The availability of high-frequency probes
(up to 20 MHz) on common internal ultrasound equipment has led to an ever
more widespread application of the method to the study of dermatological
conditions, whether diffuse or focal.
The probes are of two main types: the
electronic linear variety, with a frequency range of 7.5 -10 - 13 MHz,
equipped with Doppler color-power, and the 20 MHz monocrystal mechanical
kind with annular scanning, without the Doppler module.
Sonography's role in dermatology may be
schematized into three main applications:
1) the staging of, and follow-up checks
on, tumors;
2) follow-up checks on diffuse conditions
and treatment monitoring;
3) defining the diagnosis in skin and
subcutaneous abnormalities.