The Collaborative International Dictionary of English v.0.48:

Angiogram \An"gi*o*gram\ ([a^]n"j[-e]*[-o]*gr[a^]m), n. (Med.)
   [angio- + Gr. gra`mma a writing.]
   An X-ray photograph produced by angiography. AS
   [PJC]

WordNet (r) 3.0 (2006):

angiogram
    n 1: an X-ray representation of blood vessels made after the
         injection of a radiopaque substance; "angiograms are
         produced by angiography"