Читать книгу The Physics and Technology of Diagnostic Ultrasound: A Practitioner's Guide - Robert Gill - Страница 21

1 Observe which probes are used for different types of examination in your workplace. Notice whether there is a trend to use higher frequencies for more superficial areas.

2 Suppose a given ultrasound machine has a maximum depth of penetration of 20 cm when operating at 4 MHz. Calculate the penetration you would expect at frequencies of 2.5, 3, 5, 7.5, 10 and 15 MHz. Put the results into a table and think about typical clinical applications where you could use each of these frequencies.