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Concerning ultrasound scanning modes: a. The returning ultrasound echoes are depicted in the A-mode as a series of dots whose brightness is proportional to the echo amplitude b. Real-time B-mode imaging requires a mechanical sector scanner or an array transducer c. In the M-mode, the echoes are displayed as lines of bright dots on a time line d. ‘Duplex scanning’ refers to simultaneous B-mode and M-mode imaging e. 3D scanning always requires a dedicated 3D probe that is able to steer the ultrasound beam in two orthogonal directions |
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Answer» a. False. They are depicted as vertical lines with an amplitude proportional to the echo strength on a time scale. A series of dots varying in brightness along multiple scan lines is used in B-mode imaging. b. True. c. True. d. False. It refers to simultaneous B-mode and spectral (pulsed-wave) Doppler imaging. e. False. It can also be performed with a 2D probe using a freehand technique. However, the position of the probe needs to be constantly registered, for example using optical or magnetic tracking. |
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