By Michael B. Zlatkin MD FRCP(C)
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Loop coil. For optimal performance, the loop coil must be oriented such that the B1 field of the coil (arrow) lies in a plane that is orthogonal to the B0 field of the magnet. 2. Butterfly coil. For optimal performance, the butterfly coil must be oriented such that the B1 field of the coil (arrow) lies in a plane that is orthogonal to the B0 field of the magnet. 3. Set of large and small loop coils. 4. ) As this technique gained acceptance, coil manufacturers began making single-turn solenoid “loop” coils with a larger hole in the middle.
This approach also has some limitations. As the separation of the anterior loop and posterior loop changes due to patient size, the coil frequency also changes. The result is that signal-to-noise performance degrades as the separation changes. 23 levels. Manual or automatic coil tuning required additional time and was not always reliable. 5. Helmholtz coil. Two general-purpose 5-in. coils, with connecting device. As with all coils, proper positioning is very important. Various coil-positioning aids, similar to chemistry laboratory ring stands, were developed either by MRI manufacturers or MRI practitioners who had seized upon this technique.
The glenohumeral joint space normally communicates with the subscapularis bursa between the superior and middle glenohumeral ligaments (26,47). The subscapularis bursa is present in 90% of individuals. The subacromial-subdeltoid bursa and the subcoracoid bursa communicate with one another. Therefore, the presence of contrast within the subacromial-subdeltoid bursa during MR arthrography may indicate a full-thickness rotator cuff tear (11,23,26), or alternatively they could be due to inadvertent injection of contrast material into the subcoracoid bursa (2).