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1.5T Full length humerus with dual coils - Scottsdale Healthcare

ExamCard
Macauley, Robert, MBA, ARRT. R,QM,CT,MR Scottsdale Healthcare USA
Brock, Linnea, R.T. Scottsdale Healthcare USA

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1.5T Full length humerus with dual SENSE Flex coils - Scottsdale Healthcare

ExamCard purpose

For MRI of the full length humerus we found using the dual coil setup with SENSE Flex L and SENSE Flex M coils in line provides high quality imaging, either with the arm extended above the head in 'superman position' or with the arm positioned at the patient's side. The patient's arm is placed inside the loops of the coils at an angle for a slight overlap.

 

The ExamCard is for Achieva 1.5T release 2.5.

Humerus Flex LM coils
Scan 1Ref Flex L
Scan 2Cor STIR optional
Scan 3Cor T1
Scan 4Sag T2
Scan 5Sag T1
Scan 6Ax T2
Scan 7Ax T1

Please note that not all help text was updated after optimizing the ExamCard for this application.

Patient positioning for full length humerus with dual SENSE Flex coils

Use caution with coils wrapping. Use plenty of insulation between coils and bore.

Be careful to keep cables from touching the patient or looping one another.

Be aware to not position coil loops perpendicular to the field lines (so not concentric with bore).

 

Adapt to the superman position or place arm along the patient's side.

Place the coils by putting the arm through the center opening of the coils.

 

Start with the Flex L coils. Place the Flex L coil on the shoulder at an angle, touching points of center armpit and AC joint. The tail of the coil will rest between the humerus and the chest wall, if it is along the side of the body.

 

Subsequent placement of the other coils is the same. Place them parallel to the top coils and equally space them to reach below the elbow. The coils will parallel each other and lean at the same angle giving them a slight overlap.

 

Move the humerus to the center of the bore as much as possible.

 

 

Superman position This works best if the patient is able to hold position.
Superman position
This works best if the patient is able to hold position.
Humerus at side position Comfort and safety are key.Equal coil spacing and angulation Rolling the patient up on their side a bit enables more centralization of the arm in the bore.
Humerus at side position
Equal coil spacing and angulation
Comfort and safety are key.
Rolling the patient up on their side a bit enables more centralization of the arm in the bore.

 

 

Use two stacks in axial scans to avoid FOV cut off. If you get cut off on sagittal and coronal views, you will need to move the humerus more towards center or increase the FOV to 450 mm or higher and turn the FOV image shutter off. SENSE and CLEAR may not be an option depending on the FOV.

 

Use flow compensation on coronal and sagittal scans to reduce risk of flow artifacts. 

Use phase direction FH on sagittal scans. Use phase direction RL on coronal scans with sat bands over the chest.

 

Note: For extra large patients you may have to resort to the integrated Q Body coil. If so, the sequences and positoning will require another approach almost entirely.

 

Images

 These full length coronal and sagittal T1-weighted images show that the FOV must be large and care must be taken to turn the image shutter off when necessary.<br><br><br>
These full length coronal and sagittal T1-weighted images show that the FOV must be large and care must be taken to turn the image shutter off when necessary.


 Full length coverage axial images are scanned in two separate stacks.  <br>The full length STIR images help localize pathology.
Full length coverage axial images are scanned in two separate stacks.
The full length STIR images help localize pathology.


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Nov 7, 2008

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ExamCard
Achieva 1.5T
Release 2.5
Elbow, Musculoskeletal, Shoulder
 

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