Infrared marker-based method for calculating degree of deformation of thermoplastic film and identifying patient

Abstract

Disclosed in the present invention is an infrared marker-based method for calculating the degree of deformation of a thermoplastic film and identifying a patient. In the method, during a treatment plan formulation phase, infrared markers are fixed to a thermoplastic film of a patient, position data of the thermoplastic film and the infrared markers are acquired by means of an image acquisition device such as CT and magnetic resonance, and on the basis of the relative position relationship between the infrared markers, basic information and treatment information of the patient are bound. During treatment, the positions of the infrared markers are acquired in real time to calculate the degree of deformation of the thermoplastic film. Additionally, by identifying the relative position relationship between the infrared markers, the basic information and treatment information of the patient are identified. The method can effectively monitor the deformation of a thermoplastic film during radiotherapy, thereby improving the precision and quality of radiotherapy.

Description

A method for calculating thermoplastic film deformation and identifying patients using infrared markers Technical Field

[0001] The invention relates to the technical field of puncture therapy and radiotherapy, in particular to a method for calculating the deformation degree of a thermoplastic film and identifying a patient by utilizing infrared markers. Background Art

[0002] During current positioning, medical professionals focus primarily on isocenter selection, believing that simply placing the tumor isocenter on the treatment isocenter is sufficient. However, high isocenter accuracy only means that the tumor's physical isocenter is located on the treatment isocenter. Furthermore, the tumor's orientation and shape may deform due to changes in the patient's posture and posture, and these changes are directly reflected in the thermoplastic film's deformation. Therefore, calculating the thermoplastic film's deformation can easily detect changes in the patient's posture and posture. Furthermore, a stable and reliable algorithm for calculating thermoplastic film deformation currently lacks. Researchers have largely focused on registration accuracy, neglecting the study of thermoplastic film deformation. Studying thermoplastic film deformation can not only improve positioning accuracy but also make conformal treatment more reliable and ensure that plans are more accurately tailored to current registration results.

[0003] Furthermore, radiotherapy rooms typically separate the treatment room and operating room, with information communicated via glass and speakers. Traditionally, the procedure for fractionated radiotherapy involves a medical professional leading the patient into the treatment room and securing them with a body wrap. After receiving instructions from the medical professional to secure the patient in the operating room, the therapist manually enters the patient's name or ID, searches for their basic information and treatment details, and then treats the patient according to the treatment schedule in the system.

[0004] Manually inputting information and searching for relevant information is not only time-consuming but can also lead to incorrect selections due to fatigue. Medical devices with a good user experience not only consider the patient's experience but also optimize medical care operations.

[0005] However, existing treatment planning software basically does not take the above application scenarios into consideration, so there is an urgent need for a method software that can optimize the above phenomenon. Summary of the Invention

[0006] In view of the above phenomenon, the purpose of this method is to propose a method for calculating the deformation degree of thermoplastic film and identifying patients using infrared markers, thereby filling the gap in the relevant treatment-related technical field.

[0007] The technical solution adopted by the method of the present invention is:

[0008] The present invention provides a method for calculating the deformation degree of a thermoplastic film and identifying a patient using infrared markers, the method comprising the following steps:

[0009] S101: When making plans, fix 6 infrared markers on the thermoplastic film;

[0010] S102: When making a plan, the positions of the patient, the thermoplastic film, and the infrared marker are acquired by an image acquisition device;

[0011] S103: During treatment, the position of the infrared marker is collected in real time, and the deformation degree of the thermoplastic film is calculated using a thermoplastic film deformation degree calculation algorithm.

[0012] The infrared marker is fixed on a bony marker of the patient, which is a joint or bone of the patient.

[0013] In addition, the specific steps of the thermoplastic film deformation calculation algorithm are as follows:

[0014] S1031: Based on the positions of the six infrared markers obtained when making the plan, calculate the three-dimensional spatial distance between each two markers, which is recorded as a set D: D = {D1, D2, D3, D4, D5, D6}

[0015] Among them, D k ={d k1 ,d k2 ,d k3 ,d k4 ,d k5 ,d k6}, k={1,2,3,4,5,6}. And d ij represents the three-dimensional distance between infrared markers i and j, i = {1, 2, 3, 4, 5, 6}, j = {1, 2, 3, 4, 5, 6}; in particular, d ii =0, i∈{1,2,3,4,5,6}.

[0016] S1032: During treatment, the infrared tracking device is used to track the three-dimensional spatial position of the infrared marker in real time.

