Magnetic resonance imaging system detection module

Abstract

The utility model discloses a magnetic resonance imaging system detection module, and relates to the technical field of magnetic resonance detection, the magnetic resonance imaging system detection module comprises a system monitoring box, an upper computer and a radio frequency power amplifier module, the system monitoring box is connected with the upper computer through a network port, and the system monitoring box is electrically connected with the radio frequency power amplifier module through a hardware circuit and an RS232 module; the hardware circuit comprises a detection module and a voltage amplification circuit module, the output end of the radio frequency power amplifier module is electrically connected with the input end of the detection module, and the output end of the detection module is electrically connected with the input end of the voltage amplification circuit module; the input end of the RS232 module is electrically connected with the output end of the radio frequency power amplifier module, and the output end of the RS232 module is electrically connected with the input end of the system monitoring box. According to the utility model, the true value and the effective value of the SAR value can be detected through multiple channels in a mode of combining two kinds of detection.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic resonance detection, in particular to a detection module of a magnetic resonance imaging system. Background Art

[0002] Magnetic resonance imaging is an important clinical imaging method. Its principle is to use the magnetic resonance phenomenon to image the tissues of the human body to be examined, so as to evaluate the morphology of the tissues and determine whether there are any lesions. During the magnetic resonance imaging, radio frequency energy is generated, which is converted into heat energy after being absorbed by the human body, and can also increase the body temperature.

[0003] In order to measure and monitor the degree of accumulation of radio frequency energy in the irradiated part, the specific absorption rate of radio frequency energy is generally used to express it. The specific absorption rate of radio frequency energy is referred to as the SAR value. It generally refers to the radio frequency energy absorbed by each unit of biological tissue. It uses W / Kg as the unit to evaluate the heat energy absorbed by a person during an MRI examination. The higher the value of the specific absorption rate of radio frequency energy, the more heat the radio frequency energy causes the human body to accumulate. When the specific absorption rate of radio frequency energy is too high, it may cause an abnormal increase in human body temperature and pose a risk of damaging physical health. Therefore, the specific absorption rate of radio frequency energy is usually set with a safety range and generally cannot exceed the safety range.

[0004] In medical magnetic resonance imaging systems, it is very difficult to achieve accurate measurement of human SAR. Different magnetic resonance manufacturers have different calculation methods, which are implemented with the help of different mathematical models and simulation methods. SAR value monitoring is to collect data of RF signals in real time, detect the return value of RF forward power and reverse power, calculate it through the host computer, and compare the SAR value with the standard threshold. By comparing the data, the magnetic resonance scan will be paused and ended to avoid harm to the patient. This data processing method places too much demand on the calculation module. Relying solely on the forward and reverse output power data of the power amplifier cannot guarantee the safety of the system and patients, and needs to be improved and optimized. Utility Model Content

[0005] The utility model aims to provide a detection module for a magnetic resonance imaging system.

[0006] The technical problem solved by the utility model is that the existing data processing method has too high requirements on the computing module, the processing measure data is based on a single basis, and the safety of the system and patients cannot be guaranteed, which needs to be improved and optimized.

[0007] The utility model can be implemented by the following technical scheme: a magnetic resonance imaging system detection module, comprising a system monitoring box, a host computer and a radio frequency power amplifier module, wherein the system monitoring box is connected to the host computer via a network port, and the system monitoring box is electrically connected to the radio frequency power amplifier module via a hardware circuit and an RS232 module;

[0008] The hardware circuit includes a detection module and a voltage amplifier circuit module, the output end of the radio frequency power amplifier module is electrically connected to the input end of the detection module, and the output end of the detection module is electrically connected to the input end of the voltage amplifier circuit module;

[0009] The input end of the RS232 module is electrically connected to the output end of the RF power amplifier module, and the output end of the RS232 module is electrically connected to the input end of the system monitoring box. The RS232 module data port reads the internal data of the RF power amplifier module and returns the RF forward and reverse power data to the system monitoring box.

