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MobiFlex with the PV-Coil - Trier

Busch, Hans-Peter, M.D. Krankenhaus der Barmherzigen Brüder • Germany

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Scan 2Ref_SPVC_UP
Scan 3Ref_SPVC_MI
Scan 4Ref_SPVC_LO
Scan 5Timing
Scan 6LowerLeg
Scan 7UpperLeg
Scan 8Pelvis
Scan 9Pelvis
Scan 10UpperLeg
Scan 11LowerLeg

Features used in this ExamCard:

  • Geolinks are applied between the different stations to group the three stations. This grouping is recognized by the VolumeView package, allowing a single-button MIP postprocessing for all stations.
  • ScanAlign is applied for planning all stations as one volume and it is used to ensure a certain overlap between the stations.
  • Manual or automatic table movement. Automatic table movement can be chosen for an easy workflow of MobiFlex.
  • SENSE can be used either with a SENSE-body coil or with the SENSE PV coil, for further optimization of the acquisition speed or resolution.


  • Position the lower part of the SENSE PV coil over the end of the tabletop in such a way that only a few milimeters are left between the MR system and the coil. Consequently. it is still possible to move the table up and down.
  • Ensure the center position of the pelvic station is not positioned beyond the markers on the tabletop
  • Position the patient on the coil (feet first).
  • Place soft cushions between the lower legs of the patient.
  • Position the feet slightly in exo-rotation with the ankle cushion under the achilles tendon.
  • The knee cushion has to be positioned a litlle above the back of the knees. Immobilize ankles and knees with straps .
  • Position the upper part of the SENSE PV coil on the patient. Coil will rest on abdomen and on the cushion between the lower leg.
  • Connect upper and lower part of the coil

Injection Protocol

The Timing protocol:

  • 1,3 ml/s  2ml Gado 0,5M
  • 1,3 ml/s 16ml NaCl


The injection protocol:

  • 1,3 ml/s 18ml Gado 0,5M
  • 0,6 ml/s 20ml Gado 0,5M
  • 0,6 ml/s 20ml NaCl


  • Start SURVEY.
  • Fuse the orthogonal MIP's with MobiView and save images to database.
  • Load the saved MobiView images in the planning environment.
  • Plan the MobiFlex and the Timing sequences on the fused images.
  • Prepare the contrast injection for the Timing protocol (see above).
  • Start the injection and the Timing sequence simultaneously. Determine the timing delay.
  • Start the MobiFlex sequence. After the mask acquisition of the lower and upper legs, a breathhold is required at the pelvis level.
  • Program the contrast injector for the full bolus injection protocol (see above).
  • The ExamCard will pop up a manual start again the of the pelvis level (step 8). Start giving a breath-hold instruction about 15 seconds prior to the determined delay time and end with an inspiration at the delay time. Press the proceed button.
  • After reconstruction, the mask and Gd enhanced images can be subtracted with the subtraction tool. Use "all stations" to perform the subtraction automatically for all station.
  • Use the VolumeView package to create MIPs of the subtracted result. You can use propagation over stations (propagate tab, propagate stations, single axis) for fast workflow.
  • The resulting MIPs can be loaded and fused in the MobiView package.
  • Save the images to the database. These images can be exported to e.g. PACS systems.

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Nov 26, 2004

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