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Direct MR arthrography of the shoulder: 2D vs. 3D gradient-echo imaging
R Wutke1, F A Fellner, C Fellner
1Institute of Diagnostic Radiology, Friedrich-Alexander-University Erlangen-Nuernberg Maximilliansplatz 1, D-91054 Erlangen, Germany. ralf.wutke@idr.imed.uni-erlangen.de
Magnetic Resonance Imaging
|January 5, 2002
Summary
A fat-suppressed 3D gradient-echo (GRE) sequence offers slight advantages over a 2D GRE sequence for evaluating the shoulder labrum and middle glenohumeral ligament in MR arthrography. However, significant diagnostic benefits were not observed for cartilage or overall pathology detection.
Area of Science:
- Radiology and Imaging Science
- Orthopedic Imaging
- Magnetic Resonance Imaging (MRI)
Background:
- Direct MR arthrography is a key imaging technique for shoulder disorders.
- Gradient-echo (GRE) sequences are utilized for shoulder MRI, with varying dimensional approaches (2D vs. 3D) and fat suppression techniques.
- Evaluating the diagnostic performance of different GRE sequences is crucial for optimizing shoulder MR arthrography protocols.
Purpose of the Study:
- To compare the diagnostic value of a fat-suppressed 3D GRE sequence versus a 2D GRE sequence in shoulder MR arthrography.
- To assess the efficacy of these sequences in visualizing specific shoulder structures and detecting pathological findings.
Main Methods:
- Fifty patients with subacute or chronic shoulder disorders underwent 1.5 T MRI.
- Imaging protocols included transverse T1-weighted 2D GRE (4 mm slice thickness) and 3D GRE (1.5 mm reconstructed from 3 mm slice thickness) sequences.
- Oblique coronal T2- and T1-weighted turbo spin-echo (TSE) and sagittal T1-weighted TSE with fat saturation were also applied; image analysis by two observers was correlated with surgical results in 21 patients.
Main Results:
- Transverse GRE sequences demonstrated suitability for analyzing the anterior/posterior labrum, middle glenohumeral ligament, and cartilage.
- The 3D GRE sequence with fat suppression showed a slight superiority over the 2D GRE sequence for evaluating the anterior/posterior labrum and middle glenohumeral ligament.
- No significant differences were found between the 2D and 3D GRE sequences for cartilage evaluation, and both provided similar results for most pathological findings.
Conclusions:
- A T1-weighted 3D GRE dataset with fat saturation in transverse orientation may be beneficial for assessing the anterior/posterior labrum and middle glenohumeral ligament.
- Despite interpolation, the 3 mm slice thickness of the 3D sequence did not offer significant diagnostic advantages over the 4 mm slice thickness of the 2D sequence.
- The study suggests that while 3D GRE shows marginal benefits for specific structures, 2D GRE remains effective for overall shoulder pathology detection in MR arthrography.