Methods to compensate for body movement during image scanning and external beam therapy

Abstract

This invention provides a method for compensating for body motion during image scanning and external beam therapy. Garment for real-time detection of body deformation during image scanning includes a front portion made of a compressible material and having multiple fiber Bragg gratings (FBGs). The garment includes multiple light emitters, each configured to pulse light waves through a corresponding FBG, and multiple photosensors, each photosensor attached to a corresponding FBG and configured to receive the pulsed light waves. A processor acquires data via a data acquisition module configured to receive peak wavelengths reflected by the FBGs from the photosensors. Based on an effective offset of the Bragg wavelengths of the FBGs aligned along a Cartesian coordinate system, the processor can correct the acquired image data or redirect external beam therapy to compensate for body deformation during image scanning.

Description

[0001] Related patent applications

[0002] This application is a continuation of U.S. Application No. 16 / 723,352, filed December 20, 2019. The entire teachings of the above application are incorporated herein by reference. Background Technology

[0003] Anatomical and functional imaging modalities such as computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography and single-photon emission computed tomography (PET and SPECT) suffer image degradation due to the patient's respiratory motion. Furthermore, even in some CT scans, requiring the patient to hold their breath during image acquisition is not always feasible, as not all patients can do so due to their age and / or physical condition. Additionally, breath-holding CT scans are typically high-dose scans because the scan needs to be completed rapidly, which can only be achieved by increasing the X-ray flux and rapidly moving the stage. In external beam (photon and particle) radiotherapy, intensity and / or range are modulated, and the beam is rasterized across the tumor to deliver a maximum dose to the tumor while minimizing the dose delivered to surrounding healthy tissue—this is the concept of conformal therapy. Because internal organs and tumors move with the body due to respiratory motion, the effectiveness of intensity- or range-modulated external beam therapy largely depends on respiratory motion compensation.

[0004] Currently, there are two main types of respiratory motion management devices in use. One is the "Anzai" method, which uses a wearable band with an electrical strain sensor, fixed near the patient's diaphragm. Disadvantages of this method include measuring motion only in one plane, and the device being out of the field of view during imaging scans or treatment procedures due to image and treatment area distortion caused by its high attenuation properties. The second type of method uses optical techniques (such as Varian RPM, C-Rad, and GateCT) to use physical markers or reflectors on the patient, reflecting light signals from which motion signals are derived, or to map structured light onto the patient. Disadvantages of this method include significant alteration of light reflection by objects in the path (including the patient's clothing or coverings), and these methods are more difficult to implement in imaging than in treatment. Summary of the Invention

[0005] Embodiments consistent with the principles of this invention include methods and systems for compensating for body deformation during image acquisition. In one embodiment, when acquiring image data of a body, the system acquires peak wavelength data from a plurality of fiber Bragg gratings (FBGs) disposed on the body, the FBGs being aligned along a Cartesian coordinate system on the body. Using the FBGs, the system detects the effective offset of the Bragg wavelengths of the FBGs caused by body deformation during image acquisition. Based on the effective offset of the Bragg wavelengths of the FBGs aligned along the Cartesian coordinate system, the system corrects the acquired image data during image reconstruction to compensate for body deformation during image scanning.

[0006] In some implementations, the system can be used in conjunction with data acquired via computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), or single-photon emission computed tomography (SPECT).

[0007] In other embodiments, the system may include moving a body through a cavity of a scanning device and acquiring volumetric image data of the body on a slice-by-slice basis. The system acquires peak wavelength data from a plurality of fiber Bragg gratings (FBGs) disposed on the body. The system detects effective shifts in the Bragg wavelengths of the FBGs caused by body deformation during image acquisition and controls the movement of the body through the cavity of the scanning device such that the body does not move during body deformation and image data is acquired not based on effective shifts in the Bragg wavelengths of the FBGs.

