CN202256685U - Multichannel CT (computed tomography) radiacmeter - Google Patents
Multichannel CT (computed tomography) radiacmeter Download PDFInfo
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- CN202256685U CN202256685U CN2011203866296U CN201120386629U CN202256685U CN 202256685 U CN202256685 U CN 202256685U CN 2011203866296 U CN2011203866296 U CN 2011203866296U CN 201120386629 U CN201120386629 U CN 201120386629U CN 202256685 U CN202256685 U CN 202256685U
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Abstract
The utility model relates to a multichannel CT (computed tomography) radiacmeter, belonging to multichannel radiation testing instruments for medical CT. The multichannel CT radiacmeter is composed of a working power supply, five signal acquisition circuits for acquiring signals from five ionization chambers of CT, a singlechip, a Bluetooth chip and an RS-422 chip. Each signal acquisition circuit adopts an operational amplifier AD8626 to implement current-to-voltage conversion and amplify the converted voltage signal, the amplified voltage signal is subjected to voltage-to-frequency conversion through a voltage-to-frequency converter, the finally output pulse frequency signal is sent into a singlechip to carry out counting, and the singlechip carries out data exchange with a computer through the Bluetooth chip or RS-422 chip. The utility model has the characteristic of high measurement accuracy and high efficiency, and is convenient to operate.
Description
Technical field
The utility model relates to the pick-up unit of X ray computer tomoscanning device, particularly is suitable for the hyperchannel dosage tester of CT.
Background technology
At present, adopt the CT dosemeter that medical diagnosis X radial computer tomoscanning device (being CT) is detected usually.Originally used CT dosemeter all is the single channel dosemeter; Promptly has only a sensor---CT ionization chamber; Carry out to use the CT ionization chamber to measure the dosage of five points in the dosage die body respectively when dosage detects; Could be through calculating CT dosage index (individual layer CT) or volume dosage index (spiral CT), the problem that single channel CT dosemeter mainly exists is following: (1) detection efficiency is low, needs 5 scanning of CT machine could accomplish measurement; (2) at every turn the start shooting instability of radiation output of CT machine can be brought deviation to measurement result.
The utility model content
The purpose of the utility model provides a kind of test hyperchannel CT dosemeter accurately and efficiently.
This novel purpose is achieved in that a kind of hyperchannel CT dosemeter, comprises working power,
Five road signal acquisition circuits: as the ray signal of importing five ionization chambers of CT respectively; Each road signal acquisition circuit structure is: 2,3 pin of operational amplifier A D8626 connect with two ray signal output terminals of corresponding ionization chamber respectively; Series resistor R2 between 2 pin of AD8626 and 1 pin; Capacitor C 1 is parallelly connected with resistance R 2, is connected to 5 pin of AD8626 behind the 1 pin series resistor R1 of AD8626, and 5 pin of AD8626 are connected in series 6 pin that are connected to AD8626 after capacitor C 26 and the resistance R 12 in order; Be serially connected with resistance R 13 between 6 pin of AD8626 and 7 pin; Capacitor C 27 is parallelly connected with resistance R 13, and 7 pin of AD8626 are connected to 6 pin of voltage to frequency converter AD7741, the 2 pin ground connection of AD7741; Be serially connected with capacitor C 40 between 6 pin of AD7741 and 2 pin, 8 pin of AD7741 are as signal output part;
Single-chip microcomputer: the single-chip microcomputer signal input part is connected with the signal output part of above-mentioned five road signal acquisition circuits;
Bluetooth chip or RS-422 chip: be connected with single-chip microcomputer respectively; As communicating with computing machine.
Above-mentioned single-chip microcomputer model is STM32F103, and the Bluetooth chip model is BT1800.
Above-mentioned working power is 8.4V lithium battery or direct current 12V power supply adaptor.
Also have the temperature and air pressure measurement mechanism, the signal output part of temperature and air pressure measurement mechanism is connected with the signal input part of said single-chip microcomputer.
The beneficial effect of the utility model is: this novel can detection CT (medical diagnosis X radial computer tomoscanning device).We have designed five-way road CT dosemeter; Utilize five stock ionization chambers to measure the radiation dose of relevant position CT scan in the dosage die body simultaneously; Handle through special software, obtain the dosage index (individual layer CT) or the volume dosage index (spiral CT) of CT machine immediately.The hyperchannel CT dosemeter of our development has been abandoned the mode of point-to-point measurement in the past, can measure the Specifeca tion speeification of CT fast, accurately, easily.
