Reduction of operator exposure by rectangular collimation in portable intraoral radiography
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Reduction of operator exposure by rectangular collimation in portable intraoral radiography Yusei Otaka1 · Yasuo Harata1 · Maki Izawa1 · Atsushi Iwawaki2 · Takeru Ishii2 · Hideki Saka2,3 · Shinji Kito1 Received: 10 October 2019 / Revised: 13 June 2020 / Accepted: 22 June 2020 © Japanese Society of Radiological Technology and Japan Society of Medical Physics 2020
Abstract Portable intraoral X-ray units are frequently used for home-visit dental treatment and personal dental identification. Therefore, the reduction of operator exposure is crucial. Rectangular collimation is effective at reducing patient exposure and operator exposure; however, its effects are not known. We investigated the reduction of operator exposure through rectangular collimation by measuring the backscattered dose in relation to the operator exposure dose. Using a portable intraoral X-ray unit, a head phantom for CT dose measurement as the object, a dosimeter, and stainless-steel rectangular collimator, a 1-cm ambient dose equivalent was measured in intervals of 15° in horizontal and vertical planes with the radii of 50 and 100 cm. The backscattered dose decreased to approximately one-third when a rectangular collimator was attached to the cone tip. This may have been due to the reduction of the volume of scattered X-rays generated in the phantom by rectangular collimation. We clarified that rectangular collimation is effective at reducing the operator exposure and is useful for protecting the operators of portable intraoral X-ray units during home-visit dental treatment and personal dental identification. Keywords Rectangular collimation · Portable intraoral X-ray unit · Operator exposure · Home-visit dental treatment · Personal dental identification
1 Introduction * Yusei Otaka y‑[email protected] Yasuo Harata [email protected] Maki Izawa [email protected] Atsushi Iwawaki [email protected] Takeru Ishii [email protected] Hideki Saka [email protected] Shinji Kito [email protected] 1
Division of Dental Radiology, Department of Diagnostic and Therapeutic Sciences, Meikai University School of Dentistry, Saitama, Japan
2
Division of Forensic Odontology, Department of Diagnostic and Therapeutic Sciences, Meikai University School of Dentistry, Saitama, Japan
3
Forensic Odontology Center, Meikai University School of Dentistry, Saitama, Japan
Portable intraoral X-ray units are used widely and frequently for home-visit dental treatment and personal dental identification [1–6]. When a portable intraoral X-ray unit is used, an extension cord for X-ray switching is required to apply radiation at 2 m from the object [7]. Thus, the operator exposure should be maintained low. However, extension cords are not always used in actual practice and the operator exposure needs to be reduced [8, 9] (Fig. 1). Rectangular collimation is widely used for reducing patient exposure in intraoral radiography [10]. Compared with the use of general round collimation (6 cm in diameter; round radiation field), the
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