[0008] Another embodiment of the invention includes a system for compensating for body deformation during external beam therapy, such as photon beam radiotherapy or proton beam therapy used in conjunction with tumor treatment. In one embodiment, a target region of the body for external beam therapy is identified. The system acquires peak wavelength data from multiple fiber Bragg gratings (FBGs) positioned on the body, aligned along a Cartesian coordinate system. The system directs the external beam therapy toward the target region. When a valid offset of the Bragg wavelength of the FBGs due to body deformation during treatment is detected, the external beam therapy can be redirected based on the valid offset of the Bragg wavelength of the FBGs aligned along the Cartesian coordinate system to compensate for body deformation during image scanning, thereby maintaining focus on the target region.

[0009] A garment for real-time detection of body deformation during image scanning includes a front section made of a compressible material and having multiple fiber Bragg gratings (FBGs) positioned on top of a human body, the FBGs aligned along a Cartesian coordinate system. The garment includes multiple light emitters, each configured to pulse light waves through a corresponding FBG and multiple light sensors, each attached to a corresponding FBG and configured to receive the pulsed light waves. A processor acquires data via a data acquisition module configured to receive peak wavelengths reflected by the FBGs from the light sensors. The processor, which may be embedded in the garment or located in a remote device or terminal, also includes a comparator configured to determine the effective offset of the Bragg wavelength due to axial strain on the FBGs.

[0010] The processor may further include a correction module configured to correct acquired image data based on an effective offset of the Bragg wavelength of the FBG aligned along the Cartesian coordinate system to compensate for body deformation during image scanning, or to redirect external beam therapy based on an effective offset of the Bragg wavelength of the FBG aligned along the Cartesian coordinate system to compensate for body deformation during image scanning, thereby maintaining focus on the target area. Attached Figure Description

[0011] As illustrated in the accompanying drawings, the foregoing will become apparent from the following more detailed description of exemplary embodiments, in which the same reference numerals refer to the same parts in different views. The drawings are not necessarily drawn to scale, but rather focus on illustrating the embodiments.

[0012] Figure 1 It is a representative FBG in fiber core.

[0013] Figure 2A and Figure 2B This is an embodiment of clothing that can be used for real-time detection of body deformation during image scanning, according to the principles of the present invention.

[0014] Figure 3 This is a second embodiment of clothing that can be used for real-time detection of body deformation during image scanning, according to the principles of the present invention.

[0015] Figure 4 This is an exemplary medical imaging system in which embodiments consistent with the present invention can be used.

[0016] Figure 5A and Figure 5B It is a cross-sectional image that can be acquired by a medical imaging system.

[0017] Figure 6 This is a flowchart illustrating a method for compensating for body deformation during image acquisition.

[0018] Figure 7 This is an exemplary medical device for external beam therapy that can be implemented in accordance with the present invention.

[0019] Figure 8 This is an explanation of the reason. Figure 7 A cross-sectional view of the body receiving external beam therapy using medical equipment.

[0020] Figure 9 This is a flowchart illustrating a method for compensating for body deformation during external beam therapy.

[0021] Figure 10 This is an exemplary patient treatment system that includes embodiments consistent with the principles of the present invention. Detailed Implementation

[0022] An exemplary implementation is described below.

[0023] like Figure 1 As described, the fiber Bragg grating (FBG) 100 is a short segment of optical fiber 120, which includes multiple reflection points 130a-n that produce periodic variations in refractive index. The FBG reflects a unique wavelength (λB) centered on a bandwidth ΔλB. The periodicity Δ of the grating is related to the Bragg wavelength λB.

[0024] lB = 2.n eff . Λ……………………(1)n eff This is the effective refractive index of a single-mode optical fiber. As the fiber is stretched, the grating parameter Λ increases by δΛ, while the effective refractive index n... eff Reduced δn eff Bragg wavelength λB shift

[0025] δlB=2{n eff. δΛ+Λ.δn eff}.……………….(1a)

[0026] By embedding one or more optical fibers with one or more FBGs in a wearable material, the wearable material can be wrapped around a portion of an anatomically relevant part of the human body, and can be used to sense deformations of said portion caused by physiological processes such as respiration. In some embodiments consistent with the principles of the invention, deformation data can be used to correct certain distortions caused by deformation during image acquisition. In other embodiments, deformation data can be used to assist in the targeted delivery of certain medical treatments by compensating for motion caused by respiration by altering delivery.

