Characterization of Traumatic Brain Injury Using Imaging and Physiological Parameters: A Pilot Study

Area of Science:

• Neuroimaging
• Nuclear Medicine
• Traumatic Brain Injury

Background:

• Traumatic brain injuries (TBIs) are a concern for Operation Iraqi Freedom/Operation Enduring Freedom (OIF/OEF) veterans.
• Characterizing OIF/OEF TBIs requires advanced imaging and physiological assessment.

Purpose of the Study:

• To obtain preliminary data on OIF/OEF veterans with mild/moderate TBI.
• To characterize TBIs using perfusion and molecular imaging alongside physiological parameters.

Main Methods:

• Evaluated TBI lesion size and location in 6 veterans using Tc99m SPECT/CT and F18 PET/CT.
• Collected somatosensory evoked potentials and assessed quality of life, functional status, activities of daily living, and depression.

Main Results:

• Four of six subjects completed assessments; higher trauma severity correlated with lower independence.
• Perfusion and metabolic imaging detected abnormalities despite negative CT scans, often in the frontal lobe.
• More perfusion defects than metabolic defects were observed.

Conclusions:

• SPECT/CT and PET/CT show potential added value in diagnosing mild/moderate TBI.
• A larger study is needed to develop predictive TBI models incorporating neuroimaging and physiological data.
• Perfusion-metabolism mismatch may indicate compensatory mechanisms or impaired vasomotor response in TBI etiology.