Skull X-ray

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Test Overview

A skull X-ray is a series of pictures of the bones of the skull. The nasal sinuses can also be viewed on a skull X-ray. Skull X-rays have largely been replaced by computed tomography (CT) scans.

X-rays are a form of radiation, like light or radio waves, that are focused into a beam, much like a flashlight beam. X-rays can pass through most objects, including the human body. X-rays make a picture by striking a detector that either exposes a film or sends the picture to a computer. Dense tissues in the body, such as bones, block (absorb) many of the X-rays and look white on an X-ray picture. Less dense tissues, such as muscles and organs, block fewer of the X-rays (more of the X-rays pass through) and look like shades of gray on an X-ray. X-rays that pass only through air look black.

A skull X-ray may help find head injuries, bone fractures, or abnormal growths or changes in bone structure or size.

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Last updated:	May 10, 2006
Author:	Jan Nissl, RN, BS
Reviewed By:	Paul D. Traughber, MD - Radiology, Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology
Editors:	Susan Van Houten, RN, BSN, MBA, Tracy Landauer

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