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[Radiation Exposure in Computed Tomography Localizer Radiograph].

Toshimitsu Sato1, Yuho Kikuchi1,2, Masataka Nakamura1

  • 1Department of Radiology, Yamagata University Hospital.

Nihon Hoshasen Gijutsu Gakkai Zasshi
|December 24, 2019
PubMed
Summary

Computed tomography (CT) localizer radiographs deliver significant radiation exposure, comparable to or exceeding standard chest X-rays. This highlights the need to consider CT localizer dose in patient safety protocols.

Keywords:
chest X-raycomputed tomography localizer radiographeffective energyentrance surface doseradiophotoluminescent glass dosimeter

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Area of Science:

  • Medical Physics
  • Radiological Sciences
  • Diagnostic Imaging

Background:

  • Computed tomography (CT) utilizes localizer radiographs for patient positioning.
  • The radiation dose from these localizer images is often overlooked.
  • Accurate measurement of this dose is crucial for patient safety.

Purpose of the Study:

  • To quantify the entrance surface dose (ESD) of CT localizer radiographs for trunk imaging.
  • To compare these doses against established diagnostic reference levels (DRLs).

Main Methods:

  • Radiophotoluminescent glass dosimeters (RPLDs) were used to measure ESD.
  • Measurements were performed on a 20 cm thick phantom simulating trunk anatomy.
  • Dose was assessed at four points, including the center, with and without the CT bed.

Main Results:

  • ESD for trunk CT localizer radiographs ranged from 0.48 to 0.80 mGy.
  • These doses were significantly higher than Japan DRLs 2015 for chest X-rays (P→A), ranging from 1.60 to 2.67 times higher.
  • The radiation dose from CT localizer radiographs is a considerable factor.

Conclusions:

  • CT localizer radiographs contribute a non-negligible radiation dose.
  • Current localizer doses exceed established reference levels for chest X-rays.
  • Optimization of CT localizer protocols is necessary to reduce patient radiation exposure.