Multiband

Overview sequences

All have 10% gap, fat suppression SPIR offset 175Hz

3mm, TR=600ms, MB4 S1.8, FOV 240x240x132mm, WFS12pix (36mm), PNS moderate. Max dyns/time ???
2.5mm, TR=800ms, MB4 S1.8, FOV 240x240x140mm, WFS 14pix (35mm), PNS moderate. Max time ???
2mm, TR=1400ms, MB3 S2, FOV=224x224x125, (min TR=1337ms), WFS 21 pix (42mm), PNS low, Gradient Mode Maximum, Dyn stabilization Regular. Max ~1100 dyns, 26 min.

Shimming
- Shimbox: inside brain? Is bottomline shimbox wrt OFC / air transition most important?
- What is a good shim?LINEWIDTH checken voor scannen? Log values
- Acquire extra B0-scan as check to avoid large B0-gradient?
- Use Maarten's patch for image based shimming: this patch applies shim to B0-prescan
TR:
- for physiological noise correction, aim for 750ms
- minimal TR: to be adjusted on-scanner (not realistic in VM)
Gradient mode: Set to Enhanced if duty cycle is limiting factor (enormous difference on AMC-wide bore scanner)
Water Fat Shift: minimal. Increase to reduce TR
TE hoeft niet in phase: niet belangrijk voor vet want signaal is al dispersed met deze TE. TE~32.23, 27 is te kort.
Geen slice gap (maar waarom?)
Acquired/Reconstructed Matrix size should match
Multiband factor * SENSE ~= 6
Half scan: no. Unless minimal TR deviates more than 10% from shortest. But: see Gradient mode
Dynamic Stabilization: regular (niet enhanced, kost teveel tijd. Kan ook verstoring geven?)
Offc/Ang: free rotatable Yes
PNS moderate or low
Flip angle --> Ernst angle A typical T1 value for gray matter @ 3T: 1330 ms (Kruger, et al, 2001).
Planning: stevig anguleren. Read-out richting omdraaien AP-->PA?
Equidistant dynamic sampling

Create two SE-EPIs for distortion correction (better unwarping in regions with dropout)