High Resolution and Sensitivity Digital X-Ray Imager for Mammography

摘要

A digital x-ray imager with fill-field screen and high resolution (40 micrometers) was developed. By using commercial, off-the-shelf components to the maximum extent, the production cost of the imager was minimized. A 3x3 array of lens/optical detector modules was fabricated and tested. it is one of the four quarters which make up the fill size imager. CMOS detectors were adapted to this purpose and found to have sufficiently low noise. Electronics, including analog, aid, DSP, and IEEE1394 drivers were developed and tested. Software was developed to allow reconstruction of the fill image (5400x3900 pixel) from the segments. Distortion correction and image segment stitching utilized a calibration pattern. Development of the x-ray light valve continued. A resolution of 10 lp/ mm was demonstrated on x-ray images.