CN105797285B - A kind of High Intensity Focused Ultrasound system and power detecting method - Google Patents

Abstract

The invention discloses a high-intensity focused ultrasound system, comprising a signal source, a power amplifier, a coupler, a transducer, a power detection module and a control unit, the signal source, the power amplifier, the coupler and the transducer The energy devices are connected in sequence, the control unit is connected to the signal source and the power detection module, and the power detection module is connected to the coupler, and detects the forward power and reverse direction of the coupler periodically and alternately. power. The present invention designs a high-intensity focused ultrasound system, uses the power detection module to detect the forward power and reverse power of the coupler alternately periodically, and can monitor the output power of the power amplifier and the working state of the transducer in real time, so as to Adjust the temperature of the target area, control the energy and duration of the ultrasonic beam concentrated in the target area, which greatly reduces the monitoring cost and ensures the control accuracy of the system.

Description

A high-intensity focused ultrasound system and power detection method

technical field

The present invention relates to the application of high intensity focused ultrasound (High Intensity Focused Ultrasound, HIFU) technology, in particular to a high intensity focused ultrasound system and a power detection method.

Background technique

High Intensity Focused Ultrasound (HIFU) technology is considered to be a new technology for non-invasive treatment of tumors in the 21st century, and has been successfully used in clinical "ablation" of various tumors. The mechanism is to convert controllable electrical energy into ultrasonic beams through the transducer and focus them on the target area, so that the temperature of the target tissue can reach 65° or above in a short time, causing tumor cells to degenerate and necrosis, thereby achieving thermal ablation therapy. tumor purpose. The temperature of the target area is caused by the amount of energy in the focused target area and the duration of the action. Therefore, controlling the energy and duration of the ultrasonic beam focused on the target area is the key to controlling the temperature of the target area.

How to effectively control the size and time of electric energy to achieve safe "cavitation" and "ablation" is an important part of HIFU technology. At present, Agilent and Rohde & Schwarz power sensors are mainly used to realize power monitoring, but two power sensors are required to realize forward power and reflected power at the same time, the circuit structure is relatively complicated, and the cost is also high.

Contents of the invention

In view of the deficiencies in the prior art, the present invention provides a low-cost, high-precision high-intensity focused ultrasound system and a power detection method.

In order to achieve the above object, the present invention adopts the following technical solutions:

A high-intensity focused ultrasound system, including a signal source, a power amplifier, a coupler, a transducer, a power detection module and a control unit, the signal source, the power amplifier, the coupler and the transducer are sequentially connected , the control unit is connected to the signal source and the power detection module, the power detection module is connected to the coupler, and periodically and alternately detects the forward power and reverse power of the coupler respectively.

Wherein, the ratio of the forward power detection period to the reverse power detection period of the power detection module is 99:1.

Wherein, the power detection module includes a forward power detection terminal and a backward power detection terminal connected to the coupler at the same time, and are respectively used to detect the forward power and reverse power of the coupler.

Wherein, the control unit adjusts the output power of the power amplifier in real time according to the forward power.

Wherein, the control unit further includes an alarm module, and when the forward power exceeds a preset forward power value, the alarm module sends out an alarm.

The present invention also provides a power detection method of the above-mentioned high-intensity focused ultrasound system, wherein, in the forward power detection period, the power detection module measures the forward power of the coupler, and then the control unit Calculate the output power of the power amplifier based on the forward coupling degree of the coupler, and the reverse power is displayed as a preset reverse power value; in the reverse power detection period, the power detection module measures the reverse power of the coupler The control unit compares the measured reverse power with the preset reverse power value to judge the working state of the transducer.

By designing a high-intensity focused ultrasound system, the present invention uses the power detection module to detect the forward power and reverse power of the coupler alternately periodically, so that the output power of the power amplifier and the working state of the transducer can be monitored in real time, so that real-time By adjusting the temperature of the target area and controlling the energy and duration of the ultrasonic beam concentrated in the target area, the structure of the system is simpler, which greatly reduces the monitoring cost and ensures the control accuracy of the system.

Description of drawings

FIG. 1 is a schematic diagram of a high-intensity focused ultrasound system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a power detection module of a high-intensity focused ultrasound system according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 1, the high intensity focused ultrasound system of the present invention comprises signal source 10, power amplifier 20, coupler 30, transducer 40, power detection module 50 and control unit 60, signal source 10, power amplifier 20, coupler 30 and The transducers 40 are connected sequentially, the control unit 60 is connected to the signal source 10 and the power detection module 50, the power detection module 50 is connected to the coupler 30, and detects the forward power and reverse power of the coupler 30 alternately and periodically. Here, the control unit 60 may be a computer, a single-chip microcomputer, or the like.