The utlity model has easy to use, detect fast, numerical value accurately reaches characteristics such as dependable performance.The important technological parameters of this device:
1) dose rate measurement range: 0.01mGy/s – 20mGy/s;
2) dosimetry errors: 2.0%;
3) measuring repeatability: 1.0%;
4) Measuring Time: 0s – 1500s.
The technical indicator of hyperchannel CT dosemeter reaches the technical merit of external like product; Data processing technique is flexible; For hospital, CT machine manufacturing plant, medicine equipment testing agency provide better quality testing instrument, be the quality that further the improves medical services guarantee that provides the foundation.
Description of drawings
Fig. 1 is the electric theory diagram of the utility model.
Fig. 2 is the signal acquisition circuit figure (being I/V conversion and the V/F conversion among Fig. 1) of a passage shown in Figure 1.
Fig. 3 is the communicating circuit figure of single-chip microcomputer shown in Figure 1 and computing machine.
Embodiment
Fig. 1, Fig. 2 illustrate, this novel working power that comprises, five road signal acquisition circuits: as the ray signal of importing five ionization chambers of CT respectively; Each road signal acquisition circuit structure is: 2,3 pin of operational amplifier A D8626 connect with two ray signal output terminals of corresponding ionization chamber respectively; Series resistor R2 between 2 pin of AD8626 and 1 pin; Capacitor C 1 is parallelly connected with resistance R 2, is connected to 5 pin of AD8626 behind the 1 pin series resistor R1 of AD8626, and 5 pin of AD8626 are connected in series 6 pin that are connected to AD8626 after capacitor C 26 and the resistance R 12 in order; Be serially connected with resistance R 13 between 6 pin of AD8626 and 7 pin; Capacitor C 27 is parallelly connected with resistance R 13, and 7 pin of AD8626 are connected to 6 pin of voltage to frequency converter AD7741, the 2 pin ground connection of AD7741; Be serially connected with capacitor C 40 between 6 pin of AD7741 and 2 pin, 8 pin of AD7741 are as signal output part; Single-chip microcomputer: the single-chip microcomputer signal input part is connected with the signal output part of above-mentioned five road signal acquisition circuits; Bluetooth chip or RS-422 chip: be connected with single-chip microcomputer respectively; As communicating with computing machine.Among Fig. 2,4 pin and 8 pin of AD8626 meet DC-5V and DC+5V respectively.
The principle of this dosemeter is as shown in Figure 1.When CT irradiation ionization chamber; Under the effect of high pressure, form little electric current; The ionization chamber signal of five passages has carried out the conversion of electric current to voltage respectively, and then carries out the conversion of voltage to frequency, and the ionization chamber signal that obtains finally is a pulse duration frequency signal; Single-chip microcomputer is counted the pulse of 5 passages, and single-chip microcomputer carries out exchanges data with the counting of five passages through bluetooth or RS-422 and computing machine.Hyperchannel CT dosemeter has adopted lithium battery to add the multiple feed mode of external power adapter, and working power is 8.4V lithium battery or direct current 12V power supply adaptor.When no external power source, instrument is by lithium battery power supply, when the lithium battery quantity not sufficient or when external power source is arranged, and can be by external power source.Because the ionization chamber measurement influences by temperature and air pressure, this dosemeter has been equipped with temperature and air pressure measurement mechanism (its signal output part is connected with the signal input part of single-chip microcomputer), can realize that the ionization chamber temperature and air pressure revises fast.
The signal acquisition circuit of this dosemeter is as shown in Figure 2.Operational amplifier A D8626 realizes the conversion of current/voltage; And to the conversion voltage signal carry out processing and amplifying; Be input to voltage to frequency converter AD7741 through the voltage signal after amplifying and carry out the conversion of voltage to frequency; The final output frequency pulse relevant with voltage, single-chip microcomputer STM32F103 counts 5 group pulses, will count to deliver to computing machine through serial ports and handle.
Communicating circuit is as shown in Figure 3.This dosemeter has adopted two kinds of communication modes and computing machine to carry out the exchange of data: RS-422 chip and Bluetooth chip.Communication modes can only be selected wherein a kind of mode at one time, and when computing machine sends data through Bluetooth chip or RS-422 chip to dosemeter, bluetooth or RS-422 receive, through one or deliver to single-chip microcomputer.When single-chip microcomputer sends data, send for simultaneously RS-422 chip and Bluetooth chip, RS-422 or bluetooth transfer data to computing machine.
