MRI Scanner Parameters
UCSD Trigeminal Neuralgia Sequence Parameters for Seimens and GE MR Scanners
Seimens 1.5 Vision Scanner
Sequence file name: fi3d_tun_6rb195.xkc
- TR 36
- TE 6
- FLIP ANGLE 20 DEGREES
- # OF SLABS 1
- SLAB THICKNESS 60
- EFF. THICKNESS .86
- DISTANCE FACTOR 0
- ORIENTATION TRANSVERSE
- # OF PARTITIONS 70
- MATRIX 256X256
- REC FOV 6/8
- FOV 220
- # OF ACQ. 1
- # OF MEASURES 1
- PHASE DIRECTION R/L
GE 1.5 Excite Twin Speed Scanner
Pulse Sequence FSPGR
- IMAGING OPTIONS - VBW, FAST, IRPREP, ZIP2
- TR NOT SELECTABLE
- TE MINIMUM
- PREP TIME 450
- FLIP ANGLE 20 DEGREES
- PLANE TRANSVERSE
- # OF SLABS 1
- SLAB LOCATIONS 80
- SLICE THICKNESS .8
- PHASE/FREQUENCY 224/320
- FOV 20
- PHASE FOV .9
- NEX 1
- FREQ. DIRECTION UNSWAPPED
- BAND WIDTH 16.67
- GRADIENT MODE ZOOM
- MODE 3D
Image acquisition outline
- Position patient in head coil as for a routine Brain exam.
- Inject 15 ml of Gadolinium I.V.
- Acquire a standard 3 plane Brain scout sequence.
- Position Trigeminal Sequence with the bottom of the Slab at the base of the Skull. Be sure to adjust for head tilt. This should give you adequate coverage to see the 5 th Cranial Nerve.
- Post Processing can be done in the MPR (multi planar reconstruction) mode specific to the scanner being used. Reconstructing the transverse images in sagittal and coronal planes, will help in evaluating nerve and vessel placement.
