QC Phantoms

The Heart/Thorax Phantom is ideal for evaluation of detectability, extent  and  severity of myocardial infarcts in  patients.This Phantom also provides valid assessment of mammoscintigraphy techniques.The Striatal Phantom optimizes quantitative imaging in patients, using PET or SPECT.

Myocardial perfusion SPECT  is  a  widely-used, non-invasive method  for  the diagnosis and management of  patients with coronary disease. However, non-uniform photon  attenuation, Compton scatter, limited and depth-dependent spatial resolution, as well as image noise, limit the ability of SPECT to obtain images that  reliably represent the  true  tracer distribution. The  non- uniform attenuation of the thorax is the most significant factor limiting the diagnostic efficacy of myocardial SPECT.

The currently used attenuation, scatter and resolution correction methods are suboptimal, since they do not provide improvement in  the  25%  false-negative  findings in  a group of about  100 patients  with  luminal  diameter  stenoses of  at  least  50%. Furthermore, the ability to detect multivessel  disease was 70% without and 47% with corrections. This finding implies that myocardial SPECT can seriously underestimate the  extent of disease in high risk patients. On the other hand, the false-positive findings in the group with a low probability of coronary disease were reduced  from  14%  without corrections to  3%  with corrections.