[0027] Before using an embedded FBG as a strain gauge, the FBG's response function and linearity should be characterized as a function of the load. To characterize the FBG's response function and linearity, an electrical strain gauge can be used to calibrate the FBG such that the applied tensile load approximates the body displacement reading of a three-dimensional object in a Cartesian coordinate system. For the FBG to function reliably as a strain gauge, the change in the FBG's reflected wavelength must linearly track the electrical strain gauge data when it is stretched under a tensile load. Once calibrated, the FBG's response can be reliably used as an embedded strain gauge to detect surface deformation of an object. Within reasonable limits of the gauge's elasticity, it can also be used to detect the degree of surface displacement. The degree of displacement can be detected based on the calibration curve comparing pressure with strain or wavelength, and strain data from the sensor.

[0028] Figure 2A and Figure 2B These are embodiments of garments 200 and 250, according to the principles of the present invention, capable of real-time detection of body deformation during image scanning. In garment 200, multiple FBG optical fibers 210a-n are embedded laterally along the garment and extend in a direction parallel to the scanning plane A. In garment 250, multiple FBG optical fibers 210a-n are embedded longitudinally along the garment and extend in a direction perpendicular to the scanning plane A. In both embodiments, garments 200 and 250 may have an input 220 for laser or light source transmitted through the FBG optical fibers 210a-n. Each FBG 210a-n is connected to a photosensitive sensor (not shown) that receives pulsed light waves from the light source. Furthermore, garments 200 and 250 may also include an output 230, wherein the photosensitive sensor can provide data to an external processor regarding light transmission through each FBG 210a-n, the external processor being able to identify shifts in the refractive index of the FBG 210a-n, thereby indicating deformation of the object surface within the garment. In other embodiments, the processor may be located inside the garment and transmit data wirelessly, such as via WiFi or Bluetooth. Multiple FBGs 210a-n can help identify locations where specific motion may occur in the cross-sectional scanning plane, as each FBG provides different longitudinal markers along the Cartesian coordinate system. Given the low attenuation properties of this garment, it can be used both during imaging and during treatment.

[0029] Furthermore, the wavelength changes measured over time for freely breathing patients wearing this garment represent patient-specific respiratory signals. These respiratory signals can be used as gating signals for imaging and treatment, similar to currently used respiratory gating devices such as the Anzai band and RPM devices. An added benefit in this case is that the gating device can be within the imaging or treatment field of view without causing imaging artifacts or treatment interference.

[0030] Figure 3This is another embodiment of clothing 300, which, according to the principles of the present invention, can be used for real-time detection of body deformation during image scanning. In this clothing, multiple FBG optical fibers 310a-n are embedded longitudinally along the clothing, and additional multiple FBG optical fibers 350a-n are embedded laterally along the clothing. Furthermore, clothing 300 may also include an output 330, wherein a light sensor can provide data to an external processor regarding light transmission through each of the FBGs 310a-n and FBGs 350a-n, the external processor being able to identify shifts in the refractive index of the FBGs 310a-n and FBGs 350a-n, thereby indicating deformation of the object surface within the clothing. In other embodiments, the processor may be located inside the clothing and transmit data wirelessly, such as via WiFi or Bluetooth. Similar to the FBGs 210a-n of clothing 200 and 250, multiple FBGs 310a-n can help identify locations where specific motion may exist in the cross-sectional scanning plane, as each FBG provides a different longitudinal marker along a Cartesian coordinate system. The addition of FBG 350a-n provides additional data in response to the movement of objects within clothing in different planes, thus allowing for more precise information about the location and intensity of the movement.

[0031] In embodiments of clothing with embedded FBGs for real-time measurement of a patient's body deformation during respiration, multiple FBGs can be embedded using a predetermined coordinate system, such as a Cartesian or polar coordinate system. Furthermore, the predetermined coordinate system can be determined in a way that balances maximizing the fidelity of the measured deformation map while also utilizing the competing benefits of a minimum number of embedded FBGs. This might mean that the embedded FBGs are aligned along a coordinate system relative to the patient's body, or in other cases, they can be positioned for pseudo-random sampling of the patient's body. In some embodiments, this might mean that the FBGs can be distributed such that the concentration of the embedded FBGs is arranged more densely in one region and loosely in other regions. Depending on the nature of the clothing, the distribution of FBGs within the clothing may vary, as the fit of a belt or shirt around the body may differ compared to a blanket. Furthermore, multiple FBGs can be inscribed within a single-mode optical fiber, and as long as they are separated from each other by a predetermined optimal distance, and each of these FBGs has a unique and different Bragg wavelength, a single such fiber can be used to measure strain along its length using a single broadband light source and a single-wavelength multiplexed detection system. This system has a significant advantage over systems based on electrical strain gauges, because in the latter case, each strain gauge requires its own electrical connection.

