Fabrication Of Phantom For Quality Assurance Assessment In Cardiac Spect Imaging
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Date
2018-04
Authors
Mustafa Sayah, Mohannad Adel
Journal Title
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Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Single-photon emission computed tomography (SPECT) is commonly used in nuclear imaging to detect myocardial infarction (MI) within a myocardial wall (MW). SPECT can identify areas of infarction in MW. In this work, a MI phantom was fabricated and designed to simulate the MW of the left ventricle (MWLV) in the end-diastole and end-systole stages. This work aimed to assess the MI phantom in both stages as a part of quality assurance assessment in cardiac SPECT imaging. In the end-diastole stage, when the defects were fixed at the anterior and inferior walls, the minimum detectable thickness was 2 mm regardless of the position of the phantom on the imaging table. When the defects were placed in the mid-region, the clarity of the defects could be observed at a minimum thickness of 3 mm. When defects were placed in the apex and basal regions, the clarity of the defects was only visible when the defects possessed a minimum thickness of 4 mm. In the end-systole stage, the minimum detectable thicknesses were 3 and 2 mm when the defects were placed at the anterior and inferior regions, respectively, regardless of the phantom position on the imaging table. The minimum detectable thickness of defects fixed in the septal and lateral regions was affected by the position of the phantom on the imaging table. When the phantom was moved from the centre to 15 cm away from the centre, the clarities were observed only in defects with a minimum thickness of 4 mm regardless of the regions, that is, mid, apex or basal. The Magnification percentage of defect area is at 94% to 106% at end diastole stage, and is at 98% to 110% at end systole stage, when the MI phantom was moved away from centre to off-centre of the imaging table. The positions of the MI phantom at the centre and energy window width (15%) were necessary to produce SPECT images with the highest contrast value at 0.31. Energy window (20% and 25%) with off-centre positioning produced SPECT images with low contrast value at 0.25, particularly when defects were located in the inferior region.
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Keywords
Fabrication of phantom for quality assurance , assessment in cardiac spect imaging