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Strategies for Transitioning from Analog to Digital Mammography A hybrid viewing environment negatively impacts radiologist efficiency and productivity, partly due to the incompatible optimal luminance and illuminance levels for each. Two possible scenarios for the transition include digitizing film or printing... 顯示更多 Strategies for Transitioning from Analog to Digital Mammography

A hybrid viewing environment negatively impacts radiologist efficiency and productivity, partly due to the incompatible optimal luminance and illuminance levels for each. Two possible scenarios for the transition include digitizing film or printing film from the digital system.

1. Digitizing previous mammograms for comparison on softcopy display:
a. Practical limitations of film digitizers include (1) less accurate digitization of high-optical-density areas on the film, usually greater than 3.5 OD due to low transmitted signals; (2) a small sampling pitch less than 50 microns that produces too large of a data set and may introduce too much film/grain noise, (3) a larger sampling pitch greater than 100 microns that attenuates details in the film by spatial averaging. Film digitizers specifically engineered for mammography film digitization are recommended; they should be used in a manner that provides adequate spatial and contrast resolution for comparison (not primary interpretation) purposes.
b. Digitized film mammograms should have a DICOM Information Object descriptor compatible with dedicated digital mamm-ography workstations.
c. Image appearance should be similar to that of inherently acquired digital mammograms, requiring conversion and contrast enhance-ment algorithms achieved by knowledge of the characteristic response of the film, the acquisition device, and the image processing algorithms.

2. Initially printing film for all digital mammograms and using a lightbox for evaluation and comparison of analog and digital mammograms:
a. Printer should have resolution equal to or better than the corresponding resolution of digital mammograms.
b. Process should continue for at least one year to have a minimum of two digital comparisons.
c. Negative impact on workflow and efficiency should be considered.
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