CN107307878A - A kind of CT system temprature control method - Google Patents
A kind of CT system temprature control method Download PDFInfo
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- CN107307878A CN107307878A CN201710525077.4A CN201710525077A CN107307878A CN 107307878 A CN107307878 A CN 107307878A CN 201710525077 A CN201710525077 A CN 201710525077A CN 107307878 A CN107307878 A CN 107307878A
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- detector
- temperature
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- temperature range
- matrix
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
Abstract
The application is related to a kind of CT system, including：CT bulbs；Detector module, is oppositely arranged with CT bulbs, and the detector module includes matrix, the detector being arranged in matrix；Temperature sensor, including it is arranged at the second temperature sensor unit of the first temperature sensor unit and intrinsic silicon outside matrix.
Description
Technical field
The present invention relates to medical image system, more particularly to CT system temprature control method.
Background technology
Computed tomography (Computed Tomography, CT) is an important breakthrough of x-ray imaging technology,
Blood clot, gastrointestinal disease and human body soft tissue in diagnosis of vertebral and the swollen disease of head injury, encephalic, brain is medically can be used to damage
Wound etc..The primary structure of current computed tomograph scanner system includes two large divisions：X-ray tomography device and computer
Device.The former is main to be made up of the high pressure generator and bulb of generation X-ray beam and reception, the detector of detection x-ray, the latter
Mainly include the auxiliary equipments such as data collecting system, CPU, operating desk, image display.X-ray bulb and detection
Device is separately mounted to the both sides of scanned tissue, and direction is relative.Its principle substantially is：CT is penetrated using human body different tissues to X
The absorption of line, is tested aspect by human body and is divided into many cube fritters (voxel), CT measures the density and ash of each voxel
Spend (pixel), decay total amount of the X-ray after selecting aspect is the summation of each voxel X-ray attenuation amount, rotates bulb, x-ray
From different perspectives through selected aspect, after rotation repeatedly, a simultaneous equations can be obtained, in the equation, x-ray decay total amount is known
Value, each voxel x-ray pad value is unknown quantity, each voxel X-ray attenuation value (each pixel of correspondence) is obtained through computer computing, by this
A little pixels constitute the faultage image of width two dimension, and two-dimensional images can be combined into a secondary 3-D view.
In CT data collecting systems, detector is the core component of whole system, and its structure is sufficiently complex, and it directly connects
Receive X-ray beam and pass through the photon signal after measured object, corresponding electric signal is converted to by the characteristic of its own, one typical
CT detectors mainly include medium (such as gas scintillator), photoelectric conversion array and electronics, in addition with collimater,
The auxiliary equipments such as power lights.In the detector course of work, X-ray signal, which is irradiated to plane of crystal, can produce partial heat energy, with
X-ray radiation energy can be converted to the energy of thermal motion of lattice afterwards, so as to cause detector crystal temperature to raise.However, detection
Such as cadmium tungstate crystal of material used in device is very sensitive for temperature, and the change of environment temperature can cause photoelectricity peak shift,
Influence opto-electronic conversion performance.It is worse to be, if temperature change is excessive, crystal counter performance will be caused to change, weight
Build image and striped occur, so as to influence diagnosis to recognize.
In the prior art, CT detector systems are mostly arranged on a larger metallic matrix, in order that detector temperature
Degree maintains maintenance level, and a kind of conventional settling mode is that some semiconductor temperature sensors are set on metallic matrix, are added
Thermal device and cooling device, cooling fan or heater are controlled according to the temperature of temperature sensor feedback metal base surface
The work of part, so as to maintain detector temperature within the specific limits.Another settling mode is that temperature sensor is integrated in CT
Inside detector, the input of thermostat unit is used as by the use of its internal temperature sensor.But both the above mode is all deposited
In certain risk, i.e., the temperature sensor inside external temperature sensor and detector on metallic matrix is likely to
Generation is abnormal, so as to cause the temperature value for feeding back non-genuine, so as to cause temperature control to enter abnormal state of affairs.Also,
In CT running, the factor such as frame rotation, bulb radiating, sensor feedback delay can be to whole CT detector systems temperature
Control can all produce influence, the temperature of temperature sensor feedback is inevitably variant with detector actual temperature, and with
The difference for condition changes.In consideration of it, being necessary to propose that the CT imaging methods that temperature fluctuation produces artifact can be prevented effectively from.
