What type of power injector is used in magnetic resonance mammography (breast MRI)?

Updated: Feb 25, 2019
  • Author: Preeti Gupta, MD, FRCR; Chief Editor: Eugene C Lin, MD  more...
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The administration of contrast material should be by means of a rapid bolus injection. The authors routinely use an MRI-compatible power injector at a rate of 2 mL/sec, followed by a 20-mL isotonic sodium chloride flush. Although they are less convenient, hand injections are also successful.

For 2D GRE sequences, a dose of 0.16 mmol/kg appears to provide better sensitivity for lesion detection than the standard dose of 0.1 mmol/kg at field strengths less than 1.0T. [40] However, good evidence suggests that with 3D gradient echo sequences at higher field strengths, the standard dose of 0.1 mmol/kg does not reduce the sensitivity of the test, [41] and the authors routinely use this dose successfully.

Injection timing is important for breast MRI. To capture the peak contrast enhancement, it is recommended that scanning should start within 1 to 2 minutes of contrast injection. Each post-contrast scan duration should be between 1 to 2 minutes.

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