[0032] Figure 4An exemplary medical imaging system 400 can be used with embodiments consistent with the present invention. System 400 may be a computed tomography (CT) scanner, comprising an X-ray control device 411, a high-voltage generating device 413 for generating high voltage according to an emission signal provided from the X-ray control device 411, a stage 412 on which a subject E is placed and movable in the direction indicated by arrow L, an X-ray source 414 for applying X-rays (photons) to the subject E according to the high voltage provided from the high-voltage generating device 43, an X-ray detector 416 for detecting photons that have passed through the subject E, a data collection device 418 for collecting subject transmission data based on photons detected by the X-ray detector 416, and an image reconstruction device 420 for reconstructing a tomographic image of the subject E based on the subject transmission data collected by the data collection device 418. The X-ray source 414 and the X-ray detector 416 are rotatable in the direction indicated by arrow A. The above components constitute a computed tomography (CT) apparatus. As the X-ray source 414 and X-ray detector 416 rotate around the subject E, image data provides cross-sectional image scans or "slices." Multiple image "slices" are captured as the subject moves through the system along direction L, thus providing a volumetric scan of the subject. The system may further include an image display device 422 for displaying the reconstructed tomographic images on a cathode ray tube (CRT) or similar surface.

[0033] In a typical system, the CT scanner 400 cannot rotate too slowly, and the stage 412 cannot move too slowly; otherwise, respiratory movements during the scan will be reflected in the body scan (e.g., abdominal or thoracic cavity), resulting in image artifacts in the reconstructed CT volume. As the rotational speed of the scanner 400 and the translational speed of the stage 412 increase, the intensity of the X-ray source 414 must be higher to acquire sufficient data for adequate image resolution. However, collisions of photons with the atoms and molecules of living tissue can cause serious tissue damage. The more photons per second that arrive from the X-ray source 414, measured as flux, the greater the likelihood of tissue damage.

[0034] Some embodiments consistent with the principles of this invention include wearable clothing devices with embedded FBGs for real-time detection of respiratory motion. In some embodiments consistent with the principles of this invention, the device can be used as a respiratory gating device to simultaneously control the movement of a CT scanner and the dose of X-rays by separating the acquired data from the body's condition at each stage of the respiratory cycle, thereby reducing the need for breath-holding or averaging the entire respiratory cycle. When the device detects respiratory motion, the CT scanner can pause operation and resume when the body returns to its initial respiratory state. Therefore, if a respiratory gating device can be used to co-scan a patient, the patient's X-ray dose can be reduced.

[0035] In other embodiments, the wearable clothing device can be operated to continuously detect respiratory movements and the degree of deformation caused by respiratory displacement, enabling image data to be acquired without interruption or pause, wherein the deformation data is used for image reconstruction for deformation correction.

[0036] In other implementation schemes, such as Figure 10 As shown, the patient handling system 1000 may include a liner 1080 having an optical fiber containing an embedded FBG, similar to Figure 2A , Figure 2B and Figure 3 The clothing described. For example... Figure 10 As shown, multiple FBG optical fibers 1010a-n are embedded longitudinally along the liner 1080, and additional multiple FBG optical fibers 1050a-n are embedded laterally along the liner. In alternative embodiments consistent with the teachings herein, the liner 1080 may have FBGs embedded in other configurations to provide data related to movement or displacement of the body on the liner. Such optical fibers can also be directly embedded in patient handling systems (beds) of medical imaging and radiotherapy equipment. Figure 2A , Figure 2B and Figure 3 Similar to the clothing shown, the padding may include an output (not shown) where a light sensor can provide data to an external processor. FBG can be used to obtain bed deflection under specific patient loads and respiratory signals from the patient in contact with the bed. Both parameters can be used to optimize patient image acquisition and for delivering treatment to the patient.

