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Assessment of air kerma-area product in computed tomography using small solid-state dosemeters
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DOI：10.1093/rpd/ncag010.png)
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Abstract
En 中文
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.
Keywords:
DOSE PROFILES
CT
SIMULATION
TIME
Journal
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0.7
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139
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6.4K
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