US 11,911,207 B2
X-ray ring markers for X-ray calibration
Alexandru Patriciu, Belmont, MA (US); Alyssa Torjesen, Charlestown, MA (US); Molly Lara Flexman, Melrose, MA (US); Ashish Sattyavrat Panse, Burlington, MA (US); Marcin Arkadiusz Balicki, Cambridge, MA (US); and Ronaldus Frederik Johannes Holthuizen, Culemborg (NL)
Assigned to KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
Appl. No. 17/423,921
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Mar. 25, 2020, PCT No. PCT/EP2020/058278
§ 371(c)(1), (2) Date Jul. 19, 2021,
PCT Pub. No. WO2020/193598, PCT Pub. Date Oct. 1, 2020.
Claims priority of provisional application 62/823,190, filed on Mar. 25, 2019.
Prior Publication US 2022/0087633 A1, Mar. 24, 2022
Int. Cl. A61B 6/00 (2006.01); A61B 6/08 (2006.01)
CPC A61B 6/584 (2013.01) [A61B 6/4441 (2013.01); A61B 6/08 (2013.01); A61B 6/587 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A C-arm registration system, comprising:
a X-ray ring marker including a coaxial construction of a chirp ring and a centric ring on an annular base; and
a C-arm registration controller for registering a C-arm to the X-ray ring marker, wherein the C-arm registration controller is configured to:
acquire 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;
derive 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
derive a baseline twist parameter 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.