RIU 324 Lecture Notes - Lecture 54: Image Noise, Grayscale, Sonographer
23 Apr 2020
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Reduced noise by adjusting pixels according to an algorithm that looks at the values of the nearest neighbors, as shown below. The resultant smoothed image is shown on the next slide. By comparison with the image of the previous slide, notice this image is more uniform. In essence, the localized average behavior is used to reduce the variation from pixel to pixel. Summing of frequency images can be adjusted to emphasize: 3-d imaging is now available on many different ultrasound machines. One of the greatest challenges to overcome with. 3-d is creating the means by which to display all three dimensions of data. Many believe that eventually 3-d will replace 2d, just as 2d has replaced a-mode. M-mode is generally used in cardiac imaging and for fetal heart rates. By transmitting repeatedly in the same direction and displaying the grayscale values of each line over time, motion can be discerned as with this mitral valve tracing.
