Digital zoom is a useful, simple, and cost-effective method of reducing radiation exposure in percutaneous coronary inte
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ORIGINAL ARTICLE
Digital zoom is a useful, simple, and cost‑effective method of reducing radiation exposure in percutaneous coronary intervention Kenji Hasegawa1 · Norio Umemoto2 · Sho Inoue2 · Yuri Iio2 · Naoki Shibata2 · Takashi Mizutani2 · Akinori Sawamura1,3 · Tsuyoshi Sugiura2 · Toshio Taniguchi2 · Toru Asai2 · Michiharu Yamada2 · Hideki Ishii3 · Toyoaki Murohara3 · Kiyokazu Shimizu2 Received: 17 May 2019 / Accepted: 30 December 2019 © Japanese Association of Cardiovascular Intervention and Therapeutics 2020
Abstract Reducing radiation exposure is a very important issue in interventional cardiology techniques such as percutaneous coronary intervention. Although novel techniques to reduce radiation exposure are valuable, we should also reconsider older techniques. Digital zoom has been available in Japan from 2005. Digital zoom enlarges an 8-inch field of view (FOV) by 1.2 times, allowing visualization of a 6.7-inch FOV without FOV switching. We identified 2101 suitable cases of percutaneous intervention (PCI) and divided them into two groups according to the use of digital zoom; 1195 patients were included in the digital zoom group and 906 patients in the conventional group. We collected data regarding the reference air kerma (RAK) and dose-area product (DAP). We calculated RAK and DAP per minute fluoroscope time (RAK/min, DAP/min, respectively). There were intergroup differences in RAK, DAP, RAK/min, and DAP/min (digital zoom group vs conventional group; RAK, 1590 mGy [990–2410] vs 1850 [1220–2720], p
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