Week 10 Flashcards
spine imaging is done mainly __
sagittal & axial
when is coronal plane used for spinal imaging
if patient has moderate to severe scoliosis / lesion
what is best used for anatomical detail
T1w
fat is bright on __
T1, T2 and PD
fluid is brightest in __
T2
what is good for screening fluid & pathology
STIR & T2 FS
what is PD FSE used for
meniscal tears, tendinopathy, labral tears
what are used for pathological processes
T2W FSE
T2W FSE + FS
STIR
T1W FS + C
MRI cervical spine patient positioning
- Headfirst supine
- Position head in birdcage coil & immobilized with cushions
- Cushion under legs for extra comfort
- Laser target over mid neck (2.5 cm below chin in chin-down position)
MRI cervical spine axial scan range is __
- Positioning block perpendicular to spinal cord
- Parallel to IV disc space
- Range = Mid C2 to Mid T2 vertebral body
MRI cervical spine sagittal scan range is __
- Positioning block parallel to spinal cord
- Parallel to line along center of vertebral body through length of spinous process, right to left transverse process
- Range = Brain stem to mid T2
MRI thoracic spine axial scan range is __
- Positioning block perpendicular to spinal cord
- Parallel to IV disc space
MRI thoracic spine patient positioning
- Headfirst supine
- Position head in birdcage coil & immobilized with cushions
- Cushion under legs for extra comfort
- Laser target over mid sternum (T4/5)
MRI thoracic spine sagittal scan range is __
- Positioning block parallel to spinal cord
- Parallel to line along center of vertebral body through length of spinous process, right to left transverse process
- Range = Mid C7 – Mid L2
MRI thoracic spine SAG STIR used for
detecting spinal metastasis
MRI lumbar spine patient positioning
Headfirst supine
Position head in birdcage coil & immobilized with cushions
Cushion under legs for extra comfort
Laser target over mid abdomen
MRI lumbar spine axial scan range is __
Positioning block perpendicular to spinal cord
Parallel to IV disc space
Range = mid T11 – S3
MRI lumbar spine sagittal scan range is __
Positioning block parallel to spinal cord
Parallel to line along center of vertebral body through length of spinous process, right to left transverse process
FOV = entire lumbar & sacral spine from T11 to coccyx
MRI shoulder patient positioning
Supine with head towards magnet (headfirst supine)
Shoulder in shoulder coil & immobilized using sandbags
Centre laser over shoulder joint or midline of coil
MRI shoulder sagittal scan range is __
Angle position block perpendicular to supraspinatus tendon
Parallel to humerus
Range = entire shoulder joint from deltoid muscle to scapular notch
MRI shoulder axial scan range is __
Position block perpendicular to glenohumeral joint
Perpendicular to humeral head
Range = Top of AC joint to just below glenohumeral joint below axilla
MRI shoulder coronal scan range is __
Position block parallel to supraspinatus tendon
Parallel to humeral head
Range = cover entire shoulder joint
MRI wrist patient positioning
Head first prone with arm up (superman)
Position wrist in wrist coil or small flex coil & immobilized with cushions
Cushion under chest for extra comfort
Center laser beam localizer over wrist joint
MRI wrist coronal scan range is __
Position block horizontally across carpal bones
Covers wrist joint from dorsal to palmar aspect
MRI wrist axial scan range is __
Range = 1 inch above CMC joint to 1 inch below distal DRUJ
Position block horizontally across wrist joint
MRI wrist sagittal scan range is __
Angulate till coronal plane crossing carpal bones vertically
Position block vertically across carpal bones
MRI knee patient positioning
Supine with feet first
Position knee in knee coil & immobilize under cushions
Give cushions under ankles for more comfort
Target beam over lower border of patella
MRI knee sagittal scan range is __
Planning block parallel to lateral femoral condyle
Parallel to midline of femur & tibia
MRI knee axial scan range is __
Range = superior border of patella to tibial tuberosity
Planning block parallel to medial & lateral femoral condyle
Angulate in sagittal till perpendicular to line of femur & tibia
MRI knee coronal scan range is __
Range = patella till soft tissues posterioly
Planning block parallel to medial & lateral femoral condyle
Parallel to midline of femur & tibia
MRI knee sagittal oblique scan range is __
Parallel to anterior cruciate ligament
Parallel to inner margin of lateral condyle
MRI ankle patient positioning
Supine with feet towards magnet
Ankle angled 90 degrees using ankle coil
Laser beam localiser over ankle joint
MRI ankle axial scan range is __
Range = 2 inches above tibiotalar joint down to plantar aspect of foot
Parallel to tibiotalar joint
Position block parallel to tibiotalar joint
MRI ankle sagittal scan range is __
Range = outer border of medial malleolus to outer border of lateral malleolus
Position block perpendicular to line between medial & lateral malleoli
MRI ankle coronal scan range is __
Range = covers ankle joint from achilles tendon to midfoot
Parallel to tibia
MRI lower limb patient positioning
Feet first supine / head first supine
Patient over spine coil and body coils over lower leg from knee to ankle joint
Laser beam localiser over middle of lower leg
MRI lower limb axial scan range is __
Position block perpendicular to tibial shaft
MRI lower limb coronal scan range is __
Aligned with right & left tibial shafts
Position block parallel to tibial shaft
B values reflect __
strength & timing of gradients to generate DWI
B values measure __
degree of diffusion weighting applied
- Amplitude
- Time of applied gradients
- Duration between paired gradients
Increasing gradient amplitude & duration & interval widening between paired gradient pulses = ___ B value
higher
