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Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography

Introduction: Digital radiography (DR) possesses a wide dynamic range and has a major advantage in producing an acceptable image of diagnostic value even though overexposure occurs. Lumbar spine (LS) radiography is one of the commonest examinations that give high radiation dose to patients and accou...

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Main Authors: Ramli, Hanis Aisyah, Moey, Soo Foon
Format: Article
Language:English
Published: Iranian Association of Medical Physicists (IAMP) 2019
Subjects:
QC Physics
R Medicine (General)
Online Access:http://irep.iium.edu.my/74618/7/IJMP_Volume%2016_Issue%205_Pages%20368-371%20Hanis%20article.pdf
http://irep.iium.edu.my/74618/
http://ijmp.mums.ac.ir/article_11841.html
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spelling my.iium.irep.746182019-09-23T07:24:20Z http://irep.iium.edu.my/74618/ Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography Ramli, Hanis Aisyah Moey, Soo Foon QC Physics R Medicine (General) Introduction: Digital radiography (DR) possesses a wide dynamic range and has a major advantage in producing an acceptable image of diagnostic value even though overexposure occurs. Lumbar spine (LS) radiography is one of the commonest examinations that give high radiation dose to patients and accounts for the highest collective population dose of any conventional radiographic examination. As such, this study was to ascertain the impact of image quality and entrance surface dose (ESD) with different exposure settings in the antero-posterior (AP) and lateral LS. Materials and Methods: The torso of the PBU-50 phantom was exposed to medium and high kilovoltage (kVp). A total of fourteen images, seven each for AP and lateral LS were obtained. Relative image quality was assessed using Leeds Test Objects TOR (CDR) whilst the entrance surface dose (ESD) was ascertained using the Optically Stimulated Luminescence Dosimeter (OSLD). Results: The Friedman Test indicated a significant difference in image quality when using medium and high kVp; X² (2, N=5) = 23.636, p <0.05. Wilcoxon Signed-Rank Test also reflected a significant difference in ESD between medium and high kVp usage; Z = -2.023, p < 0.05, with higher ESD obtained with medium kVp. Conclusion: Significant differences in image quality and ESD were obtained using medium and high kVp with medium kVp resulting in high contrast but low contrast sensitivity and vice versa. However, lower ESD was obtained with high kVp. The findings of the study indicated that the recommended kVp for AP for LS is from 75kVp to 81kVp whilst for lateral LS, the recommended kVp is from 85kVp to 90kVp for an average adult patient. The usage of the recommended kVp can result in an image of acceptable quality but low ESD consistent with the concept of “as low as reasonably achievable” (ALARA) concept. Iranian Association of Medical Physicists (IAMP) 2019-09-02 Article PeerReviewed application/pdf en http://irep.iium.edu.my/74618/7/IJMP_Volume%2016_Issue%205_Pages%20368-371%20Hanis%20article.pdf Ramli, Hanis Aisyah and Moey, Soo Foon (2019) Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography. Iranian Journal of Medical Physics (16). pp. 368-371. http://ijmp.mums.ac.ir/article_11841.html 10.22038/IJMP.2018.34167.1431
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic QC Physics
R Medicine (General)
spellingShingle QC Physics
R Medicine (General)
Ramli, Hanis Aisyah
Moey, Soo Foon
Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
description Introduction: Digital radiography (DR) possesses a wide dynamic range and has a major advantage in producing an acceptable image of diagnostic value even though overexposure occurs. Lumbar spine (LS) radiography is one of the commonest examinations that give high radiation dose to patients and accounts for the highest collective population dose of any conventional radiographic examination. As such, this study was to ascertain the impact of image quality and entrance surface dose (ESD) with different exposure settings in the antero-posterior (AP) and lateral LS. Materials and Methods: The torso of the PBU-50 phantom was exposed to medium and high kilovoltage (kVp). A total of fourteen images, seven each for AP and lateral LS were obtained. Relative image quality was assessed using Leeds Test Objects TOR (CDR) whilst the entrance surface dose (ESD) was ascertained using the Optically Stimulated Luminescence Dosimeter (OSLD). Results: The Friedman Test indicated a significant difference in image quality when using medium and high kVp; X² (2, N=5) = 23.636, p <0.05. Wilcoxon Signed-Rank Test also reflected a significant difference in ESD between medium and high kVp usage; Z = -2.023, p < 0.05, with higher ESD obtained with medium kVp. Conclusion: Significant differences in image quality and ESD were obtained using medium and high kVp with medium kVp resulting in high contrast but low contrast sensitivity and vice versa. However, lower ESD was obtained with high kVp. The findings of the study indicated that the recommended kVp for AP for LS is from 75kVp to 81kVp whilst for lateral LS, the recommended kVp is from 85kVp to 90kVp for an average adult patient. The usage of the recommended kVp can result in an image of acceptable quality but low ESD consistent with the concept of “as low as reasonably achievable” (ALARA) concept.
format Article
author Ramli, Hanis Aisyah
Moey, Soo Foon
author_facet Ramli, Hanis Aisyah
Moey, Soo Foon
author_sort Ramli, Hanis Aisyah
title Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
title_short Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
title_full Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
title_fullStr Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
title_full_unstemmed Effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
title_sort effects of kilovoltage on image quality and entrance surface dose in lumbar spine digital radiography
publisher Iranian Association of Medical Physicists (IAMP)
publishDate 2019
url http://irep.iium.edu.my/74618/7/IJMP_Volume%2016_Issue%205_Pages%20368-371%20Hanis%20article.pdf
http://irep.iium.edu.my/74618/
http://ijmp.mums.ac.ir/article_11841.html
_version_ 1646012516450435072
score 13.211869

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