Henry Ka-Fung Mak

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BACKGROUND Visual hallucinations (VH) are one of the most striking nonmotor symptoms in Parkinson's disease (PD), and predict dementia and mortality. Aberrant default mode network (DMN) is associated with other psychoses. Here, we tested the hypothesis that DMN dysfunction contributes to VH in PD. METHODS Resting state functional data was acquired from(More)
Visual hallucinations carry poor prognosis in Parkinson’s disease. Here we tested the hypothesis that the hippocampus and visuospatial memory impairment play a central role in the pathology of PD with visual hallucinations. Multimodal magnetic resonance imaging of the brain was carried out in 12 people with PD and visual hallucinations; 15 PD individuals(More)
PURPOSE To assess any correlation of volume transfer constant (Ktrans) with apparent diffusion coefficient (ADC) in different brain tumor types at 3 T magnetic resonance (MR) imaging. MATERIALS AND METHODS Thirteen patients with brain tumors (8 men, 5 women; mean age 54.6±17.7 years) were enrolled in this retrospective study. All patients underwent(More)
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