The content of the invention
In order to solve the climate control issues of detector in CT system, on the one hand the application discloses a kind of CT scan system
System.The CT scan system includes：CT bulbs；Detector module, is oppositely arranged with CT bulbs, and the detector module includes base
Body, the detector being arranged in matrix；Temperature sensor, including be arranged at the first temperature sensor unit outside matrix and
The second temperature sensor unit of intrinsic silicon.
Preferably, include outside described matrix towards the front of CT bulbs and the dorsad reverse side of CT bulbs and positioned at just
Side between face and reverse side, first temperature sensor is arranged at side.
Preferably, the detector includes several detector cells, with towards the first face of CT bulbs and dorsad CT
Second face of bulb, the second temperature sensor is arranged at the second face.
Preferably, the second temperature sensor is arranged on the side between the first face of detector cells, the second face.
Preferably, the detector includes several detector cells, and the side of several detector cells forms arc
Face.
Preferably, the thermostat unit includes one or more heating units and one or more cooling units.
Preferably, whether the thermostat unit is used for the temperature for judging the detector in the first object temperature
In the range of, and produce the first result；Whether the thermostat unit is used for the temperature for judging the metallic matrix described the
In two temperature ranges, and produce the second result.
Preferably, if first result is equal to second result, and the detector temperature higher than described
The upper limit of first object temperature range, then begin to cool down the detector；If first result is equal to second result,
And the temperature of the detector is less than the lower limit of the first object temperature range, then begins to warm up the detector.
Preferably, if first result is equal to second result, and the temperature of the metallic matrix is higher than institute
The upper limit of the second target temperature range is stated, then begins to cool down the detector；If first result is equal to second knot
Really, and the metallic matrix temperature be less than second target temperature range lower limit, then begin to warm up the detector.
On the other hand, present application discloses a kind of temprature control method of CT system detector, including：Obtain detector
Temperature, judges the temperature of the detector whether in first object temperature range, and produces the first result；Obtain metallic matrix
Temperature, judge the temperature of the metallic matrix whether in the second target temperature range, and produce the second result；If described
First result is equal to second result, and the upper limit of the temperature higher than the first object temperature range of the detector,
Then begin to cool down the detector；And, if first result is equal to second result, and the temperature of the detector
Degree then begins to warm up the detector less than the lower limit of the first object temperature range.
Brief description of the drawings
Fig. 1 is CT system structural representation of the present invention；
Fig. 2 is the detector and heating thereon, the layout of cooling unit of embodiment of the present invention；
Fig. 3 is CT system temperature control flow schematic diagram.
Embodiment
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, with reference to the accompanying drawings and examples
Embodiment to the present invention is described in detail.
In order to intactly understand the present invention, Fig. 1 is refer to, represents that the CT system structure of the present invention in a preferred embodiment thereof is shown
It is intended to.The CT system includes but is not limited to CT bulbs 101, collimater 102, detector module, high pressure generator 105, temperature and adjusted
Save unit 106, sensor unit 107, data collecting system (data acquisition system, DAS) 110, center processing
Unit 120, image reconstruction unit 130 and display 140.
High pressure generator 105 is used to receive the order of CPU 120 and controls the work of CT bulbs 101.CT balls
Pipe 101 is used for providing X-ray 103.Human body that the X-ray 103 is placed through on scanning bed simultaneously produces part decay.Detector mould
Group is oppositely arranged with CT bulbs, and spy includes matrix and the detector 104 being arranged in matrix.The receiving portion of detector 104 decays
X-ray signal and be converted to corresponding electric signal.Detector 104 is installed on inside metallic matrix, and is installed with CT bulbs 101
In the opposite sides of frame.Detector 104 can include arranged with array way scintillation crystal, positioned at scintillation crystal lower floor
The chip substrate of ASIC (Application Specific Integrated Circuit) chips and scintillation crystal.Detection
Device 104 can include several detector cells, and the side of several detector cells forms cambered surface.Detector cells have
Towards the first face of CT bulbs and dorsad the second face of CT bulbs.
The data collecting system 110 being connected with the system of detector 104 obtains the electric signal that detector 104 is exported.For example, visiting
Surveying device 104 includes asic chip, by the X-ray signal received and can be converted to corresponding electric signal.Above-said current signal is passed through
A/D converter is converted to data signal (data for projection).CPU 120 connects data collecting system 110, receives projection
Data.The data for projection that 120 pairs of CPU is received carries out data compression and reformatting processing, after then handling
Data storage (for example, being put into caching) and/or be further processed.Data after processing can be cached in image reconstruction list
Member 130.Data for projection after back projection's controller in image reconstruction unit 130 handles control module is distributed to back projection's version
Unit.The data that each back projection unit is accommodated can project to six projections from one, and be stored simultaneously, connect
Image data and each back projection's plate progress summation operation resulting pixel is sent to together with the result of each back projection unit
Data, you can reconstruction obtains tomographic image, and show or store on a storage device in display 140.
