Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa

Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa

The value of using lead filters to improve the quality of PET data has been investigated for a CTI/Siemens 953B brain scanner operated without septa. The filters consisted of sheets of thickness 0.5mm and 1.0mm and axial width 18cm which were placed around the outer surface of the patient port. Th...

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Main Authors: Spinks, Terry Jones, Sayed, Inayatullah Shah
Format: Article
Language:English
Published: IEEE 1993
Subjects:
QC Physics
Online Access:http://irep.iium.edu.my/6061/
http://irep.iium.edu.my/6061/
http://irep.iium.edu.my/6061/1/Lead_filters_NeuroPET.pdf
id iium-6061
recordtype eprints
spelling iium-60612013-07-10T07:20:24Z http://irep.iium.edu.my/6061/ Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa Spinks, Terry Jones Sayed, Inayatullah Shah QC Physics The value of using lead filters to improve the quality of PET data has been investigated for a CTI/Siemens 953B brain scanner operated without septa. The filters consisted of sheets of thickness 0.5mm and 1.0mm and axial width 18cm which were placed around the outer surface of the patient port. The port diameter is 35 cm and the axial FOV 10.65cm. The ratios of dead times (with/without filter) with lmCi (20cm uniform cylinder) in the FOV are 0.92 (0.5mm) and 0.82 (1mm) at a lower threshold (LLD) of 380keV; the values at 15OkeV are 0.87 and 0.76. Randoms rates are reduced by 12% (0.5mm)and 27% (1mm) at a LLD of 38OkeV and by 20% and 40% at 150keV. These values reflect the significant reduction of lower energy events observed in the measured energy spectrum. However, these reductions are accompanied by a drop in the true coincidence rate such that NEC is reduced for count rates up to the maximum measured trues rate at lower thresholds of 380 keV and 150 keV. It is concluded that the filters used in this study provide no advantage in the performance of the tomograph. IEEE 1993-08 Article PeerReviewed application/pdf en http://irep.iium.edu.my/6061/1/Lead_filters_NeuroPET.pdf Spinks, Terry Jones and Sayed, Inayatullah Shah (1993) Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa. IEEE Transactions on Nuclear Science, 40 (4). pp. 1087-1091. ISSN 0018-9499 http://ewh.ieee.org/soc/nps/TNS.htm
repository_type Digital Repository
institution_category Local University
institution International Islamic University Malaysia
building IIUM Repository
collection Online Access
language English
topic QC Physics
spellingShingle QC Physics
Spinks, Terry Jones
Sayed, Inayatullah Shah
Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa
description The value of using lead filters to improve the quality of PET data has been investigated for a CTI/Siemens 953B brain scanner operated without septa. The filters consisted of sheets of thickness 0.5mm and 1.0mm and axial width 18cm which were placed around the outer surface of the patient port. The port diameter is 35 cm and the axial FOV 10.65cm. The ratios of dead times (with/without filter) with lmCi (20cm uniform cylinder) in the FOV are 0.92 (0.5mm) and 0.82 (1mm) at a lower threshold (LLD) of 380keV; the values at 15OkeV are 0.87 and 0.76. Randoms rates are reduced by 12% (0.5mm)and 27% (1mm) at a LLD of 38OkeV and by 20% and 40% at 150keV. These values reflect the significant reduction of lower energy events observed in the measured energy spectrum. However, these reductions are accompanied by a drop in the true coincidence rate such that NEC is reduced for count rates up to the maximum measured trues rate at lower thresholds of 380 keV and 150 keV. It is concluded that the filters used in this study provide no advantage in the performance of the tomograph.
format Article
author Spinks, Terry Jones
Sayed, Inayatullah Shah
author_facet Spinks, Terry Jones
Sayed, Inayatullah Shah
author_sort Spinks, Terry Jones
title Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa
title_short Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa
title_full Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa
title_fullStr Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa
title_full_unstemmed Effect of lead filters on the performance of a neuro-pet tomograph operated without Septa
title_sort effect of lead filters on the performance of a neuro-pet tomograph operated without septa
publisher IEEE
publishDate 1993
url http://irep.iium.edu.my/6061/
http://irep.iium.edu.my/6061/
http://irep.iium.edu.my/6061/1/Lead_filters_NeuroPET.pdf
first_indexed 2023-09-18T20:14:54Z
last_indexed 2023-09-18T20:14:54Z
_version_ 1777407722072834048

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