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Assessment of air kerma–area product in computed tomography using small solid-state dosemeters

Beganović, Adnan ; Čiva, Lejla M. ; Redžić, Mahira ; Skopljak-Beganović, Amra ; Herrnsdorf, Lars LU and Mattsson, Sören LU (2026) In Radiation Protection Dosimetry 202(3-4). p.358-370
Abstract

Technological advances in computed tomography (CT) have highlighted limitations of traditional dose descriptors such as computed tomography dose indexvol and dose-length product, particularly for wide-beam and modulated acquisitions. This study investigates a CT-specific, operational air kerma–area product derived from time-resolved measurements using small solid-state dosemeters mounted at the gantry aperture. A mathematical framework is presented that accounts for tube rotation, bow-tie filtration, beam geometry, and the longitudinal dose profile. Model validation was performed using measured air-kerma rate waveforms under free-in-air and phantom conditions, demonstrating that a reproducible kerma–area quantity can be... (More)

Technological advances in computed tomography (CT) have highlighted limitations of traditional dose descriptors such as computed tomography dose indexvol and dose-length product, particularly for wide-beam and modulated acquisitions. This study investigates a CT-specific, operational air kerma–area product derived from time-resolved measurements using small solid-state dosemeters mounted at the gantry aperture. A mathematical framework is presented that accounts for tube rotation, bow-tie filtration, beam geometry, and the longitudinal dose profile. Model validation was performed using measured air-kerma rate waveforms under free-in-air and phantom conditions, demonstrating that a reproducible kerma–area quantity can be derived from fixed-detector measurements. By excluding the kerma–area contribution associated with radiation that does not intersect the object, the proposed approach yields a quantity that is more closely related to patient-incident radiation than conventional output-based KAP concepts in CT. The methodology provides a practical tool for system characterization and quality control in CT dosimetry.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Radiation Protection Dosimetry
volume
202
issue
3-4
pages
13 pages
publisher
Oxford University Press
external identifiers
  • scopus:105032790138
  • pmid:41821450
ISSN
0144-8420
DOI
10.1093/rpd/ncag010
language
English
LU publication?
yes
additional info
Publisher Copyright: © The Author(s) 2026. Published by Oxford University Press. All rights reserved.
id
c8f92a48-d1e2-4b60-b155-2e663f575ca1
date added to LUP
2026-05-06 15:23:32
date last changed
2026-06-03 17:18:30
@article{c8f92a48-d1e2-4b60-b155-2e663f575ca1,
  abstract     = {{<p>Technological advances in computed tomography (CT) have highlighted limitations of traditional dose descriptors such as computed tomography dose index<sub>vol</sub> and dose-length product, particularly for wide-beam and modulated acquisitions. This study investigates a CT-specific, operational air kerma–area product derived from time-resolved measurements using small solid-state dosemeters mounted at the gantry aperture. A mathematical framework is presented that accounts for tube rotation, bow-tie filtration, beam geometry, and the longitudinal dose profile. Model validation was performed using measured air-kerma rate waveforms under free-in-air and phantom conditions, demonstrating that a reproducible kerma–area quantity can be derived from fixed-detector measurements. By excluding the kerma–area contribution associated with radiation that does not intersect the object, the proposed approach yields a quantity that is more closely related to patient-incident radiation than conventional output-based KAP concepts in CT. The methodology provides a practical tool for system characterization and quality control in CT dosimetry.</p>}},
  author       = {{Beganović, Adnan and Čiva, Lejla M. and Redžić, Mahira and Skopljak-Beganović, Amra and Herrnsdorf, Lars and Mattsson, Sören}},
  issn         = {{0144-8420}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3-4}},
  pages        = {{358--370}},
  publisher    = {{Oxford University Press}},
  series       = {{Radiation Protection Dosimetry}},
  title        = {{Assessment of air kerma–area product in computed tomography using small solid-state dosemeters}},
  url          = {{http://dx.doi.org/10.1093/rpd/ncag010}},
  doi          = {{10.1093/rpd/ncag010}},
  volume       = {{202}},
  year         = {{2026}},
}