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1.5T Hi-res MRA of aorta using navigator for MotionTrak - Japan

ExamCard
Matsumoto, Mitsuyo, R.T. Philips Healthcare
Suwa, Akira, R.T. Philips Healthcare

1.5T High Resolution MRA of aorta using navigator for MotionTrak - Japan

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ExamCard purpose

The purpose of this ExamCard, for Release 1.2.2, is to improve the resolution of MRA examinations of the thoracic aorta using MotionTrak. For this ExamCard no contrast agents are needed.

ExamCard overview

Arch MRA
Scan 1Survey
Scan 2Ref SBC ref
Scan 3BFE M2D BH tra
Scan 4BFE CINE BH arch
Scan 5BFE M2D RT arch
Scan 6T1w BB BH tra
Scan 7B-TFE Navi arch

Note: both scan techniques (M2D B-TFE with respiratory triggering and 3D B-TFE with navigator tracking) are available in the ExamCard, making it available to all customers.

Planning

The patient is positioned supine on the examination table. The SENSE Body Coil is used throughout the examination. The 3 point planscan option is used for planning.
Three point planning The 3 points used during planning are: one in the arch, one in the ascending and one in the descending portion of the aorta.<br>
Three point planning
The 3 points used during planning are: one in the arch, one in the ascending and one in the descending portion of the aorta.
 Stack positioning on the sagittal view during planning Stack positioning on the axial view during planning
Stack positioning on the sagittal view during planning
Stack positioning on the axial view during planning

ExamCard images

M2D B-TFE RT 3D B-TFE Navi Retrospective cardiac sync <br>
R-R window 20, 30 % <br>
M2D B-TFE RT
3D B-TFE Navi
Retrospective cardiac sync
R-R window 20, 30 %

 

Note the better delineation of the aortic disection in the images of the 3D B-TFE series, compared to those of the M2D B-TFE series. This is due to the increase in the image resolution, while using MotionTrak, in the 3D B-TFE sequence. The M2D B-TFE sequence is acquired using respiratory triggering. 

M2D B-TFE RT 3D B-TFE Navi Respiratory comp gated<br>
Number of slices 100<br>
Slice thickness 1mm<br>
TSE factor 30 <br>
Profile order low/high <br>
Turbo direction radial <br>
M2D B-TFE RT
3D B-TFE Navi
Respiratory comp gated
Number of slices 100
Slice thickness 1mm
TSE factor 30
Profile order low/high
Turbo direction radial

 

In the 3D B-TFE series, using MotionTrak, there is an homogenous signal intensity in the aorta  regardless of blood flow turbulance. The short acquisition time, using a TSE factor of 30, has contributed to this. However, in the M2D B-TFE series, there are visable signal variations due to turbulance.

Post-processing / analysis

3D volume rendering using ViewForum
3D volume rendering using ViewForum

 

Due to the high resolution and almost iosotropic voxel size in the 3D B-TFE series, it is possible to create high quality post-processed 3D volume renderings from these images.



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Dec 6, 2007

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ExamCard
Achieva 1.5T
Release 1
Thoracic MRA, Vascular
 

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