The purpose of this study is to validate the use of DSPECT camera for the performance of quantitative spect ventricular function imaging by comparison to a validated procedure performed on standard nuclear cameras.

Inclusion Criteria:

• patients who have been referred by their physician to the nuclear medicine department for the quantitative SPECT ventricular function study
• voluntarily participate in the study

Exclusion Criteria:

• voluntarily to the study without being referred to the nuclear medicine department for the quantitative SPECT ventricular function study

patients who have been reffered by their physicians to the nuclear medicinew department for the preformance of quantitative SPECT venricular function study and will voluntarily participate in the study