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Bush__The_Essential_Physics_for_Medical_Imaging - Biomedical ...

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FIGURE 4-10. Effect of number of bits per pixel on image quality-digital chest image in <strong>for</strong>matsof 8, 3, 2, and 1 bits per pixel (A, B, C, and D, respectively). Too few bits per pixel not only causesloss of contrast resolution, but also creates the appearance of false contours.<strong>The</strong> total number of bytes required to store an image is the number of pixels inthe image multiplied by the number of bytes per pixel. For example, the number ofkilobytes required to store a 512-by- 512 pixel image, if one byte is used per pixel, is(512 X 512 pixels) (l byte/pixel)/(l,024 bytes/kB) = 256 kB.Similarly, the number of 64-by-64 images that may be stored on a 1.4-megabyte floppy disk, if 16 bits are used per pixel, is

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