Fluoroscopy uses a continuous beam of X-rays to evaluate structures and movement within the body. It can be used to help a health professional locate a foreign object in the body, position a catheter or needle for a procedure, or realign a broken bone.
Magnetic resonance imaging (MRI) is a test that uses a magnetic field and pulses of radio wave energy to provide pictures of organs and structures inside the body. In many cases, MRI provides information that cannot be obtained from an X-ray, ultrasound, or CT scan. The main contrast medium for MRI is Gadolinium.
Myelography is an X-ray study of the spinal canal. A dye (contrast material) that contains iodine is injected into the fluid-filled space (called the subarachnoid space) that surrounds the spinal cord and nerve roots; this makes them visible on X-ray pictures. X-ray (or CT) pictures are taken as the contrast material moves into different areas of the subarachnoid space.
Positron emission tomography (or PET scan) is a test that combines computed tomography (CT) and nuclear scanning. During a PET scan, a radioactive substance called a tracer is combined with a chemical substance and either inhaled or injected into a vein. The tracer emits tiny, positively charged particles (called positrons) that produce signals. A special camera records the tracer's signals as it travels through the body and collects in organs. A computer then converts the signals into three-dimensional images of the examined organ. PET scans provide information about an organ's function (metabolism).
X-rays are a form of radiation, like light or radio waves, that can pass through many objects,waves that can pass through many objects including the human body. When X-rays strike a piece of photographic film, they produce a picture. This can be used to create a pictures of the body structures such as the bones, organs, muscles and blood vessels. The denser the material, such as bone, the clearer the picture is.