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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/39997/1/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
http://irep.iium.edu.my/39997/
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spelling my.iium.irep.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 REM 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
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
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/39997/1/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
http://irep.iium.edu.my/39997/
http://iopscience.iop.org/
_version_ 1643611738651754496
score 13.211869

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