Analysis of gated SPECT myocardial perfusion imaging using dynamic heart phantoms
In this paper we present results of dynamic heart phantoms images obtained with a gated-SPECT system, following the myocardial perfusion acquisition protocol with 99mTc. Two models of phantoms were used: one with symmetry of revolution around the long cardiac axis and another with anatomical shape. Both dynamic phantoms reproduce with realism cycles of distension-contraction and the change of ventricular volume, achieved with a mechatronic system. Characterization of phantoms in the laboratory and validation with SPECT are presented. The obtained tomography images were analyzed using different reconstruction methods and processing and quantification software. Results show, for the two types of phantoms, that the used analysis programs underestimate the volume of the ventricular cavity and overestimate the ejection fraction.