CN215351865U

CN215351865U - Respiratory motion management system based on laser ranging

Info

Publication number: CN215351865U
Application number: CN202121409768.6U
Authority: CN
Inventors: 钟仁明; 周继丹; 龚攀; 刘元坤; 张祥斌; 肖青; 李帅; 曾露; 李婉
Original assignee: West China Hospital of Sichuan University
Current assignee: West China Hospital of Sichuan University
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-12-31
Anticipated expiration: 2031-06-22

Abstract

The utility model discloses a respiratory movement management system based on laser ranging, which comprises: the laser range finder is provided with a light source for emitting laser and a CCD camera for receiving scattered light and diffuse reflection light, and is arranged on the rocker arm; the system processor is used for processing the signals collected by the laser range finder and controlling the rocker arm and the laser range finder; and the operation terminal is used for receiving operation instructions of an operator for the laser range finder and the rocker arm and transmitting the operation instructions to the system processor, and is in communication connection with the system processor through the communication module. The utility model has simple structure and strong practicability, monitors the respiratory movement by the laser ranging technology, and has the advantages of convenience, high efficiency and low cost.

Description

Respiratory motion management system based on laser ranging

Technical Field

The utility model relates to the field of medical devices, in particular to a respiratory motion management system based on laser ranging.

Background

Respiratory motion is an important error source affecting the accuracy of radiotherapy, and in order to reduce the influence of respiratory motion, techniques such as 4D CT, respiratory Gating (Gating), Tracking (Tracking), Abdominal pressure (Abdominal compression), and Deep Inspiration Breath-hold (DIBH) are commonly used at present. Among other things, DIBH techniques can improve image quality, reduce dose uncertainty, and reduce the dose to heart and lung tissue during breast cancer exposure, in addition to reducing respiratory motion. Therefore, the DBIH technique is a commonly used technique in radiotherapy in the world at present. However, the products for realizing the DIBH technology in the market are imported products, and are expensive, and only a few large radiotherapy centers can purchase and use the products in clinic, which severely limits the clinical popularization of the technology.

The existing products capable of implementing the DIBH technology include: active Breaking Control (ABC) (Elekta), SpiroDynXSDX System (SpiroDynr' X; France), RPM (Varian, Palo Alto, CA), Exac-Trac (Brainlab, Feldkirchen, Germany), Synchroy (Accuray, Morges, Switzerland), AlignRT (Vision RT, London, UK), Catalyst (C-RAD, Uppsala, Sweden), and the like.

The existing main technical routes are divided into three categories: firstly, determining a breathing signal according to the air flow change of a breath mouth of a patient and guiding DIBH according to the breath hose of the patient; the method needs a breathing hose, an airflow turbine, a signal converter, a central control system, an inflator pump, an inflatable air bag and the like; once the breathing hose of the patient leaks air, the system cannot monitor; placing infrared reflection balls on the chest wall, wherein the infrared reflection balls move along with the respiratory motion of the chest wall, and acquiring the position change of the infrared balls by using a camera on a ceiling of a machine room to obtain respiratory signals of a patient; the method needs to place an infrared reflection small ball on the chest wall of a patient, the small ball needs to be fixed by an adhesive tape, and the respiratory signal is possibly influenced by different fixing positions each time; thirdly, a laser projection distance measurement mode is utilized, three laser sources and cameras are installed on the ceiling of an accelerator machine room, laser lines are projected to scan the contour of the chest wall of the patient, the cameras are used for capturing reflected light to measure the fixed distance between the chest wall of the patient and the cameras, and a respiratory signal is obtained according to the fluctuation of the contour of the chest wall.

The method is simple to use, does not need to place infrared reflection balls on the body of the patient, and does not need to connect a breathing hose. However, the methods (i) and (ii) all have the disadvantages of high price, relatively complex operation and the like. Meanwhile, the above methods do not consider the problems of respiratory training and respiratory motion prediction for the patient.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a respiratory movement management system which is compact in structure, low in manufacturing cost and simple and convenient to operate.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

respiratory motion management system based on laser rangefinder includes:

the laser range finder is provided with a light source for emitting laser and a CCD camera for receiving scattered light and diffuse reflection light, and is arranged on the rocker arm;

the system processor is used for processing the signals collected by the laser range finder and controlling the rocker arm and the laser range finder;

and the operation terminal is used for receiving operation instructions of an operator for the laser range finder and the rocker arm and transmitting the operation instructions to the system processor, and is in communication connection with the system processor through the communication module.

Preferably, an optical lens is arranged in front of the CCD camera.

Preferably, still include the dead lever, the dead lever erects and its bed board border fixed connection with CT room, position fixed room or accelerator treatment computer lab, rocking arm stiff end and dead lever fixed connection, rocking arm free end and laser range finder back fixed connection.

Preferably, the operation terminal comprises a display screen for displaying the breathing curve of the patient.

Preferably, the device further comprises a voice module for guiding the patient to do breathing training through voice.

