Contrast Weighting

Density and Relaxation Are Separate Factors

MRI contrast rows multiply density by cited recovery and transverse factors.

MRI contrast rows multiply density by cited recovery and transverse factors. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Density and relaxation multiply as separate factors

Voxel A uses density 12, recovery fraction 1/2, and echo fraction 5/6 to give signal 5.

12⋅12⋅56=512\cdot\frac{1}{2}\cdot\frac{5}{6}=5
MRI contrast signalA voxel signal is the product of cited density and relaxation factors.signal

A different relaxation row can outweigh the same density

Voxel B keeps the same density 12, recovery fraction 3/4, transverse fraction 2/3, and signal 6.

12⋅34⋅23=612\cdot\frac{3}{4}\cdot\frac{2}{3}=6
MRI contrast signalA voxel signal is the product of cited density and relaxation factors.signal