US 12,420,115 B2
Characterizing physical properties of an attenuating element in a radiotherapy device
Joshua Freedman, Crawley (GB); David Roberts, Crawley (GB); and Stefan Pencea, Decatur, GA (US)
Assigned to Elekta Limited, Crawley (GB)
Appl. No. 17/757,520
Filed by Elekta Limited, Crawley (GB)
PCT Filed Dec. 16, 2020, PCT No. PCT/EP2020/086439
§ 371(c)(1), (2) Date Jun. 16, 2022,
PCT Pub. No. WO2021/122761, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 1918767 (GB), filed on Dec. 18, 2019.
Prior Publication US 2023/0028022 A1, Jan. 26, 2023
Int. Cl. A61N 5/10 (2006.01)
CPC A61N 5/1048 (2013.01) [A61N 5/1042 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of characterizing physical properties of an attenuating element in a radiotherapy device including a radiotherapy radiation source located on a first side of the attenuating element and a radiotherapy radiation detector located on a second side of the attenuating element, wherein the attenuating element comprises a cylindrical component, and wherein the cylindrical component comprises one of a cryostat, a gradient coil, or a quadrature body coil, the method comprising:
obtaining an average detected radiotherapy radiation intensity at two or more locations around the attenuating element;
comparing a detected intensity at one location with the average radiotherapy radiation intensity; and
characterizing a corresponding physical property based on the comparison, wherein the characterized physical property is at least one perturbation coefficient given by the equation:

OG Complex Work Unit Math
 and wherein

OG Complex Work Unit Math
 is derived from comparing the detected intensity at one location with the average intensity.