Survey on Causes and Reduction of Metal Artifact in Medical Images

The diagnostic values of the scanned images are degraded by the presence of metallic implants. These metallic implants are placed inside the human body due to the growth in demand for minimally invasive surgical procedures, the increasing number of road accidents & trauma cases,obese populations and the growing incidence of lifestyle disorders. These metal implants increases the cause for metal artifacts.Removal of these metal artifacts without compromising the image quality is still a challenging task for better diagnosis.In this paper, survey on different causes for these metal artifacts and reduction mechanisms followed for different scanning mechanisms like CT,MRI,PET., with different metal implants are discussed. It is observed that different MAR algorithms helps to reduce the effects caused by the presence of metal implants.Also image fusion techniques also helps to overcome the effects caused by metal artifacts in the reconstructed images.