Comparison of Reconstructive Methods Using Different Filters to Study Cardiac Wall Motions in Gated Single Photon Emission Computerized Tomography Publisher



Shahbazigahrouei D¹ ; Arabpour A¹ ; Rastgoo F² ; Yaghoobi N² Show Affiliations
Source: Journal of Applied Sciences Published:2009

Abstract

The aim of study is to comparison of two reconstructive methods using different filters to study the five cardiac wall motions via Gated single photon emission computerized tomography imaging was done through Gated SPECT (with a two-day protocol) and quantitative coronary angiography (QCA) on 25 patients (16 males, 9 females, mean ages, 54.08 year). Angiography was performed on patients about 1 to 5 days before scanning. Regional wall motion was determined through two methods: using Gated SPECT, FBP and OSEM reconstructive methods and changes in frequency and spectrum slope in Metz, Butterworth and Ramp, it creates 42 sets. Motion disorders were classified in four groups. This data was compared and evaluated to data which was gained from QCA method in which motion disorders were classified in to four groups, too. The result reveals that in order to study function of each WM, the accurate and precise method is as follows (r = 0.7): For antero-basal wall OSEM reconstructive method with Ramp 2-8 filter and FBP reconstructive method with Metz 5-9 and Butterworth 0.35-9 filters is an accurate method. Applying OSEM with Ramp 4-8 filter and FBP with Metz 4.5-9 and Butterworth 0.35-9 filters for postero-basal wall is a suit method. OSEM with Ramp 2-8 filter and FBP with Metz 4-9 and Butterworth 0.30-9 filters for antero-lateral is a sufficient method. For apex wall, OSEM with Ramp 4-8 filter and FBP with Metz 4.5-9 and Butterworth 0.35-3 filters is a reliable method. Finally, applying OSEM with Ramp 2-8 filter and FBP with Metz 4.5-9 and Butterworth 0.35-9 filters for diaphragmatic wall is an accurate method. Electrocardiographic Gated single photon emission computed tomography (EGS) supplies worthwhile functional data to cardiologists. Exercising two physical factors of reconstructive methods and filtration in Gated SPECT, significant information can be obtained about cardiac wall motions. It suggests using an appropriate reconstructive method and filtration for studying cardiac wall motions by non-invasive and economical Gated SPECT method supplies maximum results. © 2009 Asian Network for Scientific Information.