa, Shinichi, additional, Ito, Kiyoshi, additional, Chida, Koichi, additional, Ishii, Tadashi, additional, Tomita, Hiroaki, additional, Taki, Yasuyuki, additional, Minegishi, Naoko, additional, Ishii, Naoto, additional, Yasuda, Jun, additional, Igarashi, Kazuhiko, additional, Shimizu, Ritsuko, additional, Nagasaki, Masao, additional, Koshiba, Seizo, additional, Kinoshita, Kengo, additional, Ogishima, Soichi, additional, Takai-Igarashi, Takako, additional, Tominaga, Teiji, additional, Tanabe, Osamu, additional, Ohuchi, Noriaki, additional, Shimosegawa, Toru, additional, Kure, Shigeo, additional, Tanaka, Hiroshi, additional, Ito, Sadayoshi, additional, Hitomi, Jiro, additional, Tanno, Kozo, additional, Nakamura, Motoyuki, additional, Ogasawara, Kuniaki, additional, Kobayashi, Seiichiro, additional, Sakata, Kiyomi, additional, Satoh, Mamoru, additional, Shimizu, Atsushi, additional, Sasaki, Makoto, additional, Endo, Ryujin, additional, Sobue, Kenji, additional, Tohoku Medical Megabank Project Study Group, the, additional, and Yamamoto, Masayuki, additional

Published
2016
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110. Radiation dose to the interventional radiology staff, especially nurses

Author

Chida, Koichi

Subjects
Radiation safety, Catheters, Physics, Fluoroscopy, Interventional vascular, Dosimetric comparison, Radioprotection / Radiation dose, Catheter arteriography, Radiation physics
Abstract

Learning objectives Background Imaging findings OR Procedure details Conclusion References Personal Information, Learning objectives: To show the current occupational radiation dose to interventional radiology (IR) staff (physicians, nurses, and technologists). To understand the importance of radiation protection for IR staff. To demonstrate the need for using two badges to...

Published
2013
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111. Effectiveness of a New Lead-Shielding Device and Additional Filter for Reducing Staff and Patient Radiation Exposure During Videofluoroscopic Swallowing Study Using a Human Phantom.

Author

Morishima, Yoshiaki, Chida, Koichi, Muroya, Yoshikazu, and Utsumi, Yoshiya

Abstract

Interventional radiology procedures often involve lengthy exposure to fluoroscopy-derived radiation. We therefore devised a videofluoroscopic swallowing study (VFSS) procedure using a human phantom that proved to protect the patient and physician by reducing the radiation dose. We evaluated a new lead-shielding device and separately attached additional filters (1.0-, 2.0-, and 3.0-mm Al filters and a 0.5-mm Cu filter) during VFSS to reduce the patient's entrance skin dose (ESD). A monitor attached to the human phantom's neck measured the ESD. We also developed another lead shield (VFSS Shielding Box, 1.0-mm Pb equivalent) and tested its efficacy using the human phantom and an ionization chamber radiation survey meter with and without protection from scattered radiation at the physician's position on the phantom. We then measured the scattered radiation (at 90 and 150 cm above the floor) after combining the filters with the VFSS Shielding Box. With the additional filters, the ESD was reduced by 15.4-55.1%. With the VFSS Shielding Box alone, the scattered radiation was reduced by about 10% compared with the dose without additional shielding. With the VFSS Shielding Box and filters combined, the scattered radiation dose was reduced by a maximum of about 44% at the physician's position. Thus, the additional lead-shielding device effectively provided protection from scattered radiation during fluoroscopy. These results indicate that the combined VFSS Shielding Box and filters can effectively reduce the physician's and patient's radiation doses. [ABSTRACT FROM AUTHOR]

Published
2018
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112. Dose at an interventional reference point: Comparison between displayed values of X-ray units and actual measured values

Author

Chida, Koichi

Subjects
Radiation safety, Occupational / Environmental hazards, Physics, Dosimetry, Fluoroscopy, Digital radiography, Interventional vascular, Radioprotection / Radiation dose, Catheter arteriography, Radiation physics
Abstract

Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References, Learning objectives: To understand the importance of dose at the interventional reference point (reference dose) in interventional radiology (IR). To discuss the accuracy of displayed reference doses in IR X-ray equipment. To show the importance of evaluating the...

Published
2012
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113. Visualization of sources of scattered radiation from x-ray equipment used for interventional radiology

Author

Chida, Koichi

Subjects
Radiation safety, Occupational / Environmental hazards, Dosimetry, Fluoroscopy, Angioplasty, Digital radiography, Interventional vascular, Radioprotection / Radiation dose, Catheter arteriography
Abstract

Purpose Methods and Materials Results Conclusion References Personal Information, Purpose: To clarify and visualize the sources of physician-received scattered radiation in interventional radiology (IR). To present the amount of sphysician-received cattered radiation from IR X-ray equipment. To presentthe importance of radiation...

