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Resolution Requirements
Depending on modalities such as CT, CR, MRI, and FPD, resolution
requirements can range from 1.3 megapixels to 5 megapixels. Generally,
3 megapixel and higer class displays are used for softcopy
interpretation. Where higher accuracy and a subtle reproduction of
grayscale are critical in applications such as mammography imaging, 5
megapixel
resolution is required.
Stable Luminance
Because grayscale properties vary with luminance variations, unstable
luminance significantly impacts imaging diagnosis. When multiple
displays are placed side-by-side, luminance stability and uniformity
across displays take on importance in providing proper diagnosis. In
reality, however, luminance fluctuates greatly due to temperature
changes, startup drift, and aging. Therefore, medical image displays
are usually equipped with luminance stabilizing systems to provide
stable luminance.
Multi-shade Display
Medical image displays must be able to reproduce and display subtle
differences. However, 256 shades of gray that general displays are able
to reproduce do not meet medical requirements due to unevenness and
grayscale discontinuity. Therefore, medical image displays are usually
equipped with a conversion table called LUT (look-up table) to enable
smooth grayscale output. The capability to maximize the number of
simultaneously available shades from 8bit (256 shades of gray) to 11bit
(2048 shades of gray) is further demanded.
Grayscale Faithful to DICOM GSDF
Medical image display systems are commonly calibrated to match their
grayscale characteristics with GSDF (Grayscale Standard Display
Function) defined by DICOM Part 14. Displays can have widely different
grayscale characteristics (commonly called gamma characteristics)
depending on manufacturer, models, individual difference, or luminance
setting. An image displayed on displays with different characteristics
will of course have a different appearance, significantly interfering
with imaging diagnosis.
Other
The task of softcopy interpretation implies going
performing image processing on large numbers of images, an environment
capable of performing quick drawing is essential for stress-free
operation when making diagnostic evaluations and decisions, especially
considering the fact that chest X-ray images are displayed in portrait
orientation.
Recently, thanks to the improvements made to
their luminance contrast, color displays are beginning to be
introduced. This means that a single color display may be able to
support all types of modalities.
Pricing
ME355i2 High luminance greyscale 3MP display $5,300.00
ME551i2 High luminance greyscale 5MP display $8,125.00 *
(* Special Pricing available through 2/28/2008)
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