Which device charges vary the brightness of the display and is found in older machines?

Which device charges vary the brightness of the display and is found in older machines?

• A. Analog Scan Converter
• B. Digital Scan Converter
• C. Digital Memory
• D. Analog to Digital Converter

Answer: (A)

Brightness on the display is set by how echo amplitudes are converted into gray levels. In older ultrasound machines, an analog scan converter stored the echo information as an analog voltage that directly drives the display’s brightness. As a result, changing that analog voltage changes how bright the image appears, which is why this device is responsible for display brightness in older systems. Digital scan converters later replaced this with digital data that is converted to brightness, while digital memory holds pixel values and the analog-to-digital converter converts echoes to digital form.

Brightness on the display is set by how echo amplitudes are converted into gray levels. In older ultrasound machines, an analog scan converter stored the echo information as an analog voltage that directly drives the display’s brightness. As a result, changing that analog voltage changes how bright the image appears, which is why this device is responsible for display brightness in older systems. Digital scan converters later replaced this with digital data that is converted to brightness, while digital memory holds pixel values and the analog-to-digital converter converts echoes to digital form.