In CT system scanning process, the change of energy can to visit in the irradiation and photoelectric conversion process due to X-ray
The temperature rise of device is surveyed, and the fluctuation of detector working environment can influence its photoelectric transformation efficiency, finally rebuild obtained image
Also artifact can be produced, accordingly, it would be desirable to ensure the stability and uniformity of system in image scanning.It can lead in CT system of the present invention
Cross sensor unit 107 and obtain the temperature information related with metallic matrix to detector 104.Sensor unit 107 can include
The temperature sensor inside detector 104 is arranged at, for obtaining the temperature information inside detector.Sensor unit 107
The temperature sensor being arranged on metallic matrix can be included, the temperature information for obtaining metallic matrix, detector 104 is installed
In the inside of metallic matrix.
In certain embodiments, the temperature information that CPU 120 can be obtained according to sensor unit 107 judges
Whether detector 104 or metallic matrix are in target temperature range.In certain embodiments, target temperature range is referred to
Detector 104 or metallic matrix are capable of the temperature range or some default actual temp scope of normal work.Tool
Body, target temperature range can include first object temperature range and the second target temperature range.First object temperature range
Can make the temperature range of the normal work of detector 104, or some is directed to the default actual temp scope of detector 104.
Second target temperature range can make the temperature range of metallic matrix normal work, or some is default for metallic matrix
Actual temp scope.In certain embodiments, first object temperature range can be equal to the second target temperature range.In some realities
Apply in example, first object temperature range can be not equal to the second target temperature range.In certain embodiments, first object temperature
Scope refers to the ceiling temperature of first object temperature range and the upper limit of the second target temperature range equal to the second target temperature range
Temperature is identical, and the lower limit temperature of first object temperature range is identical with the lower limit temperature of the second target temperature range.First
Target temperature range is not equal to the ceiling temperature and the second target temperature that the second target temperature range refers to first object temperature range
The ceiling temperature of scope is different, and/or first object temperature range lower limit temperature and the lower limit temperature of the second target temperature range
Degree is different.
CPU 120 can control the temperature of detector 104 by thermostat unit 106.Center processing is single
Member 120 is adjusted the internal temperature of detector 104 to first object temperature range by thermostat unit 106, metallic matrix
225 temperature is adjusted to the second target temperature range.Thermostat unit 106 can include some cooling units and heating is single
Member.In certain embodiments, cooling unit can be fan.Air outside metallic matrix can be blown to metallic matrix by fan
Inside, to reduce the temperature of detector.In certain embodiments, heating unit can be fire-bar, for heating metallic matrix
Raise temperature.In certain embodiments, fire-bar can be copper sheet, its scattering device in the inside edge position of metallic matrix,
The heat that the current adjustment section copper sheet of copper sheet is produced is flowed through during work by changing.
Fig. 2 be embodiment of the present invention in detector, metallic matrix with thereon heating, the layout of cooling unit.
Detector array 225 includes scintillation crystal, the ASIC (Application positioned at scintillation crystal lower floor arranged with array way
Specific Integrated Circuit) chip and scintillation crystal chip substrate.Detector 104 is arranged on Metal Substrate
Inside body 225.In the present embodiment, based on the existing good radiating of aluminium and conducting effect, the material selection gold of detector carriage
Belong to aluminium or aluminium alloy.
For the ease of adjusting the temperature of detector, present invention detector used also includes being arranged on the framework of metallic substrates 225
On fire-bar 221,222,223,224 as heating unit, be arranged on detector carriage side fan 201,202,203,
204th, 205,206 it is used as cooling unit.It will be appreciated by those skilled in the art that the quantity and distribution of heating unit and cooling unit
Mode is not limited to the mode that embodiment is provided in present disclosure book, and the quantity and distribution mode of heating unit and cooling unit can
To change according to specific circumstances.
