Method and apparatus for adjusting dose rates, computer device, and storage medium

Patent metadata

Field	Value
Publication number	US-12329985-B2
Application number	US-202318174430-A
Country	US
Kind code	B2
Filing date	Feb 24, 2023
Priority date	Dec 27, 2021
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

Provided are a method and apparatus for adjusting dose rates, a computer device, and a storage medium. In the method, an output pulse frequency is determined based on a current actual dose, a current target dose, and a current pulse frequency, and then a dose rate of a radiation beam emitted by radiation source equipment is updated based on the output pulse frequency. The current pulse frequency is indicative of the dose rate of the radiation beam emitted by the radiation source equipment, the current actual dose is an actually received dose of the radiation beam for a tumor target region, and the current target dose is an expected dose of the radiation beam for the tumor target region.

First claim

What is claimed:

1. A method for adjusting dose rates, comprising:
acquiring a current actual dose, a current target dose, and a current pulse frequency, wherein the current pulse frequency is indicative of a dose rate of a radiation beam emitted by radiation source equipment, the current actual dose is an actually received dose of the radiation beam for a tumor target region, and the current target dose is an expected dose of the radiation beam for the tumor target region;
calculating a dose difference value based on the current actual dose and the current target dose, wherein the dose difference value is an absolute value of a difference value between the current actual dose and the current target dose;
determining, in response to the dose difference value being not less than a target threshold, a reference compensation value based on the dose difference value, a single pulse dose, a first period, and a second period, wherein the reference compensation value is positively correlated with the dose difference value and is negatively correlated with the single pulse dose, the first period, and the second period, the single pulse dose is a dose of a signal pulse of the radiation beam emitted by the radiation source equipment, the first period is a duration required for each rotation of the radiation source equipment by a target angle, and the second period is a number of rotations of the radiation source equipment between each two adjacent adjustments of the dose rate;
determining a first correction coefficient based on the dose difference value, wherein the first correction coefficient is a value of a piecewise function of the dose difference value and is positively correlated with the dose difference value;
determining a second correction coefficient based on the reference compensation value, wherein the second correction coefficient is a value of a piecewise function of the reference compensation value and is negatively correlated with the reference compensation value;
determining a pulse frequency compensation value based on the first correction coefficient, the second correction coefficient, the current pulse frequency, and the reference compensation value;
acquiring an output pulse frequency by adjusting, based on the pulse frequency compensation value, the current pulse frequency; and
updating, based on the output pulse frequency, the dose rate of the radiation beam emitted by the radiation source equipment.

2. The method according to claim 1 , wherein determining the pulse frequency compensation value based on the first correction coefficient, the second correction coefficient, the current pulse frequency, and the reference compensation value comprises:
determining a first threshold and a second threshold based on the first correction coefficient, the second correction coefficient, and the current pulse frequency;
determining the first threshold as the pulse frequency compensation value in response to the reference compensation value being less than the first threshold;
determining the reference compensation value as the pulse frequency compensation value in response to the reference compensation value being greater than or equal to the first threshold and being less than or equal to the second threshold; and
determining the second threshold as the pulse frequency compensation value in response to the reference compensation value being greater than the second threshold.

3. A method for adjusting dose rates, comprising:
acquiring a current actual dose, a current target dose, and a current pulse frequency, wherein the current pulse frequency is indicative of a dose rate of a radiation beam emitted by radiation source equipment, the current actual dose is an actually received dose of the radiation beam for a tumor target region, and the current target dose is an expected dose of the radiation beam for the tumor target region;
calculating a dose difference value based on the current actual dose and the current target dose, wherein the dose difference value is an absolute value of a difference value between the current actual dose and the current target dose;
determining a pulse frequency compensation value based on the dose difference value and the current pulse frequency;
acquiring an output pulse frequency by adjusting, based on the pulse frequency compensation value, the current pulse frequency;
updating, based on the output pulse frequency, the dose rate of the radiation beam emitted by the radiation source equipment; and
performing an output limitation on the output pulse frequency based on third parameters, wherein the third parameters comprise a maximum dose rate of the radiation beam, a pulse frequency conversion coefficient, a pulse frequency tolerance value, and a maximum value of the output pulse frequency, and the pulse frequency conversion coefficient is a parameter based on which a pulse frequency is converted to a rotation speed of the radiation source equipment;
wherein performing the output limitation on the output pulse frequency based on the third parameters comprises:
determining, in response to the output pulse frequency being greater than a ratio of the maximum dose rate to the pulse frequency conversion coefficient, a calculation result acquired based on the maximum dose rate of the radiation beam, the pulse frequency conversion coefficient, the pulse frequency tolerance value, and the maximum value of the output pulse frequency as the output pulse frequency.

4. The method according to claim 1 , wherein in response to the updated dose rate, the actually received dose of the radiation beam for the tumor target region approaches to the expected dose of the radiation beam for the tumor target region.

5. A computer device, comprising: a memory, a processor, and radiation source equipment, wherein the memory is configured to store one or more computer programs, and the processor, when loading and running the one or more computer programs, is caused to perform the method as defined in claim 1 .

6. A non-transitory computer-readable storage medium, storing one or more computer programs thereon, wherein the one or more computer programs, when loaded and run by a processor, cause the processor to perform the method as defined in claim 1 .

7. A computer program product, comprising instructions, wherein the computer program product, when loaded and run by a computer, causes the computer to perform the method as defined in claim 1 .

8. A chip, comprising: at least one of a programmable logic circuit and a program instruction, wherein the chip, when running, is caused to perform the method as defined in claim 1 .

9. The method according to claim 3 , wherein in response to the updated dose rate, the actually received dose of the radiation beam for the tumor target region approaches the expected dose of the radiation beam for the tumor target region.

10. A computer device, comprising: a memory, a processor, and radiation source equipment, wherein the memory is configured to store one or more computer programs, and the processor, when loading and running the one or more computer programs, is caused to perform the method as defined in claim 3 .

11. A non-transitory computer-readable storage medium, storing one or more computer programs thereon, wherein the one or more computer programs, when loaded and run by a processor, cause the processor to perform the method as defined in claim 3 .

12. A computer program product, comprising instructions, wherein the computer program product, when loaded and run by a computer, causes the computer to perform the method as defined in claim 3 .

13. A chip, comprising: at least one of a programmable logic

Assignees

• Our United Corp
• Shenzhen Our New Medical Tech Development Co Ltd

Inventors

• Wu Yue
• Cheng Hong

Classifications

• A61N5/1071

  for verifying the dose delivered by the treatment plan · CPC title

• A61N5/1067

  in real time, i.e. during treatment · CPC title

• A61N5/103 Primary

  Treatment planning systems · CPC title

• A61N5/1047 Primary

  with movement of the radiation head during application of radiation, e.g. for intensity modulated arc therapy or IMAT · CPC title