mrimaster

LOWER LEg

Indications mri lower leg (tibia and fibula)

Contraindications

Patient preparation

Positioning

MRI positioning of legs

Suggested sequence, parameters and planning

localiser

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

T2 stir coronal 4mm 460 FOV

Plan the coronal slices on the sagittal plane and angle the positioning block parallel to the tibial shaft. Verify the positioning block in the other two planes. Ensure an appropriate angle is set in the axial plane, aligned with the right and left shafts of the tibia. The slices should adequately cover the entire lower leg from anterior to posterior. The field of view (FOV) should be large enough to encompass both the knee joint and ankle joint (typically ranging from 450mm to 480mm).

Parameters

TR

4000-5000

TE

110

FLIP

160

NEX

2

SLICE

3 MM

MATRIX

448X384

FOV

450-480

PHASE

R>L

GAP

10%

TI

150

T1 tse coronal 4mm 460 FOV

Plan the coronal slices on the sagittal plane and angle the positioning block parallel to the tibial shaft. Verify the positioning block in the other two planes. Ensure an appropriate angle is set in the axial plane, aligned with the right and left shafts of the tibia. The slices should adequately cover the entire lower leg from anterior to posterior. The field of view (FOV) should be large enough to encompass both the knee joint and ankle joint (typically ranging from 450mm to 480mm).

Parameters

TR

400-600

TE

15-25

SLICE

3 MM

FLIP

160

PHASE

A>P

MATRIX

448X448

FOV

450-480

GAP

10%

NEX(AVRAGE)

2

T1 tse axial 6mm

Plan the axial slices on the sagittal plane and angle the positioning block perpendicular to the shaft of the tibia. Verify the positioning block in the other two planes. An appropriate angle should be applied in the coronal plane, perpendicular to the right and left shaft of the tibia. Ensure that the slices cover the entire lower leg from the knee joint down to the ankle joint. In case the pathology is localized in one area, perform axial slices only in that specific region.

Parameters

TR

400-600

TE

15-25

SLICE

6MM

FLIP

160

PHASE

A>P

MATRIX

512X448

FOV

350-400

GAP

10%

NEX(AVRAGE)

2

T2 stir axial 6mm

Plan the axial slices on the sagittal plane and angle the positioning block perpendicular to the shaft of the tibia. Verify the positioning block in the other two planes. An appropriate angle should be applied in the coronal plane, perpendicular to the right and left shaft of the tibia. Ensure that the slices cover the entire lower leg from the knee joint down to the ankle joint. In case the pathology is localized in one area, perform axial slices only in that specific region.

Parameters

TR

3000-4000

TE

110

FLIP

160

NEX

2

SLICE

6MM

MATRIX

448X384

FOV

350-400

PHASE

A>P

GAP

10%

TI

150

T2 tse sagittal 3mm right

Plan the right-side sagittal slices on the coronal plane and angle the positioning block parallel to the shaft of the right tibia. An appropriate angle must be given in the axial plane (vertically across the tibia). Slices must be sufficient to cover the right lower leg from medial to lateral. The field of view (FOV) must be big enough to cover the knee joint and ankle joint (normally 450mm to 480mm).

Parameters

TR

4000-5000

TE

100

SLICE

3 MM

FLIP

160

PHASE

A>P

MATRIX

512X448

FOV

450-480

GAP

10%

NEX(AVRAGE)

2

T2 tse sagittal 3mm left

Plan the left-side sagittal slices on the coronal plane and angle the positioning block parallel to the shaft of the left tibia. An appropriate angle must be given in the axial plane (vertically across the tibia). Slices must be sufficient to cover the left lower leg from medial to lateral. The field of view (FOV) must be big enough to cover the knee joint and ankle joint (normally 450mm to 480mm).

Parameters

TR

4000-5000

TE

100

SLICE

3 MM

FLIP

160

PHASE

A>P

MATRIX

512X448

FOV

450-480

GAP

10%

NEX(AVRAGE)

2