The CT scan is more inclusive than a cath as it views the anatomy
of the vessel, respiratory, aorta, etc. as well as
the lumen...
the cath only views
the lumen unless there is ultra sound attached to the probe.
An echocardiogram would not show any ischemia...echo establishes dimensions of the heart walls and chambers, blood flow, and wall movement impairment if any. The prior echo showed some wall movement impairment ( if serious EF would lower tnan normal...