Include outside matrix towards the front of CT bulbs and dorsad the reverse side of CT bulbs and positioned at obverse and reverse it
Between side, the first temperature sensor be arranged at side.On metallic matrix side, it is corresponding with fire-bar position be provided with it is many
Individual first temperature sensor 211,212,213,214,215.Specifically, setting temperature sensor 215 outside metallic matrix, use
In acquisition metallic matrix outside air temperature；Temperature sensor 214 is set near fire-bar 224, for obtaining fire-bar 224
Ambient air temperature；Temperature sensor 211 is set near fire-bar 221, for obtaining the surrounding metal substrate of fire-bar 221
Temperature；Temperature sensor 212, the temperature for obtaining the surrounding metal substrate of fire-bar 222 are set near fire-bar 222；
Fire-bar 223 nearby sets temperature sensor 213, the air themperature for obtaining fire-bar 223 and its neighbouring metallic substrates.
Detector includes several detector cells, with towards the first face of CT bulbs and dorsad the second face of CT bulbs, and described the
Two temperature sensors are arranged at the second face.For example, the second face inside detector 104 back to CT bulbs is also provided with second temperature
Sensor 216, for obtaining the internal temperature of detector 104.In certain embodiments, the second temperature sensor can also be set
It is placed on the side between the first face of detector cells, the second face.
It is pointed out that fire-bar used in the present embodiment is copper sheet, its scattering device is in the inner side of metallic matrix
Marginal position, flows through the heat that the current adjustment section copper sheet of copper sheet is produced by changing during work.When need to detector carry out
During heating, the direction of air-flow 230 as shown in Figure 2, the air (18-25 DEG C) of extraneous lower temperature arrives first at metallic matrix front end
Fire-bar 224 carry out one-level heating, temperature now can be increased to 28 ± 2 DEG C.The air heated by one-level can divide
Two grades of heating are not carried out in fire-bar 221,222,223, air themperature now can be raised as 36 ± 1 DEG C.Detector and sky
Heat exchange is constantly carried out between gas to be increased to the temperature of detector 104 in default target temperature range.Work as detector
, it is necessary to carry out radiating and cooling to detector when causing temperature due to absorption X-ray more than target zone higher limit.For example, plus
Hot bar is stopped, the air circulation inside and outside fan running increase metallic matrix, so as to accelerate detector and extraneous Cryogenic air
Heat exchange, reduce detector 104 temperature.Using electric heating bar (copper sheet) as heating unit in the embodiment of the present invention,
But heating unit can also be used as using other modes.Using fan (air-cooled) as cooling unit in the embodiment of the present invention, but
Cooling unit can also be used as using other modes.
The flow chart of the imaging method using CT system of the present invention is illustrated in figure 3, is specially：
In step 301, the temperature that CPU 120 is arranged inside detector 104 by sensor unit 107 is passed
Sensor 216 obtains the temperature inside detector 104, and judges according to default first object temperature range the temperature of detector 104
Degree produces the first result whether in first object temperature range.First result can include "Yes" or "No", or " normal "
Or " abnormal ".If the temperature inside detector 104 is in first object temperature range, the first result produced be for
"Yes" or " normal ", the i.e. internal temperature of detector 104 are normal, if the temperature inside detector 104 is in first object temperature model
Enclose outer, then the first result produced is "No" or " abnormal ", i.e. the internal temperature of detector 104 is abnormal.
In step 302, CPU 120 is arranged at 225 TEMP on metallic matrix by sensor unit 107
Device 211,212,213 obtains the temperature of metallic matrix 225, and judges metallic matrix according to default second target temperature range
225 temperature produces the second result whether in the second target temperature range.Second result can include "Yes" or "No",
Or " normal " or " abnormal ".In certain embodiments, first object temperature range can be equal to the second target temperature range.
In some embodiments, first object temperature range can be not equal to the second target temperature range.If the temperature of metallic matrix 225
In the second target temperature range, then the second result produced is "Yes" or " normal ", i.e. the temperature of metallic matrix 225 is normal.
If the temperature of metallic matrix 225 is outside the second target temperature range, the second result produced is "No" or " abnormal ",
That is the temperature of metallic matrix 225 is abnormal.
In step 303, CPU 120 judges whether the first result and the second result are equal.If detector 104
Internal temperature and the temperature of metallic matrix 225 are all normal, then the first result is equal to the second result.If the internal temperature of detector 104
All abnormal with the temperature of metallic matrix 225, then the first result is equal to the second result.If the internal temperature of detector 104 is normal, gold
The category temperature of matrix 225 is abnormal, then the first result is not equal to the second result.If the internal temperature of detector 104 is abnormal, metal
The temperature of matrix 225 is normal, then the first result is not equal to the second result.
If the first result and the second result are unequal, illustrate that exception occurs in sensor unit 107, into step 304, in
Central Processing Unit 120 control thermostat unit 106 close some or all heating units (such as fire-bar 221,222,223,
And/or 224), open some or all cooling units (such as fan 201,202,203,204,205, and/or 206), make CT system
Temperature reduction, in order to avoid high temperature detector 104.
