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Digital vs. Analog Mammography

ced by the scintillators, are then digitized to produce an image. One major problem with the images is that they can only be 5 x 5 cm, much smaller than the typical breast.

The flat-panel arrays, another indirect system, involves the detection of light by a series of smaller (100m) photo diodes arrayed over a flat panel measuring 19 x 23 cm. The special resolution is 100 m, with a similar resolution to CCD. It can be used to cover the entire breast.

The computed radiography cassette, utilizes laser beam scanning to de-energize the plate, resulting in light that is detected by a photomultiplier tube and then produces a digital image. It produces a special resolution of 50 m.

Digital mammography also has an intrinsically wider dynamic range, displaying all breast structures from dense parenchyma to skin. Because there is a lower level of intrinsic noise, a lower dose of x-ray may be used than is currently used in conventional mammography with no loss in accuracy. The imaging process can also be used to create display "windows" for masses and calcifications.

The soft copy display provides a direct-view display of the digital image on cathode ray tube (CRT) monitors or liquid crystal display (LCD), allowing for unlimited manipulation of the contrast and brightness of the image, including image reversal and electronic magnification.

Studies find several advantages to digital mammography systems, including:

  • A higher detected quantum efficiency (DQE), especially near the skin line and in dense breasts, providing better detection and diagnostic capabilities at a lower radiation level.2 One reason for the improved detection is that digital mammography can distinguish more shades of gray than film mammography.
  • The capability to acquire images in near-real time and to process them, i.e., to vary brightness and contrast levels, auto-windowing, image manipulation. Information can also be coupled with patient information
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