User manual
48
The default when a dose map is calculated is “auto-scaling” and it works well unless the
darkest areas in the image are not due to radiation exposure, but rather occur because
of ink marks on the film or from a mask used on the scanner. In such a case the
apparent dose-range of the image may be much higher than the actual dose range to
the film and lead to loss of precision in the dose measurements. The remedy is to scale
the dose map using a “User defined dose range”.
Enter the dose range values setting the upper value about 25% higher than the
expected maximum dose to the film. Click on the maximum value then enter the new
value, check that
the dose unit is
correct, and press
“Enter” on the
keyboard. Change
the minimum value
if necessary and then click “OK”. Immediately and automatically the dose map will be
recalculated with the new user-selected dose range. Right-click any of the thumbnail
images will reveal a menu of options including saving the image to file,
copying the image to another location in FilmQA
™
Pro or copying the
image as a CSV table of values to a spreadsheet application, e.g. Excel.
When an image is displayed in the image panel (the center window), a
large variety of options and tools are available through the icons on the left
side of the Image Panel and the tabs along the left side of the Image
Evaluation Panel (the right-hand window). The purpose and operation of
these features is described in the Image Panel and Film Evaluation Panel
sections.