title: Brain arteriovenous malformations: assessment with dynamic MR digital subtraction angiography.
abstract: OBJECTIVE
  Conventional catheter angiography (CCA) is the current reference standard for the diagnosis, assessment, and management of pial brain arteriovenous malformations (AVMs). The purpose of this study was to develop an MR angiographic technique that produces dynamic images comparable to those provided by CCA and to apply the technique to the investigation of pial brain AVMs.
  
  
  METHODS
  Twenty patients with brain AVMs referred for stereotactic radiosurgery were recruited. All patients had CCA performed on a 1.5-T superconducting system. Sixty images were obtained at a rate of one image per second. Slices were orientated to produce Towne, lateral, and anteroposterior projections. A set of mask images was taken and then a series during the passage of a bolus of contrast material. MR examinations were assessed independently by neuroradiologists blinded to the conventional catheter angiographic findings.
  
  
  RESULTS
  The nidus of the AVMs was depicted in 19 of the 20 patients, and correlation with CCA was excellent for measurements of maximum diameter. Venous drainage was correctly assessed in 18 of 19 cases.
  
  
  CONCLUSIONS
  MR digital subtraction angiography shows promise as a noninvasive, dynamic angiographic tool for planning stereotactic radiosurgery of AVMs already delineated by catheter angiography. At present, it suffers from temporal and spatial resolution, which impede the assessment of some brain AVMs.
authors: Academic Department of Radiology, University of Sheffield, MRI Department, Royal Hallamshire Hospital, South Yorkshire, UK.
authors: P D
authors: PD
authors: Griffiths
authors: N
authors: N
authors: Hoggard
authors: D J
authors: DJ
authors: Warren
authors: I D
authors: ID
authors: Wilkinson
authors: B
authors: B
authors: Anderson
authors: C A
authors: CA
authors: Romanowski
mesh_terms: D000293:Adolescent; D000328:Adult; D015901:Angiography, Digital Subtraction; D002533:Cerebral Angiography; D005260:Female; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000175:diagnosis* / Q000601:surgery; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D010347:Patient Care Planning; D016634:Radiosurgery; D012189:Retrospective Studies