verywellhealth6 天
What Does a Pancreatic Ultrasound Diagnose?
A pancreas ultrasound involves different technologies to help diagnose cysts, precancerous changes, and tumors. Learn about ...
BBC1 年
Sound and ultrasound - Edexcel
Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing – above 20,000 Hertz (Hz). Different ...
BBC4 年
Sound waves - AQA Ultrasound
Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing - above 20,000 Hertz (Hz). Different species ...