Week 7 Study

What two user controls on video monitors can alter characteristics of displayed images?

• Contrast: determines the range of brilliancies within the displayed image.

• Brightness: determines the brilliance of the displayed image.

• Brightness: determines the range of brilliancies within the displayed image.

• Contrast:

  determines the brilliance of the displayed image.

Answer explanation

Image Explanations on Page 240 in the Edleman Book

_____ which only appear in black and white are high in contrast.

• Brightness
• Bi-stable images

• Scan converters

• attenuating images

Choose the ranking of the image processor order of operations from beginning to end.

• Form signal processor -> Scan converter -> Preprocessor -> Image memory -> postprocessor -> digital to analog converter -> display

• Form signal processor -> Scan converter -> Postprocessor -> Image memory -> preprocessor -> digital to analog converter -> display

• Form signal processor -> digital to analog converter -> Preprocessor -> Image memory -> postprocessor -> scan converter -> display

______ can be described as gray scale imaging that stores information and later displays it.

• Bistable imaging

• Digital Imaging
• Scan Converter

• Analog Imaging

Storage of the image information in the scan converter is called _____. Later image data is ____ from the scan converter for display on the monitor.

• Writing, Read

• Reading, Write

_____ is the process of decreasing the differences between the smallest and the largest echo amplitude to usable range. It is adjustable via dynamic range.

• Compression

• Compensation

• Demodulation

• Reject

______ is the ratio of the largest to the smallest amplitude or power that the system can handle.

• Harmonic distortion
• Frequency response
• Signal-to-noise ratio
• Dynamic range

Compression _______ with more signal sound processed (lowest at display).

• decreases

• increases

The increasing order of the ultrasound system dynamic range consists of:

• Transducer/Amplifier Dynamic Range = 100-120dB

  Signal Processor = 60dB

  Image Processor = 40 dB

  Display = 20 dB

• Transducer/Amplifier Dynamic Range = 20dB

  Signal Processor = 40dB

  Image Processor = 60 dB

  Display = 100-120 dB

• Transducer/Amplifier Dynamic Range = 100-120dB

  Signal Processor = 40dB

  Image Processor = 60 dB

  Display = 20 dB

• Transducer/Amplifier Dynamic Range = 20dB

  Signal Processor = 60dB

  Image Processor = 40 dB

  Display = 100-120 dB

IN compression, the greater value indicates the ability to detect _____ echoes. (greater sensitivity)

• weaker

• stronger