Final answer:
MRI is a better test than CT scan in certain instances as it provides highly detailed images with none of the hazards of x-rays.
Step-by-step explanation:
An MRI (magnetic resonance imaging) is a better test than a CT scan in certain instances. MRI images are superior to x-rays for certain types of tissue and have none of the hazards of x-rays. They can provide highly detailed two- and three-dimensional images by broadcasting radio waves and measuring the density of nuclei in the body. Although MRI is less effective than x-rays in detecting breaks in bone and in imaging breast tissue, it is more commonly used when it can supply information that cannot be readily obtained from x-rays.