title: [Phase-weighted imaging in differentiating multiple system atrophy from idiopathic Parkinson disease].
abstract: OBJECTIVE
  To assess the efficacy of phase-weighted imaging in differentiating multiple system atrophy (MSA) from idiopathic Parkinson disease (IPD).
  
  
  METHODS
  A phase-weighted sequence was performed covering striatum in 21 patients with MSA, 20 patients with IPD, and 26 age-matched healthy volunteers after conventional brain magnetic resonance imaging examination on a 3.0T magnetic resonance imaging system. An experienced neuroradiologist who were blind to the clinical diagnosis applied region of interest (ROI) on post-processing phase images to measure the phase shift value of bilateral globus pallidus, putamen, and caudate head.
  
  
  RESULTS
  The phase shift values at bilateral putamen of MSA group were significantly lower than those of IPD group and control group (P < 0.05), while phase shift values at other locations of MSA group were not statistically different from those of other groups. The phase shift values showed no statistical difference between IPD group and control group at all regions.
  
  
  CONCLUSIONS
  Quantitative phase-weighted imaging is a useful sequence to reflect the abnormal iron accumulation in brains of patients with movement disorders and is helpful in the differential diagnosis between MSA and IPD.
authors.affiliation: Department of Radiology, PUMC Hospital, CAMS and PUMC, Beijing 100730, China. ffeng@pumch.cn
authors.forename: Feng
authors.initials: F
authors.lastname: Feng
authors.forename: Hui
authors.initials: H
authors.lastname: You
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.forename: Fu-Ling
authors.initials: FL
authors.lastname: Zheng
authors.forename: Zheng-Yu
authors.initials: ZY
authors.lastname: Jin
authors.forename: Li-Ying
authors.initials: LY
authors.lastname: Cui
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002421:Caudate Nucleus / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D005917:Globus Pallidus / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019578:Multiple System Atrophy / Q000175:diagnosis*; D010300:Parkinson Disease / Q000175:diagnosis*; D011699:Putamen / Q000473:pathology*