Post-processing occurs at which point in the imaging workflow?

Post-processing occurs at which point in the imaging workflow?

• A. is played off of the VCR
• B. entered the A/D converter but before display
• C. after it leaves the A/D converter
• D. after it leaves the scan converter

Answer: (C)

Post-processing is digital image processing applied to the echoes after they have been converted to digital form. The transducer's analog signal is first amplified and filtered, then turned into digital values by the A/D converter. Only after this digitization can algorithms like contrast adjustments, filtering, and edge enhancement be applied to improve the image. These digital operations occur before the data are mapped to the display grid by the scan converter, which is why post-processing is described as happening after the data leaves the A/D converter. Processing the signal in analog form or after scan conversion wouldn’t provide the same precise, flexible digital enhancements.

Post-processing is digital image processing applied to the echoes after they have been converted to digital form. The transducer's analog signal is first amplified and filtered, then turned into digital values by the A/D converter. Only after this digitization can algorithms like contrast adjustments, filtering, and edge enhancement be applied to improve the image. These digital operations occur before the data are mapped to the display grid by the scan converter, which is why post-processing is described as happening after the data leaves the A/D converter. Processing the signal in analog form or after scan conversion wouldn’t provide the same precise, flexible digital enhancements.