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1.5T Blood pool agent MRA: peripheral angiography - Bonn

ExamCard
Willinek, Winfried, M.D. Bonn, University of Bonn
Gieseke, J�rgen Philips Healthcare

1.5T Blood pool agent MRA: peripheral angiography - Bonn University Hospital

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ExamCard purpose

Ablavar/Vasovist will stay in the vasculature for about 1 hour after injection of the contrast medium.

A first-pass image is acquired, just like with an extracellular contrast agent. MobiFlex is used to optimize the resolution and scan time per station. The results can be viewed using MobiView.


In the so-called 'steady state' of the contrast agents, several minutes after contrast injection, high resolution steady state images are acquired.

 

ExamCard overview

VASOVIST PERIPHERAL

Survey Inflow survey, showing relevant anatomy in the 3 stations.Mask image for steady state A high resolution mask image is acquired in all three stations.BolusTrak BolusTrak must be used for timing of the acquisition.
Survey
Mask image for steady state
BolusTrak
Inflow survey, showing relevant anatomy in the 3 stations.
A high resolution mask image is acquired in all three stations.
BolusTrak must be used for timing of the acquisition.
MobiView First pass A first pass acquisition is performed using MobiFlex.Steady state image High resolution steady state image.Subtracted image Using the mask image, a subtracted image has been created.
MobiView First pass
Steady state image
Subtracted image
A first pass acquisition is performed using MobiFlex.
High resolution steady state image.
Using the mask image, a subtracted image has been created.

Acquired resolution

First pass

  • Pelvis:        1.48x2.33x3.20, reconstructed to 1.04x1.04x1.60
  • Upper legs: 1.48x2.33x3.00, reconstructed to 1.01x1.01x1.50
  • Lower legs: 1.13x1.77x2.20, reconstructed to 0.88x0.88x1.10

 

Steady state

  • Pelvis:        1.13x1.48x3.00, reconstructed to 0.88x0.88x1.50
  • Upper legs: 1.08x1.42x1.98, reconstructed to 0.88x0.88x0.99
  • Lower legs: 0.97x0.97x0.98, reconstructed to 0.52x0.52x0.49

Patient preparation

Position the patient feet first on the MobiTrak device.
The SENSE Body coil is used in the lower leg station.

The other stations are scanned with the Q-body coil.

 

NOTE: BolusTrak must be used for timing of the acquisition. Use of a timing bolus will cause venous contamination in the first pass images, due to the intravascular nature of the contrast agent.

Contrast agent / injection protocol

Vasovist is injected at 1.2 ml/sec, for a total of 0.03 mmol/kg body weight, followed by a 25 ml saline flush.



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Oct 27, 2008

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ExamCard
Achieva 1.5T
Release 1, Release 2
Peripheral MRA, Vascular
 

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