Range Gate Boundary Three-Row Scan - Biophysical Ultrasound: Echo Timing and Acoustic Interfaces Step by Step

The same echo depth can pass or fail different accepted intervals.

The same echo depth can pass or fail different accepted intervals. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Gate row 1 has accepted bit 1

The echo depth stays 12. Gate low 0 and high 20 give accepted bit 1.

0\le12\le20\quad b=1

Gate row 2 has accepted bit 1

The echo depth stays 12. Gate low 10 and high 14 give accepted bit 1.

10\le12\le14\quad b=1

Gate row 3 has accepted bit 0

The echo depth stays 12. Gate low 13 and high 20 give accepted bit 0.

13\le12\le20\quad b=0

The same echo can pass or fail different gates

The path and depth do not change. Only the accepted interval changes, so the third row rejects the same twelve-meter depth.

\begin{array}{c|c|c|c}d&g_{\min}&g_{\max}&b\\12&0&20&1\\12&10&14&1\\12&13&20&0\\\end{array}