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Guide to Medical

Dentist's Guide to Medical Conditions and Complica

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Brain and Skull suite

Thursday, April 14, 2011 , Posted by mohamed at 11:05 PM

Sequence 2 axial (orientation, slice thickness, and slice gap as sequence 1)
T1-weighted
Example
SE:
— TR = 450–600
— TE = 12–25
3-D FFE:
— TR as short as possible
— TE = 4–5 (1.5 T), 6.9 (1.0 T), 10–12
(0.5 T)
Flip angle 30–70°
or
Proton-density-weighted
Example
— TR = 2000–3500
— TE = 15
— Slice thickness: 5–6mm
— Slice gap: 20% of slice thickness (!1–1.2mm or factor 1.2)
or
Sequences 1 and 2 as double echo (T2/proton-density-weighted) axial
(orientation, slice thickness, and slice gap as sequence 1)
Example
— TR = 3000–4500
— TE = 15/100
ca. 10 mm
50 – 80 mm
Neurocranium, axial,
sequences 1 and 2
Brain and Skull
Moeller, MRI Parameters and Positioning © 2003 Thieme
All rights reserved. Usage subject to terms and conditions of license.
4
Sequence 3 coronal (orthogonal to sequence 1)
FLAIR
Example
Dark fluid:
1.5 T
— TR = 9000
— TE = 120
— TI = 2300
1.0 or 0.5 T
— TR = 5000
— TE =100
— TI = 1900
— Slice thickness: 6mm
— Slice gap: 20% of slice thickness (! 1.2mm or factor 1.2)
— Saturation slab: orthogonal to the slices (axial superior to the neck)

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