If the first result and the second result are equal, in step 305, CPU 120 passes through thermostat unit
106 adjust the internal temperature of detector 104 to first object temperature range, and the temperature of metallic matrix 225 is adjusted to the second mesh
Mark in temperature range.If specifically, temperature is less than the lower limit of target temperature range, beginning to warm up detector 104.Center processing
Unit 120 will increase the operating power of fire-bar 221,222,223, and/or 224, either enable standby fire-bar or drop
The operating power of low fan 201,202,203,204,205, and/or 206, or close a number of fan.If temperature is high
In the upper limit of target temperature range, then detector 104 is begun to cool down.CPU 120 will increase fan 201,202,
203rd, 204,205, and/or 206 operating power, or enable standby fan, or reduction fire-bar 221,222,223 and/
Or 224 operating power, or close a number of fire-bar.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included in the scope of the protection.
Claims (10)
1. a kind of CT system, it is characterised in that including：
CT bulbs；
Detector module, is oppositely arranged with CT bulbs, and the detector module includes matrix, the detector being arranged in matrix；
Temperature sensor, including it is arranged at the second temperature biography of the first temperature sensor unit and intrinsic silicon outside matrix
Sensor cell.
2. CT system as claimed in claim 1, it is characterised in that including towards the front of CT bulbs and dorsad outside described matrix
The reverse side of CT bulbs and the side between obverse and reverse, first temperature sensor are arranged at side.
3. CT system as claimed in claim 1, it is characterised in that the detector includes several detector cells, with towards CT
Second face of the first face of bulb and dorsad CT bulbs, the second temperature sensor is arranged at the second face.
4. CT system as claimed in claim 1, it is characterised in that the second temperature sensor is arranged at the first of detector cells
On side between face, the second face.
5. CT system as claimed in claim 1, it is characterised in that the detector includes several detector cells, and described several
The side of detector cells forms cambered surface.
6. CT system as claimed in claim 1, it is characterised in that it is single that the thermostat unit includes one or more heating
First and one or more cooling units.
7. CT system as claimed in claim 6, further comprises：
The thermostat unit is used for the temperature for judging the detector whether in the first object temperature range, and produces
Raw first result；
The thermostat unit is used for the temperature for judging the metallic matrix whether in the range of the second temperature, and produces
Second result.
8. CT system as claimed in claim 6, it is characterised in that if first result is equal to second result, and
And the temperature of the detector is higher than the upper limit of the first object temperature range, then begins to cool down the detector；If institute
The first result is stated equal to second result, and the temperature of the detector to be less than under the first object temperature range
Limit, then begin to warm up the detector.
9. CT system as claimed in claim 6, it is characterised in that if first result is equal to second result, and
And the temperature of the metallic matrix is higher than the upper limit of second target temperature range, then begins to cool down the detector；If
First result is equal to second result, and the temperature of the metallic matrix is less than second target temperature range
Lower limit, then begin to warm up the detector.
10. a kind of CT system temprature control method, it is characterised in that including：
The temperature of detector is obtained, the temperature of the detector is judged whether in first object temperature range, and produces first
As a result；
The temperature of metallic matrix is obtained, the temperature of the metallic matrix is judged whether in the second target temperature range, and produce
Second result；
If first result is equal to second result, and the temperature of the detector is higher than the first object temperature
The upper limit of scope, then begin to cool down the detector；And
If first result is equal to second result, and the temperature of the detector is less than the first object temperature
The lower limit of scope, then begin to warm up the detector.
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| CN201710525077.4A CN107307878B (en) | 2017-06-30 | 2017-06-30 | CT system temperature control method |
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| CN201710525077.4A CN107307878B (en) | 2017-06-30 | 2017-06-30 | CT system temperature control method |
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| CN107307878B CN107307878B (en) | 2020-12-25 |
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| CN107981881A (en) * | 2017-11-24 | 2018-05-04 | 上海联影医疗科技有限公司 | CT system and its detection device |
| CN109199425A (en) * | 2018-09-29 | 2019-01-15 | 天津金曦医疗设备有限公司 | A kind of mobile plate CT imaging system for the detection of brain soft tissue |
| CN112741642A (en) * | 2020-12-28 | 2021-05-04 | 明峰医疗系统股份有限公司 | Temperature balancing device of CT detector |
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| Publication number | Publication date |
|---|---|
| CN107307878B (en) | 2020-12-25 |
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