Scan Notes: It is absolutely critical that the pre-contrast and post-contrast images line up exactly so that there is no mis-registration on the subtracted images.
To this end: 1) immobilize the affected limb with a sandbag across the ankle; and 2) minimize patient stimulation during the administration of contrast by either using the power injector at a low flow rate (1ml/sec) or hand inject through an extension. Do not remove the patient from the scanner to facilitate the injection.
See the following references for more information: www.perthesdisease.org
Charge as: Hips WWO
Scanner preference: 3T Ingenia ONLY - DCH7 or MR4
Coil: Torso or Cardiac
Scan Notes: Images must be checked by radiologist or radiology resident before giving contrast and before the patient gets off the table.
|COR||T2 Fat Sat||TSE||4mm||0mm||SPAIR||24cm|
|COR||T1 Fat Sat||TSE||4mm||0mm||SPIR||24cm|
|SAG||T1 Fat Sat||TSE||4mm||0mm||SPIR||18cm|
Use power injector at reduced flow rate (1ml/sec) or extension tubing. Do not remove patient from scanner to perform injection. Wait 2 minutes after injection is complete before starting post-contrast scans.
|COR||T1 Fat Sat||TSE||4mm||0mm||SPIR||24cm||Perform manual subtraction (post-pre)|
|SAG||T1 Fat Sat||TSE||4mm||0mm||SPIR||18cm||Perform manual subtraction (post-pre)|
Post-Processing: Perform manual subtractions of the coronal and sagittal T1 Fat Sat sequences – postcontrast – precontrast = subtracted image. It should look like this: