Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera

Single photon emission computed tomography (SPECT) imaging inherits some limitations, i.e., due to scattered gamma photons which degrade spatial resolution causes poor image quality. This study attempts to reduce a fraction of scattered gamma photons before reaching gamma camera detector by using Fe...

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Main Authors:	Sohaimi, Norhanna, Abdullah, Nazifah, Shah, Sayed Inayatullah, Zakaria, Ahmad
Format:	Article
Language:	English English
Published:	Institute of Physics Publishing (UK) 2014
Subjects:	QC Physics
Online Access:	http://irep.iium.edu.my/39997/ http://irep.iium.edu.my/39997/ http://irep.iium.edu.my/39997/ http://irep.iium.edu.my/39997/1/Effect_of_Fe_as_a_physical_filter....pdf http://irep.iium.edu.my/39997/3/39997_Effects%20of%20Fe%20as%20a%20physical%20filter%20on%20spectra_SCOPUS.pdf

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spelling	iium-399972017-09-19T02:41:58Z http://irep.iium.edu.my/39997/ Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera Sohaimi, Norhanna Abdullah, Nazifah Shah, Sayed Inayatullah Zakaria, Ahmad QC Physics Single photon emission computed tomography (SPECT) imaging inherits some limitations, i.e., due to scattered gamma photons which degrade spatial resolution causes poor image quality. This study attempts to reduce a fraction of scattered gamma photons before reaching gamma camera detector by using Fe sheet (0.35 mm and 0.40 mm) as a physical filter. Also investigate the effects on spectra of Tc-99m, spatial resolution, system volume sensitivity and uniformity. The thickness of Fe physical filter is selected on the basis of percentage attenuation calculations of different gamma ray energies by various thicknesses of material. Data were acquired using Philip ADAC forte dual-head gamma camera without and with physical filter with LEHR collimator installed. For spectra, uniformity and system volume sensitivity, a cylindrical source tank filled with water added with Tc-99m was scanned. Uniformity and system volume sensitivity images were reconstructed with FBP method by applying Butterworth filter of order 5, cut-off frequency 0.35cycles/cm and Chang’s attenuation correction method using 0.13 cm-1 linear attenuation coefficient. Spatial resolution study was done by scanning a line source (0.8 mm inner diameter) of Tc-99m at various source-to-collimator distances in air and in scattering medium without and with physical filter. A substantial reduction in count rate from Compton and photopeak regions of Tc-99m spectra with physical filter is recorded. Improvement in spatial resolution with physical filter up to 4 cm source-to-collimator distance is obtained. System volume sensitivity was reduced and no improvement in uniformity. These thicknesses of physical filter may be tested further by scanning different planar/SPECT phantoms in Tc-99m imaging. Institute of Physics Publishing (UK) 2014 Article PeerReviewed application/pdf en http://irep.iium.edu.my/39997/1/Effect_of_Fe_as_a_physical_filter....pdf application/pdf en http://irep.iium.edu.my/39997/3/39997_Effects%20of%20Fe%20as%20a%20physical%20filter%20on%20spectra_SCOPUS.pdf Sohaimi, Norhanna and Abdullah, Nazifah and Shah, Sayed Inayatullah and Zakaria, Ahmad (2014) Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera. Journal of Physics: Conference Series, 546 (1). pp. 1-7. ISSN 1742-6588 (P), 1742-6596 (O) http://iopscience.iop.org/ 10.1088/1742-6596/546/1/012009
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	QC Physics
spellingShingle	QC Physics Sohaimi, Norhanna Abdullah, Nazifah Shah, Sayed Inayatullah Zakaria, Ahmad Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera
description	Single photon emission computed tomography (SPECT) imaging inherits some limitations, i.e., due to scattered gamma photons which degrade spatial resolution causes poor image quality. This study attempts to reduce a fraction of scattered gamma photons before reaching gamma camera detector by using Fe sheet (0.35 mm and 0.40 mm) as a physical filter. Also investigate the effects on spectra of Tc-99m, spatial resolution, system volume sensitivity and uniformity. The thickness of Fe physical filter is selected on the basis of percentage attenuation calculations of different gamma ray energies by various thicknesses of material. Data were acquired using Philip ADAC forte dual-head gamma camera without and with physical filter with LEHR collimator installed. For spectra, uniformity and system volume sensitivity, a cylindrical source tank filled with water added with Tc-99m was scanned. Uniformity and system volume sensitivity images were reconstructed with FBP method by applying Butterworth filter of order 5, cut-off frequency 0.35cycles/cm and Chang’s attenuation correction method using 0.13 cm-1 linear attenuation coefficient. Spatial resolution study was done by scanning a line source (0.8 mm inner diameter) of Tc-99m at various source-to-collimator distances in air and in scattering medium without and with physical filter. A substantial reduction in count rate from Compton and photopeak regions of Tc-99m spectra with physical filter is recorded. Improvement in spatial resolution with physical filter up to 4 cm source-to-collimator distance is obtained. System volume sensitivity was reduced and no improvement in uniformity. These thicknesses of physical filter may be tested further by scanning different planar/SPECT phantoms in Tc-99m imaging.
format	Article
author	Sohaimi, Norhanna Abdullah, Nazifah Shah, Sayed Inayatullah Zakaria, Ahmad
author_facet	Sohaimi, Norhanna Abdullah, Nazifah Shah, Sayed Inayatullah Zakaria, Ahmad
author_sort	Sohaimi, Norhanna
title	Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera
title_short	Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera
title_full	Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera
title_fullStr	Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera
title_full_unstemmed	Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera
title_sort	effects of fe as a physical filter on spectra of technitium-99m, uniformity, system volume sensitivity and spatial resolution of philip adac forte dual-head gamma camera
publisher	Institute of Physics Publishing (UK)
publishDate	2014
url	http://irep.iium.edu.my/39997/ http://irep.iium.edu.my/39997/ http://irep.iium.edu.my/39997/ http://irep.iium.edu.my/39997/1/Effect_of_Fe_as_a_physical_filter....pdf http://irep.iium.edu.my/39997/3/39997_Effects%20of%20Fe%20as%20a%20physical%20filter%20on%20spectra_SCOPUS.pdf
first_indexed	2023-09-18T20:57:24Z
last_indexed	2023-09-18T20:57:24Z
_version_	1777410396619014144

Effects of Fe as a physical filter on spectra of Technitium-99m, uniformity, system volume sensitivity and spatial resolution of Philip ADAC Forte dual-head gamma camera

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