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The same axial slice from a micro-CT scan of a mouse with lung tumors, using intrinsic retrospective gating and reconstructing endinspiration (A, B) and end-expiration (C, D) with FBP (A, C) and SARTTV (B, D). Note how some larger tumors (red circle) are maintained in the same location in the two respiratory phases while smaller tumors (yellow circle) are changing location and are apparent only in the end-expiration phase. SART-TV improves the clarity of the tumor boundaries.
