||This ImageJ PlugIn works on stacks derived from DICOM data
which retain the DICOM fields in the slice labels. (To see if the
DICOM fields are present do "Image/Show Info ..." and look for lines
that have the following format: "0028,1053 Rescale Slope:
This plugin is intended
primarily for images which have different DICOM rescaling parameters
for each slice. This tends to be true in particular for Nuclear
Medicine images, especially PET images. ImageJ does not use these
parameters when reading the data with "File/Import/Image Sequence
...". Consequently, images in a stack
end up being displayed on different scales. The plugin will also
set the display lower threshold to zero. This can be helpful when
processing images, especially CT images where the interesting
information is often located at a value around 1000.
The plugin first converts the images using the current
calibration. It then can 1) apply the DICOM "Rescale Intercept"
and "Rescale Slope", 2) subtract the lower threshold equal to "Window
Center" - 1/2 "Window Width", and 3) set negative values to zero.
It changes pixel values, and produces a new uncalibrated stack.
This plugin alters the raw data, but it puts in a format which can
often be useful for further processing. An alternate would have
been to adjust the calibration factors using the DICOM parameters
without affecting the pixel values.
Using separate rescaling parameters for each image is useful when
trying to fit the data into a byte matrix. Using this format has
not made sense for at least the last decade. Hopefully, this
format will disappear; however, unfortunately it has not been