Chest Pain High BP. Go for angiography?

Greeting, My mother in law had chest pain on 31st July and had kept under observation. Necessary test has been done like ECG and 2D Echography.. On first ECG report slight variation was there and next day its was normal. Also 2D Echography report shows normal. Since there is weakness, also first ECG report shows slight variation Dr. recommend to go for CT Coronary Angiography. My question is do i need to go for Angiography? Also is angiography test common in all hospitals. Since we stay in Chembur Dr. recommend to do it from near by but we prefer from Breach Candy or Hinduja or Reliance for CT Angiography. If we have to go for CT Angiography test which is best Hospital to go for with latest technology amd how much does will it be cost. Your feedback ia highly appreciated. Regards. NK