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1.5T Multistack head/neck MRA - Japan

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

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ExamCard purpose

The purpose of this ExamCard, for Release 1.2.3, is to use multistacks to acquire high spatial resolution images, together with a high temporal resoultion, for both the brain and neck regions of an MRA examination using MobiFlex.

ExamCard overview

Patient preparation

The 16-channel SENSE NeuroVascular coil was used.

ExamCard images

Stack 1: Head MRA FOV: 220mm<br>
Matrix: 384<br>
Scan: 40%<br>
Slice/thickness: 150/0.6mm<br>
TR/TE/FA: 20/6.9/18<br>
Scan time: 3:25Stack 2: Neck MRA FOV: 220mm<br>
Matrix: 256<br>
Scan: 50%<br>
Slice/thickness: 156/0.75mm<br>
TR/TE/FA: 16/6.9/18<br>
Scan time: 3:17Stack 3: Aorta MRA FOV: 300mm<br>
Matrix: 288<br>
Scan: 50%<br>
Slice/thickness: 120/0.8mm<br>
TR/TE/FA: 14/6.9/16<br>
Scan time: 3:25
Stack 1: Head MRA
Stack 2: Neck MRA
Stack 3: Aorta MRA
FOV: 220mm
Matrix: 384
Scan: 40%
Slice/thickness: 150/0.6mm
TR/TE/FA: 20/6.9/18
Scan time: 3:25
FOV: 220mm
Matrix: 256
Scan: 50%
Slice/thickness: 156/0.75mm
TR/TE/FA: 16/6.9/18
Scan time: 3:17
FOV: 300mm
Matrix: 288
Scan: 50%
Slice/thickness: 120/0.8mm
TR/TE/FA: 14/6.9/16
Scan time: 3:25

 

Stack 1: Good delineation of small vessels.

 

Stack 2: The spatial resolution is reduced to shorten the scan time, enabling a larger coverage of area.

 

Stack 3: The REST is changed from parallel to free and with no TONE. This results in a good signal intensity and delineation of the subclavian arteries.

Parallel REST with TONE Free REST with no TONE
Parallel REST with TONE
Free REST with no TONE
Parallel REST with TONE The delineation of the subclavian artery is poor.Free REST with no TONE Better delineation of the subclavian artery.
Parallel REST with TONE
Free REST with no TONE
The delineation of the subclavian artery is poor.
Better delineation of the subclavian artery.

Merging stacks using MobiView

The stacks merged using MobiFlex
The stacks merged using MobiFlex

Comparison between single and multistack

Single stack Multistack
Single stack
Multistack
The ROIs indicate the same regions in the single and multistack images. Note the differences in image resolution, signal intensity and vessel delineation. Those of the multistack are superb.

Post-processing / analysis

MIP with inverted contrast
MIP with inverted contrast
Maximum Intensity Projection (MIP) can be created and in this example the contrast is inverted. Several views from different angles have been saved, enabling a good review of the vessels.


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Added:
Dec 13, 2007

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ExamCard
Achieva 1.5T
Release 1
Brain, Carotid, Extracranial MRA, Vascular
 

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