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“Coffee-break” style test/retest studies were done on a subset of patients under a separate informed consent. These were by preference done at the baseline visit but were also allowed at visit T1. A given patient could only have the test/retest scans at a single visit, and total number of test/retest cases at any given site were limited (maximum 14) to ensure a wide representation of different scanners, sites and field strengths in the test/retest cohort.
Figure 1. ACRIN 6698 study schema.
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