Longer Echo Time Loses More Visible Signal - Biophysical Instrumentation VII: NMR Relaxation and MRI Contrast Step by Step

The toy contrast comes from checked coherent fractions. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

A shorter wait keeps 9 visible

With the same initial 12, one checked row keeps 9 coherent.

9/12=\frac{3}{4}

A longer toy wait keeps only 6 visible

The contrast row has coherent 6 and dephased 6, so the visible signal drops to 6.

6/12=\frac{1}{2}