title: Comparison of imaging modalities for the accurate delineation of arteriovenous malformation, with reference to stereotactic radiosurgery.
abstract: OBJECTIVE
  To investigate the discrepancy between the arteriovenous malformations seen on magnetic resonance angiography (MRA) and on stereotactic digital subtracted angiography (DSA).
  
  
  METHODS
  The target volume on stereotactic DSA (V(DSA)) and the target volume on MRA (V(MRA)) were separately delineated in 28 intracranial arteriovenous malformations. The coordinates of the center and the outer edges of V(DSA) and V(MRA) were calculated and used for the analyses.
  
  
  RESULTS
  The standard deviations (mean value) of the displacement of centers of V(MRA) from V(DSA) were 2.67 mm (-1.82 mm) in the left-right direction, 3.23 mm (-0.08 mm) in the anterior-posterior direction, and 2.16 mm (0.91 mm) in the craniocaudal direction. V(MRA) covered less than 80% of V(DSA) in any dimensions in 9 cases (32%), although no significant difference was seen in the target volume between each method, with a mean value of 11.9 cc for V(DSA) and 12.3 cc for V(MRA) (p = 0.948).
  
  
  CONCLUSIONS
  The shift of centers between each modality is not negligible. Considering no significant difference between V(DSA) and V(MRA), but inadequate coverage of the V(DSA) by V(MRA), it is reasonable to consider that the target on MRA might include the feeding artery and draining vein and possibly miss a portion of the nidus.
authors.affiliation: Department of Radiology, Hokkaido University Graduate School of Medicine, North-15 West-7, Sapporo, Japan. hao@radi.med.hokudai.ac.jp
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Aoyama
authors.forename: Hiroki
authors.initials: H
authors.lastname: Shirato
authors.forename: Norio
authors.initials: N
authors.lastname: Katoh
authors.forename: Kohsuke
authors.initials: K
authors.lastname: Kudo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Asano
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kuroda
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Kazuo
authors.initials: K
authors.lastname: Miyasaka
mesh_terms: D000293:Adolescent; D000328:Adult; D015901:Angiography, Digital Subtraction / Q000592:standards; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D002538:Intracranial Arteriovenous Malformations / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D016634:Radiosurgery