US 11,986,678 B2
Method of calibrating a patient monitoring system for use with a radiotherapy treatment apparatus
Edward William Mead, London (GB); and Ivan Daniel Meir, London (GB)
Assigned to VISION RT LIMITED, London (GB)
Filed by VISION RT LIMITED, London (GB)
Filed on Feb. 9, 2023, as Appl. No. 18/107,879.
Application 18/107,879 is a continuation of application No. 17/549,618, filed on Dec. 13, 2021, granted, now 11,612,766.
Application 17/549,618 is a continuation of application No. 16/635,884, granted, now 11,224,765, issued on Jan. 18, 2022, previously published as PCT/GB2018/052192, filed on Jul. 31, 2018.
Claims priority of application No. 1712462 (GB), filed on Aug. 2, 2017.
Prior Publication US 2023/0181933 A1, Jun. 15, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 5/10 (2006.01)
CPC A61N 5/1075 (2013.01) [A61N 2005/1076 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of determining the relative location of an image capture device of a monitoring system for monitoring the positioning of a patient during radiation treatment and an isocenter of a treatment room towards which a treatment apparatus is arranged to direct radiation, the method comprising:
locating a calibration phantom in a treatment room, wherein in plan-view at least one surface of the calibration phantom closest to at least one image capture device is inclined approximately 45° relative to the camera plane of that image capture device;
obtaining an image of the calibration phantom using the image capture device;
processing the obtained image to identify the relative location of the calibration phantom and the camera plane of the image capture device; and
utilizing the identified location of the calibration phantom and the camera plane of the image capture device to determine the relative location of the camera plane of the image capture device and the isocenter of a treatment room towards which the treatment apparatus is arranged to direct radiation.