Phantom Study: Area and Clarity of Myocardial Wall Non-per Fused Defect Acquired using SPECT
Keywords:Clarity. Defect area. Myocardial wall. Positioning. SPECT
Physicianâ€™s interpretation worked continuously to improve nuclear image to be of perfect quality. Single photon emission computed tomography (SPECT) is one of the most important methods to assess the diagnosis of diseases. Myocardial perfusion imaging (MPI) studies consider the accuracy of defect area is most important to estimate precisely the severity of the infraction. The defect area inside myocardial wall defined as the coldest spot in SPECT images where the blood does not per-fused through this spot. In our study we used fabricated phantom from polyethylene plastic consist of two chambers to simulate myocardial wall of the left ventricle in end-diastole and end-systole. 4 plastic defects in same thickness were inserted at 4 regions inside myocardial phantom. Clarity of the defect of acquired SPECT images is defined by thickness. Our work was carried out to measure the defect area of SPECT myocardial image with depending on the positioning of phantom on an imaging table. The results showed that clarity of defect of acquired SPECT depends on location of the defect related to myocardial thickness (end-diastole, end-systole), and on positioning of the phantom. The measured area of the defect in acquired SPECT image was compared with true defect area. The measured defect area in SPECT images in comparison with true defect area has varied results depending on the thickness of myocardial phantom(end-diastole , end-systole), and on the positioning of the phantom as follows: underestimated 6% and 4% at the center for end-diastole and end-systole respectively, and overestimation 2%, 5%, 9% and 1%, 3%, 6%Â at off-center Â for end-diastole and end-systole respectivel that when the myocardial phantom positioned at 5 cm, 10 cm, and 15 cm on an imaging table.
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