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PURPOSE To examine the usefulness of diffusion kurtosis imaging for the diagnosis of Parkinson disease (PD). MATERIALS AND METHODS Examinations were performed with the understanding and written consent of each subject, with local ethics committee approval, and in compliance with national legislation and Declaration of Helsinki guidelines.(More)
A number of experiments in animals have shown that successful induction of plasticity can be abolished if an individually ineffective intervention is given shortly afterwards. Such effects are termed depotentiation/de-depression. These effects contrast with metaplasticity/homeostatic plasticity in which pretreatment of the system with one protocol modulates(More)
PURPOSE To determine whether progressive supranuclear palsy (PSP) is associated with specific diffusion tensor imaging (DTI) patterns of diffusivity, anisotropy, and coherence in functionally relevant brain areas. MATERIALS AND METHODS In all, 17 PSP patients and 17 controls were scanned using a 3 T magnetic resonance imaging (MRI) scanner. Patients were(More)
BACKGROUND Parkinson's disease (PD) is one of the most prevalent age-related neurodegenerative diseases and usually refers to a complex disorder with multiple genetic and environmental factors influencing disease risk. We here performed a gene-based case-control association study to scrutinize whether genetic variants in SNCA and LRRK2 genes could(More)
PURPOSE We employed imaginary tasks to investigate the neurophysiology of gait in patients with Parkinson's disease (PD) using functional magnetic resonance imaging (fMRI). METHODS Cortical activation of gait-related imagery was explored in 13 PD patients, 13 age-matched controls (Old), and 14 young volunteers (Young) using fMRI. The tasks included gait(More)
UNLABELLED PET with (18)F-9-fluoropropyl-(+)-dihydrotetrabenzazine ((18)F-DTBZ), a novel radiotracer targeting vesicular monoamine transporter type 2 (VMAT2), has been proven as a useful imaging marker to measure dopaminergic integrity. METHODS The aim of this study was to evaluate the capability of (18)F-DTBZ PET in detecting the monoaminergic(More)
IMPORTANCE Currently, diagnosis of Parkinson disease is mainly based on clinical criteria characterized by motor symptoms including bradykinesia, rigidity, resting tremor, and postural instability. Reliable in vivo biomarkers to monitor disease severity and reflect the underlying dopaminergic degeneration are important for future disease-modifying therapy(More)
UNLABELLED (18)F-9-fluoropropyl-(+)-dihydrotetrabenazine ((18)F-AV-133) is a novel positron emission tomography tracer for imaging the vesicular monoamine transporter II in dopaminergic neuron degeneration, which might be indicative for Parkinson's disease (PD) and other parkinsonism. Studies were performed to optimize the imaging time window for(More)
BACKGROUND Richardson's syndrome (RS) and progressive supranuclear palsy-parkinsonism (PSP-P) are the most common subtypes of PSP syndrome. The clinical features, responses to levodopa, and progression are relatively different but overlap. Determining whether combined molecular imaging studies of dopamine transporter and D2 receptor are helpful for further(More)
UNLABELLED (18)F-FP-(+)-DTBZ is a novel PET radiotracer targeting vesicular monoamine transporter type 2 (VMAT2). The goal was to explore the image features in normal human brains with (18)F-FP-(+)-DTBZ as a reference of molecular landmark for clinical diagnosis in Parkinson's disease (PD) and related disorders. MATERIALS AND METHODS A total of 22 healthy(More)