They are usually performed in outpatient laboratories devoted to the specific test. Specialists like cardiologists or neurologists interpret the tests. Radiologists perform and interpret most of these tests. This is the simplest of the imaging techniques. There is no patient preparation required.
Results are usually available on the day of the test.
Patients may receive the dye by mouth, by the rectum, or have it injected into an artery or vein. There is usually some preparation of the bowels required. This is not an x-ray. This test is just like radar. Sound waves are passed through the body.