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Ingenia 1.5T Compressed SENSE for lumbar spine MRI of patient with MR Conditional implant

ExamCard
Calderin, Carlos MRI SPECIALISTS • USA
Snicer, Jim Philips Healthcare • USA
Mr. Reese, David, R.T. Philips Healthcare • USA

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ExamCard description

This Release 5.4 ExamCard is developed on Ingenia 1.5T for lumbar spine imaging in presence of MR Conditional implants. ScanWise Implant is used to adhere to the implant's safety conditions and Compressed SENSE helps to achieve this in a reasonable scan time.

The example images show use on a patient with surgical metal in the lumbar spine and a Medtronic brain stimulator, for which Medtronic specified the following conditions:
  • Maximum spatial field gradient value must be less then, or equal to, 1900 Gauss/cm.
  • Maximum slew rate value for the implant is less then, or equal to, 200 T/m/sec.
  • Maximum RF energy applied during the study must be either less then, or equal to, 0.1 W/kg or 2 uT B1+rms.
 
Just adjusting the ExamCard to fit within the specified SAR value of maximum 0.1 W/kg, would dramatically increase the scan time to a total of 4 hours and 9 minutes!

Using ScanWise Implant provides a step-by-step guidance for entering the condition values as specified by the implant manufacturer, after which the MR system applies these values automatically for the entire examination.

By entering the maximum specified SAR value of 2 uT B1+rms, the total scan time could be reduced to 49 minutes. However, the maximum scan duration for this MR Conditional implant to be within the MR scanner is specified to not exceed a total of 30 minutes. 

By integrating Compressed SENSE into the ExamCard the total exam time could be further reduced to 28 minutes.

A combination of the integrated dS Posterior coil and the dS Torso coil was used to enhance the signal-to-noise ratio and Compressed SENSE performance.

ExamCard overview

ExamCard images

Click on an image to enlarge
Sagittal T2w TSE Scan time 5:28 min. <br>
Voxels 0.8 x 0.9 x 4.0 mmAxial T2w TSE Scan time 7:11 min. <br>
Voxels 0.6 x 0.9 x 4.0 mm
Sagittal T2w TSE
Axial T2w TSE
Scan time 5:28 min.
Voxels 0.8 x 0.9 x 4.0 mm
Scan time 7:11 min.
Voxels 0.6 x 0.9 x 4.0 mm
Axial T1w TSE Scan time 4:44 min. <br>
Voxels 0.9 x 1.0 x 4.0 mmAxial T1w TSE post-contrast Scan time 4:44 min. <br>
Voxels 0.9 x 1.0 x 4.0 mm
Axial T1w TSE
Axial T1w TSE post-contrast
Scan time 4:44 min.
Voxels 0.9 x 1.0 x 4.0 mm
Scan time 4:44 min.
Voxels 0.9 x 1.0 x 4.0 mm
Sagittal T1w TSE (post-gado) Scan time 5:33 min. <br>
Voxels 0.9 x 1.0 x 4.0 mm
Sagittal T1w TSE (post-gado)
Scan time 5:33 min.
Voxels 0.9 x 1.0 x 4.0 mm


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Apr 2, 2019

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ExamCard
Ingenia 1.5T
Release 5
brain stimulator, Compressed SENSE, dStream, Lumbar spine, metal, metal artifact reduction, MR Conditional implant, Neuro, ScanWise Implant, Spine
 

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