mrimaster

Penile MRI

Indications for penile mri scan

Contraindications for penile mri scan

Patient preparation for penile mri scan

Positioning for penile mri scan

PENILE MRI positioning photo
If the patient agrees, kindly tape the penis to the anterior abdominal wall. This will result in a straightened penis and facilitate easier scan planning. Nevertheless, some patients may decline this positioning method, as it can be uncomfortable for certain staff members. Consequently, we opt to scan the penis in its natural position.

Recommended Penile MRI Protocols, Parameters, and Planning

Penile mri localiser

A three-plane HASTE localizer must be taken initially to localize and plan the sequences. These are fast single-shot localizers with under 25s acquisition time, which are excellent for localizing pelvic structures. Take at least 3-4 slices in all planes to get the best results.

mri penis protocol and planning localiser image

T2 tse sagittal 3mm SFOV

Plan the sagittal slices on the axial plane. Angle the positioning block parallel to the interpubic fibrocartilage and the anal canal (i.e. parallel to the penile base). Check the positioning block in the other two planes. An appropriate angle must be given in the coronal plane (parallel to the penis). Slices must be sufficient to cover the entire penis. The FOV must be big enough to cover the whole penis (normally 180mm-200mm).

Parameters

TR

3000-4000

TE

100-120

SLICE

3 MM

FLIP

130-150

PHASE

A>P

MATRIX

320X320

FOV

270-300

GAP

10%

NEX(AVRAGE)

3

T2 tse coronal 5mm big FOV(For cancer imaging)

Plan the big FOV coronal slices on the axial plane and angle the positioning block parallel to the right and left hip joint. Check the positioning block in the other two planes. An appropriate angle must be given in the sagittal plane (vertically across the abdomen). The slices must be sufficient to cover the entire abdomen and pelvis from anterior to posterior. The FOV must be big enough to cover the abdomen and pelvis, typically ranging from 350mm to 400mm. Big FOV scans are only required for cancer imaging of the penis; there is no need to perform this sequence for penile fracture imaging.

mri penis coronal large FOV abdomen and pelvis planning image

Parameters

TR

4000-5000

TE

100-120

SLICE

5 MM

FLIP

130-150

PHASE

R>L

MATRIX

384X384

FOV

350-400

GAP

10%

NEX(AVRAGE)

2

T2 stir axial 3mm SFOV

Plan the axial slices on the sagittal plane and angle the positioning block parallel to the penile base (i.e., perpendicular to the penile shaft and glans penis). Check the positioning block in the other two planes, ensuring an appropriate angle is given in the coronal plane (perpendicular to the penile shaft and glans penis). The slices must be sufficient to cover the entire penis from the prostate down to 1cm below the glans penis.

Parameters

TR

4000-5000

TE

110

FLIP

130

NEX

4

SLICE

3 MM

MATRIX

256X256

FOV

180-200

PHASE

A>P

GAP

10%

TI

130

T1 tse axial 3mm SFOV

Plan the axial slices on the sagittal plane and angle the positioning block parallel to the penile base (i.e., perpendicular to the penile shaft and glans penis). Check the positioning block in the other two planes, ensuring an appropriate angle is given in the coronal plane (perpendicular to the penile shaft and glans penis). The slices must be sufficient to cover the entire penis from the prostate down to 1cm below the glans penis.

Parameters

TR

400-600

TE

15-25

SLICE

3 MM

FLIP

140

PHASE

A>P

MATRIX

2320X256

FOV

180-200

GAP

10%

NEX(AVRAGE)

3

T2 stir coronal 3mm SFOV

Plan the coronal slices on the sagittal plane and angle the positioning block parallel to the penile shaft and glans penis. Check the positioning block in the other two planes. An appropriate angle must be given in the axial plane (perpendicular to the base of the penis). The slices must be sufficient to cover the entire penis from anterior to posterior.

Parameters

TR

4000-5000

TE

110

FLIP

130

NEX

4

SLICE

3 MM

MATRIX

256X256

FOV

180-200

PHASE

R>L

GAP

10%

TI

150

T1 tse coronal 3mm SFOV

Plan the coronal slices on the sagittal plane and angle the positioning block parallel to the penile shaft and glans penis. Check the positioning block in the other two planes. An appropriate angle must be given in the axial plane (perpendicular to the base of the penis). The slices must be sufficient to cover the entire penis from anterior to posterior.

Parameters

TR

400-600

TE

15-25

SLICE

3 MM

FLIP

140

PHASE

R>L

MATRIX

256X256

FOV

180-200

GAP

10%

NEX(AVRAGE)

4

Penile scans rarely require contrast-enhanced imaging. If contrast-enhanced imaging is necessary, utilize T1 TSE Fat-saturated small FOV axial and coronal scans following the administration of IV gadolinium DTPA injection (using the same planning as outlined above). The document below grants access to the manufacturer’s recommended dosage of gadolinium DTPA injection.