Quantitative and Qualitative Evaluations of Defect Images in Different Regions of Myocardial Phantom under Implementation of Various Filters in SPECT

In myocardial perfusion single Photon Emission Computed Tomography (SPECT), images are degraded by photon attenuation, distance-dependent collimator, detector response. The filters in reconstruction process can greatly affect the quality of the SPECT images. The purpose of this study is to make quantitative and qualitative evaluation of the acquired SPECT images of similar defects which are located in the different regions of myocardial phantom under implementation of different filters. Herein, rectangular defects with the same thickness were inserted on the different regions of on the inner wall of the myocardial phantom. Myocardial perfusion study was performed with meta-stable Technetium with a dual head SPECT system. Raw data was reconstructed by filter back projection method with some filters. Then, results of implementation of various filters with different parameters on the contrast, signal to noise ratio and size of defects images in transverse, coronal and sagittal views of the phantom have been studied. The results show that contrast, signal to noise ratio and size of defects images are depending on the defect locations, type of filters and the selection of view which is examined for specified defect.