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Ankle MRI : Protocol and Planning

Indications for ankle MRI scan

Contraindications

Patient preparation ankle MRI scan

Positioning for ankle MRI scan

MRI ankle positioning

Recommended Ankle MRI Protocols and Planning

Ankle MRI localiser

A three-plane localizer must be taken at the beginning to localize and plan the sequences. Localizers are usually less than 25 seconds and consist of T1-weighted, low-resolution scans.

PD tse axial 3 mm

Plan the axial slices on the coronal plane and angle the positioning block parallel to the tibio-talar joint. Check the positioning block in the other two planes. An appropriate angle must be given in the sagittal plane, parallel to the tibio-talar joint. The slices should be sufficient to cover the ankle joint from 2 inches above the tibio-talar joint down to the plantar aspect of the foot. Using saturation bands above the axial block can reduce arterial pulsation artefacts.

Parameters

TR

3000-4000

TE

15-20

SLICE

3 MM

FATSAT

OFF

PHASE

A>P

MATRIX

320X320

FOV

130-150

GAP

10%

NEX(AVRAGE)

2

T2 stir axial 3mm

Plan the axial slices on the coronal plane and angle the positioning block parallel to the tibio-talar joint. Check the positioning block in the other two planes. An appropriate angle must be given in the sagittal plane, parallel to the tibio-talar joint. The slices should be sufficient to cover the ankle joint from 2 inches above the tibio-talar joint down to the plantar aspect of the foot. Using saturation bands above the axial block can reduce arterial pulsation artefacts.

Parameters

 

TR

4000-6000

TE

110

FLIP

150

NEX

2

SLICE

3 MM

MATRIX

256X256

FOV

130-150

PHASE

A>P

GAP

10%

TI

130

T1 tse sagittal 3mm

Plan the sagittal slices on the axial plane and angle the positioning block perpendicular to the line between the medial and lateral malleoli. Check the positioning block in the other two planes. An appropriate angle must be given in the coronal plane, parallel to the tibia. The slices must be sufficient to cover the ankle joint from the outer border of the medial malleolus to the outer border of the lateral malleolus. Using saturation bands above the axial block can reduce arterial pulsation artefacts.

MRI planning and protocol of ankle sagittal

Parameters

TR

400-600

TE

15-25

SLICE

3 MM

FLIP

150

PHASE

A>P

MATRIX

320X320

FOV

150-170

GAP

10%

NEX(AVRAGE)

2

T2 stir sagittal 3mm

Plan the sagittal slices on the axial plane and angle the positioning block perpendicular to the line between the medial and lateral malleoli. Check the positioning block in the other two planes. An appropriate angle must be given in the coronal plane, parallel to the tibia. The slices must be sufficient to cover the ankle joint from the outer border of the medial malleolus to the outer border of the lateral malleolus. Using saturation bands above the axial block can reduce arterial pulsation artefacts.

MRI planning and protocol of ankle sagittal

Parameters

TR

4000-6000

TE

110

FLIP

150

NEX

2

SLICE

3 MM

MATRIX

256X256

FOV

150-170

PHASE

A>P

GAP

10%

TI

150

PD fat saturated coronal 3mm

Plan the coronal slices on the axial plane; angle the positioning block parallel to the line along the medial and lateral malleoli. Check the positioning block in the other two planes. An appropriate angle must be given in the sagittal plane (parallel to the tibia). Slices must be sufficient to cover the ankle joint from the Achilles tendon to the midfoot. Using saturation bands above the axial block can reduce arterial pulsation artefacts.

Parameters

TR

3000-5000

TE

15-20

SLICE

3 MM

FATSAT

ON

PHASE

R>L      H>F

MATRIX

320X320

FOV

150-170

GAP

10%

NEX(AVRAGE)

2