Physics
Ultrasound: echoes make an image
Compare time of flight, acoustic reflections and attenuation in a synthetic phantom.
Try this
Remove coupling gel to lose the echo. Raise frequency for sharper shallow detail, then change sound speed to reveal a depth error. The animated outgoing and returning wavefronts are slowed for display.
The model and its limits
Prescribed two-dimensional phantom with pulse envelopes, impedance reflections and attenuation. Speckle is illustrative; no wave-equation solver or clinical image interpretation.
Equations used in the module
Equations d = c t / 2 r = (Z_2-Z_1)/(Z_2+Z_1)
