CN-114980970-B - System and method for determining radiation parameters

CN114980970BCN 114980970 BCN114980970 BCN 114980970BCN-114980970-B

Abstract

A method includes positioning a patient in a first orientation relative to a radiation source. The method further includes measuring one or more locations of the patient's chest using 3D imaging techniques. The method further includes generating a patient chest model using the one or more locations of the patient's chest when measuring the one or more locations of the patient's chest using 3D imaging techniques, updating the patient chest model as the patient breathes, and exposing the patient to a dose of radiation using the radiation source, wherein the dose is determined from the patient chest model.

Inventors

Janet Patricia Blanco Kiley

Assignees

数据完整性顾问有限责任公司

Dates

Publication Date: 20260505
Application Date: 20191206
Priority Date: 20191204

Claims (7)

1. A method of x-ray imaging, comprising: positioning a patient in a first orientation relative to an x-ray imaging source; Measuring one or more locations of the patient's chest using a 3D imaging technique other than x-ray imaging, the 3D imaging technique using visible or ultraviolet light; In measuring one or more locations of a patient's chest using 3D imaging techniques: creating a point cloud of the patient's chest surface using data of 3D imaging techniques; identifying one or more anatomical landmarks on the patient's chest surface using the point cloud of the patient's chest surface; creating an internal anatomical model of the patient's chest from one or more anatomical landmarks, the internal anatomical model representing a spatial distribution of patient chest density, the patient's chest internal anatomical model comprising a plurality of model points corresponding to an internal region of the patient's chest, each model point of the plurality of model points being associated with an x-ray cross-section; updating an internal anatomical model of the patient's chest as the patient breathes, and Acquiring an x-ray image of the patient's chest includes exposing the patient to a dose of radiation using the x-ray imaging source, wherein the dose is calculated from an x-ray cross-section of a vector through a model of the patient's chest.
2. The method of claim 1, wherein the 3D imaging technique includes light detection and light ranging.
3. The method of claim 1, wherein the radiation dose is determined without acquiring a calibration x-ray image.
4. A method according to any one of claims 1-3, wherein the patient breathes normally when exposed to a dose of radiation.
5. The method of any of claims 1-4, wherein exposing the patient to a radiation dose using the x-ray imaging source according to the patient thoracic model includes adjusting the radiation dose over multiple exposures at different times.
6. An x-ray imaging system, comprising: One or more processors, and A memory storing instructions that, when executed by the one or more processors, cause the one or more processors to perform a set of operations comprising: positioning a patient in a first orientation relative to an x-ray imaging source; Measuring one or more locations of the patient's chest using a 3D imaging technique other than x-ray imaging, the 3D imaging technique using visible or ultraviolet light; In measuring one or more locations of a patient's chest using 3D imaging techniques: creating a point cloud of the patient's chest surface using data of 3D imaging techniques; identifying one or more anatomical landmarks on the patient's chest surface using the point cloud of the patient's chest surface; creating an internal anatomical model of the patient's chest from one or more anatomical landmarks, the internal anatomical model representing a spatial distribution of patient chest density, the patient's chest internal anatomical model comprising a plurality of model points corresponding to an internal region of the patient's chest, each model point of the plurality of model points being associated with an x-ray cross-section; updating an internal anatomical model of the patient as the patient breathes, and Acquiring an x-ray image of the patient's chest includes exposing the patient to a dose of radiation using the x-ray imaging source, wherein the dose is calculated from an x-ray cross-section of the patient through a vector of a model of the patient's chest.
7. A system, comprising: One or more processors, and A memory storing instructions that, when executed by the one or more processors, cause the one or more processors to perform the method of any of claims 2-5.

Description

System and method for determining radiation parameters Technical Field Certain embodiments of the present invention relate to radiation imaging and therapy, and in particular to systems and methods for determining radiation parameters (e.g., dose) of a radiation source (e.g., an x-ray imager or a radiation therapy device). Background Computed Tomography (CT) uses a computer-processed combination of many x-ray measurements taken from different angles to generate cross-sectional (tomographic) images (virtual "slices") of a particular region of a scanned object, thereby enabling a medical professional to visualize the interior of the object (e.g., a patient) without surgery. An important parameter of CT scanning is the dose (e.g. photon number) provided per measurement. Typically, the dose from the x-ray tube is controlled by setting the amount of current flowing through the thermionic filament. If the dose is too low, too many photons will attenuate in the imaged object and the signal-to-noise ratio of the image will be poor. If the dose is too high, the patient is exposed to an unnecessarily large amount of potentially harmful radiation. Thus, for many CT scanners, a set of scout images needs to be taken to calibrate the dose. In a scout scenario, the CT scanner places the rotating gantry in a vertical position (e.g., 0 °). The patient is instructed to hold his breath and the scanning bed is moved rapidly in the aperture. Next, the gantry is stopped in a lateral position (e.g., 90 °), the patient holds his breath again, and the scanner bed is again quickly passed through the aperture. In the imaging scheme, the gantry rotates and the scan bed passes through the aperture. As the gantry completes a 360 ° rotation and moves to the next adjacent gantry position, the x-ray tube current will change (based on the information obtained from the scout image). Disclosure of Invention One major drawback of the above-described investigation scheme is that, because of the calibration image acquired while the patient holds his breath, the image acquired during the imaging scheme must also be acquired while the patient holds his breath. However, as discussed in further detail herein, a large amount of information may be generated by acquiring x-ray images of different respiratory phases. Accordingly, there is a need for systems and methods for determining radiation parameters (e.g., dose) of an x-ray imager while a patient breathes. In some cases, these same principles may be applied to radiation therapy. To this end, embodiments of the present invention provide a method for determining a radiation parameter of a radiation source (e.g., an x-ray imager or a radiation therapy source). The method includes positioning a patient in a first orientation relative to a radiation source. The method further includes measuring one or more locations of the patient's chest using 3D imaging techniques. The method further includes generating a patient chest model using the one or more locations of the patient's chest when measuring the one or more locations of the patient's chest using 3D imaging techniques, updating the patient chest model as the patient breathes, and exposing the patient to a dose of radiation using the radiation source, wherein the dose is determined from the patient chest model. Further, certain embodiments provide a non-transitory computer-readable storage medium storing instructions that, when executed by a system comprising one or more processors, cause the one or more processors to perform a set of operations. One set of operations includes positioning a patient in a first orientation relative to a radiation source. The set of operations further includes measuring one or more locations of the patient's chest using 3D imaging techniques. The set of operations further includes generating a model of the patient's chest using the one or more locations of the patient's chest when measuring the one or more locations of the patient's chest using 3D imaging techniques, updating the model of the patient's chest as the patient breathes, exposing the patient to a dose of radiation using the radiation source, wherein the dose is determined from the patient's chest model. Drawings In order to more clearly describe embodiments of the present disclosure or technical solutions in the prior art, drawings necessary in the description of the embodiments or the prior art will be briefly explained. It is apparent that the drawings in the following description are only some embodiments of the present disclosure. Other figures may be obtained from the structures shown in these figures without inventive effort for a person skilled in the art. Fig. 1 is a schematic block diagram of GREX imaging system including a hardware box, acquisition software, and post-processing software, according to some embodiments of the present disclosure. Fig. 2 is a schematic flow diagram of GREX image acquisition process, according to some embodiments of the