Abstract
Imaging modalities such as CT and magnetic resonance imaging (MRI) are powerful tools to detect and assess focal injury such as hemorrhagic lesions and edema and brain swelling in severe injury. However, acute and chronic injury at a cellular level is sometimes difficult to discern from normal features by anatomical imaging. Magnetic resonance spectroscopy (MRS) offers a unique noninvasive approach to assess injury at microscopic levels by quantifying cellular metabolites. The findings obtained with MRS in concussion and more severe head trauma are heterogeneous, reflecting the different time after injury, degree of injury and different physiologic and pathologic response of the brain to injury in individuals. The most important findings are that elevated lactate (and lipids) in apparently normal tissue observed 2–5 days after injury are indicators of severe global hypoxic injury and poor outcome. Also, N-acetylaspartate (NAA), a marker for “healthy” neurons and axons, is generally reduced in traumatic brain injury signaling neuronal and axonal loss/damage. The extent of NAA reduction after injury is an objective and quantitative surrogate marker for the severity of injury and is useful for outcome prediction. In the cases of mild traumatic brain injury, choline (Cho) has been shown to be reflective of diffuse axonal injury and alterations in neurotransmitters such as glutamate (Glu) and gamma amino butyric acid (GABA) have also been shown.
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Lin, A.P., Blüml, S. (2013). Traumatic Brain Injury and Concussion. In: Blüml, S., Panigrahy, A. (eds) MR Spectroscopy of Pediatric Brain Disorders. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-5864-8_7
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