í [As Is] keeps the voxel values in the copy as the same type as in the original underlay; you
can also change the voxel values to be stored as:
§ [Byte] (integer values: 0..255) Þ 1 byte
each
§ [Short] (integer values: -32767É32767) Þ 2 bytes each
§ [Float] (fractional values) Þ 4 bytes each
§Bytes and Shorts
make the most sense for ROI masks, where you are essentially attaching
labels to voxels
åClick on [Choose Dataset], select the dataset you want a copy of (e.g., the anatomical
underlay), and then press [Set]
¥Step 2: Drawing the ROI (or ROIs):
HChoose the
value to draw into the anatomical overlay dataset (recall that all values in the copied/blank
overlay dataset are zero at this point)
åIf you drawing only
one ROI, then the default value of 1 is good
åIf you are drawing
multiple ROIs, then you should choose a different numerical value for each
so that they can be distinguished later
íPencil and paper are
our friends -- write down which number corresponds with which ROI
for later recall!
HChoose the
drawing color
åThis is the color
that is shown while you are drawing
åColor choice is only
important to give a good contrast with underlay, so donÕt obsess too much over
this