Dr Henry Jefferson, Consultant Anaesthetist
#QuestionFeedback Round 2 - Here are the latest learning points from queries raised by users of Oxford FRCA, both in Discuss and via the app feedback. 1. Ultrasound frequency and penetration Why might a 3 MHz ultrasound probe be selected for imaging deep structures such as the kidneys? The answer is the compromise between PENETRATION and RESOLUTION. Lower-frequency ultrasound undergoes less attenuation, improving penetration into deeper tissues. However, higher-frequency ultrasound provides better spatial resolution.