Images are used in many applications for various purposes. Defect is an important issue in medical image we are analyze defect of medical images. The missing data in an image is computed through error detection mechanism. A defect is creating a major problem in the medical science. When a patient has disease then he takes doctor’s advises. Doctor checks patient and suggest to do checkup like X-RAY, MRI, CT-SCAN. Results of the patient’s test done by electronic machines and generates resulting images. In this paper we purpose a way to calculate actual percentage of defect in the patients resulted images from real/actual images so doctor Can find easily the dieses if the defects are very minor.