'Outdated': Radiologists refute AIIMS director's remark on CT scans 'Outdated': Radiologists refute AIIMS director's remark on CT scans The Indian Radiological and Imaging Association has expressed shock and disappointment at the comments of the AIIMS, Delhi director Dr Randeep Guleria on CT scans. The theory that a CT scan is equivalent to 300-400 chest X-rays is ‘outdated’, the doctors' body said in a statement. advertisement (Photo for representation) The Radiology and Imaging Association of India has refuted claims made by the AIIMS director's that Computerised Tomography or CT scans are extremely harmful. This theory is ‘outdated’, the doctors' body said in a statement.