3T Multiband: Difference between revisions
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Created page with "= Multiband = == Sequence-parameters == * Shimmen ** Shimbox: inside brain? Is bottomline shimbox wrt OFC / air transition most important? ** What is a good shim?LINEWIDTH ch..." |
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== Sequence-parameters == | == Sequence-parameters == | ||
* | * Shimming | ||
** Shimbox: inside brain? Is bottomline shimbox wrt OFC / air transition most important? | ** Shimbox: inside brain? Is bottomline shimbox wrt OFC / air transition most important? | ||
** What is a good shim?LINEWIDTH checken voor scannen? Log values | ** What is a good shim?LINEWIDTH checken voor scannen? Log values | ||
** Acquire extra B0-scan as check to avoid large B0-gradient? | ** Acquire extra B0-scan as check to avoid large B0-gradient? | ||
* 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) | * Gradient mode: Set to Enhanced if duty cycle is limiting factor (enormous difference on AMC-wide bore scanner) | ||
* TE hoeft niet in phase: niet belangrijk voor vet want signaal is al dispersed met deze TE. TE~32.23, 27 is te kort. | * 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?) | * Geen slice gap (maar waarom?) | ||
| Line 20: | Line 22: | ||
* Flip angle --> Ernst angle | * Flip angle --> Ernst angle | ||
* Planning: stevig anguleren. Read-out richting omdraaien AP-->PA? | * Planning: stevig anguleren. Read-out richting omdraaien AP-->PA? | ||
== Data-export == | |||
* enhanced dicom does not work for >16k images | |||
* export nifti | |||
* export PAR/REC or XML/REC to store sequence parameters | |||
Revision as of 09:44, 15 December 2017
Multiband
Sequence-parameters
- 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?
- 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)
- 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
- Water Fat Shift: minimal
- Dynamic Stabilization: regular (niet enhanced, kost teveel tijd)
- Offc/Ang: free rotatable Yes
- PNS moderate
- Flip angle --> Ernst angle
- Planning: stevig anguleren. Read-out richting omdraaien AP-->PA?
Data-export
- enhanced dicom does not work for >16k images
- export nifti
- export PAR/REC or XML/REC to store sequence parameters