RIU 324 Lecture Notes - Lecture 56: Field Of View
23 Apr 2020
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Amplitude of echo is displayed as the brightness of. X-axis represents depth derived from echo ranging. A stronger signal will produce a brighter dot. Since we normally want more than 1 scan line, we use compound b-scanning. Transducer is moved across patient to produce multiple scan lines. Superimposition of multiple scan lines creates a. A-mode or static b-mode uses a single element transducer and acquires only 1 scan line at a time. In a-mode scanning, the graph is continually updated with current echoes. In b-mode, the previous scan lines must be retained. Store scan lines and convert to display (tv) raster lines. Early systems used bistable display (echoes displayed if > threshold intensity) Subsequent scan lines do not overwrite previous echoes unless the amplitude is greater. Image intensity can be adjusted after all scan lines are converted (after we know the dynamic range. If the display or digital scan converter has only. For a scan depth of 20 cm,
