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This configuration is not for everyone. If the team is large or if the personal dynamics of the group are such that radiologists aren't disposed to play fairly, then this model can be problematic. Still, for small, efficient groups this can be a very productive scheme for case distribution.
Additional Considerations
It should be noted that these three models are not mutually exclusive. It is possible to use these models in conjunction with one another. For example, a workflow manager might use auto assignment for a certain group of facilities with an established team of radiologists, but may need more direct control over cases assigned to a new radiologist.
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