[0037] Figure 5A It is a cross-sectional image 500A of subject E that can be acquired by a medical imaging system. Figure 5B A cross-sectional image 500B of subject E is shown, influenced by respiratory movements (e.g., expansion of body cavities during inspiration). When a scanner (such as...) Figure 4 When a CT scanner (400) captures multiple image slices, distortion may occur during volumetric scanning. Figure 5A In image 500A, the height of the cross-section of subject E's body is X1. Figure 5B In image 500B, due to inhalation, the height of the cross-section of subject E's body is slightly higher than X2. Because the CT scanner 400 takes multiple slices along direction L along subject E, the sudden movement between slices (e.g., 500A and 500B) produces significant differences, resulting in a distorted volumetric image in the Cartesian plane. In the two cross-sectional images 500A and 500B, mass M can be located within the scan, and its relative position within the volumetric scan can be detected.

[0038] Return to reference Figure 4Subject E may be wearing clothing 450 consistent with the principles of this invention. This clothing 450 can communicate with a light emitter 460 via an FBG (Optical Packet Gauge) embedded within the clothing 450. Figure 4 (Not shown) transmitted light. When the subject E passes through the scanner 400 along direction L, the processor 470, including the data acquisition module 472, transmits light from the light sensor attached to the FBG (not shown). Figure 4 (Not shown) Data is received. The comparator 475 in the processor 470 can identify the effective shift in the refractive index of the FBG due to axial strain on the FBG and indicate deformation of the object's surface within the clothing. When these deformations are detected, the processor 470 can send deformation correction information to the image reconstruction module 420 to allow image compensation for any motion. In other embodiments, the processor 470, including the FBG data acquisition module 472 and the comparator 475, can be included in the same apparatus as the data collection device 418 and the image reconstruction device 420.

[0039] Figure 6 This is a flowchart illustrating a method for compensating for body deformation during image acquisition of a subject. While image data of the subject is acquired at step 610, peak wavelength data is acquired from multiple fiber Bragg gratings (FBGs) mounted on the subject's body at step 620. At step 630, an effective offset of the Bragg wavelengths of the FBGs caused by body deformation during image acquisition is detected. If an offset is detected, the acquired image data is corrected at step 640 during image reconstruction based on the effective offset of the Bragg wavelengths of the FBGs aligned along a Cartesian coordinate system to compensate for body deformation during image scanning.

[0040] In other embodiments consistent with the principles of this invention, wearable clothing devices with an embedded FBG for real-time detection of respiratory motion can be used to detect body movements (e.g., movements caused by breathing, or muscle spasms) to assist in targeted delivery of treatments, such as external beam radiotherapy. By detecting body movement, the therapy can be positioned to deliver a maximum dose to the tumor and a minimum dose to surrounding healthy tissue.

[0041] Figure 7 This is an exemplary medical device 700 for external beam therapy that can be used with embodiments consistent with the present invention. Medical linear accelerators (LINACs) are commonly used devices for external beam radiotherapy of cancer patients. A linear accelerator includes a gantry 710 that typically uses high-frequency (RF) electromagnetic waves to accelerate charged particles (i.e., electrons) to high energies in a linear path, the linear path being located in a tubular structure called an accelerator waveguide. Figure 7(Not shown in the image). In an alternative embodiment, the medical device may include multiple emitters. Emitter 715 emits high-energy X-rays 725 from the machine, directed to the patient's tumor. The patient lies on a movable treatment table 712. The patient is positioned and can be treated with lasers or mechanical devices (…). Figure 7 (Not shown in the image) to monitor this device. The treatment table moves in and out of the gantry in direction L. In some alternative medical devices, the treatment table can also move the patient from left to right (perpendicular to direction L) and / or up and down (closer to or further away from the transmitter 715). The gantry can rotate around the patient and can deliver radiotherapy to the tumor in the patient's body from multiple angles by rotating the gantry and moving the treatment table.

