Swiss researchers are working on a hybrid cardiac imaging method that combines coronary CT angiography with SPECT myocardial perfusion imaging to predict relevant coronary lesions with considerably less radiation dose and scanning time: http://www.auntminnie.com/index.asp?Sec=sup&Sub=mol&Pag=dis&ItemId=86174&wf=3171

From Aunt Minnie: Cardiology groups revise guidelines for SPECT MPI
The American College of Cardiology Foundation collaborated with other specialty groups to update its SPECT MPI Appropriateness Criteria to include revisions in the uses of tests and clinical information and to better define the utilization of cardiac radionuclide imaging. The changes are anticipated to have a considerable effect on clinical practice.