Optimisation of swallowing ct examination: Dose reduction and image quality

Masanao Kobayashi, Yasuki Asada, Tomonobu Haba, Yuta Matsunaga, Kosuke Matsubara, Kazuyuki Minami

Research output: Contribution to journalArticle

Abstract

This study sought to optimise the swallowing computed tomography (SCT) scan protocol for use with the new wide-area detector-row CT (ADCT) scanner and to estimate patient dose in terms of the organ-absorbed dose and the effective dose. The conventional ADCT (ADCTViSION) and the new ADCT (ADCTGENESIS) scanner were compared using: (1) the organ-absorbed dose and the effective dose, with a phantom study, (2) the detailed organ-absorbed doses of the neck region, using a Monte Carlo simulation and (3) a relative visual quality analysis. The effective energy differed significantly between the ADCTViSION (50 keV) and the ADCTGENESIS (57 keV). The effective doses were 2.9 and 1.9 mSv, respectively. Compared with the ADCTViSION, the absorbed dose was reduced by 34% with the ADCTGENESIS. With the ADCTGENESIS, the tube current could be reduced from 40 to 30 mA. With the optimised scan protocol, a further 25% dose reduction can be achieved.

Original languageEnglish
Pages (from-to)421-431
Number of pages11
JournalRadiation protection dosimetry
Volume185
Issue number4
DOIs
Publication statusPublished - 31-12-2019

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All Science Journal Classification (ASJC) codes

  • Radiation
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Public Health, Environmental and Occupational Health

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