Define and describe the creation of each of the following image types: X-Ray, MRI, CT (CAT) Scans, PET Scans, Ultrasound.

Ultrasound

High-frequency sound waves. Ultra-sound waves can be bounced off tissues by using special devices. The echoes are then converted into a picture called a sonogram. Ultrasound imaging allows an inside view of soft tissues and body cavities without the use of invasive techniques. Ultrasound is often used to examine a fetus during pregnancy. There is no evidence that any danger occurs from ultrasound during pregnancy.

Positron Emission Tomography (PET):

A positron emission tomography (PET) scan is an imaging test that helps reveal how your tissues and organs are functioning. A PET scan uses a radioactive drug (tracer) to show this activity. This scan can sometimes detect disease before it shows up on other imaging tests.

Magnetic Resonance Imaging (MRI):

A procedure that uses magnetism, radio waves, and a computer to create pictures of areas inside the body.

Computed Tomography (CT)/ CAT

CT, or CAT scans, are special X-ray tests that produce cross-sectional images of the body using X-rays and a computer. CT scans are also referred to as computerized axial tomography.

X-ray

an electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials opaque to light.