CT scans also detect calcium well.
MRI scan is better for soft tissues, including
tumors. However, CT scans done in combination with intravenous dye (give through a vein), a CT scan with contrast, will often show an abnormality such as a tumor. A CT scan, combined with a good neurologic physical examination by a neurologist, should be able to suggest or exclude whether or not there is an abnormality such as a tumor, because most tumors as associated with other neurologic signs on examination.