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Abdominal imaging on 3.0T

Application Tip
Jones, Alun Philips Healthcare Philips Global
van den Heuvel, Martina Philips Healthcare Philips Global

This application tip gives tips and hints with respect to abdominal imaging on 3.0T.

Note that there are more Application Tips related to this topic.

 

Body MRI: dealing with typical 3.0T issues as SAR, SNR, artifacts and measures to take to overcome these artifacts.

Pelvic imaging: dealing with specific sequences and typical parameter settings and / or showing clinical examples.

Imaging parameters

  • Use SENSE to reduce the TSE factor. SAR and blurring will also decrease.

  Apply body tuned SENSE / CLEAR to improve image homogeneity.

 

  • Use SPAIR for accurate fat suppression.

  SPAIR is B1 independent. It requires the input of a delay time. Its value depends on the type

  of the sequence and the SPAIR TR. In THRIVE scans, increase the TFE factor (up to 100) in 

  order to reduce scan times. SPAIR is the fat suppression of choice for 3.0T as the

  fat suppression is very effective and uniform. 

 

  • A FOV of 400 mm in FH direction is possible.

 

  • Shared REST slabs are used to reduce inflow artifacts in FFE breath-hold scans.

 

 

Body tuned SENSE - Comparison Upper row: Body tuned SENSE off (local Signal loss due to B1 mirroring)<br>
Lower row: Body tuned SENSE onSingle Shot TSE, 5 mm slice thickness Upper row: TE 120 ms,<br>
Lower row: TE 210 ms.Single Shot TSE: SPIR versus SPAIR Upper row: SPIR,<br>
Lower row: SPAIR.
Body tuned SENSE - Comparison
Single Shot TSE, 5 mm slice thickness
Single Shot TSE: SPIR versus SPAIR
Upper row: Body tuned SENSE off (local Signal loss due to B1 mirroring)
Lower row: Body tuned SENSE on
Upper row: TE 120 ms,
Lower row: TE 210 ms.
Upper row: SPIR,
Lower row: SPAIR.

Scan methods

  • Use a Single Shot TSE sequence for T2w scans as this type of sequence freezes motion.

   This scan is best performed with respiratory triggering to reduce SAR and improve image
   contrast.

 

  • Be aware that b-FFE and b-TFE scans suffer much more from artifacts than on 1.5T. Black

   band artifacts occur closer to the center of the image.  

   *  Use short TR/TE to reduce presence of banding.
       This can be achieved a lower phase matrix and a scan percentage > 100%.

   *  The scan can either be performed as free-breathing or breath-hold scan.  

   

  • For T1w imaging, use the T1 FFE IP (in phase) scan with a TE of 2.3 ms or 4.6 ms with a shared REST.

   The slice thickness is set to 7 mm for whole liver coverage. The slice thickness can easily be

   reduced to 5 mm or less due to the excellent SNR. The shared REST is used to reduce inflow

   artifacts. 

 

  • Run the Dual FFE scan with a 1st TE out of phase at 1.15 ms, a 2nd TE in phase at 2.3 ms.

   A slice thickness of 5 mm or less is possible. A shared REST is used to reduce inflow rtifacts.

 

  • Perform the Multi-echo multislice GRASE Breathhold scan which covers the whole liver by 2 breathholds of 20 s. Body tuned SENSE is used. T2 measurements can be done.

 

  • Perform the Single Shot MRCP scan with SPAIR fat suppression, a FOV of 300 mm and a 256 scan matrix. Due to the excellent SNR, thinner slices are possible.
    The scan time seems to be longer than on 1.5T, but this is just in-built delay time due to SAR limitation.

 

  • An alternative is the 3D MRCP: 3D TSE, respiratory triggered, using SENSE (factor 2) and SPIR, 80 coronal slices, TSE-factor 87 with 20 startup-echoes, higher order shimming within 3:22 min.
Abdominal images Upper left: b-TFE scan visualizing portal venous system;<br>
Upper right: THRIVE 2.0 mm x 2.0 mm x 1.0 mm voxel. <br>

Lower row: T1 FFE IP (in phase) 7 mm slice thickness, left: standard, right: high resolution scan.Dual FFE 1st TE: out of phase 2.3 ms, <br>2nd TE: in phase 5.75 ms.
<br>Upper row: 7 mm slice thickness,<br>
Lower row: 5 mm slice thickness.T2w TSE Kidneys respiratory triggered Large FH FOV, 0.8 mm x 1.0 mm x 3.0 mm, scan time 1:30 min.
Abdominal images
Dual FFE
T2w TSE Kidneys respiratory triggered
Upper left: b-TFE scan visualizing portal venous system;
Upper right: THRIVE 2.0 mm x 2.0 mm x 1.0 mm voxel.
Lower row: T1 FFE IP (in phase) 7 mm slice thickness, left: standard, right: high resolution scan.
1st TE: out of phase 2.3 ms,
2nd TE: in phase 5.75 ms.
Upper row: 7 mm slice thickness,
Lower row: 5 mm slice thickness.
Large FH FOV, 0.8 mm x 1.0 mm x 3.0 mm, scan time 1:30 min.


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Application Tip
Achieva 3.0T, Intera 3.0T
Release 1, Release 10, Release 11, Release 9
Master / Quasar Dual, Quasar Dual
Body, Kidneys, Liver, Pancreas
 

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