the.com/ultrasound
sound so high you can't hear it, drawing pictures of the unborn and the unseen
means Sound at frequencies above the range of human hearing (above about 20,000 Hz), used to image the body, clean objects, and measure distances by bouncing echoes.
from From Latin 'ultra,' meaning 'beyond,' bolted onto plain English 'sound' — literally 'beyond sound,' a 20th-century coinage for the pitches that lie past the ceiling of our ears. The 'ultra-' prefix is the same one lurking in 'ultraviolet,' another wave we can't sense but can put to work.
- frequency
- Above 20,000 Hz, past human hearing limits
- bat tech
- Bats echolocated this way millions of years first
- flaw finder
- Used to spot cracks deep inside steel
- cleaning power
- Ultrasonic baths scrub jewelry with collapsing bubbles
- sonic surgery
- Focused beams can destroy tumors without cutting skin
alara principle — medical guideline limiting ultrasound exposure to as low as reasonably achievable, established by fda and who
fetal anomaly scan — 20-week pregnancy ultrasound screening, standard in uk nhs and most developed healthcare systems since 1990s
echocardiography — cardiac ultrasound using doppler effect, gold standard for detecting heart valve disease and chamber function