On 23 Jun, [EMAIL PROTECTED] wrote: >> The minimum realistic requirement for medical work is a high quality >> monitor and a 10-bit DAC. This lets you adjust the output LUT so that >> you can comply with the display standard while using 8-bit data. >> Assuming that there is compliance with the CPI profile, you can degrade >> 10-bit to 8-bit image data with a minimum loss of utility. > > The digital imaging systems that I have been linking to > provide raw 12 and 14 bit grey scale, this is then processed > to provide contrast enhancement so that medical inserts can > easily be seen even with low dosage X-ray monitoring. The > advantage is that only one ADC/DAC pair is required. Colour > is added to the processed image, when a drop to 8 bit can be > accepted. > > The x-ray systems had to be very high resolution 12 bit > before acceptable as a replacement to film in a number of > situations. > Yes, although in all likelihood that requirement was driven by the needs of the acquisition and image processing. I rarely see display situations where the viewing environment permits 12-bit image discrimination. The normal viewing environment is about 10 to 11-bit capable. But, you can often need more precise imaging data to permit proper image processing or to deal with exposure and sensor variations.
I usually deal with 12-bit CR data, and occasionally with 10-bit. In very low exposure imagery you often need the 12-bit capable system so that you get sufficient detail. Then image processing can compensate for exposure and acquisition problems and bring the image into proper range for viewing with more ordinary monitors. General radiography remains the most demanding of the medical imaging applications. The CT, MR, and Ultrasound images are much less demanding. R Horn _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