Published
2011
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118. Estimation of Maximum Entrance Skin Dose during Cerebral Angiography

Author

Kawauchi, Satoru, primary, Moritake, Takashi, additional, Hayakawa, Mikito, additional, Hamada, Yusuke, additional, Sakuma, Hideyuki, additional, Yoda, Shogo, additional, Satoh, Masayuki, additional, Sun, Lue, additional, Koguchi, Yasuhiro, additional, Akahane, Keiichi, additional, Chida, Koichi, additional, and Matsumaru, Yuji, additional

Published
2015
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119. Development of a simple QC phantom for evaluating FPD images

Author

Chida, Koichi

Subjects
Radiation safety, Radiographers - Technical Aspects, Technical aspects
Abstract

Purpose Methods and Materials Results Conclusion References Personal Information, Purpose: The use of diagnostic X-ray equipment with flat-panel detectors (FPDs) has increased because FPDs exhibitfine fundamental performance, such as good detective quantum efficiency (DQE). There are many types of FPD, but their performance differs, e.g....

Published
2010
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121. Does a flat-panel detector reduce the skin radiation dose in interventional procedures?

Author

Chida, Koichi

Abstract

Learning objectives Background Imaging findings OR Procedure details Conclusion Personal Information References, Learning objectives: To clarify whether the radiation dose during interventional radiology(IVR) is lower or higher in flat-panel detector (FPD) systems compared to image intensifier (II.) systems. To explain the methods that can be used to reduce the radiation dose in...

Published
2009
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123. What is the most effective indicator for estimating the maximum radiation dose to the patient during percutaneous coronary intervention procedures?

Author

Chida, Koichi

Abstract

Learning objectives Background Imaging findings OR Procedure details Conclusions Personal Information References, Learning objectives: 1. To discuss the indicators (i.e. dose-area product , fluoroscopic time, and patient’s total entrance skin dose) for estimating the maximum radiation dose to the patient’s skin (MSD) in percutaneous coronary intervention (PCI) and understand...

Published
2008
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132. Corrigendum to “Precise mapping system of entrance skin dose during endovascular embolization for cerebral aneurysm” [Radiat. Meas. 46 (2011), 2103–2106.]

Author

Moritake, Takashi, primary, Hayakawa, Mikito, additional, Matsumaru, Yuji, additional, Takigawa, Tomoji, additional, Koguchi, Yasuhiro, additional, Miyamoto, Yuka, additional, Mizuno, Yusuke, additional, Chida, Koichi, additional, Akahane, Keiichi, additional, Tsuboi, Koji, additional, Sakae, Takeji, additional, and Sakurai, Hidehiko, additional

Published
2012
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143. Reduced compression mammography to reduce breast pain

Author

Chida, Koichi, primary, Komatsu, Yuka, additional, Sai, Masahiro, additional, Nakagami, Asuka, additional, Yamada, Takayuki, additional, Yamashita, Takuya, additional, Mori, Issei, additional, Ishibashi, Tadashi, additional, Maruoka, Shin, additional, and Zuguchi, Masayuki, additional

Published
2009
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146. Fundamental study on the characteristics of a radiophotoluminescence glass dosemeter with no energy compensation filter for measuring patient entrance doses in cardiac interventional procedures.

Author

Kato, Mamoru, Chida, Koichi, Moritake, Takashi, Koguchi, Yasuhiro, Sato, Tadaya, Oosaka, Hajime, Tosa, Tetsuo, and Kadowaki, Ken

Subjects
CARDIAC arrest, HEART diseases, PHOTOLUMINESCENCE, FLUORESCENCE, X-rays
Abstract

Cardiac interventional procedures have been increasing year by year. However, radiation skin injuries have been still reported. There is a necessity to measure the patient entrance skin dose (ESD), but an accurate dose measurement method has not been established. To measure the ESD, a lot of radiophotoluminescence dosemeters (RPLDs) provide an accurate measurement of the direct actual ESD at the points they are arrayed. The purpose of this study was to examine the characteristics of RPLD to measure the ESD. As a result, X-ray permeable RPLD (with no tin filter) did not interfere with the percutaneous coronary intervention procedure. The RPLD also had good fundamental performance characteristics. Although the RPLD had a little energy dependence, it showed excellent dose and dose-rate linearity, and good angular dependence. In conclusion, by calibrating the energy dependence, RPLDs are useful dosemeter to measure the ESD in cardiac intervention. [ABSTRACT FROM AUTHOR]

Published
2014
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