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Comparing 2D with 3D using Compressed SENSE in the knee

Case Study
Sartoretti, Sabine, M.D. Institute of Radiology, Kantonsspital Winterthur • Switzerland

As soon as the Compressed SENSE technology became available to the MRI team at Kantonsspital Winterthur (KSW, Switzerland), the site started applying the acceleration possibilities for their MRI scans of the brain, spine and joints as well as pelvis and abdomen.

 

Using Compressed SENSE appeared a simple yet powerful way to accelerate MRI scanning for different contrast types and sequences, in 2D as well as 3D.

MR examination

The KSW team also started implementing Compressed SENSE in MRI exams of joints, for replacing the 2D PD fat sat with 3D PD fat sat. So far, results look good: it’s possible to obtain a good acquisition time with a high resolution.

 

In the knee, a good acquisition time with high resolution is obtained when moving from three 2D acquisitions in three planes to one 3D acquisition with Compressed SENSE. In this example, Compressed SENSE with 3D VIEW PD SPAIR is 50% faster than three separate 2D scans and has improved spatial resolution.

 

Without Compressed SENSE, three separate 2D PD scans are acquired in three orientations. The total scan time of the three scans is 2:55 + 3:37 + 3:51 = 10:23 min. and voxel size is

0.55 x 0.65 x 3 mm

 

With Compressed SENSE factor 10, a high resolution 3D VIEW PD SPAIR of the knee is acquired in only 5:03 min. with isotropic voxel size 0.6 x 0.6 x 0.6 mm. so that other orientations are viewed with MPR.

 

Click on an image to enlarge

 

Three separate 2D PD scans   10:23 min.                  3D VIEW PD SPAIR   5:03 min.

 2D sagittal without Compressed SENSE
Voxel size 0.55 x 0.65 x 3 mm 3D VIEW with Compressed SENSE <br>
Voxel size 0.6 x 0.6 x 0.6 mm<br>
2D sagittal without Compressed SENSE Voxel size 0.55 x 0.65 x 3 mm
3D VIEW with Compressed SENSE
Voxel size 0.6 x 0.6 x 0.6 mm
 2D transverse without Compressed SENSE<br>
Voxel size 0.55 x 0.65 x 3 mm MPR<br>
Voxel size 0.6 x 0.6 x 0.6 mm<br>
2D transverse without Compressed SENSE
Voxel size 0.55 x 0.65 x 3 mm
MPR
Voxel size 0.6 x 0.6 x 0.6 mm
 2D coronal without Compressed SENSE<br>
Voxel size 0.55 x 0.65 x 3 mm MPR<br>
Voxel size 0.6 x 0.6 x 0.6 mm<br>
2D coronal without Compressed SENSE
Voxel size 0.55 x 0.65 x 3 mm
MPR
Voxel size 0.6 x 0.6 x 0.6 mm

Impact of using Compressed SENSE in this case

A good acquisition time with high resolution is obtained in one 3D VIEW acquisition with Compressed SENSE, with freedom to do reconstructions afterwards. The team envisions to finally end up with musculoskeletal ExamCards consisting of three sequences, for example 3D PD-weighted fat sat – which is the most important sequence in MSK – plus a T1 and a STIR sequence. Or alternatively two T1 sequences and the 3D sequence.

 

 

Read more in

FieldStrength article: Faster MRI throughout the whole body with Compressed SENSE

 

 

 

 

Results from case studies are not predictive of results in other cases. Results in other cases may vary.



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Apr 10, 2018

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Case Study
Achieva 3.0T, Ingenia 1.5T
3D VIEW PD SPAIR, Compressed SENSE, knee, Musculoskeletal
 

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