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- Title
Effect of equalization filters on measurements with kerma-area product meter in a cardiovascular angiography system.
- Authors
Nao Ichikawa; Atsushi Fukuda; Takuma Hayashi; Kosuke Matsubara
- Abstract
Purpose: This study aimed to evaluate the effect of equalization filters (EFs) on the kerma-area product (...) and incident air-kerma (...) using a kermaarea product (KAP) meter. In addition, potential underestimations of the ... values by EFs were identified. Materials and methods: A portable flat-panel detector (FPD) was placed to measure the X-ray beam area (A) and EFs dimension at patient entrance reference point (PERP).Afterward, a 6-cm³ external ionization chamber was placed to measure incident air-kerma (...) at PERP instead of the portable FPD. KAP reading and ... were simultaneously measured at several X-ray beam qualities with and without EFs.The X-ray beam quality correction factor by KAP meter (...) was calculated by ... and KAP reading to acquire the ... and ....Upon completion of the measurements, ..., ..., and ... were plotted as functions of tube potential, spectral filter, and EFs dimension. Moreover, .../... values were calculated to evaluate the ... underestimation. Results: The ... values increased with an increase in the X-ray tube potential and spectral filter, and the maximum ... was 1.18. ... and ... decreased as functions of EFs dimension, whereas ... was almost constant. .../... decreased with an increase in EFs dimension but increased with an increase in tube potential and spectral filter, and the range was 0.55--1.01. Conclusions: ... value was up to approximately two times lower than the ... values by EFs.When using the ... value, the potential ... underestimation with EFs should be considered.
- Subjects
CARDIOVASCULAR system; IONIZATION chambers; CORRECTION factors; X-ray tubes; PERCUTANEOUS coronary intervention
- Publication
Journal of Applied Clinical Medical Physics, 2021, Vol 22, Issue 12, p177
- ISSN
1526-9914
- Publication type
Article
- DOI
10.1002/acm2.13444