Welcome to HCM,
Thanks for posting query to this forum
Your mother's TMT is positive for reversible myocardial Ischemia
, that is why she has been advised to go for CT angiography
CT angiography is non invasive investigation and once if there are blocks in coronary then regular catheter angiography is required.
Please discuss with your cardiologist and if blocks are strongly suspected then regular angiography would be logical as angioplasty
can be planned in same sitting.
If TMT is positive but blocks are not strongly suspected then non invasive CT angiography will be ordered as a negative CT angio will confirm no significant block are there and can be managed by medical treatment.
Hope this is useful to you.
Dr.Akhilesh Dubey M.D.