Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study

Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study

Approximate attenuation correction techniques are used to handle the effects of absorption of gamma photons in the patient’s body on image quality and quantification of radioactivity uptake. In this study, our aim is to evaluate the effects of Chang’s attenuation correction technique on cold and ho...

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Bibliographic Details
Main Authors: Sayed, Inayatullah Shah, Hassan, Aima Harfiza
Other Authors: Abu Osman, Noor Azuan
Format: Conference or Workshop Item
Language:English
Published: Springer Berlin Heidelberg 2011
Subjects:
QC Physics
Online Access:http://irep.iium.edu.my/5675/
http://irep.iium.edu.my/5675/
http://irep.iium.edu.my/5675/2/Evalauation_of_the_effects_of_Chang%27s_Attenuation.pdf
id iium-5675
recordtype eprints
spelling iium-56752011-11-25T06:28:17Z http://irep.iium.edu.my/5675/ Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study Sayed, Inayatullah Shah Hassan, Aima Harfiza QC Physics Approximate attenuation correction techniques are used to handle the effects of absorption of gamma photons in the patient’s body on image quality and quantification of radioactivity uptake. In this study, our aim is to evaluate the effects of Chang’s attenuation correction technique on cold and hot region images with various sizes and locations in the phantom having similar cross sectional views. Philip ADAC Forte dual head gamma camera is used. A novel phantom loaded with Tc-99m is scanned. Data acquisition parameters are chosen same as that in patient studies. Images are produced by filtered back projection technique. Chang’s attenuation correction is used with different linear attenuation coefficient (LAC) values. Cold and hot region images are analyzed in terms of regions detectability, contrast and standard deviation. Hot region images are also studied by relative count ratio. Results indicate that, cold region detectability is improved as compared to hot regions with all LAC values used here. No changes in the contrast of 22.4 mm diameter and decrease in 17.9 mm and 14.3 mm diameter cold region image are observed. Hot region image contrast of 13.4 mm diameter is enhanced, whereas, 22.4 mm and 17.9 mm diameter is equivocal with and without Chang’s technique.Relative count ratio of hot region images is improved. However, standard deviation in the count density of both types of regions is increased. Effects of Chang’s attenuation correction technique on cold and hot region images are different. Therefore, care must be taken in clinical studies. Springer Berlin Heidelberg Abu Osman, Noor Azuan Wan Abas, Wan Abu Bakar Abdul Wahab, Ahmad Khairi Ting, Hua-Nong 2011 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/5675/2/Evalauation_of_the_effects_of_Chang%27s_Attenuation.pdf Sayed, Inayatullah Shah and Hassan, Aima Harfiza (2011) Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study. In: 5th Kuala Lumpur International Conference on Biomedical Engineering, 20th - 23rd June 2011, Kuala Lumpur, Malaysia. http://www.springerlink.com/content/p21053173178l41k/
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
Sayed, Inayatullah Shah
Hassan, Aima Harfiza
Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study
description Approximate attenuation correction techniques are used to handle the effects of absorption of gamma photons in the patient’s body on image quality and quantification of radioactivity uptake. In this study, our aim is to evaluate the effects of Chang’s attenuation correction technique on cold and hot region images with various sizes and locations in the phantom having similar cross sectional views. Philip ADAC Forte dual head gamma camera is used. A novel phantom loaded with Tc-99m is scanned. Data acquisition parameters are chosen same as that in patient studies. Images are produced by filtered back projection technique. Chang’s attenuation correction is used with different linear attenuation coefficient (LAC) values. Cold and hot region images are analyzed in terms of regions detectability, contrast and standard deviation. Hot region images are also studied by relative count ratio. Results indicate that, cold region detectability is improved as compared to hot regions with all LAC values used here. No changes in the contrast of 22.4 mm diameter and decrease in 17.9 mm and 14.3 mm diameter cold region image are observed. Hot region image contrast of 13.4 mm diameter is enhanced, whereas, 22.4 mm and 17.9 mm diameter is equivocal with and without Chang’s technique.Relative count ratio of hot region images is improved. However, standard deviation in the count density of both types of regions is increased. Effects of Chang’s attenuation correction technique on cold and hot region images are different. Therefore, care must be taken in clinical studies.
author2 Abu Osman, Noor Azuan
author_facet Abu Osman, Noor Azuan
Sayed, Inayatullah Shah
Hassan, Aima Harfiza
format Conference or Workshop Item
author Sayed, Inayatullah Shah
Hassan, Aima Harfiza
author_sort Sayed, Inayatullah Shah
title Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study
title_short Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study
title_full Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study
title_fullStr Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study
title_full_unstemmed Evaluation of the effects of Chang’s attenuation correction technique on similar transverse views of cold and hot regions in Tc-99m SPECT: a phantom study
title_sort evaluation of the effects of chang’s attenuation correction technique on similar transverse views of cold and hot regions in tc-99m spect: a phantom study
publisher Springer Berlin Heidelberg
publishDate 2011
url http://irep.iium.edu.my/5675/
http://irep.iium.edu.my/5675/
http://irep.iium.edu.my/5675/2/Evalauation_of_the_effects_of_Chang%27s_Attenuation.pdf
first_indexed 2023-09-18T20:14:24Z
last_indexed 2023-09-18T20:14:24Z
_version_ 1777407690696294400

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