It is long that RS-422 has communication distance, high reliability features; Characteristics such as it is the Bluetooth chip BT1800 of Class 1 that bluetooth has adopted power grade, has long transmission distance, easy to connect.
1, ionization chamber: collect the CT ray signal, change the CT ray into current signal.
2, signal acquisition circuit: conversion of signals and amplification with ionization chamber, convert frequency signal again to, single-chip microcomputer is counted frequency signal, and data are sent to computing machine.
3, bluetooth module: utilize Bluetooth technology, realize the data communication between the utility model and the computing machine.
Claims (4)
1. a hyperchannel CT dosemeter comprises that working power is characterized in that,
Five road signal acquisition circuits: as the ray signal of importing five ionization chambers of CT respectively; Each road signal acquisition circuit structure is: 2,3 pin of operational amplifier A D8626 connect with two ray signal output terminals of corresponding ionization chamber respectively; Series resistor R2 between 2 pin of AD8626 and 1 pin; Capacitor C 1 is parallelly connected with resistance R 2, is connected to 5 pin of AD8626 behind the 1 pin series resistor R1 of AD8626, and 5 pin of AD8626 are connected in series 6 pin that are connected to AD8626 after capacitor C 26 and the resistance R 12 in order; Be serially connected with resistance R 13 between 6 pin of AD8626 and 7 pin; Capacitor C 27 is parallelly connected with resistance R 13, and 7 pin of AD8626 are connected to 6 pin of voltage to frequency converter AD7741, the 2 pin ground connection of AD7741; Be serially connected with capacitor C 40 between 6 pin of AD7741 and 2 pin, 8 pin of AD7741 are as signal output part;
Single-chip microcomputer: the single-chip microcomputer signal input part is connected with the signal output part of above-mentioned five road signal acquisition circuits;
Bluetooth chip or RS-422 chip: be connected with single-chip microcomputer respectively; As communicating with computing machine.
2. hyperchannel CT dosemeter according to claim 1 is characterized in that said single-chip microcomputer model is STM32F103, and the Bluetooth chip model is BT1800.
3. hyperchannel CT dosemeter according to claim 2 is characterized in that, said working power is 8.4V lithium battery or direct current 12V power supply adaptor.
4. according to the described hyperchannel CT of the arbitrary claim of claim 1～3 dosemeter, it is characterized in that also having the temperature and air pressure measurement mechanism, the signal output part of temperature and air pressure measurement mechanism is connected with the signal input part of said single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203866296U CN202256685U (en) | 2011-10-12 | 2011-10-12 | Multichannel CT (computed tomography) radiacmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203866296U CN202256685U (en) | 2011-10-12 | 2011-10-12 | Multichannel CT (computed tomography) radiacmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202256685U true CN202256685U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203866296U Expired - Lifetime CN202256685U (en) | 2011-10-12 | 2011-10-12 | Multichannel CT (computed tomography) radiacmeter |
Country Status (1)
| Country | Link |
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| CN (1) | CN202256685U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520432A (en) * | 2011-10-12 | 2012-06-27 | 四川中测辐射科技有限公司 | Multi-channel CT dosimeter |
| CN105277782A (en) * | 2015-10-19 | 2016-01-27 | 陕西宝成航空仪表有限责任公司 | Novel voltage frequency conversion sampling device and work method thereof |
-
2011
- 2011-10-12 CN CN2011203866296U patent/CN202256685U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520432A (en) * | 2011-10-12 | 2012-06-27 | 四川中测辐射科技有限公司 | Multi-channel CT dosimeter |
| CN102520432B (en) * | 2011-10-12 | 2014-02-26 | 四川中测辐射科技有限公司 | Multi-channel CT dosimeter |
| CN105277782A (en) * | 2015-10-19 | 2016-01-27 | 陕西宝成航空仪表有限责任公司 | Novel voltage frequency conversion sampling device and work method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151020 Address after: 610056 Sichuan city of Chengdu province Yushuang Road No. 10 Patentee after: Radiation Institute of NIMTT Address before: 610056 Sichuan city of Chengdu province Chenghua District Yushuang Road No. 10 Building Room 204 Patentee before: Sichuan Zhongce Technology Development Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20120530 |
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| CX01 | Expiry of patent term |