radioscopy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Examination of the inner structure of optically opaque objects by x-rays or other penetrating radiation; radiology.

from The Century Dictionary.

• noun The detection, study, or application of X-rays, specifically by observations with a fluorescent screen.
• noun Examination of opaque objects by means of the X-rays or other form of radioactivity.

from the GNU version of the Collaborative International Dictionary of English.

• noun Direct observation of objects opaque to light by means of some other form of radiant energy, as x-rays.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun examination of objects by the use of X-rays; radiology

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation