An evaluation of computed tomography dose index measurements using a pencil ionisation chamber and small detectors

Choirul Anam, Toshioh Fujibuchi, Freddy Haryanto, Rena Widita, Idam Arif, Geoff Dougherty

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The aim of this study was to compare the values of the computed tomography dose index 100 (CTDI100) obtained using two small detectors (i.e. a small ionisation chamber and a small solid state detector) with those obtained from a 100 mm pencil ionisation chamber for various input CT parameters: beam width, kVp, mAs, pitch, and head-body phantom variation. The measurement of CTDI100 using the 100 mm pencil chamber was carried out in a single rotation of axial mode, while the measurement using small detectors was carried out in helical mode. The differences of CTDI100 values obtained with two small detectors were about 7% for all variations. The differences of CTDI100 values obtained with small detectors and a 100 mm pencil ionisation chamber for beam widths of more than 4 mm were within 40%. However, for the narrowest beam widths (4 mm), the difference between them was very large (about 150%).

Original languageEnglish
Pages (from-to)112-124
Number of pages13
JournalJournal of Radiological Protection
Volume39
Issue number1
DOIs
Publication statusPublished - Mar 2019

All Science Journal Classification (ASJC) codes

  • Waste Management and Disposal
  • Public Health, Environmental and Occupational Health

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