Pituitary MRI Protocol



Plain Study Protocol includes:
  • SCOUT Three plane low resolution scouts
  • T2_CORONAL TurboSE T2 coronals positioned through the sella or lesion.Place the rear slice through the Basilar artery.
  • Sagittal and Coronal T1-W spin-echo (3-mm slices)
Pituitary with contrast enhancement (3-mm slices)
  • Isotropic_MPRAGE- Used for multi-planar reformatting.
  • Post Contrast- Sagittal T1-W spin-echo
  • Post Contrast-Coronal T1-W FAT SAT 
  • Post Contrast Axial whole brain 
Optional Sequences
PD+T2_BRAIN 
Sequence copied form the Standard brain examination for a general overview of the brain in patients with a non specific indication for Pituitary MRI
T2_SAGITTAL
For enhanced display of cystic lesions if they are not clearly visible on the MP RAGE images

Multi-planar Reconstructions
For more detailed instructions see "Creating & Filming MPRs for Pituitary Examinations"
  • Create 12 sagittal and 12 coronal T1 weighted images.
  • Slice Thickness 1 or 2 mm for micro-adenomas, 3 mm or 4 mm for macro-adenomas.
  • Use Double Oblique prescription on an axial work image to ensure that the planes are anatomically true.
  • Define the sagittal locations from the right to the left, and the coronals from posterior to anterior to ensure easy filming in the proper direction.

Dynamic Contrast Pituitary 

To identify small (>3mm) secreting pituitary adenomas so that a partial resection of the pituitary may be used rather than total.

Preparation & Kit
  • 20G Jelco
  • 10 ml Saline
  • Minimum volume extension tube
  • Tape and tourniquet
  • 2 x 10 ml syringes
Set up the jelco with the extension tube filled with saline. The contrast is injected rapidly (2 ml/sec) at the beginning of the second scan, and followed by a saline flush of 5-10 mls.

Contrast Doses (Half dose) Dynamic Contrast Pituitary 

40 kg
4 mls
80 kg
8 mls
50 kg
5 mls
90 kg
9 mls
60 kg
6 mls
100 kg
10 mls
70 kg
7 mls
110 kg 
11 mls

TECHNIQUE
Perform a standard plain pituitary exam first unless done recently.
Rapid_T1_Coronal_51297
This is a series of TSE T1 coronal images intended to be used with a fast injection of half dose contrast. The injection is rapidly given at the start of the 2nd measurement. There is a 10 second pause between the first (precontrast) scan and the start of the continuous string of post contrast measurements to prepare the injector and give a countdown.

Pituitary M Time curve analysis

Perform this analysis for each slice covering the gland. 
Review the images sequentially for any subjective appearance of delayed enhancement.
  • Select Evaluate Mean/Curve
  • On the 3rd post contrast view, set up 4 adjacent circular ROIs that cover the pituitary gland from right to left. Enter the appropriate image image numbers to make a set of enhancement curves.
This is a series of TSE T1 coronal images intended to be used with a fast injection of half dose contrast. The injection is rapidly given at the start of the 2nd measurement. There is a 10 second pause between the first (precontrast) scan and the start of the continuous string of post contrast measurements to prepare the injector and give a countdown.

No comments:

Related Posts Plugin for WordPress, Blogger...

Popular Posts

There was an error in this gadget