Ultrasound Modes Questions and Answers 2023

Ultrasound Modes Questions and Answers 2023 B-mode (Brightness mode) 1. Information displayed as a 2-dimensional map 2. Grey-scale used to show corresponding echo amplitude 3. Ultrasound beam is steered through the patient and data is collected along each line of sight using the pulse-echo principle 4. Allows rapid data acquisition providing real-time images of moving structures Motion Mode 1. Primarily used for cardiac imaging 2. Represents depth (time delay) vs time 3. Different echo amplitudes represented by variations in brightness on display 4. Displays the echoes returning from one line in the B-mode axis A-mode 1. Developed by Karl Dussik in the 1940s 2. Displays amplitude vs depth (time delay) Provides information on: 4. Distance of echo from transducer 5. Amplitude of echo 6. One-dimensional information only 7. Used for echoencephalography and echoophthalmoscopy Bi-stable display 1. A 2-dimensional image displayed in black and white 2. Douglass Howry and Joseph Holmes produce a 2-D compound scanner and then the bistable display in the 1940s Grey Scaling Developed in 1969 by Kossoff and his team at Ultrasonic Institute (in Sydney) Doppler US 1. Uses the Doppler shift (change in sound frequency as particles move towards or away from a transducer) discovered in 1842 2. Allows us to examine the characteristics of direction and speed of blood flow in particular 3. Several types including: Colour Doppler, Power Doppler & Spectral Doppler Colour Doppler 1. Provides direction of flow and relative velocity information 2. Always used in conjunction with B-mode Power Doppler 1. Detects the presence of a Doppler shift (and therefore the presence of flow) only 2. Does not provide direction or flow velocity information 3. Higher sensitivity to lower flow Spectral Doppler 1. Used in combination with B-mode and Colour Doppler imaging 2. Provides quantitative velocity information, through interrogation of a small sample volume