Advances in medical technology have revolutionized diagnostic brain im
aging. Traditional radiography and invasive contrast studies for intra
cranial imaging have been superseded by several newer imaging modaliti
es which provide high resolution, cross-sectional images. Ultrasonogra
phy, computed tomography, magnetic resonance, and nuclear scintigraphy
are now used for anatomical and functional imaging of the brain. Thes
e noninvasive modalities are available at most veterinary teaching ins
titutions and are offered through many larger referral practices. The
diagnostic usefulness and clinical limitations fur each of these modal
ities are described.