CN108451541A - A kind of Dynamic CT test body mould - Google Patents
A kind of Dynamic CT test body mould Download PDFInfo
- Publication number
- CN108451541A CN108451541A CN201810095864.4A CN201810095864A CN108451541A CN 108451541 A CN108451541 A CN 108451541A CN 201810095864 A CN201810095864 A CN 201810095864A CN 108451541 A CN108451541 A CN 108451541A
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- China
- Prior art keywords
- bellows
- liquid
- liquid storage
- vibration exciter
- body mould
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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]
-
- 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
- A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
Abstract
The invention discloses a kind of Dynamic CT test body moulds, include the heart rate signal generator being connected by liquid pipe and phantom scanning device, liquid pipe is used for transmission liquid, heart rate signal generator is made of modality vibration exciter, tightening platform and liquid storage bellows, liquid storage bellows is formed by being blocked up under stifled and bellows on spring, cavity, bellows, it blocks up on bellows and is connected with the liquid pipe, fixed the modality vibration exciter and liquid storage bellows by tightening platform；When modality vibration exciter works, by under bellows block up by up and down motion displacement pass to spring make its compress or diastole, volume in cavity changes correspondingly, stored liquid generates movement by squeezing out and sucking back in liquid storage bellows, to simulate blood motion, while simulating atrial ventricle's expansion accordingly and shrinking deformation；Phantom scanning device includes liquid storage ware and support plate.The present invention has many advantages, such as inexpensive, simple in structure, high certainty of measurement.
Description
Technical field
The present invention relates to CT scan (CT) systems, and in particular to one kind is used for testing CT system dynamic
The body mould of energy.
Background technology
In recent years, the development of CT technologies is swift and violent, is important one of imaging technique, but the electronics control system and machine of CT machines
Tool structure is sufficiently complex, additionally uses complicated data processing software, therefore, there are many factor for influencing picture quality.Present
Body mould lays particular emphasis on morphologic resolution ratio more, but the organ of human body is mostly movement, and be it is uncontrolled, then, Yi Zhongyou
Imitating rational dynamic CT body mould and studying CT diagnostic image qualities for us has important meaning.
And compared with the fast development of cardiac CT scan, the quality evaluation of significance of coronary angiography with multi-slice spiral CT and quality are protected
The tool development quite lag of card.That the tool of cardiac imaging quality not can be evaluated accordingly, without suitably detecting body mould, face
Bed doctor cannot objectively evaluate the quality of the quality of image in coronary imaging.Therefore, a kind of suitable dynamic of design
CT body mould is of crucial importance.
Invention content
Purpose of the invention is to overcome the shortcomings in the prior art, meets the clinical needs of CT dynamics, takes into account it efficiently
Property and accuracy, provide a kind of inexpensive, simple in structure, high certainty of measurement Dynamic CT test body mould, and can be by the heart of simulation
Rate signal is shown by the fluctuation up and down of liquid.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of Dynamic CT test body mould includes the heart rate signal generator being connected by liquid pipe and phantom scanning device, institute
It states liquid pipe and is used for transmission liquid, the heart rate signal generator is made of modality vibration exciter, tightening platform and liquid storage bellows, institute
It states liquid storage bellows to be formed by blocking up under stifled and bellows on spring, cavity, bellows, the spring is for simulating cardiac muscle group
It knits, cavity blocks up under bellows and is connected by screw-thread fit with modality vibration exciter mover end, blocked up on bellows for simulating chambers
It is connected with the liquid pipe, is fixed the modality vibration exciter and liquid storage bellows by the tightening platform, limits storage
The freedom of motion of liquid bellows ensures that liquid storage bellows is only being drawn high and compression direction movement；When modality vibration exciter works,
Up and down motion displacement is passed into spring make that it is compressed or diastole, the volume in cavity change correspondingly by being blocked up under bellows, stores up
Stored liquid generates movement by squeezing out and sucking back in liquid bellows, to simulate blood motion, while simulating the atrium heart
Room expansion accordingly and contraction deformation；
The phantom scanning device is made of organic glass, including liquid storage ware and support plate, and liquid storage ware shape is in oblate column
Shape, the side of liquid storage ware are equipped with the interface being connected with the liquid pipe, and the top of liquid storage ware is equipped with venthole, the support plate side
Equipped with horizontal calibrating device.
