Background: Cardiac interventional radiology procedures such as percutaneous coronary intervention (PCI) have been increasing year by year because of their low invasiveness compared to surgical operations such as coronary artery bypass grafts. Although numerous case reports of patient radiation injury resulting from PCI are increasingly being published, these reports likely represent a small fraction of the actual cases. Once, we had examined the prospective study to identify radiation injuries after PCI. Although mild erythema occurred (Fig.1), we observed six cases (1.5%) of radiation skin injury...

Direct measurement system: There is a necessity to measure the ESD and its mapping, but accurate dose measurement method has not been established. We devised a accurate measurement system for ESD and maximum patient skin dose (MSD), using many RPLDs in an array. In this study, we examined the fundamental characteristics of an RPLD. Materials: The x-ray device used in this study was a digital cine single-plane x-ray system (Infinix Celeve-i, Toshiba, Japan) with a flat-panel detector (FPD). This equipment includes a fixed additional filter...

effective energy (keV) The relationship between effective energy (keV) obtained HVL and tube voltage of 70 to 120kVp is shown in Figure4. The effective energies at 70, 80, 90, 100, 110, and 120kVp were 40.8, 42.2, 44.7, 46.9, 48.1, and 50.5keV, respectively. energy dependence (keV) The energy dependence (keV) is shown in Figure 5. The GD-302M showed high sensitivity, and the sensitivity tended to decrease a little as effective energy increased. The calibration factor of the GD-302M is shown in Figure6. dose dependence The dose...

　　　X-ray permeable RPLD (with no thin filter) did not interfere with PCI procedure. The RPLD also had good fundamental performance characteristics. Although the RPLD had little energy dependence, it showed excellent dose and dose-rate linearity, and good angular dependence. Furthermore, the energy dependence can be corrected using calibration factors. 　　　We expect that this direct measurement method using RPLDs dosimetry gowncan provide accurate ESD and MSD measurements in cardiac IRs.

International Commission on Radiological Protection. Avoidance of radiation injuries from medical interventional procedures. ICRP Publication 85. (Ann. ICRP 30)(2000). Tsapaki V, Kottou S, Vano E, Parviainen T, Padovani R, Dowling A, Molfetas M, Neofotistou V. Correlation of patient and staff doses in interventional cardiology. Radiat Prot Dosimetry. 117, 26-29 (2005). Balter S. Stray radiation in the cardiac catheterisation laboratory. Radiat Prot Dosimetry. 94, 183-188 (2001). Padovani R, Bernardi G, Quai E, Signor M, Toh HS, Morocutti G, and Spedicato L. Retrospective evaluation of occurrence of...

Mamoru Kato,1,2＊MS, Koichi Chida,2 PhD, Takashi Moritake,3 MD, PhD, Yasuhiro　Koguchi,4MS, Tadaya　Sato,1　MD, Hajime　Oosaka,1　BS, Tetsuo Tosa,1　MS, and Ken Kadowaki,1 MD 1Akita Medical Center, 6-17 Senshukubota, Akita, Akita 010-0874, Japan. 2Tohoku University Graduate School of Medicine. 2-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan. 3University of Tsukuba, 1-1-1 Tennohdai, Tsukuba, Ibaraki 305-8575, Japan 4Oarai Research Center, Chiyoda Technol Corporation, 3681 Naritacho, Higashiibarakigun Oaraimachi, Ibaraki 311-1313, Japan ＊Correspondence to: Mamoru Kato, Department of Medical Technology, Akita Medical Center, 6-17 Senshukubota, Akita, Akita 010-0874, Japan...