Low injection rate for 3D moving-table bolus-chase MR angiography: Initial experience with 3-T imaging to allay venous contamination in the calf

Kai Lin*, Zhao Qi Zhang, Jun Yan Sun, Zhan Ming Fan, Biao Lu

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

OBJECTIVE. The purpose of this study was to evaluate the potential for improving the image quality of 3D bolus-chase peripheral MR angiography by injecting contrast medium at a slow rate. SUBJECTS AND METHODS. Using similar imaging parameters in all cases, we performed bolus-chase MR angiography of the abdominal and lower limb arteries of 80 patients. The injection protocol for 40 patients had three parts: 20 mL of gadopentetate dimeglumine at 2 mL/s, 8 mL of gadopentetate dimeglumine at 1 mL/s, and 20 mL of saline solution at 1 mL/s. For the other 40 patients, the injection protocol was 20 mL of gadopentetate dimeglumine at 1.2 mL/s, 8 mL of gadopentetate dimeglumine at 0.7 mL/s, and 20 mL of saline solution at 0.7 mL/s. Using independent Student's t tests between groups, we compared signal-to-noise and contrast-to-noise ratios in the abdomen and pelvis, the thigh, and the calf. Arterial visibility and venous contamination on 3D images of the calf were graded and compared. RESULTS. The lower injection rate increased arterial visibility (p < 0.001), reduced venous contamination in the calf (p < 0.001), and increased the contrast-to-noise ratio in the calf (p < 0.001). At the upper levels, signal-to-noise and contrast-to-noise ratios did not differ between the two groups. CONCLUSION. At 3-T MRI, a lower injection rate may alleviate venous contamination and increase arterial visibility in the calf while signal-to-noise and contrast-to-noise ratios at higher levels are maintained.

Original languageEnglish (US)
Pages (from-to)1734-1739
Number of pages6
JournalAmerican Journal of Roentgenology
Volume191
Issue number6
DOIs
StatePublished - Dec 1 2008

Keywords

  • 3 T
  • Contrast medium
  • Injection protocol
  • MR angiography
  • Peripheral arterial occlusive disease

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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