Computer simulations and models for the performance characteristics of spectrally equivalent X-ray beams in medical diagnostic radiology
Identifieur interne : 000372 ( Pmc/Curation ); précédent : 000371; suivant : 000373Computer simulations and models for the performance characteristics of spectrally equivalent X-ray beams in medical diagnostic radiology
Auteurs : Akintunde A. Okunade [Nigeria]Source :
- Journal of Medical Physics / Association of Medical Physicists of India [ 0971-6203 ] ; 2007.
Abstract
In order to achieve uniformity in radiological imaging, it is recommended that the concept of equivalence in shape (quality) and size (quantity) of clinical Xray beams should be used for carrying out the comparative evaluation of image and patient dose. When used under the same irradiation geometry, X-ray beams that are strictly or relatively equivalent in terms of shape and size will produce identical or relatively identical image quality and patient dose. Simple mathematical models and software program EQSPECT.FOR were developed for the comparative evaluation of the performance characteristics in terms of contrast (C), contrast to noise ratio (CNR) and figure-of-merit (FOM = CNR2/DOSE) for
Url:
DOI: 10.4103/0971-6203.37483
PubMed: 21224928
PubMed Central: 3014103
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<author><name sortKey="Okunade, Akintunde A" sort="Okunade, Akintunde A" uniqKey="Okunade A" first="Akintunde A." last="Okunade">Akintunde A. Okunade</name>
<affiliation wicri:level="1"><nlm:aff id="AF0001">Department of Physics, Obafemi Awolowo University 220005, Ile-Ife Osun, Nigeria</nlm:aff>
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<author><name sortKey="Okunade, Akintunde A" sort="Okunade, Akintunde A" uniqKey="Okunade A" first="Akintunde A." last="Okunade">Akintunde A. Okunade</name>
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<front><div type="abstract" xml:lang="en"><p>In order to achieve uniformity in radiological imaging, it is recommended that the concept of equivalence in shape (quality) and size (quantity) of clinical Xray beams should be used for carrying out the comparative evaluation of image and patient dose. When used under the same irradiation geometry, X-ray beams that are strictly or relatively equivalent in terms of shape and size will produce identical or relatively identical image quality and patient dose. Simple mathematical models and software program EQSPECT.FOR were developed for the comparative evaluation of the performance characteristics in terms of contrast (C), contrast to noise ratio (CNR) and figure-of-merit (FOM = CNR<sup>2</sup>
/DOSE) for <italic>spectrally</italic>
equivalent beams transmitted through filter materials referred to as conventional and k-edged. At the same value of operating potential (kVp), results show that <italic>spectrally</italic>
equivalent beam transmitted through conventional filter with higher atomic number (<italic>Z</italic>
-value) in comparison with that transmitted through conventional filter with lower <italic>Z</italic>
-value resulted in the same value of C and FOM. However, in comparison with the <italic>spectrally</italic>
equivalent beam transmitted through filter of lower <italic>Z</italic>
-value, the beam through filter of higher <italic>Z</italic>
-value produced higher value of CNR and DOSE at equal tube loading (mAs) and kVp. Under the condition of equivalence of spectrum, at scaled (or reduced) tube loading and same kVp, filter materials of higher <italic>Z</italic>
-value can produce the same values of C, CNR, DOSE and FOM as filter materials of lower <italic>Z</italic>
-value. Unlike the case of comparison of <italic>spectrally</italic>
equivalent beam transmitted through one conventional filter and that through another conventional filter, it is not possible to derive simple mathematical formulations for the relative performance of spectrally equivalent beam transmitted through a given conventional filter material and that through kedge filter material.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Med Phys</journal-id>
<journal-id journal-id-type="publisher-id">JMP</journal-id>
<journal-title-group><journal-title>Journal of Medical Physics / Association of Medical Physicists of India</journal-title>
</journal-title-group>
<issn pub-type="ppub">0971-6203</issn>
<issn pub-type="epub">1998-3913</issn>
<publisher><publisher-name>Medknow Publications</publisher-name>
<publisher-loc>India</publisher-loc>
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<article-meta><article-id pub-id-type="pmid">21224928</article-id>
<article-id pub-id-type="pmc">3014103</article-id>
<article-id pub-id-type="publisher-id">JMP-32-175</article-id>
<article-id pub-id-type="doi">10.4103/0971-6203.37483</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject>
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<title-group><article-title>Computer simulations and models for the performance characteristics of spectrally equivalent X-ray beams in medical diagnostic radiology</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Okunade</surname>
<given-names>Akintunde A.</given-names>
</name>
<xref ref-type="aff" rid="AF0001"></xref>
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<aff id="AF0001">Department of Physics, Obafemi Awolowo University 220005, Ile-Ife Osun, Nigeria</aff>
<author-notes><corresp id="cor1"><bold>Address for correspondence:</bold>
Dr. Akintunde A. Okunade, Department of Physics, Obafemi Awolowo University 220005, Ile-Ife Osun, State Nigeria. E-mail: <email xlink:href="aokunade@oauife.edu.ng">aokunade@oauife.edu.ng</email>
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</author-notes>
<pub-date pub-type="ppub"><season>Oct-Dec</season>
<year>2007</year>
</pub-date>
<volume>32</volume>
<issue>4</issue>
<fpage>175</fpage>
<lpage>184</lpage>
<history><date date-type="received"><day>10</day>
<month>2</month>
<year>2007</year>
</date>
<date date-type="accepted"><day>06</day>
<month>10</month>
<year>2007</year>
</date>
</history>
<permissions><copyright-statement>© Journal of Medical Physics</copyright-statement>
<copyright-year>2007</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0/"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
</license>
</permissions>
<abstract><p>In order to achieve uniformity in radiological imaging, it is recommended that the concept of equivalence in shape (quality) and size (quantity) of clinical Xray beams should be used for carrying out the comparative evaluation of image and patient dose. When used under the same irradiation geometry, X-ray beams that are strictly or relatively equivalent in terms of shape and size will produce identical or relatively identical image quality and patient dose. Simple mathematical models and software program EQSPECT.FOR were developed for the comparative evaluation of the performance characteristics in terms of contrast (C), contrast to noise ratio (CNR) and figure-of-merit (FOM = CNR<sup>2</sup>
/DOSE) for <italic>spectrally</italic>
equivalent beams transmitted through filter materials referred to as conventional and k-edged. At the same value of operating potential (kVp), results show that <italic>spectrally</italic>
equivalent beam transmitted through conventional filter with higher atomic number (<italic>Z</italic>
-value) in comparison with that transmitted through conventional filter with lower <italic>Z</italic>
-value resulted in the same value of C and FOM. However, in comparison with the <italic>spectrally</italic>
equivalent beam transmitted through filter of lower <italic>Z</italic>
-value, the beam through filter of higher <italic>Z</italic>
-value produced higher value of CNR and DOSE at equal tube loading (mAs) and kVp. Under the condition of equivalence of spectrum, at scaled (or reduced) tube loading and same kVp, filter materials of higher <italic>Z</italic>
-value can produce the same values of C, CNR, DOSE and FOM as filter materials of lower <italic>Z</italic>
-value. Unlike the case of comparison of <italic>spectrally</italic>
equivalent beam transmitted through one conventional filter and that through another conventional filter, it is not possible to derive simple mathematical formulations for the relative performance of spectrally equivalent beam transmitted through a given conventional filter material and that through kedge filter material.</p>
</abstract>
<kwd-group><kwd>Contrast</kwd>
<kwd>elemental filters</kwd>
<kwd>medical diagnostic radiology</kwd>
</kwd-group>
</article-meta>
</front>
</pmc>
</record>
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