An angiograph of vessels can be done with a cathode or CT scan. There shouldn't be any fear to have a cath angioplasty. There is medication that will reduce any and all anxiety...the patient experiences nothing of any concern and almost always recovers within a day or so with no side effects. With cath, the cardiologist can do a stent implant during the procedure. With a CT scan, there is a possibility of stent implant cath procedure subsequently.
If your wife has symptoms that can't be managed with medication, then the cath procedure would be appropriate.
Thanks for sharing, and if you have any further questions you are welcome to post. Take care.