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Section 2 -- Installation
2-67
2005 July Rev. B 7F3318
TLII : Created for use with the Toshiba LASER IMAGER INTERFACE (TLII) for Nuclear Medicine
applications. It provides several linear--in--density curves, 5 with increasing density plus 5 with decreasing
density. It also provides 5 approximately linear--in--brightness curves, similar to some of the VER693C0
curves, for an MR MODALITY, Toshiba FLEXART. The combination of diverse curve shapes in this TFT
SET, for different MODALITIES, makes it an example of a hybrid TFT SET.
VER693C0 : A popular, general--purpose TFT SET of S--shaped curves, widely used for CT, MR and
certain other MODALITIES. Curve 6 of this SET is designed to be linear--in--perceived--brightness.
Contrast values below 6 give increased contrast, or slope, next to the end points and decreased
“mid--tone” contrast, near 50% of digital input. Contrast values above 6 give decreased contrast near the
end points and increased mid--tone contrast. The following plots of this TFT SET indicate that all 15 of the
tables have the same mid--tone brightness, with varying degrees of an S--shape contribution which gives
the strongest end--points contrast, or slope, to Table 1 and the strongest mid--tone contrast, or slope, to
Table 15.