[0017] S1033: Arrange all the acquired infrared markers, and for each arrangement, calculate the three-dimensional space distance between every two markers to obtain the set D′ m , m={1,2,…,720}: D′ m ={D′ m1 ,D′ m2 ,D′ m3 ,D′ m4 ,D′ m5 ,D′ m6}

[0018] in, m={1,2,…,720}. represents the three-dimensional space distance between infrared markers i and j in the mth arrangement, i = {1, 2, 3, 4, 5, 6}, j = {1, 2, 3, 4, 5, 6}; in particular,

[0019] S1034: Calculate sets D and D′ m The error between the elements and S m :

[0020] Wherein, m = {1, 2, ..., 720}, indicating the mth permutation.

[0021] S1035: Error and S m The smallest arrangement is taken as the registration result, and the three-dimensional space transformation matrix T is calculated based on the registered infrared markers. m .

[0022] S1036: According to the three-dimensional space transformation matrix T m and the initial infrared marker position, and calculate the converted infrared marker coordinates.

[0023] S1037: Calculate the offsets of the six infrared markers based on the converted infrared marker coordinates and the coordinates of the infrared marker tracked in real time, and use the average value of the offsets as the deformation degree of the thermoplastic film.

[0024] In addition, the present invention provides a method for identifying a patient using an infrared marker, the method comprising the steps of:

[0025] First, when formulating a treatment plan for a patient, multiple infrared markers are fixed on the patient's body membrane; the patient's image data is captured by an image acquisition system; the system identifies the position of the infrared markers in the image and calculates the relative position relationship between the infrared markers.

[0026] Next, the relative position relationship of the infrared markers is bundled with the patient's basic information and treatment information and stored in a related storage medium.

[0027] During fractionated treatment, the infrared tracking device identifies the infrared markers and calculates the relative position relationship between the infrared markers;

[0028] Next, the basic information and treatment information of the patient that matches the relative position relationship of the infrared markers are found from the storage medium storing the patient information.

[0029] Finally, the patient is treated in stages, and the current treatment information is updated to the patient's treatment information.

[0030] Among them, the number of infrared markers fixed on the patient's body membrane should be no less than 5.

[0031] The present invention proposes a method for calculating thermoplastic film deformation and identifying patients using infrared markers, filling a gap in the relevant technical field. Furthermore, the present invention has the following advantages:

[0032] (1) The present invention does not cause additional radiation damage to patients;

[0033] (2) The present invention does not require additional time or additional operations and is simple and reliable.

[0034] (3) The method of the present invention has low cost.

[0035] (4) The method of the present invention is applicable to most infrared marker-based positioning systems on the market and has good scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a flow chart of the present invention for calculating thermoplastic film deformation and identifying patients using infrared markers.

[0037] FIG2 is a schematic diagram of a patient fixation and an infrared marker fixation. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Referring to Figure 1 , when a patient is given radiotherapy, the patient is first fixed, images are collected, and a plan is formulated.

[0040] First, the patient is fixed to the treatment bed using a thermoplastic film. After the thermoplastic film cools, six infrared markers are fixed to the patient's thermoplastic film.

[0041] Then, a CT image is acquired for the patient, wherein the infrared marker can be acquired by the CT.

[0042] When creating a treatment plan for a patient's fractionation, the infrared markers are drawn on the CT image. The algorithm automatically records and saves the marks of the six infrared markers and calculates the relative positions of the six infrared markers.

[0043] A few days later, when the patient was undergoing radiotherapy, the previously prepared thermoplastic film was used to fix the patient, and the infrared marker was still fixed on the thermoplastic film.

[0044] At the same time, the infrared camera will track the positions of the six infrared markers in real time, perform real-time registration, and calculate the real-time transformation matrix T m .

[0045] The algorithm automatically calculates the offset of the thermoplastic film in the X, Y, and Z axes and displays it on the computer screen to alert the operator. The operator then adjusts the patient's posture based on the real-time thermoplastic film deformation displayed on the screen.

[0046] After adjusting the posture and position, the system prints out a report and saves the records.

[0047] 1 , the main steps of the present invention for identifying a patient using infrared markers are as follows:

[0048] During the treatment planning phase, the operator first fixes the patient with a thermoplastic film and then fixes six infrared markers on the film, which can be imaged by CT.

