Patent ID: 11911207
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 15:
16. A C-arm registration method executable by a C-arm registration controller for registering a C-arm to a X-ray ring marker, the X-ray ring marker including a coaxial construction of a chirp ring and a centric ring on an annular base, the C-arm registration method comprising:
acquiring, via the C-arm registration controller, a baseline X-ray image illustrative of the X-ray ring marker within a baseline X-ray projection by the C-arm at a baseline imaging pose;
deriving, via the C-arm registration controller, baseline position parameters of the X-ray ring marker as a function of an illustration of the centric ring within the baseline X-ray image, the baseline position parameters being definitive of a position of the X-ray ring marker within the baseline X-ray projection; and
deriving, via the C-arm registration controller, a baseline twist parameter definitive of the X-ray ring marker as a function of the baseline position parameters and of an illustration of the chirp ring within the baseline X-ray image, the baseline twist parameter being definitive of a twist of the X-ray ring marker within the baseline X-ray projection.