Idiopathic normal pressure hydrocephalus MRI
see Evans index
see Callosal angle
see DESH
NPH is characterized by an ongoing periventricular neuronal dysfunction seen on MRI as periventricular hyperintensity (PVH). Clinical improvement after shunt surgery is associated with CSF changes indicating a restitution of axonal function. Other biochemical effects of shunting may include increased monoaminergic and peptidergic neurotransmission, breakdown of blood brain barrier function, and gliosis 1).
An MRI-based diagnostic scheme used in a multicenter prospective study (Study of Idiopathic Normal Pressure Hydrocephalus on Neurological Improvement [SINPHONI]) appears to suggest that features of disproportionately enlarged subarachnoid-space hydrocephalus (DESH) are meaningful in the evaluation of NPH 2).
Phase contrast magnetic resonance imaging
see Phase contrast magnetic resonance imaging for idiopathic normal pressure hydrocephalus.
Diffusion-weighted imaging
Diffusion-weighted magnetic resonance imaging (DWI) 3) is used generally in the diagnosis and treatment of various neurodegenerative diseases. The apparent diffusion coefficient (ADC) of the brain, calculated from DWI data, is overestimated because of the effect of bulk motion (rigid body motion caused by the brain pulsation).
Arterial spin labelled imaging
see Arterial spin labelled imaging for idiopathic normal pressure hydrocephalus.
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