Contrast Weighting

Density and Relaxation Are Separate 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