Nonenhanced renal artery MR angiography with time spatial labeling inversion pulse technology and its clinical values.1Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China.
AbstractOBJECTIVE: 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）. CONCLUSION: 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. Sichuan Da Xue Xue Bao Yi Xue Ban. 2010 Sep;41（5）:881-4. PMID: 21302464 [PubMed - indexed for MEDLINE]
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