title: Non-contrast-enhanced MR angiography of the thoracic aorta using cardiac and navigator-gated magnetization-prepared three-dimensional steady-state free precession.
abstract: OBJECTIVE
  To assess the usefulness of non-contrast-enhanced MR angiography using cardiac and navigator-gated magnetization-prepared three-dimensional (3D) steady-state free precession (SSFP) imaging for the diagnosis of diseases of the thoracic aorta.
  
  
  METHODS
  Twenty-two patients with diseases of the thoracic aorta were examined using a 1.5 Tesla unit. Non-contrast-enhanced MR angiography was done using parasagittal 3D SSFP combined with cardiac-gating and k-space weighted navigator-gating techniques, using T2-prepared and fat-suppression pulses. Imaging quality and the diagnostic capability of this technique were compared with the imaging quality of 2D SSFP or contrast-enhanced 3D MR angiography and with final diagnoses.
  
  
  RESULTS
  Non-contrast-enhanced 3D MR angiography provided signal-to-noise and contrast-to-noise ratios of the thoracic aorta comparable to non-contrast-enhanced 2D or contrast-enhanced 3D MR angiography (P > 0.17). This imaging technique gave accurate diagnoses in 19 of the 22 patients.
  
  
  CONCLUSIONS
  Non-contrast-enhanced MR angiography using cardiac and navigator-gated magnetization-prepared 3D SSFP technique was useful for the diagnosis of diseases of the thoracic aorta.
authors.affiliation: Department of Radiology, Nippon Medical School, Tokyo, Japan. yas-amano@nifty.com
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Amano
authors.forename: Katsuya
authors.initials: K
authors.lastname: Takahama
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Kumita
mesh_terms: D000293:Adolescent; D000328:Adult; D001013:Aorta, Thoracic / Q000473:pathology*; D001018:Aortic Diseases / Q000175:diagnosis; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged