<b> MRI Imaging </b>
is not a good choice for organs that move, like lungs and bowel, but very good for anything else.  MRI scans are often done pre-operatively, as a better idea of what is going on is obtained.   

Images of the soft-tissue structures of the body are clearer and more detailed than with other imaging methods.  The detail of MRI images makes MRI an invaluable tool in early diagnosis and evaluation of tumors.  MRI enables the detection of abnormalities that might be obscured by bone with other imaging methods.  MRI provides a fast, noninvasive alternative to x-ray angiography for diagnosing problems of the heart and cardiovascular system. MRI images can help physicians evaluate the function as well as the structure of many organs. MRI contrast material is less likely to produce an allergic reaction than the iodine-based materials used for conventional x-rays and CT scanning.    Exposure to radiation is avoided.  

However MRI examinations do take longer than the newer CT scanners, and some people do become too claustrophobic to complete the exam.

MRI scans are the scan of choice for bone, brain, cardiac lesions, and tumors of the extremity.  Its excellent resolution makes it either first or second choice in imaging any lesion, and it is often done pre-operatively for the best visual resolution of the tumor.  Not good for lung visualization, but excellent for tissues around the lungs.

CT scans and MRI scans are both used for the scanning of liver, spleen, kidneys, and possibly pancreas.  CT is better for lung and bowel.  MRI is better for pelvis, brain, bone, soft tissues, and extremities.  See the section below on Comparison of hepatic MRI and CT scans.

British researchers announced that they have combined CT scans and magnetic resonance imaging (MRI) to help better identify cancerous tumors.  

<b>MRIs</b>
&&url

<b>Comparison of MRI and CT scanners:
 British Medical Journal Article on Computed Tomography in Clinical Practice</b>
&&url


