Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom

The acquisition and processing of the Jaszczak phantom is a recommended test by the American College of Radiology for evaluation of gamma camera system performance. To produce the reconstructed phantom image for quality evaluation, attenuation correction is applied. The attenuation of counts origina...

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Main Authors: Krishnendu Saha, Sean C Hoyt, Bryon M Murray
Format: Article
Language:English
Published: Wolters Kluwer Medknow Publications 2016-01-01
Series:Journal of Medical Physics
Subjects:
Online Access:http://www.jmp.org.in/article.asp?issn=0971-6203;year=2016;volume=41;issue=1;spage=29;epage=33;aulast=Saha
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spelling doaj-6d93baec78d54431920df531bdb046202020-11-24T23:41:28ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132016-01-01411293310.4103/0971-6203.177278Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantomKrishnendu SahaSean C HoytBryon M MurrayThe acquisition and processing of the Jaszczak phantom is a recommended test by the American College of Radiology for evaluation of gamma camera system performance. To produce the reconstructed phantom image for quality evaluation, attenuation correction is applied. The attenuation of counts originating from the center of the phantom is greater than that originating from the periphery of the phantom causing an artifactual appearance of inhomogeneity in the reconstructed image and complicating phantom evaluation. Chang's mathematical formulation is a common method of attenuation correction applied on most gamma cameras that do not require an external transmission source such as computed tomography, radionuclide sources installed within the gantry of the camera or a flood source. Tomographic acquisition can be obtained in two different acquisition modes for dual-detector gamma camera; one where the two detectors are at 180° configuration and acquire projection images for a full 360°, and the other where the two detectors are positioned at a 90° configuration and acquire projections for only 180°. Though Chang's attenuation correction method has been used for 360° angle acquisition, its applicability for 180° angle acquisition remains a question with one vendor's camera software producing artifacts in the images. This work investigates whether Chang's attenuation correction technique can be applied to both acquisition modes by the development of a Chang's formulation-based algorithm that is applicable to both modes. Assessment of attenuation correction performance by phantom uniformity analysis illustrates improved uniformity with the proposed algorithm (22.6%) compared to the camera software (57.6%).http://www.jmp.org.in/article.asp?issn=0971-6203;year=2016;volume=41;issue=1;spage=29;epage=33;aulast=SahaAmerican College of Radiology testing; attenuation correction; single-photon emission computed tomography
collection DOAJ
language English
format Article
sources DOAJ
author Krishnendu Saha
Sean C Hoyt
Bryon M Murray
spellingShingle Krishnendu Saha
Sean C Hoyt
Bryon M Murray
Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom
Journal of Medical Physics
American College of Radiology testing; attenuation correction; single-photon emission computed tomography
author_facet Krishnendu Saha
Sean C Hoyt
Bryon M Murray
author_sort Krishnendu Saha
title Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom
title_short Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom
title_full Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom
title_fullStr Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom
title_full_unstemmed Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom
title_sort application of chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of jaszczak phantom
publisher Wolters Kluwer Medknow Publications
series Journal of Medical Physics
issn 0971-6203
1998-3913
publishDate 2016-01-01
description The acquisition and processing of the Jaszczak phantom is a recommended test by the American College of Radiology for evaluation of gamma camera system performance. To produce the reconstructed phantom image for quality evaluation, attenuation correction is applied. The attenuation of counts originating from the center of the phantom is greater than that originating from the periphery of the phantom causing an artifactual appearance of inhomogeneity in the reconstructed image and complicating phantom evaluation. Chang's mathematical formulation is a common method of attenuation correction applied on most gamma cameras that do not require an external transmission source such as computed tomography, radionuclide sources installed within the gantry of the camera or a flood source. Tomographic acquisition can be obtained in two different acquisition modes for dual-detector gamma camera; one where the two detectors are at 180° configuration and acquire projection images for a full 360°, and the other where the two detectors are positioned at a 90° configuration and acquire projections for only 180°. Though Chang's attenuation correction method has been used for 360° angle acquisition, its applicability for 180° angle acquisition remains a question with one vendor's camera software producing artifacts in the images. This work investigates whether Chang's attenuation correction technique can be applied to both acquisition modes by the development of a Chang's formulation-based algorithm that is applicable to both modes. Assessment of attenuation correction performance by phantom uniformity analysis illustrates improved uniformity with the proposed algorithm (22.6%) compared to the camera software (57.6%).
topic American College of Radiology testing; attenuation correction; single-photon emission computed tomography
url http://www.jmp.org.in/article.asp?issn=0971-6203;year=2016;volume=41;issue=1;spage=29;epage=33;aulast=Saha
work_keys_str_mv AT krishnendusaha applicationofchangsattenuationcorrectiontechniqueforsinglephotonemissioncomputedtomographypartialangleacquisitionofjaszczakphantom
AT seanchoyt applicationofchangsattenuationcorrectiontechniqueforsinglephotonemissioncomputedtomographypartialangleacquisitionofjaszczakphantom
AT bryonmmurray applicationofchangsattenuationcorrectiontechniqueforsinglephotonemissioncomputedtomographypartialangleacquisitionofjaszczakphantom
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