[0042] Figure 8 This is to explain the passage. Figure 7 A cross-sectional view 800 of a patient P undergoing external beam therapy using a medical device. The illustration shows the transmitter in different positions 810a-e as it rotates around the patient P. In the first position 810a, the transmitter 810 guides some form of beam therapy (such as radiotherapy) through the patient at block M. As the gantry rotates through the second position 810b, the beam continues to pass through the patient at different angles, but continues to be aimed at block M. Radiotherapy passes through healthy tissue, but because the transmitter continues to rotate, the healthy tissue exposed to radiation is minimized. Consistent with the principles of the invention, the patient P can wear an FBG (infrared radiant tube) embedded in clothing. Figure 8 Clothing (not shown in the image) 880. As mentioned above regarding... Figure 2A and Figure 2B and Figure 3 The discussion states that this type of clothing 880 can be used with a light emitter ( Figure 8 (Not shown) Communication, the light emitter transmits light via an FBG embedded within clothing 880. This is similar to a combination... Figure 4 The described processor (including a data acquisition module) receives data from a light sensor attached to the FBG. Due to axial strain on the FBG, an effective change in the FBG's refractive index indicates deformation of the object's surface within the clothing, allowing the medical device to shift the positioning of the patient or transmitter for better targeting of block M and minimizing the dose to non-target tissues.

[0043] Figure 9This is a flowchart illustrating a method for compensating for body deformation during external beam therapy. When the medical device identifies a target area of ​​the body for external beam therapy in step 910, peak wavelength data is acquired from multiple fiber Bragg gratings (FBGs) placed on the subject's body in step 920. In step 930, the external beam therapy is directed to the target area. At step 940, an effective offset of the Bragg wavelength of the FBGs caused by body deformation during treatment is detected. In step 950, upon detection of any offset, the external beam therapy can be shifted based on the effective offset of the Bragg wavelength of the FBGs aligned along a Cartesian coordinate system to compensate for body deformation during image scanning, thereby maintaining focus on the target area. The relative position of the patient to the radiation therapy can be adjusted by moving the position of the transmitter within the gantry or treatment table.

[0044] The low attenuation properties of clothing with embedded FBG allow for more precise medical imaging and radiotherapy with minimal interference. Furthermore, it can increase patient comfort and reduce radiation dose. This device will also open the possibility of manufacturing new, low-cost scanners, as imaging is performed as a function of body deformation, and could make this form of imaging even more widely applicable to cost-sensitive populations.

[0045] While exemplary embodiments have been specifically shown and described, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the appended claims.

[0046] It should be understood that the exemplary embodiments described above can be implemented in many different ways. In some instances, the various methods and machines described herein can each be implemented as physical, virtual, or hybrid general-purpose computers having a central processing unit, memory, disk or other mass storage, communication interfaces, input / output (I / O) devices, and other peripheral devices. A general-purpose computer is transformed into a machine that performs the methods described above, for example, by loading software instructions into a data processor and then executing the instructions to perform the functions described herein.

[0047] As is known in the art, such a computer may include a system bus, where a bus is a set of hardware lines used to transfer data between components of a computer or processing system. One or more buses are essentially shared conduits connecting different elements of a computer system (e.g., processor, disk storage, memory, input / output ports, network ports, etc.), enabling the transfer of information between elements. One or more central processing units are connected to the system bus and provide execution of computer instructions. I / O device interfaces are also typically connected to the system bus for connecting various input and output devices (e.g., keyboard, mouse, monitor, printer, speakers, etc.) to the computer. Network interfaces allow the computer to connect to various other devices attached to a network. Memory provides volatile storage for computer software instructions and data used to implement implementation schemes. Disk or other mass storage provides non-volatile storage for computer software instructions and data used to implement various programs such as those described herein.

[0048] Therefore, implementation schemes can typically be implemented using hardware, firmware, software, or any combination thereof.

[0049] In some embodiments, the processes, apparatus, and programs described herein constitute a computer program product, including non-transitory computer-readable media, such as removable storage media, like one or more DVD-ROMs, CD-ROMs, disks, magnetic tapes, etc., which provide at least a portion of the software instructions to a system. As is well known in the art, such a computer program product can be installed by any suitable software installer. In another embodiment, at least a portion of the software instructions can also be downloaded via cable, communication, and / or wireless connections.

