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It was concluded that OSEM causes bias in regions located within a hotter background, especially relevant for determination of an IDIF.
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The present observed unidirectional electron beam is a cold beam embedded in the hot background.
Considering this task, we compared the accuracy of activity quantification for objects scanned in hot background.
These curves were used for the iterative segmentation of the current phantom experiments with a hot background activity.
The dark grey area represents a homogeneous sphere with diameter 24 mm in a hot background (light grey).
Figures 4a, b, and c compare the accuracy of quantification achieved with the three segmentation methods for objects scanned in the hot background.
There are a few use cases for hot background location app Highlight, cofounder Paul Davison explains to me when showing off the latest update.
In the experiments where inserts were placed in the hot background, the ratio of sphere to background activity concentration was always close to 6 1 (which corresponds to that often observed in clinical studies).
RC are experimentally derived from PET measurements of hot spheres in hot background, miming oncological lesions.
More realistic models were developed by combining RC derived from hot spots in cold background, RC from cold spots in hot background, and RC from hot spots in warm background, allowing both spill out and spill in effects to be accounted for (e.g., [ 15]), but were never applied to real clinical studies.
Following this consideration, our PVE correction method was based on RC factors derived from PET measurements of hot spheres in hot background, simulating lesions in body tissue under PET study.
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