| CPC A61B 6/107 (2013.01) [A61B 6/022 (2013.01); A61B 6/0407 (2013.01); A61B 6/0421 (2013.01); A61B 6/0487 (2020.08); A61B 6/12 (2013.01); A61B 6/4241 (2013.01); A61B 6/4258 (2013.01); A61B 6/5235 (2013.01); A61B 6/547 (2013.01); A61N 5/1042 (2013.01); A61N 5/1082 (2013.01); A61N 2005/1054 (2013.01); A61N 2005/1059 (2013.01); A61N 2005/1074 (2013.01); A61N 2005/1094 (2013.01)] | 40 Claims |

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1. An imaging system to facilitate radiotherapy delivery during a radiotherapy procedure comprising:
an imaging radiation beam emitter mounted in the system to be in line with an isocenter at which a target is disposed, wherein the imaging radiation beam emitter is configured to revolve about a first axis intersecting the isocenter;
an imaging radiation beam detector unit mounted in the treatment system opposite the imaging radiation beam emitter, wherein the detector unit is movable independently from the beam emitter; and
a control unit operably coupled with the imaging radiation beam emitter and detector, the control unit being configured to:
obtain a first image with the imaging radiation beam emitter and detector at a first position of the emitter; and
obtain a second image with the imaging radiation beam emitter and detector at second position of the emitter.
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