[0010] A further technical improvement of the utility model is that: the output end of the RF power amplifier module is electrically connected to the input end of the RS422 module, and the output end of the RS422 module is electrically connected to the input end of the system monitoring box;

[0011] The system monitoring box detects the RF power amplifier status of the RF power amplifier module through the data of the RS422 module, determines the RF forward and reverse power value status through the system equipment status, and performs different preprocessing according to different statuses.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model can detect the true value and effective value of SAR value through multiple channels by combining two detection methods;

[0014] And it can respond to the system's radio frequency status in different ways, handle possible emergencies promptly and effectively, and prevent patients from being harmed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of module connection of the utility model;

[0017] Figure 2 It is a circuit diagram of the detection module and the voltage amplifier circuit in the utility model;

[0018] Figure 3 This is a schematic diagram of the forward and reverse acquisition circuit of the radio frequency power amplifier in the utility model;

[0019] Figure 4 This is a schematic diagram of the working circuit of the RS232 module in the present utility model;

[0020] In the figure: 1. System monitoring box; 2. Host computer; 3. RF power amplifier module; 4. RS232 module; 5. RS422 module. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0022] See also Figure 1 As shown, a magnetic resonance imaging system detection module includes a system monitoring box 1, a host computer 2 and a radio frequency power amplifier module 3. The system monitoring box 1 is connected to the host computer 2 through a network port, and the system monitoring box 1 provides power to the radio frequency power amplifier module 3;

[0023] The system monitoring box 1 is electrically connected to the RF power amplifier module 3 through the hardware circuit and the RS232 module 4;

[0024] The hardware circuit includes a detection module and a voltage amplifier circuit module, the output end of the RF power amplifier module 3 is electrically connected to the input end of the detection module, and the output end of the detection module is electrically connected to the input end of the voltage amplifier circuit module;

[0025] The connection relationship between the detection module and the voltage amplifier circuit module is as follows: Figure 2 As shown;

[0026] And the system monitoring box 1 detects the RF forward and reverse power of the RF power amplifier module 3 through the detection module and the voltage amplification circuit module. The detection circuit is as follows: Figure 3 As shown;

[0027] The input end of the RS232 module 4 is electrically connected to the output end of the RF power amplifier module 3, and the output end of the RS232 module 4 is electrically connected to the input end of the system monitoring box 1. The data port of the RS232 module 4 reads the internal data of the RF power amplifier module 3 and returns the RF forward and reverse power data to the system monitoring box 1. The detection circuit is as follows: Figure 4 As shown;

[0028] The hardware circuit detects the data and returns the real-time SAR value to the host computer 2 through calculation. By comparing the standard threshold, the magnetic resonance scanning system will be warned and the scanning process will be stopped;

[0029] Avoid harm to patients by comparing data and pausing and stopping sequential scanning;

[0030] In this embodiment, the standard threshold is obtained through experiments.

[0031] The output end of the RF power amplifier module 3 is electrically connected to the input end of the RS422 module 5, and the output end of the RS422 module 5 is electrically connected to the input end of the system monitoring box 1;

[0032] The system monitoring box 1 detects the RF power amplifier status of the RF power amplifier module 3 through the data of the RS422 module 5, determines the RF forward and reverse power value status through the system equipment status, and performs different preprocessing according to different statuses. The preprocessing method is obtained through experiments.

[0033] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A magnetic resonance imaging system detection module, comprising a system monitoring box (1), a host computer (2) and a radio frequency power amplifier module (3), wherein the system monitoring box (1) is connected to the host computer (2) via a network port, and is characterized in that: The system monitoring box (1) comprises a hardware circuit, and the system monitoring box (1) is electrically connected to the radio frequency power amplifier module (3) via the hardware circuit and the RS232 module (4); The hardware circuit comprises a detection module and a voltage amplifier circuit module, the output end of the radio frequency power amplifier module (3) is electrically connected to the input end of the detection module, and the output end of the detection module is electrically connected to the input end of the voltage amplifier circuit module; The input end of the RS232 module (4) is electrically connected to the output end of the radio frequency power amplifier module (3), and the output end of the RS232 module (4) is electrically connected to the input end of the system monitoring box (1).

2. A magnetic resonance imaging system detection module according to claim 1, characterized in that: The output end of the radio frequency power amplifier module (3) is electrically connected to the input end of the RS422 module (5), and the output end of the RS422 module (5) is electrically connected to the input end of the system monitoring box (1).

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