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Glossary 107
Viewing station
The medical viewing station consists of a computer, a number of
imaging boards (containing one or more heads), an optical sensor
and one or more displays. They are all connected physically, by
means of cables and connectors.
Configuration
The configuration in MediCal Pro is the software representation of
the viewing station’s hardware components.
A complete configuration contains the following information:
• - The number of imaging board heads inside the computer
• - The imaging board properties
• - The number of displays connected to the heads
• - The properties of connected displays
• - Whether or not a sensor is connected or built-in
• - The properties of the sensor, if present
Display Function
A Display Function describes how a display device converts the
voltages at the inputs into light.
In the context of a medical viewing station, a display device is the
combination of imaging board and display.
The display function is a graph that shows how the light from the
picture tube evolves from minimum to maximum luminance while
the data levels at the input of the imaging board go from 0 to
maximum.
Gamma
The Gamma function is a kind of display function, characterizing an
apparatus that converts voltages into light or ink or vice versa.
Displays, printers, scanners, ... all have their own, unique Gamma
function.
In a display, this function is exponential. The Gamma value is the
exponent that determines the shape of the function.
Imaging board head
An imaging board or graphics board converts the digital data from
the computer into analog video voltages.
Most of the common imaging boards contain just one set of video
and sync outputs. However, some high-end boards, like some of
the BarcoMed boards, contain two sets of video and sync outputs.