mrimaster

Paranasal Sinuses MRI

Indications for paranasal sinuses (PNS) MRI scan

Contraindications paranasal sinuses (PNS) MRI scan

Patient preparation for paranasal sinuses MRI scan

Positioning for paranasal sinuses MRI scan

MRI paranasal sinus positioning

Recommended PNS Protocols, Parameters, and Planning

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 are T1-weighted low-resolution scans.

T2 tse axial 4mm

Plan the axial slices on the sagittal plane and position the block parallel to the genu and splenium of the corpus callosum. Verify the planning block in the other two planes and ensure that an appropriate angle is maintained in the coronal plane, making it perpendicular to the line of the midline of the brain and the 4th ventricle. Ensure that the number of slices is sufficient to cover the entire brain from the vertex to the line of the foramen magnum.This brain axial is very useful for the evaluation of intracranial extension of sinonasal disease.

mri brain protocol and planning of axial scans

Parameters

TR

3000-4000

TE

100-120

SLICE

4MM

FLIP

130-150

PHASE

R>L

MATRIX

320X320

FOV

210-230

GAP

10%

NEX(AVRAGE)

2

T2 STIR coronal 3mm small FOV

Plan the coronal slices on the sagittal plane; angle the planning block perpendicular to the hard palate. Check the positioning block in the other two planes. An appropriate angle must be given in the axial plane (perpendicular to the nasal septum). Slices must be sufficient to cover the entire sinuses from the tip of the nose to the brain stem.

MRI paranasal sinuses planning of coronal scans

Parameters

TR

4000-5000

TE

110

FLIP

150

NEX

3

SLICE

3 MM

MATRIX

256X256

FOV

160-170

PHASE

R>L

GAP

10%

TI

150

T1 tse coronal 3mm small FOV

Plan the coronal slices on the sagittal plane; angle the planning block perpendicular to the hard palate. Check the planning block in the other two planes. An appropriate angle must be given in the axial plane (perpendicular to the nasal septum). Slices must be sufficient to cover the entire sinuses from the tip of the nose to the brain stem.

MRI paranasal sinuses planning of coronal scans

Parameters

TR

400-600

TE

15-25

SLICE

3 MM

FLIP

140

PHASE

R>L

MATRIX

256X256

FOV

160-170

GAP

10%

NEX(AVRAGE)

2

RESOLVE DWI coronal

Plan the coronal slices on the sagittal plane; angle the planning block perpendicular to the hard palate. Check the planning block in the other two planes. An appropriate angle must be given in the axial plane (perpendicular to the nasal septum). Slices must be sufficient to cover the entire sinuses from the tip of the nose to the brain stem.

MRI paranasal sinuses planning of coronal scans

RESOLVE DWI: RESOLVE is an advanced technique used to obtain high-quality and high-resolution DWI (diffusion-weighted imaging) images, particularly in body regions affected by susceptibility artifacts. It offers sharp imaging with minimal distortions and provides excellent spatial resolution. RESOLVE is especially valuable for evaluating smaller lesions in a wide range of DWI and DTI (diffusion tensor imaging) examinations. By combining RESOLVE with Simultaneous Multi-Slice (SMS) acceleration, acquisition time can be significantly reduced, improving both speed and imaging capabilities. RESOLVE finds application in various clinical fields, including neurology, oncology, and pediatric imaging. Its outstanding balance between imaging speed and quality makes it superior to other diffusion-weighted imaging sequences. Benefits of RESOLVE include high-quality DWI and DTI, reduced susceptibility and blurring artifacts, insensitivity to motion-induced phase errors, lower specific absorption rate (SAR) compared to TSE-based methods, and compatibility with iPAT for faster scans and further reduced distortions.

Parameters

TR

7000-9000

TE

70
115

FLIP

130

NXA

1    2

SLICE

3MM

MATRIX

192X192

FOV

210-230

PHASE

R>L

GAP

10%

B VALUE

0
1000

T2 STIR axial 3mm SFOV

Plan the axial slices on the sagittal plane and angle the planning block parallel to the hard palate. Check the planning block in the other two planes. An appropriate angle must be given in the coronal plane (perpendicular to the nasal septum). The slices must be sufficient to cover the entire sinuses, from the superior border of the frontal sinus down to the level of the lower lip.

Parameters

TR

4000-5000

TE

110

FLIP

150

NEX

3

SLICE

3 MM

MATRIX

256X256

FOV

160-170

PHASE

R>L

GAP

10%

TI

150

T1 tse axial 3mm SFOV

Plan the axial slices on the sagittal plane and angle the planning block parallel to the hard palate. Check the planning block in the other two planes. An appropriate angle must be given in the coronal plane (perpendicular to the nasal septum). The slices must be sufficient to cover the entire sinuses, from the superior border of the frontal sinus down to the level of the lower lip.

Parameters

TR

400-600

TE

15-25

SLICE

3 MM

FLIP

140

PHASE

R>L

MATRIX

256X256

FOV

160-170

GAP

10%

NEX(AVRAGE)

3

T2 tse sagittal 3mm SFOV

Plan the sagittal slices on the axial plane; angle the planning block parallel to the nasal septum. Check the planning block in the other two planes. An appropriate angle must be given in the coronal plane (parallel to the nasal septum). Slices must be sufficient to cover the entire sinuses from right to left.

Parameters

TR

4000-5000

TE

100-120

SLICE

3MM

FLIP

130-150

PHASE

A>P

MATRIX

288X256

FOV

150-170

GAP

10%

NEX(AVRAGE)

2

For contrast enhancement scans

Use T1-weighted sequences (T1 tse DIXON) in both axial and coronal planes after the administration of IV gadolinium DTPA injection (copy the planning outlined above). The document below provides access to the recommended dosage of gadolinium DTPA injection as advised by the manufacturer.