TABLE I.
Comparison between AS-PAM, FD-PAM and TD-PAM
| Simulated data1 | ||||||
|---|---|---|---|---|---|---|
|
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| Back-propagation method | Bandwidth (# Frequency bins) | Runtime (Sec) | FWHM (Axial) | FWHM (Transverse) | SBNR (Low noise) | SBNR (High noise) |
| TD-PAM | 21.7×l03kHz | 40.2±0.2 | 4.1 | 0.92 | 474 | 13±1 |
| FD-PAM | 24.3 kHz (#1) | 0.06±0.002 | 4.0 | 0.87 | 229 | 16±7 |
| FD-PAM | 1215 kHz (#50) | 2.2±0.09 | 4.2 | 0.93 | 317 | 37±7 |
| AS-PAM | 24.3 kHz (#1) | 0.03±0.001 | 4.2 | 1.09 | 546 | 18±2 |
| AS-PAM | 1215 kHz (#50) | 0.20±0.01 | 4.3 | 1.11 | 740 | 42±13 |
|
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| Experimental data2 | ||||||
|
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| Back-propagation method | Bandwidth(# Frequency bins) | Runtime (Sec) | FWHM (Axial) | FWHM (Transverse) | Peak location | SBNR>10 (# images) |
|
| ||||||
| TD-PAM | 6.42 MHz | 44.5±0.6 | 18.8±5.9 (med: 17.4) | 1.9±0.4 (med: 1.8) | 120.5±2. (med: 120.5)7 | 26±16.8 (#106/780) |
| FD-PAM | 3 MHz (#480) | 10.8±0.4 | 21.1±8.4 (med: 18.5) | 1.9±0.5 (med: 1.8) | 120.5±2.6 (med: 120.8) | 28±19 (# 112/780) |
| AS-PAM | 3 MHz (#480) | 1.77±0.03 | 24.2±6.2 (med: 22.1) | 2.5±1.2 (med: 2.1) | 123.7±4.9 (med: 124.8) | 29.5±20 (#118/780) |
1
# of data points: 1790; image dimensions: 128×128 (TD-PAM & FD-PAM), 512×128 (AS-PAM); distance from Array: 34 mm.
2
# of data points: 2048; image dimensions: 64×128 (TD-PAM & FD-PAM), 512×128 (AS-PAM); distance from Array: 120 mm.
FWHM and Peak location are expressed in mm. The FWHM was estimated by data-fit of the line profiles.