Methods¶

Every model qmrust fits, grouped by method family. Each page documents what the model reads, what it produces, and how to run it with and without BIDS.

T1 Relaxometry¶

Inversion Recovery

Fits the longitudinal relaxation time T1 from a series of inversion-recovery images acquired at different inversion times.

IRT1 · T1map

Variable Flip Angle

Fits the longitudinal relaxation time T1 from spoiled gradient-echo images acquired at two or more excitation flip angles and a single repetition time.

VFA · T1map, M0map

T2 Relaxometry¶

Monoexp T2

Fits the transverse relaxation time T2 from a multi-echo spin-echo series as a mono-exponential decay with a free amplitude.

MESE · T2map, M0map

Field Mapping¶

Actual Flip Angle B1+

Maps the transmit (B1+) field from a single spoiled gradient-echo sequence that interleaves two excitation repetition times at one nominal flip angle.

TB1AFI · TB1map

Double Angle B1+

Maps the transmit (B1+) field from two spoiled gradient-echo volumes acquired at flip angles alpha and twice alpha.

TB1DAM · TB1map

Magnetization Transfer¶

Semi-quantitative MT¶

MT Ratio

Computes the magnetization transfer ratio from two images: one acquired with an off-resonance saturation pulse and one without.

MTR · MTRmap

MT Saturation

Derives the MT saturation parameter from three spoiled gradient-echo volumes — MT-weighted, PD-weighted and T1-weighted.

MTS · MTsat, T1map, MTRmap

Quantitative MT¶

qMT-SPGR

Two-pool quantitative magnetization transfer from a spoiled gradient-echo sequence with off-resonance saturation sampled across a grid of saturation flip angles and frequency offsets.

QMTSPGR · Fmap, kRmap, R1Fmap, R1Rmap, T2Fmap, T2Rmap