title: MRA of intracranial aneurysms embolized with platinum coils: a vascular phantom study at 1.5T and 3T.
abstract: OBJECTIVE
  To analyze the influence of matrix and echo time (TE) of three-dimensional time-of-flight (3D TOF) magnetic resonance angiography (MRA) on the depiction of residual flow in aneurysms embolized with platinum coils at 1.5T and 3T.
  
  
  METHODS
  A simulated intracranial aneurysm of the vascular phantom was loosely packed to maintain the patency of some residual aneurysmal lumen with platinum coils and connected to an electromagnetic flow pump with pulsatile flow. MRAs were obtained altering the matrix and TE of 3D TOF sequences at 1.5T and 3T.
  
  
  RESULTS
  The increased spatial resolution and the shorter TE offered better image quality at 3T. For the depiction of an aneurysm remnant, the high-spatial-resolution 3T MRA (matrix size of 384 x 224 and 512 x 256) with a short TE of < or =3.3 msec were superior to the 1.5T MRA obtained with any sequences.
  
  
  CONCLUSIONS
  3T MRA is superior to 1.5T MRA for the assessment of aneurysms embolized with platinum coils; the combination of the 512 x 256 matrix and short TE (3.3 msec or less) seems feasible at 3T.
authors.affiliation: Department of Radiology, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Japan. kakeda@med.uoeh-u.ac.jp
authors.forename: Shingo
authors.initials: S
authors.lastname: Kakeda
authors.forename: Yukunori
authors.initials: Y
authors.lastname: Korogi
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Hiai
authors.forename: Toru
authors.initials: T
authors.lastname: Sato
authors.forename: Norihiro
authors.initials: N
authors.lastname: Ohnari
authors.forename: Junji
authors.initials: J
authors.lastname: Moriya
authors.forename: Koji
authors.initials: K
authors.lastname: Kamada
mesh_terms: D004621:Embolization, Therapeutic; D002532:Intracranial Aneurysm / Q000175:diagnosis* / Q000628:therapy*; D018810:Magnetic Resonance Angiography; D019047:Phantoms, Imaging; D010984:Platinum; D011673:Pulsatile Flow
chemical_list: D010984:Platinum