Imaging techniques are used to create images of structure, function and pathology of human body organs for cancer diagnosis. Various imaging techniques like X-ray, Ultra-Sonography (US), Positron Emission Tomography (PET), Ultrasound, MRI etc. are used for cancer diagnosis. These imaging techniques have gone through Lot of advancements during lost few years. These techniques vary in the technology and application. Various artifacts exist in these imaging techniques and images produced by theses imaging techniques. These artifacts can be exploited to enhance the imaging technique and the images produced by them.