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'roi' reads in the positional and shape information from a FITS-format source list and creates a source region and a background region for each non-overlapping source region.
The modified source region and modified background region for each source are defined as the areas of intersection of the source region and background region for that source with the field of view, excluding any overlapping source regions.
The background region for each fragment is selected as the neighborhood surrounding region with a double size excluding the fragment.
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The files will also contain the background extractions and the "areas" (BACKSCAL) of the source and background regions for each spectral bin.
The elliptical background apertures for each science energy band are scaled, annular ellipses co-located with the background region for that source.
We employed this technique to create an anatomical phantom containing a pancreas, two kidneys and a background region for optimizing the SPECT/CT reconstructions to allow quantification of the pancreatic uptake of 111In-exendin in the clinical study [1].
The source and background regions for creating the lightcurves.
Each source in the sample data (ObsID 29) falls into one of the default background regions for the other.
Finally, by using the extracted SVA-based ROIs, a regional bit allocation optimization scheme is presented to allocate more bits on SVA-based ROIs for high image quality and fewer bits on background regions for efficient compression purpose.
The average relative percent SDs in background regions for the gated, gating+, and ungated images were 1.51, 1.05, and 1.00, respectively, indicating superior noise presentation in ungated and gating+ images.
The centroids of the particles are then located using the distance transformation, where the distance to the background region is computed for each foreground (particle) pixel.
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