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

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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 1 2019

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tomography
ionization
Tomography
Head
dose
evaluation
index
detector

All Science Journal Classification (ASJC) codes

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

Cite this

An evaluation of computed tomography dose index measurements using a pencil ionisation chamber and small detectors. / Anam, Choirul; Fujibuchi, Toshioh; Haryanto, Freddy; Widita, Rena; Arif, Idam; Dougherty, Geoff.

In: Journal of Radiological Protection, Vol. 39, No. 1, 01.03.2019, p. 112-124.

Research output: Contribution to journalArticle

Anam, Choirul ; Fujibuchi, Toshioh ; Haryanto, Freddy ; Widita, Rena ; Arif, Idam ; Dougherty, Geoff. / An evaluation of computed tomography dose index measurements using a pencil ionisation chamber and small detectors. In: Journal of Radiological Protection. 2019 ; Vol. 39, No. 1. pp. 112-124.
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