[0049] Six infrared markers are outlined using the treatment planning system, which automatically calculates the relative positions of the markers. The physiotherapist then creates a treatment plan for the patient. When the plan is saved, the system automatically associates the infrared markers with the patient's basic and treatment information.

[0050] During the treatment, the patient lies on the treatment bed with the help of medical staff, who use the previously prepared body wrap to fix the patient.

[0051] A binocular infrared camera in the radiotherapy room tracks infrared markers in real time and automatically calculates the relative positions between the markers. Based on this calculated relative position, the radiotherapy system matches the most appropriate patient and treatment information in the database. The operator can then deliver radiotherapy according to the treatment plan.

[0052] Finally, when the radiation therapy is completed, the treatment planning system will automatically add the treatment information to the database.

[0053] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for calculating the deformation degree of a thermoplastic film and identifying a patient using infrared markers, characterized in that: Thermoplastic film deformation can be calculated using infrared markers. The specific steps are as follows: S101: When making plans, fix 6 infrared markers on the thermoplastic film; S102: When making a plan, obtaining the positions of the patient, the thermoplastic film, and the infrared marker by an image acquisition device; S103: During treatment, the position of the infrared marker is collected in real time, and the deformation degree of the thermoplastic film is calculated using a thermoplastic film deformation degree calculation algorithm.

2. A method for calculating thermoplastic film deformation and identifying patients using infrared markers according to claim 1, characterized in that: The infrared marker is fixed on a bone marker of the patient, which is a joint or bone of the patient.

3. A method for calculating thermoplastic film deformation and identifying patients using infrared markers according to claim 1, characterized in that: The specific steps of the thermoplastic film deformation calculation algorithm are as follows: S1031: Based on the positions of the six infrared markers obtained when making the plan, the three-dimensional spatial distance between each two markers is calculated, which is recorded as set D: D={D1,D2,D3,D4,D5,D6} Among them, D k ={d k1 ,d k2 ,d k3 ,d k4 ,d k5 ,d k6 }, k = {1,2,3,4,5,6}. And d ij represents the three-dimensional distance between infrared markers i and j, i = {1, 2, 3, 4, 5, 6}, j = {1, 2, 3, 4, 5, 6}; in particular, d ii =0, i∈{1,2,3,4,5,6}. S1032: During treatment, the infrared tracking device is used to track the three-dimensional spatial position of the infrared marker point in real time. S1033: Arrange all the acquired infrared marking points, and for each arrangement, calculate the three-dimensional space distance between every two marking points to obtain a set D′ m , m={1,2,…,720}: D′ m ={D′ m1 ,D′ m2 ,D′ m3 ,D′ m4 ,D′ m5 ,D′ m6 } in, and represents the three-dimensional space distance between infrared markers i and j in the mth arrangement, i = {1,2,3,4,5,6}, j = {1,2,3,4,5,6}; in particular, S1034: Calculate sets D and D′ m The error between the elements and S m : Among them, m = {1, 2, ..., 720}, indicating the mth permutation. S1035: Error and S m The smallest arrangement is taken as the registration result, and the three-dimensional space transformation matrix T is calculated based on the registered infrared markers. m . S1036: According to the three-dimensional space transformation matrix T m and the initial infrared marker position, and calculate the transformed infrared marker coordinates. S1037: Calculate the offsets of the six infrared markers based on the converted infrared marker coordinates and the coordinates of the infrared marker tracked in real time, and use the average value of the offsets as the degree of deformation of the thermoplastic film.

4. A method for calculating the deformation degree of a thermoplastic film and identifying a patient using infrared markers, characterized in that: Patients can be identified using infrared markers, as follows: S201: When formulating a treatment plan for a patient, a plurality of infrared markers are fixed on the patient's body membrane; the image data of the patient is captured by an image acquisition system; the system identifies the position of the infrared markers in the image and calculates the relative position relationship between the infrared markers. S202: Bind the relative position relationship of the infrared markers with the basic information and treatment information of the patient and store them in a related storage medium. S203: During the fractionated treatment, the infrared tracking device identifies the infrared markers and calculates the relative position relationship between the infrared markers; S204: Finding the basic information and treatment information of the patient that matches the relative position relationship of the infrared markers from the storage medium storing the patient information. SS05: Provide treatment to the patient in batches and update the treatment information to the patient's treatment information.

5. A method for calculating thermoplastic film deformation and identifying patients using infrared markers according to claim 4, characterized in that: In step S201, the number of infrared markers fixed on the patient's body membrane should be no less than 5.

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