The power amplifier 20 amplifies the signal generated by the signal source 10 and then transmits it to the transducer 40 through the coupler 30, and converts the input electric power into mechanical power, that is, the ultrasonic wave is transmitted. In the forward power detection period T1, the power detection module 50 real-time Detect the forward power of the coupler 30, and feed back the detection information to the control unit 60, the control unit 60 adjusts the output power of the power amplifier 20 in real time according to the feedback information of the power detection module 50, and realizes an over-power alarm; During the detection period T2, the power detection module 50 detects whether the connection or working state of the transducer 40 is good. The reverse power detection is an auxiliary detection, which can be detected by sampling. Therefore, preferably within one detection period, the ratio of the forward power detection period T1 to the reverse power detection period T2 of the power detection module 50 is 99:1.

As shown in FIG. 2, the power detection module 50 of the embodiment of the present invention is a detection probe, including a main body 50a, a forward power detection end 51 connected to one end of the main body 50a, a backward power detection end 52, and a power detection end 52 connected to the main body 50a. The feedback end 53 at the other end; the coupler 30 includes a signal input end 30a, a signal output end 30b, a forward coupling end 30c and a backward coupling end 30d. Wherein, the forward power detecting terminal 51 and the backward power detecting terminal 52 are respectively connected to the forward coupling terminal 30c and the backward coupling terminal 30d of the coupler 30, and are respectively used for monitoring the forward power and the reverse power of the coupler 30 and The data is transmitted to the control unit 60 through the feedback terminal 53 for analysis and processing.

Specifically, the control unit 60 includes an alarm module (not shown in the figure), and when the forward power exceeds a preset forward power value, the alarm module sends out an alarm.

Since the forward coupling degree and the backward coupling degree of the coupler 30 are fixed values, the known output power of the power amplifier 20 can correspond to the measured forward power and reverse power of the coupler 30 in the working state. Therefore, the relationship between the output power of the power amplifier 20 and the forward power and reverse power of the coupler 30 can be known through testing.

Based on the above principles, the present invention provides a power detection method for a high-intensity focused ultrasound system, wherein, in the forward power detection period T1, the power detection module 50 measures the forward power of the coupler 30, and then the control unit 60 according to the coupling The output power of the power amplifier 20 is calculated according to the forward coupling degree and the backward coupling degree of the power amplifier 30, and the reverse power is shown as a preset reverse power value, which is combined with the output power of the power amplifier 20 according to the measurement. The relationship between the output power of the power amplifier 20, the forward power and the reverse power of the coupler 30 is determined; in the reverse power detection period T2, the power detection module 50 measures the reverse power of the coupler 30, and the control unit 60 The measured reverse power is compared with the preset reverse power value to judge the working state of the transducer 40 .

The present invention utilizes the power detection module to periodically and alternately detect the forward power and reverse power of the coupler, so that the output power of the power amplifier and the working state of the transducer can be monitored in real time, so as to adjust the temperature of the target area in real time and control the energy gathered in the target area. The energy size and action time of the ultrasonic beam in the area can be adjusted. The structure of the system is simpler, which greatly reduces the monitoring cost and ensures the control accuracy of the system.

The above description is only the specific implementation of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (5)

1. a high-intensity focused ultrasound system, is characterized in that, comprises signal source (10), power amplifier (20), coupler (30), transducer (40), power detection module (50) and control unit (60 ), the signal source (10), the power amplifier (20), the coupler (30) and the transducer (40) are connected in sequence, and the control unit (60) is connected to the signal source ( 10) and the power detection module (50), the power detection module (50) is connected to the coupler (30), and detects the forward power and the reverse direction of the coupler (30) alternately and periodically power; in the forward power detection period (T1), the power detection module (50) detects the forward power of the coupler (30) in real time, and the control unit (60) according to the power detection module (50) ) feedback information to adjust the output power of the power amplifier (20) in real time. 2. The high-intensity focused ultrasound system according to claim 1, wherein the ratio of the forward power detection period (T1) to the reverse power detection period (T2) of the power detection module (50) is 99:1 . 3. The high-intensity focused ultrasound system according to claim 1, wherein the power detection module (50) includes a forward power detection terminal (51) and a backward power detection terminal (51) connected to the coupler (30) at the same time. terminal (52), respectively used to detect the forward power and reverse power of the coupler (30). 4. The high-intensity focused ultrasound system according to any one of claims 1-3, wherein the control unit (60) also includes an alarm module, and when the forward power exceeds a preset forward power value, the alarm module Send out a warning. 5. The power detection method of the high-intensity focused ultrasound system according to any one of claims 1-4, characterized in that, in the forward power detection cycle (T1), the power detection module (50) measures the coupling The forward power of the coupler (30), then the control unit (60) calculates the output power of the power amplifier (20) according to the forward coupling degree and the backward coupling degree of the coupler (30), and the reverse power Displayed as a preset reverse power value; in the reverse power detection period (T2), the power detection module (50) measures the reverse power of the coupler (30), and the control unit (60) will The measured reverse power is compared with the preset reverse power value to judge the working state of the transducer (40).