X-rays, CT scans, and MRIs: these are imaging tests which can help doctors to diagnose medical issues, and also to aid minimally invasive procedures. But how many of us understand how imaging tests work and whether there are any risks to the patient? We find out more from radiologist Assoc Prof Dr Raja Rizal Azman Raja Aman and interventional radiologist Prof Dr Anushya Vijayananthan, from University Malaya Specialist Centre.