title: [Nonenhanced renal artery MR angiography with time spatial labeling inversion pulse technology and its clinical values].
abstract: OBJECTIVE
  To evaluate the feasibility of nonenhanced renal artery MR angiography (MRA) with respiratory-gated time spatial labeling inversion pulse (time-slip) and its clinical application.
  
  
  METHODS
  Thirty-two consecutive patients underwent the 1.5 T MRI (TOSHIBA EXCELART Vantage) examination to visualize renal artery with contrast-enhanced MRA (CEMRA) and the examination with time-slip technology. Signal to noise ratio (SNR) and contrast to noise ratio (CNR) were measured on CEMRA and Time-slip images, respectively. Two experienced radiologists assessed the imaging quality of renal artery MRA on 3D-MIPs reconstructed images.
  
  
  RESULTS
  Sixty-four renal arteries and 3 accessory renal arteries in 32 patients were visualized on both time-slip and CEMRA. SNR values on Time-slip and CEMRA were 102.7 +/- 16.2 and 83.9 +/- 17.7 (t = -4.625, P < 0.001); CNR were 97.8 +/- 16.1 and 78.8 +/- 18.3 (t = -4.554, P < 0.001), respectively. Time-slip MIP images obtained higher quality than CEMRA did (Z = -2.318, P = 0.02), and venous contamination was sharply reduced on Time-slip technology when compared with CEMRA (Z = -4.895, P = 0.001).
  
  
  CONCLUSIONS
  Non-enhanced renal artery MRA with respiratory-gated time-slip technology can provide higher SNR images of renal artery than conventional CEMRA, which can provide more information for clinical decision-making.
authors.affiliation: Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Chen
authors.forename: Chun-chao
authors.initials: CC
authors.lastname: Xia
authors.forename: Jia-yu
authors.initials: JY
authors.lastname: Sun
authors.forename: Chang-xian
authors.initials: CX
authors.lastname: Li
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yuan
authors.forename: He-han
authors.initials: HH
authors.lastname: Tang
authors.forename: Bin
authors.initials: B
authors.lastname: Song
authors.forename: Zhen-lin
authors.initials: ZL
authors.lastname: Li
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003287:Contrast Media; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012077:Renal Artery; D055425:Respiratory-Gated Imaging Techniques / Q000379:methods*; D055815:Young Adult
chemical_list: D003287:Contrast Media