Preferably, the system processor is connected to the CT machine.

Preferably, the system processor is connected with an accelerator of the radiotherapy room.

The utility model has the following beneficial effects:

1. the utility model adopts a single laser range finder (as long as the precision and the scanning frequency can meet the requirements) to monitor the respiratory movement, is not limited by the field, and has simple installation and low price;

2. the voice guidance is utilized to carry out respiratory training, so that the consistency of the respiratory motion amplitude and frequency of a patient is improved, and the accuracy of radiotherapy is improved;

3. the operation is simple, no additional auxiliary device is required to be placed on the patient, and the required respiratory monitoring points can be placed at will.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the respiratory movement management system based on laser ranging comprises:

respiratory motion management system based on laser rangefinder includes:

the laser range finder is provided with a light source for emitting laser and a CCD camera for receiving scattered light and diffuse reflection light, and the laser range finder is arranged on the rocker arm. An optical lens is arranged in front of the CCD camera.

And the system processor is used for processing the signals collected by the laser range finder and controlling the rocker arm and the laser range finder.

In order to fix the laser range finder, the utility model also comprises a fixed rod which is erected and fixedly connected with the edge of the bed board of the CT room, the body position fixing room or the accelerator treatment machine room, the fixed end of the rocker arm is fixedly connected with the fixed rod, and the free end of the rocker arm is fixedly connected with the back of the laser range finder.

For the display of the patient breathing curve, the operating terminal comprises a display screen for displaying the patient breathing curve.

In order to carry out voice prompt on a user or a patient, the utility model further comprises a voice module which is used for guiding the patient to carry out breathing training through voice.

Meanwhile, the system processor is connected with the CT machine. The system processor is connected with an accelerator of the radiotherapy room.

The principle of measuring the distance of the fixed point of the chest wall of the patient by using the laser range finder is as follows:

a beam of laser irradiates on a reference position of an object to be detected at a specific angle, the laser generates scattering and diffuse reflection on the reference surface, and a photosensitive sensing device is placed at another specific position to receive scattered light and diffuse reflection light which are converged by a lens. After the object to be measured is displaced, a beam of laser is irradiated to the position to be measured of the object to be measured at a specific angle, the photosensitive sensing device is placed at the same specific position to receive scattered light and diffuse reflection light at the moment, because the light paths of the object to be measured before and after displacement after laser scattering diffuse reflection are different, the central positions of light spots on the photosensitive sensing device are also different, and the central positions of the light spots at the front and the back are substituted into a geometric triangular relation, so that the displacement distance of the object can be calculated.

In the specific implementation process, the distance measurement is carried out on a fixed point of the chest wall of the patient by using a laser range finder, the fluctuation change of the thorax of the patient is obtained to obtain a respiratory signal, and the laser range finder is convenient to install and can be installed in a body position fixing room, a CT positioning room, an accelerator treatment room treatment bed surface and the like; because the respiratory motion amplitude of the patient is only obtained, the superposition with the centers of the accelerator and the like can not be considered during installation, and the use effect of the device is not influenced when other auxiliary equipment is installed on the original accelerator; can be adjusted up and down and left and right, and is convenient to directly project the laser source at the position where the chest wall of the patient has the maximum breathing motion. The following functions can be realized:

1. according to the measured respiratory motion amplitude and frequency of the patient, the respiratory training can be carried out on the patient by matching with voice guidance, so that the motion amplitude and the frequency of the patient are kept consistent as much as possible, and errors are avoided in the subsequent treatment process;

2. can be associated with analog positioning CT, and transmits the respiration signal to CT in DICOM RT format to realize 4D CT scan;

3. when the accelerator room is used for actual treatment, the accelerator room can be associated with the accelerator, CBCT scanning and accelerator treatment are automatically or manually controlled, and respiratory gating treatment is realized or DIBH technology is adopted for treatment.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model.

Claims

1. Respiratory motion management system based on laser rangefinder, its characterized in that includes:

2. The laser ranging-based respiratory motion management system of claim 1, wherein: an optical lens is arranged in front of the CCD camera.

3. The laser ranging-based respiratory motion management system of claim 1, wherein: the device is characterized by further comprising a fixing rod, wherein the fixing rod is erected and fixedly connected with the edge of a bed board of the CT room, the body position fixing room or the accelerator treatment machine room, the fixed end of the rocker arm is fixedly connected with the fixing rod, and the free end of the rocker arm is fixedly connected with the back of the laser range finder.

4. The laser ranging-based respiratory motion management system of claim 1, wherein: the operation terminal comprises a display screen for displaying the breathing curve of the patient.

5. The laser ranging-based respiratory motion management system of claim 1, wherein: the device also comprises a voice module used for guiding the patient to do breathing training through voice.

6. The laser ranging-based respiratory motion management system of claim 1, wherein: the system processor is connected with the CT machine.

7. The laser ranging-based respiratory motion management system of claim 1, wherein: the system processor is connected with an accelerator of the radiotherapy room.