Display in the digital imaging system for medical role and matching – medical, d
As the IT industry, maturing soon into the field of medical radiation. Because of its "soft reading of film functions" and forward-looking, more and more popular domestic hospitals, various medical digital imaging systems have been classified among the hospital purchase plan. However, because of cost considerations, the digital imaging system configuration in the display, it is often ignored or discarded medical monitor configuration to an ordinary PC monitor or black and white display alternative to digital imaging system, image display greatly reduced, and has become the current the development of a digital imaging "bottleneck."
Present, many domestic manufacturers, integrators of digital X machine, CR, DR systems and PACS systems investment allocation ratio, matching the display parameters and lower investment ratio, displaying the natural relatively low, leading to China the overall function of digital imaging system a "bucket effect", that is, the lowest parts of the overall system function = function, this phenomenon was the result of medical monitors domestic industry caused by lack of knowledge. Radiation circle in order to make the diagnostic accuracy of digital imaging systems have a full understanding problems, understanding of medical monitors in Digital Imaging in effect, we monitor several aspects from the medical discussion.
Medical display parameters: 1, light gray eyes on the ability to distinguish the difference with the brightness, with a nonlinear relationship. Figure, the brightness (Luminance) the higher the human eye can distinguish the gray (JND-JustNoticeableDifference) the more. Conversely, low brightness, poor eye on the gray scale resolution. Higher brightness, the human eye can distinguish between the gray scale on more. In order to improve the grayscale resolution, will require high brightness display. Brightness (Luminance) the higher the human eye can distinguish between the gray level (JND? Just NoticeableDifference) have more. Medical film-reading room of the ambient light brightness of the display is influential, the brightest part of the display image depending on display brightness, but the dark part of the addition to the display brightness, display with ambient light and the refractive index of the.
If the indoor illumination 100lux, the display reflects the 2%, then the brightness of 2cd/M2. When asked to contrast ratio of 1:100, the display brightness should be at least 200cd/M2 (general office of illumination can often achieve 500lux, display brightness on the requirements to achieve 1000cd/M2) such as the human eye to distinguish non-linear grayscale capacity and environmental illumination factors.
Design and manufacture of medical displays the maximum brightness of 800-600cd/M2. Ordinary display brightness 200-350cd/M2. American College of Radiology (ACR) provides digital X-ray images of maximum brightness should be at least as 170cd/M2. 2001 3 month in Germany to discuss X-ray image at the industry view is that all digital images with the brightness of the display requirements of at least 200cd/M2. General perspective or CT Images of at least 100cd/M2. Then the view of this, normal display brightness seems to have reached the required brightness of film-reading (many hospitals have just installed the display image is also quite satisfactory). CRT or LCD monitors into account, the brightness will decay over time.
We hope that at least three years, the display brightness can be maintained at or above the minimum requirements of the brightness, so the brightness of the proposed new monitor should be at least more than in the 500cd/M2. However, because there is no ordinary monitor the stability and brightness correction, brightness decays with time and the reflection of ambient light, display brightness greatly discount, can not really read the piece demands (on the brightness issue, even within the stability in detail later) The medical monitor of the highest brightness in the installation in place, use of optical correction means for correction according to DICOM standards, so keep the light requirements of a film-reading brightness values. (Generally between 400-500cd/M2), and to ensure constant in the 3-5 million hours. This ensures the stability and brightness of image consistency. From this, general medical display monitors and access to film in medical radiology room under the actual function of the working environment is very different.
2, gray eyes on the gray scale response is not linear relationship. Our eyes to the bright and dark parts as part of the response sensitivity. DICOM 3.0 grayscale images for display XIV provides a standard display function (Figure 5). Using this standard display function in the different brightness of display systems display images, can provide some degree of similarity. After gray-scale transformation of this function, the human eye's response is approximately linear. Therefore, a good medical monitor, the necessary adjustment of gray scale display with a curve to meet DICOM3.14 gray scale display function specified in the function. The higher brightness of the display system is able to distinguish the gray scale display can be few more
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