Influence of source-to-collimator distance on image quality in single photon emission computed tomography: a phantom study

Sayed, Inayatullah Shah and Yusup, Nur Amirah (2020) Influence of source-to-collimator distance on image quality in single photon emission computed tomography: a phantom study. International Journal of Allied Health Sciences, 4 (4). pp. 1683-1692. E-ISSN 2600-8491

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Abstract

Introduction: Source-to-collimator distance is one of the physical factors that can affect the quality of images generated in Single Photon Emission Computed Tomography (SPECT). Therefore, this work investigated the effect of source-to-collimator distance on image quality in terms of uniformity, hot and cold regions contrast and signal-to-noise ratio (SNR). Methods: SPECT data were acquired by scanning R.A. Carlson’s cylindrical phantom using Philips ADAC Forte dual head gamma camera with parallel- hole low energy high resolution (LEHR) collimator. Five different settings of collimator to phantom distance were applied which were 26, 27, 28, 29 and 30cm. Reconstruction of the images was done by using filtered back-projection (FBP) in conjunction with Butterworth filter with cut off frequency of 0.35 cycle/cm and order 5. The reconstructed images were evaluated quantitatively via standard deviation, contrast and SNR. Results: It was found from the quantitative analysis that the standard deviation in the counts of uniform regions increased whereas the contrast and SNR of most hot and cold regions decreased with the increase in phantom-to-collimator distance. Conclusion: The farther the object to be imaged from the gamma camera collimator results, the poorer image quality of the reconstructed image. Therefore, in SPECT clinical examinations attention on the source-to-collimator distance needs to be given in order to achieve the diagnostic quality images.

Item Type:	Article (Journal)
Additional Information:	6128/88722
Uncontrolled Keywords:	SPECT, Image quality, Source-to-Collimator distance, Spatial resolution
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Allied Health Sciences Kulliyyah of Allied Health Sciences > Department of Diagnostic Imaging and Radiotherapy
Depositing User:	Dr Inayatullah Shah Sayed
Date Deposited:	19 Mar 2021 11:01
Last Modified:	19 Mar 2021 11:01
URI:	http://irep.iium.edu.my/id/eprint/88722

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