| Specifications | WhitePaper_Calibration Medical Imaging_2010_03_12:Canvys Sales Sheet.qxd altunel |
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| Specifications | WhitePaper_Calibration Medical Imaging_2010_03_12:Canvys Sales Sheet.qxd altunel |
| Business section |
| Specifications | WhitePaper_Calibration Medical Imaging_2010_03_12:Canvys Sales Sheet.qxd altunel |
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| Content | A Division of Richardson Electronics | www.canvys.com| 888.735.7373 Why is the Topic of Calibration Important? Calibration of a soft-copy viewing station is an important component of effective medical imaging. — The calibration precision required is a func- tion of several considerations (modality, type of anatomy being imaged, diagnostic or clinical use, etc.). — In many cases, there are very small luminance differences between an area of interest (which itself may be very small) and the surrounding area. Without proper attention to display system calibration (as well as the resolution), it is possible that the viewing workstation itself can adversely affect the ability to make a proper diagnosis or interpretation of the image being displayed. For example, if one used an uncalibrated commercial color monitor, the low-level shades of gray may be particularly hard to distinguish from one another. Clearly, it is unacceptable to have a diagnosis be compromised depending on which viewing station is used to view the image. With the calibration tools available today for medical grade viewing stations, this compromise can be avoided. Guidelines Given the importance of properly displaying medical images, there have been several guidelines that have been developed around the topic of calibration. — When the American College of Radiology (ACR) and National Electrical Manu - facturers Association (NEMA) formed a joint committee to develop a Standard for Digital Imaging and Communications in Medicine (DICOM), they reserved Part 14 for the Grayscale Standard Display Function. This standard defines a way to take the existing Characteristic Curve of a display system (i.e. the relationship between the Luminance Output for each Digital Driving Level or pixel value) and modify it to the Grayscale Standard Display Function. At the heart of the Grayscale Standard Display Function is the Barten Model. This model takes into account the perceptivity of the human eye. Given the black and white levels of the display system, it will spread out the luminance at each of the intermediary Digital Driving Levels such as to maximize the Just Noticeable Differences between each level. The bottom line is that after calibration, each Digital Driving Level will Calibration Medical Imaging By David Sorensen, Canvys - Visual Technology Solutions 2 White Paper |
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