Related Clues:

• Security measure
• Inside job?
• MRI forerunner
• Dental exam shot
• ER picture
• Look deeper inside?
• Inner vision?
• M.D.'s picture
• Source of inner clarity?
• Diagnostic pic
• It precedes Yankee in the phonetic alphabet
• MRI's kin
• Picture of bones, often
• With 13-Down, 'super power' glasses
• Surgeon's image