ÉDU Flashcards
Définitions et langage
Ultrasound (US)—sound waves with frequencies >20,000 Hz. Modern diagnostic US typically operates in the 1- to 18-MHz range
Window—soft tissue where transducer is placed to interrogate tissue in the body
B-mode or brightness mode (greyscale or two-dimensional)—graphs the amplitude of reflected US waves as shades of gray from black to white on a monitor screen
Gain—adjusts the amplitude of signals on the ultrasound display (brightness)
Time-gain compensation (TGC)—changes gain at specific depths
M-mode (motion mode)—displays reflected waves over time and distance; used to calculate rates (eg, fetal heart rate) and evaluate moving structures (eg, cardiac valves)
Color flow Doppler—displays direction and velocity of flow
Power Doppler (power angiography)—displays velocity of flow, but not direction
Pulsed wave Doppler—demonstrates velocity and direction of flow in a waveform display
Focus—image area where US beam is narrowest and lateral resolution is greatest
Near-field—area on display from transducer to focus
Far field—area on display from focus to the bottom of the display
Anechoic—without sounds (black)
Echogenic—with sounds (white)
Hyperechoic—with more reflected sounds than adjacent tissue (more echogenic)
Hypoechoic—with less sound than adjacent tissue (less echogenic)
Taux de grossesse hétérotopique
1/5000 mais ad 1-3/100 avec tx fertilité
