RIU 324 Lecture Notes - Lecture 55: Frame Rate
23 Apr 2020
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Document Summary
Static imaging has a very limited role in clinical practice but some of the principles are useful in understanding imaging systems. Displays the amplitude of the detected echo on the y-axis. Graphic display of signal level versus depth. Sends out a scan line, or line of sight. The height of the upward deflection is proportional to the amplification of the returning echo. Interfaces farther apart than spl/2 will show as 2 deflections. Interfaces closer together than spl/2 will overlap and combine to 1 deflection. Introduced concept of scan lines and need for prf/ frame rate. A-mode refreshes scan line at the rate of prf since no scan lines are stored. Applied variable gain to correct for attenuation loss. Applied equally to all signals regardless of depth. When overall gain is increased by a factor of, an additional weak signal is displayed.
