Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT

Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT

One of the limitations of single photon emission computed tomography (SPECT) is the presence of signals of noise in image data which degrade image quality. There are different sources of noise and one of them is the detection of scattered gamma photons in the SPECT projection data. Therefore, Zinc (...

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Bibliographic Details
Main Authors: Sayed, Inayatullah Shah, Ramli, Rose Amini
Format: Conference or Workshop Item
Language:English
English
Published: IEEE Explore 2018
Subjects:
QC Physics
Online Access:http://irep.iium.edu.my/62801/
http://irep.iium.edu.my/62801/
http://irep.iium.edu.my/62801/
http://irep.iium.edu.my/62801/7/62801%20Image%20Quality%20Enhancement%20by%20Reducing%20Scattered%20Gamma.pdf
http://irep.iium.edu.my/62801/13/62801_Image%20quality%20enhancement%20_SCOPUS.pdf
id iium-62801
recordtype eprints
spelling iium-628012019-02-15T02:57:28Z http://irep.iium.edu.my/62801/ Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT Sayed, Inayatullah Shah Ramli, Rose Amini QC Physics One of the limitations of single photon emission computed tomography (SPECT) is the presence of signals of noise in image data which degrade image quality. There are different sources of noise and one of them is the detection of scattered gamma photons in the SPECT projection data. Therefore, Zinc (Zn) material filter of 0.35mm thickness was used to preferentially absorb scattered gamma photons from reaching the detector of gamma camera. SPECT data were acquired by using Phillips ADAC Forte dual head gamma camera with and without material filter. Standard energy window (20%) centered at 140 keV over the photopeak of Tc-99m was adjusted. For data acquisition 128×128 matrix was selected. The Tc-99m radioactivity of 22.5 mCi was injected into the Carlson’s phantom. An insert placed into the phantom consisting of various sizes of hot regions was scanned. Material filter was installed on the outer surface of the collimator of gamma camera. Images were reconstructed by using filtered back projection method. Butterworth filter of cut-off frequency 0.35 cycle/cm and order 5 was chosen. Chang’s attenuation correction on the data was applied. Hot region images were analyzed in terms of contour/visual, hot regions detectability, contrast and signal-to-noise ratio (SNR). Results of our work show enhancement in the detectability and contrast of smaller hot regions with material filter. Increase in SNR of both large and small size hot regions with material filter as compared to without material filter. It is concluded that, material filter technique can assist clinicians in making correct decisions in detecting smaller hot lesions in Tc-99m clinical SPECT. However, more studies are required to validate its utility by scanning organ phantoms. Index Terms – Scatter Correction, SPECT, Material Filter, Image Quality. IEEE Explore 2018-02 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/62801/7/62801%20Image%20Quality%20Enhancement%20by%20Reducing%20Scattered%20Gamma.pdf application/pdf en http://irep.iium.edu.my/62801/13/62801_Image%20quality%20enhancement%20_SCOPUS.pdf Sayed, Inayatullah Shah and Ramli, Rose Amini (2018) Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT. In: 4th IEEE International Conference on Engineering Technologies and Applied Sciences (ICETAS), 29 November-1 December 2017, Salmabad, Bahrain. http://ieeexplore.ieee.org/abstract/document/8277903/ 10.1109/ICETAS.2017.8277903
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
Sayed, Inayatullah Shah
Ramli, Rose Amini
Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT
description One of the limitations of single photon emission computed tomography (SPECT) is the presence of signals of noise in image data which degrade image quality. There are different sources of noise and one of them is the detection of scattered gamma photons in the SPECT projection data. Therefore, Zinc (Zn) material filter of 0.35mm thickness was used to preferentially absorb scattered gamma photons from reaching the detector of gamma camera. SPECT data were acquired by using Phillips ADAC Forte dual head gamma camera with and without material filter. Standard energy window (20%) centered at 140 keV over the photopeak of Tc-99m was adjusted. For data acquisition 128×128 matrix was selected. The Tc-99m radioactivity of 22.5 mCi was injected into the Carlson’s phantom. An insert placed into the phantom consisting of various sizes of hot regions was scanned. Material filter was installed on the outer surface of the collimator of gamma camera. Images were reconstructed by using filtered back projection method. Butterworth filter of cut-off frequency 0.35 cycle/cm and order 5 was chosen. Chang’s attenuation correction on the data was applied. Hot region images were analyzed in terms of contour/visual, hot regions detectability, contrast and signal-to-noise ratio (SNR). Results of our work show enhancement in the detectability and contrast of smaller hot regions with material filter. Increase in SNR of both large and small size hot regions with material filter as compared to without material filter. It is concluded that, material filter technique can assist clinicians in making correct decisions in detecting smaller hot lesions in Tc-99m clinical SPECT. However, more studies are required to validate its utility by scanning organ phantoms. Index Terms – Scatter Correction, SPECT, Material Filter, Image Quality.
format Conference or Workshop Item
author Sayed, Inayatullah Shah
Ramli, Rose Amini
author_facet Sayed, Inayatullah Shah
Ramli, Rose Amini
author_sort Sayed, Inayatullah Shah
title Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT
title_short Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT
title_full Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT
title_fullStr Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT
title_full_unstemmed Image quality enhancement by reducing scattered gamma photons with a flat sheet of Zinc 0.35 mm thick material filter in Tc-99m SPECT
title_sort image quality enhancement by reducing scattered gamma photons with a flat sheet of zinc 0.35 mm thick material filter in tc-99m spect
publisher IEEE Explore
publishDate 2018
url http://irep.iium.edu.my/62801/
http://irep.iium.edu.my/62801/
http://irep.iium.edu.my/62801/
http://irep.iium.edu.my/62801/7/62801%20Image%20Quality%20Enhancement%20by%20Reducing%20Scattered%20Gamma.pdf
http://irep.iium.edu.my/62801/13/62801_Image%20quality%20enhancement%20_SCOPUS.pdf
first_indexed 2023-09-18T21:28:59Z
last_indexed 2023-09-18T21:28:59Z
_version_ 1777412383154634752

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