[0050] Furthermore, firmware, software, routines, or instructions may be described herein as performing certain actions and / or functions of a data processor. However, it should be understood that such descriptions included herein are merely for convenience, and such actions are actually generated by a computing device, processor, controller, or other device executing firmware, software, routines, instructions, etc.

[0051] It should also be understood that flowcharts, block diagrams, and network diagrams may include more or fewer elements, may be arranged differently, or may be represented differently. However, it should also be understood that certain implementations may specify block diagrams and network diagrams, and several block diagrams and network diagrams illustrating the implementation of an embodiment may be implemented in a particular manner.

[0052] Therefore, other implementations can also be implemented in various computer architectures, physical computers, virtual computers, cloud computers and / or some combination thereof. Thus, the data processor described herein is for illustrative purposes only and not a limitation on the implementation.

[0053] While the invention has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as defined in the appended claims.

Claims

1. A method for compensating for body motion during image scanning, the method comprising: Acquire image data of the body; Peak wavelength data is acquired from multiple fiber Bragg gratings mounted on the body, the fiber Bragg gratings being aligned along a Cartesian coordinate system; Detect the effective shift of the Bragg wavelength of the fiber Bragg grating caused by body movement during the image scanning; The body movement relative to the scanning device is controlled during the image scanning, and the acquisition of image data during the body movement is controlled based on the effective offset of the Bragg wavelength of the fiber Bragg grating; as well as The acquired image data is corrected based on the effective offset of the Bragg wavelength of the fiber Bragg grating aligned along the Cartesian coordinate system to compensate for the body motion during the image scan.

2. The method as described in claim 1, wherein, The image data was acquired from computed tomography, magnetic resonance imaging, positron emission tomography, or single-photon emission computed tomography.

3. The method as described in claim 1, wherein, The effective offset of the Bragg wavelength of the fiber Bragg grating is used to measure the strain along the biaxial axis of the Cartesian coordinate system.

4. The method of claim 1, wherein, The method further includes: Based on the effective offset of the Bragg wavelength, the scanning device is controlled such that no image data is acquired during the deformation of the body.

5. The method of claim 1, wherein, The method further includes: Identify the target region within the body; and The external beam therapy device is controlled, at least in part, based on the effective offset of the Bragg wavelength of the fiber Bragg grating, to keep it focused on the target region.

6. The method of claim 5, wherein, The target area is a tumor.

7. The method of claim 1, wherein, Multiple fiber Bragg gratings are included in the garment, which is configured to be worn on the body.

8. A method for compensating for body movement during external beam therapy, the method comprising: Identify the target area of ​​the body for external beam therapy; Peak wavelength data is acquired from multiple fiber Bragg gratings mounted on the body, which are aligned along a Cartesian coordinate system; Detect the effective shift of the Bragg wavelength of the fiber Bragg grating caused by the body movement; Controlling the body movement relative to the scanning device during image scanning, and controlling the acquisition of image data during the body movement based on the effective offset of the Bragg wavelength of the fiber Bragg grating; and Based on the effective offset of the Bragg wavelength of the fiber Bragg grating, the external beam therapy device is controlled to guide the external beam therapy to the target area and compensate for the body movement, thereby maintaining focus on the target area.

9. The method of claim 8, wherein, The external beam therapy is external beam radiotherapy or proton beam therapy.

10. The method of claim 8, wherein, The effective offset of the Bragg wavelength of the fiber Bragg grating is used to measure the strain along the biaxial axis of the Cartesian coordinate system.

11. The method of claim 8, wherein, The method further includes: Based on the effective offset of the Bragg wavelength, the scanning device is controlled such that image data of the target area is not acquired during the deformation of the body.

12. The method of claim 11, wherein, The method further includes: Identify tumors within the target region for the external beam therapy; and The external beam therapy device is controlled, at least in part, based on the effective offset of the Bragg wavelength of the fiber Bragg grating, to keep it focused on the tumor within the target region.

13. The method of claim 8, wherein, Multiple fiber Bragg gratings are included in the garment, which is configured to be worn on the body.

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