System and method for equalizing pressure in ionization chamber of radiation device

Patent metadata

Field	Value
Publication number	US-12516765-B2
Application number	US-202318536136-A
Country	US
Kind code	B2
Filing date	Dec 11, 2023
Priority date	Apr 21, 2020
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A system for equalizing a pressure in an ionization chamber of a radiation device is provided. The system may include the ionization chamber including: a chamber housing including one or more chamber walls; a chamber volume inside the chamber housing, the chamber volume being filled with a radiation sensitive material; and a pressure adjustment apparatus operably coupled to the chamber volume via at least one wall of the one or more chamber walls, the pressure adjustment apparatus being configured to equalize a first pressure of the radiation sensitive material inside the chamber volume and a second pressure of ambient air outside the chamber housing.

First claim

What is claimed is:

1 . An ionization chamber, comprising:
a chamber housing including one or more chamber walls, wherein one of the one or more chamber walls has a thin thickness less than 2 millimeters to facilitate detection of radiation beams by lowering an amount of attenuation experienced by the radiation beams due to transition through the chamber wall; a chamber volume inside the chamber housing, the chamber volume being filled with a radiation sensitive material; and a pressure adjustment apparatus operably coupled to the chamber volume via at least one wall of the one or more chamber walls, the pressure adjustment apparatus being configured to equalize a first pressure of the radiation sensitive material inside the chamber volume and a second pressure of ambient air outside the chamber housing, 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 ambient air and be nonpermeable for the radiation sensitive material and the ambient air.

2 . The ionization chamber of claim 1 , wherein one of the one or more chamber walls has a thin thickness between 10 micrometers and 2 millimeters.

3 . The ionization chamber of claim 1 , wherein the chamber volume is airtight.

4 . The ionization chamber of claim 1 , wherein the radiation sensitive material includes a gas, and the gas includes ambient air.

5 . The ionization chamber of claim 1 , wherein the tube includes a first end and a second end, the first end being open to the chamber volume, and the second end being open to the enclosure.

6 . The ionization chamber of claim 5 , wherein the at least one wall includes a hole so that the chamber volume is in fluid communication with the pressure adjustment apparatus, and the first end of the tube is airtightly connected with the at least one wall via the hole.

7 . The ionization chamber of claim 5 , wherein the first end of the tube is directly connected to the at least one wall.

8 . The ionization chamber of claim 5 , wherein the first end of the tube is connected with the at least one wall through a connecting piece.

9 . The ionization chamber of claim 5 , wherein the enclosure is in fluid communication with the chamber volume through the tube.

10 . The ionization chamber of claim 5 , wherein the enclosure and the tube are airtight such that the radiation sensitive material inside the enclosure and the tube is isolated from the ambient air.

11 . The ionization chamber of claim 10 , wherein the tube has a varying size or shape along an axis of the tube.

12 . The ionization chamber of claim 1 , wherein
the enclosure is made of a first material having a first elastic modulus, the one or more chamber walls are made of one or more second materials each having a second elastic modulus, and the first elastic modulus is lower than the second elastic modulus.

13 . The ionization chamber of claim 1 , wherein the enclosure is flexible.

14 . The ionization chamber of claim 13 , wherein the enclosure includes a balloon, a bellows, or a flexible enclosure.

15 . The ionization chamber of claim 1 , wherein the second pressure is influenced by at least one of temperature variation, pressure variation, or moisture variation in the ambient air.

16 . The ionization chamber of claim 1 , further comprising:
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.

17 . A radiation system, comprising:
an ionization chamber including a chamber housing, a chamber volume, and a pressure adjustment apparatus, wherein
the chamber housing includes one or more chamber walls, wherein one of the one or more chamber walls has a thin thickness less than 2 millimeters to facilitate detection of radiation beams by lowering an amount of attenuation experienced by the radiation beams due to transition through the chamber wall;
the chamber volume is inside the chamber housing, the chamber volume being filled with a radiation sensitive material; and
the pressure adjustment apparatus is operably coupled to the chamber volume via at least one wall of the one or more chamber walls, the pressure adjustment apparatus is configured to equalize a first pressure of the radiation sensitive material inside the chamber volume and a second pressure of ambient air outside the chamber housing, 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 ambient air and be nonpermeable for the radiation sensitive material and the ambient air.

18 . The radiation system of claim 17 , wherein one of the one or more chamber walls has a thin thickness between 10 micrometers and 2 millimeters.

Assignees

• Shanghai United Imaging Healthcare Co Ltd

Inventors

• Maltz Jonathan
• Stahl Johannes

Classifications

• A61N5/1048

  Monitoring, verifying, controlling systems and methods · CPC title

• A61N5/103

  Treatment planning systems · CPC title

• A61B6/037

  Emission tomography · CPC title

• A61B6/032

  Transmission computed tomography [CT] · CPC title

• A61B6/02 Primary

  Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis · CPC title