This section addresses some frequently asked questions regarding acquisition protocols and how to set them in qMRLab.
You can visit our MP2RAGE blog post to find out about
the basics of the
This section of the
Protocol panel expects two
In the original implementation, the
NumberOfShots is referred as
before/after designates the number of segments
before and after the center of k-space.
To calculate these values, you need to know the values of
Slices Per Slab (NSlices) and
Slice Partial Fourier
(PF) parameters. To calculate
Pre = NSlices(PF - 0.5)
Post = NSlices/2
- Inversion (Inv)
DICOM) between two inversion pulses in seconds. In the (Siemens)
TRunder the Contrast - Common section. In BIDS, this corresponds to the
RepetitionTimePreparationmetadata field. Typically between 3 - 6 seconds.
- Excitation (Inv)
- The repetition time between two excitation pulses in each GRE readout block. In the (Siemens)
Echo spacing(usually) under the Sequence - Part 1 section. In BIDS, this corresponds to the
RepetitionTimeExcitationmetadata field. Typically around 0.006 - 0.008 seconds.
Some parameters are not included in the
DICOM header by Siemens, such as the
RepetitionTimeExcitation. Nonetheless, can be accessed in the protocols exported as
Inversion times belonging to each GRE readout block. In the (Siemens) protocol
TI 1 and
Excitation flip angles in each GRE readout block. In the (Siemens) protocol
Flip angle 1
Flip angle 2.