title: Quality-evaluation scheme for cerebral time-resolved 3D contrast-enhanced MR angiography techniques.
abstract: OBJECTIVE
  No practical tool has been reported in the literature to evaluate the quality of cerebral TR-3D-CE-MRA techniques. Our study assessed a large list of parameters used to propose a quality-evaluation scheme for TR-3D-CE-MRA.
  
  
  METHODS
  A large list of visual and quantitative parameters used to study the quality of images was collected from the literature and evaluated in 19 healthy patients and 11 patients with arteriovenous shunts who had undergone both CENTRA keyhole TR-3D-CE-MRA at 3T and CCA. Several observers evaluated the visual parameters, such as the diagnostic confidence index, artifacts, maximum vascular signal intensity, arterial-to-venous separation, and visibility of 17 arteries and 7 veins; and quantitative parameters, such as maximum arterial SI, arteriovenous transit time, arteriovenous contrast curve, and ADW. A statistical analysis was used to determine interobserver reproducibility of the visual parameters, to calculate the sensitivity of TR-3D-CE-MRA for detecting each vessel (with CCA as standard of reference), and to compare the results of the visual and quantitative evaluations.
  
  
  RESULTS
  Diagnostic confidence index, artifacts, arterial-to-venous separation, and 4 vessels-the PICA, ophthalmic and occipital arteries, and the ISS-demonstrated high reproducibility and sensitivity. The ADW was the most reliable dynamic quantitative parameter and was correlated with arterial-to-venous separation.
  
  
  CONCLUSIONS
  The image quality of TR-3D-CE-MRA can be effectively evaluated with a scheme of 1 quantitative and 7 visual parameters.
authors.affiliation: Department of Neuroradiology, Pontchaillou University Hospital, Rennes, France.
authors.forename: H
authors.initials: H
authors.lastname: Raoult
authors.forename: J-C
authors.initials: JC
authors.lastname: Ferré
authors.forename: X
authors.initials: X
authors.lastname: Morandi
authors.forename: B
authors.initials: B
authors.lastname: Carsin-Nicol
authors.forename: M
authors.initials: M
authors.lastname: Carsin
authors.forename: M
authors.initials: M
authors.lastname: Cuggia
authors.forename: M
authors.initials: M
authors.lastname: Law
authors.forename: J-Y
authors.initials: JY
authors.lastname: Gauvrit
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016477:Artifacts; D002536:Cerebral Arteries / Q000033:anatomy & histology / Q000473:pathology; D002550:Cerebral Veins / Q000033:anatomy & histology / Q000473:pathology; D002561:Cerebrovascular Disorders / Q000473:pathology*; D002648:Child; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods* / Q000592:standards* / Q000706:statistics & numerical data; D018810:Magnetic Resonance Angiography / Q000379:methods* / Q000592:standards* / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D012016:Reference Values; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D055815:Young Adult
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