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Department of Radiology, Department of Psychology, Mount Sinai Hospital, and University of Toronto
Department of Rehabilitation Medicine, West Park Hospital, Toronto, Canada
Correspondence: For correspondence or reprints contact: Masanori Ichise, MD, Room 635, Nuclear Medicine, Dept. of Radiology, Mount Sinai Hospital, 600 University Ave., Toronto, Ontario, Canada M5G 1X5.
ABSTRACT
The purposes of this study were: (1) to compare 99mTc-hexamethylpropyleneamineoxime (HMPAO) SPECT with CT and MRI in chronic traumatic brain injury (TBI) patients and (2) to correlate both functional and structural neuroimaging measurements of brain damage with neuropsychological (NP) performance. Methods: Twenty-nine patients (minor TBI, n = 15 and major TBI, n = 14) and 17 normal controls (NC) underwent HMPAO SPECT, CT, MRI and NP testing. Imaging data were analyzed both visually and quantitatively. Results: Nineteen (66%) patients showed 42 abnormalities on SPECT images, whereas 13 (45%) and 10 (34%) patients showed 29 abnormalities on MRI and 24 abnormalities on CT. SPECT detected relatively more abnormalities than CT or MRI in the minor TBI subgroup. The TBI group showed impairment on 11 tests for memory, attention and executive function. Of these, the anterior-posterior ratio (APR) correlated with six tests, whereas the ventricle-to-brain ratio (VBR), a known structural index of a poor NP outcome, correlated with only two tests. Conclusion: In evaluating chronic TBI patients, HMPAO SPECT, as a complement to CT or MRI, may play a useful role by demonstrating brain dysfunction in morphologically intact brain regions and providing objective evidence for some of the impaired NP performance.
Key Words: chronic traumatic brain injury • neuropsychological dysfunction • technetium-99m-HMPAO • computed tomography • magnetic resonance imaging • single photon emission computed tomography
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