Investigation of the influence of scatter correction on apical lesion in myocardial perfusion SPECT studies
SPECT ("single photon emission computed tomography") is a widely used nuclear imaging technique. During SPECT imaging a radiolabeled substance emitting gamma photons is injected into the body that is distributed in the investigated organ. The main goal is to reconstruct the real activity distribution in the body in order to gain diagnostic information. The emitted gamma photons interact with the surrounding material resulting in distorted projection images.
The dominant physical effect in the energy range of the used tracers is Compton-scattering. In order to get rid of image distortion effect caused by Compton-scattering appropriate method should be applied. Such a method is the dual photopeak window method. The goal of this project laboratory work is to implement and verify the dual photopeak method for SPECT imaging. We try some phantom experiment, 15, 20, 25, 30 percent with energy windows. Examined the results of improvement can be seen in the pictures.
By using a program called XP Interview analyzed the achievements of Bullet 15% and 20% energy window and the phantom Ncat 15% energy window. Finally, we examined the impact of scatter correction algorithm of the heart wall.