Digital-to-Analog conversion occurs at which point in the imaging chain?

Digital-to-Analog conversion occurs at which point in the imaging chain?

• A. Between transducer and receiver
• B. Between beam former and transducer
• C. Between scan converter and display
• D. Between receiver and scan converter

Answer: (C)

Digital-to-Analog conversion happens where the digital image data from the scan converter is turned into an analog video signal to drive the display. In modern ultrasound systems, the scan converter holds and formats the image as digital pixel data; the display hardware (CRT or LCD) typically expects an analog video input, so a digital-to-analog converter sits between the scan converter and the display to convert those digital pixel values into the voltage levels that create the image on screen. Writing the signal path earlier, such as between the transducer and receiver or between the beam former and transducer, would be dealing with actual pulse signals or early analog paths, not the final step that prepares image data for viewing. Similarly, placing the DAC between the receiver and the scan converter would imply converting analog-to-digital data, which is the opposite direction.

Digital-to-Analog conversion happens where the digital image data from the scan converter is turned into an analog video signal to drive the display. In modern ultrasound systems, the scan converter holds and formats the image as digital pixel data; the display hardware (CRT or LCD) typically expects an analog video input, so a digital-to-analog converter sits between the scan converter and the display to convert those digital pixel values into the voltage levels that create the image on screen. Writing the signal path earlier, such as between the transducer and receiver or between the beam former and transducer, would be dealing with actual pulse signals or early analog paths, not the final step that prepares image data for viewing. Similarly, placing the DAC between the receiver and the scan converter would imply converting analog-to-digital data, which is the opposite direction.