US 11,841,104 B2
System and method for equalizing pressure in ionization chamber of radiation device
Jonathan Maltz, Houston, TX (US); and Johannes Stahl, Houston, TX (US)
Assigned to SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed by SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD., Shanghai (CN)
Filed on Apr. 21, 2020, as Appl. No. 16/854,821.
Prior Publication US 2021/0325917 A1, Oct. 21, 2021
Int. Cl. F16L 51/00 (2006.01); G05D 16/20 (2006.01); H01J 47/02 (2006.01); F16L 51/02 (2006.01); G01T 1/185 (2006.01); A61B 6/00 (2006.01); G01T 1/02 (2006.01); A61N 5/10 (2006.01)
CPC F16L 51/00 (2013.01) [A61B 6/44 (2013.01); A61B 6/54 (2013.01); F16L 51/02 (2013.01); G01T 1/185 (2013.01); G05D 16/2013 (2013.01); G05D 16/2066 (2013.01); H01J 47/02 (2013.01); A61N 5/1071 (2013.01); G01T 1/02 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A hybrid of a sealed and unsealed ionization chamber, comprising:
a chamber housing including one or more chamber walls, each of the one or more chamber walls having a thin thickness between 10 micrometers and 2 millimeters to facilitate detection of radiation beams by lowering an amount of attenuation experienced by the radiation beams due to transition through the one or more chamber walls;
a chamber volume inside the chamber housing, the chamber volume being filled with a radiation sensitive material and being on the path of the radiation beams;
one or more electrodes configured to establish an electric field in the chamber volume and measure a charge or current associated with the radiation sensitive material and produced, based on the electric field, in the chamber volume; and
a pressure adjustment apparatus operably coupled to the chamber volume via at least one wall of the one or more chamber walls, wherein the at least one wall includes a hole so that the chamber volume is in fluid communication with the pressure adjustment apparatus, the pressure adjustment apparatus being configured to equalize a first pressure of the radiation sensitive material inside the chamber volume relative to a second pressure of ambient air outside the chamber housing, the second pressure being influenced by at least one of temperature variation, pressure variation, or moisture variation in the ambient air, the pressure adjustment apparatus including a tube and an enclosure configured to function as a reservoir of the radiation sensitive material, wherein
the enclosure is connected to the chamber volume by the tube; and
the enclosure is configured to prevent the chamber volume from being in fluid communication with the ambient air and be nonpermeable for the radiation sensitive material and the ambient air.