US 12,392,911 B2
Method of measuring absorbed dose of radiation in small irradiation fields
Hyun Tai Chung, Seoul (KR); Tae Hoon Kim, Seoul (KR); and Yong Kyun Kim, Sejong (KR)
Assigned to Seoul National University R&DB Foundation, Seoul (KR); and IUCF-HYU (Industry-University Cooperation Foundation Hanyang University), Seoul (KR)
Filed by SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR); and IUCF-HYU (INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY), Seoul (KR)
Filed on Aug. 7, 2023, as Appl. No. 18/366,317.
Application 18/366,317 is a continuation of application No. PCT/KR2021/019555, filed on Dec. 22, 2021.
Claims priority of application No. 10-2021-0037457 (KR), filed on Mar. 23, 2021.
Prior Publication US 2023/0375721 A1, Nov. 23, 2023
Int. Cl. G01T 1/20 (2006.01); G01T 1/02 (2006.01); G01T 7/00 (2006.01)
CPC G01T 1/023 (2013.01) [G01T 7/005 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of measuring an absorbed dose of radiation in small irradiation fields, comprising:
acquiring absorbed dose distribution data of radiation;
determining a region where an absorbed dose of radiation of a predetermined ratio or more is absorbed based on the absorbed dose distribution data of radiation;
forming a scintillator having a shape in which a plurality of hexahedral cells are coupled to have a shape matching the region;
measuring an absorbed dose of radiation irradiating the scintillator from a radiation irradiation device; and
calculating the absorbed dose of radiation of the cell at a predetermined position by using Equations 1 to 4,

OG Complex Work Unit Math
(D(a,b,c) is an absorbed dose of radiation of the cell located at the a-th in the x-axis direction, the b-th in the y-axis direction, and the c-th in the z-axis direction on the three-dimensional coordinate system based on the cell located at a predetermined position of the scintillator, and D(i,j,k) is an absorbed dose of radiation of the cell located at the i-th in the x-axis direction, the j-th in the y-axis direction, and the k-th in the z-axis direction on the three-dimensional coordinate system based on the cell located at a predetermined position of the scintillator)

OG Complex Work Unit Math
(Kv is the volume average correction factor, Vcell is the volume of the scintillator, and

OG Complex Work Unit Math
 is the information included in the absorbed dose distribution data of radiation)

OG Complex Work Unit Math
(Dm is the average absorbed dose of radiation measured by the scintillator, Dd is the total absorbed dose of radiation measured by the scintillator, and Vcell is the volume of the scintillator)
D(a,b,c)=Kr*Dm  [Equation 4]
(D(a,b,c) is the absorbed dose of radiation of the cell located at the a-th in the x-axis direction, the b-th in the y-axis direction, and the c-th in the z-axis direction on the three-dimensional coordinate system based on the cell located at a predetermined position of the scintillator, Kv is the volume average correction factor, and Dm is the average absorbed dose of radiation measured by the scintillator).