PET Scan is the latest non-invasive investigation to ascertain coronary artery disease progress or the reversal of blockages. Dr. Dean Ornish used this investigation to show that reversal in the blockages of the coronary arteries of his patients had occurred. This extremely expensive and sophisticated investigation is available in a few centres only of the world. The patient is made to lie down on a table which is introduced into the scanner and sectional pictures are taken of the heart. A coloured graphical representation of the blood flow throughout the heart can also be obtained giving an accurate idea of the blockages present. The PET Scan Machine costs around Rs.XX crores and is not as yet available in our country.