The video will show how the nuclear study is done by Dr. Atul Verma, Head Dept. of Nuclear Medicine, Fortis Hospital, New Delhi. The radioactive substances are injected in patients and they travel towards the main organs. Generally isotopes are organ specific, for example in cardiac imaging, the prescribed radiotraces will reach the main muscle of the heart known as myocardium. It will emit the radiation and this radiation is being detected by a special form of instrument known as gamma camera or SPECT gamma camera.