Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE

The purpose of this work is to evaluate the impacts of body off-center positioning on CT numbers and dose index CTDIv of two scanners from GE. HD750 and APEX scanners were used to acquire a PBU60 phantom of Kagaku and a 062M phantom of CIRS respectively. CT images were acquired at various off-center...

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Autores principales:	Xiaoming Zheng, Lachlan Gutsche, Yazan Al-Hayek, Johanna Stanton, Wiam Elshami, Kelsey Jensen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	dose CTDIv CT numbers off-center positioning scan projection radiograph Photography TR1-1050 Computer applications to medicine. Medical informatics R858-859.7 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/153528a46b134155963afa502d27db6f
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spelling	oai:doaj.org-article:153528a46b134155963afa502d27db6f2021-11-25T18:03:29ZImpacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE10.3390/jimaging71102352313-433Xhttps://doaj.org/article/153528a46b134155963afa502d27db6f2021-11-01T00:00:00Zhttps://www.mdpi.com/2313-433X/7/11/235https://doaj.org/toc/2313-433XThe purpose of this work is to evaluate the impacts of body off-center positioning on CT numbers and dose index CTDIv of two scanners from GE. HD750 and APEX scanners were used to acquire a PBU60 phantom of Kagaku and a 062M phantom of CIRS respectively. CT images were acquired at various off-center positions under automatic tube current modulation using various peak voltages. CTDIv were recorded for each of the acquisitions. An abdomen section of the PBU60 phantom was used for CT number analysis and tissue inserts of the 062M phantom were filled with water balloons to mimic the human abdomen. CT numbers of central regions of interests were averaged using the Fiji software. As phantoms were lifted above the iso-center, both CTDIv and CT numbers were increased for the HD750 scanner whilst they were approximately constant for the APEX scanner. The measured sizes of anterior-posterior projection images were also increased for both scanners whilst the sizes of lateral projection images were increased for the HD750 scanner but decreased for the APEX scanner. Off-center correction algorithms were implemented in the APEX scanner. Matching the X-ray projection center with the system’s iso-center could improve the accuracy of CT imaging.Xiaoming ZhengLachlan GutscheYazan Al-HayekJohanna StantonWiam ElshamiKelsey JensenMDPI AGarticledose CTDIvCT numbersoff-center positioningscan projection radiographPhotographyTR1-1050Computer applications to medicine. Medical informaticsR858-859.7Electronic computers. Computer scienceQA75.5-76.95ENJournal of Imaging, Vol 7, Iss 235, p 235 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	dose CTDIv CT numbers off-center positioning scan projection radiograph Photography TR1-1050 Computer applications to medicine. Medical informatics R858-859.7 Electronic computers. Computer science QA75.5-76.95
spellingShingle	dose CTDIv CT numbers off-center positioning scan projection radiograph Photography TR1-1050 Computer applications to medicine. Medical informatics R858-859.7 Electronic computers. Computer science QA75.5-76.95 Xiaoming Zheng Lachlan Gutsche Yazan Al-Hayek Johanna Stanton Wiam Elshami Kelsey Jensen Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE
description	The purpose of this work is to evaluate the impacts of body off-center positioning on CT numbers and dose index CTDIv of two scanners from GE. HD750 and APEX scanners were used to acquire a PBU60 phantom of Kagaku and a 062M phantom of CIRS respectively. CT images were acquired at various off-center positions under automatic tube current modulation using various peak voltages. CTDIv were recorded for each of the acquisitions. An abdomen section of the PBU60 phantom was used for CT number analysis and tissue inserts of the 062M phantom were filled with water balloons to mimic the human abdomen. CT numbers of central regions of interests were averaged using the Fiji software. As phantoms were lifted above the iso-center, both CTDIv and CT numbers were increased for the HD750 scanner whilst they were approximately constant for the APEX scanner. The measured sizes of anterior-posterior projection images were also increased for both scanners whilst the sizes of lateral projection images were increased for the HD750 scanner but decreased for the APEX scanner. Off-center correction algorithms were implemented in the APEX scanner. Matching the X-ray projection center with the system’s iso-center could improve the accuracy of CT imaging.
format	article
author	Xiaoming Zheng Lachlan Gutsche Yazan Al-Hayek Johanna Stanton Wiam Elshami Kelsey Jensen
author_facet	Xiaoming Zheng Lachlan Gutsche Yazan Al-Hayek Johanna Stanton Wiam Elshami Kelsey Jensen
author_sort	Xiaoming Zheng
title	Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE
title_short	Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE
title_full	Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE
title_fullStr	Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE
title_full_unstemmed	Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE
title_sort	impacts of phantom off-center positioning on ct numbers and dose index ctdiv: an evaluation of two ct scanners from ge
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/153528a46b134155963afa502d27db6f
work_keys_str_mv	AT xiaomingzheng impactsofphantomoffcenterpositioningonctnumbersanddoseindexctdivanevaluationoftwoctscannersfromge AT lachlangutsche impactsofphantomoffcenterpositioningonctnumbersanddoseindexctdivanevaluationoftwoctscannersfromge AT yazanalhayek impactsofphantomoffcenterpositioningonctnumbersanddoseindexctdivanevaluationoftwoctscannersfromge AT johannastanton impactsofphantomoffcenterpositioningonctnumbersanddoseindexctdivanevaluationoftwoctscannersfromge AT wiamelshami impactsofphantomoffcenterpositioningonctnumbersanddoseindexctdivanevaluationoftwoctscannersfromge AT kelseyjensen impactsofphantomoffcenterpositioningonctnumbersanddoseindexctdivanevaluationoftwoctscannersfromge
_version_	1718411664715415552

Impacts of Phantom Off-Center Positioning on CT Numbers and Dose Index CTDIv: An Evaluation of Two CT Scanners from GE

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