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Meniscal tear imaging on Achieva 1.5T dStream

Case Study
Loegering, Robert, D.O. Hennepin County Medical Center • USA
Truwit, Chip, MD, FACR Hennepin County Medical Center • USA

Patient history

A 37-year-old male presented with chronic left knee pain and a remote history of injury. The physical exam suggested a meniscal injury. No prior imaging was available. The patient was referred for MRI at Hennepin County Medical Center.

MR examination

MRI was performed on an Achieva 1.5T dStream system using the 16-channel dS Knee coil.
The exam includes sagittal and coronal proton density TSE and T2W SPAIR sequences as well
as an axial T2W SPAIR sequence.


Click on an image to enlarge.
 dStream PDW<br> dStream T2W SPAIR<br>
dStream PDW
dStream T2W SPAIR

Sagittal proton density and T2W SPAIR images demonstrate extensive abnormal signal in the body and posterior horn of the medial meniscus with extension to both the tibial and femoral articular surfaces. There is an additional multi-lobular cyst abutting the meniscal root that extends posterior to the posterior cruciate ligament.


The diagnosis is a complex horizontal tear involving the body and posterior horn of the medial meniscus with associated para meniscal cyst.

Clinical impact

The Achieva 1.5T dStream system clearly demonstrates the meniscal tear as well as the para meniscal cyst, providing image quality of the pathology and adjacent structures similar to that of 3.0T.


The sagittal proton density-weighted image (below) from pre-dStream Achieva 1.5T in another patient, while still a good quality image, reveals the advantages of the dStream enhancement. Note the image quality of the cartilage, marrow trabeculation, menisci as well as the meniscocapsular ligaments does not quite meet the standard of the 1.5T dStream upgrade.

 Achieva 1.5T PDW for comparison (other patient)<br><br><br>
Achieva 1.5T PDW for comparison (other patient)

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Jul 25, 2014

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Case Study
Achieva 1.5T dStream
dStream, Knee, meniscus, Musculoskeletal, SmartPath to dStream

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