Cargando…
Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system
PURPOSE: This study aimed to evaluate the effect of equalization filters (EFs) on the kerma‐area product ([Formula: see text]) and incident air‐kerma ([Formula: see text]) using a kerma‐area product (KAP) meter. In addition, potential underestimations of the [Formula: see text] values by EFs were id...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8664145/ https://www.ncbi.nlm.nih.gov/pubmed/34610646 http://dx.doi.org/10.1002/acm2.13444 |
_version_ | 1784613785202327552 |
---|---|
author | Ichikawa, Nao Fukuda, Atsushi Hayashi, Takuma Matsubara, Kosuke |
author_facet | Ichikawa, Nao Fukuda, Atsushi Hayashi, Takuma Matsubara, Kosuke |
author_sort | Ichikawa, Nao |
collection | PubMed |
description | PURPOSE: This study aimed to evaluate the effect of equalization filters (EFs) on the kerma‐area product ([Formula: see text]) and incident air‐kerma ([Formula: see text]) using a kerma‐area product (KAP) meter. In addition, potential underestimations of the [Formula: see text] 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‐cm(3) external ionization chamber was placed to measure incident air‐kerma ([Formula: see text]) at PERP instead of the portable FPD. KAP reading and [Formula: see text] were simultaneously measured at several X‐ray beam qualities with and without EFs. The X‐ray beam quality correction factor by KAP meter ([Formula: see text]) was calculated by A, [Formula: see text] and KAP reading to acquire the [Formula: see text] and [Formula: see text]. Upon completion of the measurements, [Formula: see text] , [Formula: see text] , and [Formula: see text] were plotted as functions of tube potential, spectral filter, and EFs dimension. Moreover, [Formula: see text] values were calculated to evaluate the [Formula: see text] underestimation. RESULTS: The [Formula: see text] values increased with an increase in the X‐ray tube potential and spectral filter, and the maximum [Formula: see text] was 1.18. [Formula: see text] and [Formula: see text] decreased as functions of EFs dimension, whereas [Formula: see text] was almost constant. [Formula: see text] 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: [Formula: see text] value was up to approximately two times lower than the [Formula: see text] values by EFs. When using the [Formula: see text] value, the potential [Formula: see text] underestimation with EFs should be considered. |
format | Online Article Text |
id | pubmed-8664145 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-86641452021-12-21 Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system Ichikawa, Nao Fukuda, Atsushi Hayashi, Takuma Matsubara, Kosuke J Appl Clin Med Phys Radiation Measurements PURPOSE: This study aimed to evaluate the effect of equalization filters (EFs) on the kerma‐area product ([Formula: see text]) and incident air‐kerma ([Formula: see text]) using a kerma‐area product (KAP) meter. In addition, potential underestimations of the [Formula: see text] 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‐cm(3) external ionization chamber was placed to measure incident air‐kerma ([Formula: see text]) at PERP instead of the portable FPD. KAP reading and [Formula: see text] were simultaneously measured at several X‐ray beam qualities with and without EFs. The X‐ray beam quality correction factor by KAP meter ([Formula: see text]) was calculated by A, [Formula: see text] and KAP reading to acquire the [Formula: see text] and [Formula: see text]. Upon completion of the measurements, [Formula: see text] , [Formula: see text] , and [Formula: see text] were plotted as functions of tube potential, spectral filter, and EFs dimension. Moreover, [Formula: see text] values were calculated to evaluate the [Formula: see text] underestimation. RESULTS: The [Formula: see text] values increased with an increase in the X‐ray tube potential and spectral filter, and the maximum [Formula: see text] was 1.18. [Formula: see text] and [Formula: see text] decreased as functions of EFs dimension, whereas [Formula: see text] was almost constant. [Formula: see text] 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: [Formula: see text] value was up to approximately two times lower than the [Formula: see text] values by EFs. When using the [Formula: see text] value, the potential [Formula: see text] underestimation with EFs should be considered. John Wiley and Sons Inc. 2021-10-05 /pmc/articles/PMC8664145/ /pubmed/34610646 http://dx.doi.org/10.1002/acm2.13444 Text en © 2021 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, LLC on behalf of The American Association of Physicists in Medicine https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Radiation Measurements Ichikawa, Nao Fukuda, Atsushi Hayashi, Takuma Matsubara, Kosuke Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
title | Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
title_full | Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
title_fullStr | Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
title_full_unstemmed | Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
title_short | Effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
title_sort | effect of equalization filters on measurements with kerma‐area product meter in a cardiovascular angiography system |
topic | Radiation Measurements |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8664145/ https://www.ncbi.nlm.nih.gov/pubmed/34610646 http://dx.doi.org/10.1002/acm2.13444 |
work_keys_str_mv | AT ichikawanao effectofequalizationfiltersonmeasurementswithkermaareaproductmeterinacardiovascularangiographysystem AT fukudaatsushi effectofequalizationfiltersonmeasurementswithkermaareaproductmeterinacardiovascularangiographysystem AT hayashitakuma effectofequalizationfiltersonmeasurementswithkermaareaproductmeterinacardiovascularangiographysystem AT matsubarakosuke effectofequalizationfiltersonmeasurementswithkermaareaproductmeterinacardiovascularangiographysystem |