X-ray involves exposing the part of the body that is being examined to a small dose of ionizing radiation to produce pictures of the inside of the body.

CT Scan is a diagnostic imaging procedure that combines the use of x-rays with computer technology to produce cross-sectional images (“slices”) of the body.

Ultrasound uses high-frequency sound waves to view inside the body. There is no ionizing radiation exposure associated with ultrasound imaging.

An OPG is a wide x-ray  view of all the teeth of the upper and lower jaw on a single film.  It demonstrates the number, position and growth of all the teeth.