Further, the radius of the circular flat of the liquid storage ware is 140~160mm, and thickness is 90~110mm.
Further, liquid selective barium sulfate solution or Biodine.
Compared with prior art, advantageous effect caused by technical scheme of the present invention is：
The present invention controls the amplitude and speed of liquid oscilaltion by adjusting the size of input voltage and frequency.The body mould is not
Only can simulation heart very well motion conditions, be also used as the quality evaluation and quality assurance of MSCT coronary imagings
Tool, for example the influence factors such as heart rate, sweep speed, algorithm for reconstructing can be detected.It can rationally be utilized by controlling heart rate
Sweep parameter can detect the cardiac motion state for being most suitable for scanning, coronarius at image quality so as to be obviously improved
Amount, improves the success rate of cardiac work up；The high efficiency and accuracy of diagnosis are improved, and fully take into account CT dynamic clinics to need
It wants.
Description of the drawings
The overall structure diagram of Fig. 1 apparatus of the present invention.
Fig. 2 is the structural schematic diagram of phantom scanning device.
Fig. 3 is the structural schematic diagram of heart rate signal generator.
Fig. 4 is TDA7294 typical application circuit schematic diagrames.
Fig. 5-1 to Fig. 5-3 be after body mold device connects caused by liquid float up and down effect diagram.
Fig. 6 is heart rate signal generator input signal.
Reference numeral：1- phantom scanning devices；2- heart rate signal generators；3- liquid pipes；4- interfaces；5- ventholes；6- water
Flat calibrating installation；7- modality vibration exciters；8- liquid storage bellowss；9- tightening platforms；
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, the present invention protects a kind of Dynamic CT test body mould, includes the heart rate letter being connected by liquid pipe 3
Number generator 2 and phantom scanning device 1, liquid pipe 3 are used for transmission liquid, and heart rate signal generator 2 is by modality vibration exciter 7, fastening
Platform 9 and liquid storage bellows 8 form.Modality vibration exciter 7 selects the MS-20 of YMC companies in the present embodiment；It is big with displacement
(± 5mm), contribute sufficient (>=20N), be swift in response, be small, is light-weight, wide frequency range (0-6KHz), it is reasonable for structure, can
The feature high by property.7 basic functional principle of modality vibration exciter be current－carrying conductor in magnetic field will by electromagnetic force, inside have
Rare-earth Nd-Fe-B permanent magnetic material provides stabilizing magnetic field, can cause as mover so the current direction and size of input change
Vibrations head generate different change in displacement.Liquid storage bellows 8 is formed by being blocked up under stifled and bellows on spring, cavity, bellows,
Wherein spring-loaded floating die pseudocardia musculature, cavity simulate chambers.It is blocked up under bellows and passes through screw thread with 7 mover end of modality vibration exciter
Cooperation is fixed together, and blocks up on bellows and is connected with liquid pipe 3.It, will be upper by being blocked up under bellows when modality vibration exciter works
Lower moving displacement, which passes to spring, makes its compression or diastole, the volume in cavity change correspondingly, stored by liquid storage bellows 8
Liquid drives liquid motion in rigid conduit by squeezing out and sucking back, and to simulate blood motion, while simulating atrial ventricle's phase
The expansion and contraction deformation answered.It is using tightening platform 9 that modality vibration exciter 7, liquid storage bellows 8 etc. is fixed together, define storage
8 freedom of motion of liquid bellows ensures that it is only moved in the direction for stretching and compressing, reduces the influence that noise is brought with vibrations,
System stability and reliability are improved on the whole.
Phantom scanning device material and specification：Phantom scanning device by organic glass (Polymethylmethacrylate,
PMMA it) constitutes, including liquid storage ware and support plate；Liquid storage ware shape is in oblate column, and disk radius about 150mm, thickness is about
100mm is wholely set tablet in bottom and is used as support plate；The side wall of liquid storage ware is equipped with interface 4, is believed by liquid pipe 3 and heart rate
Number generator is connected, and support plate side sets that there are one horizontal calibrating devices 6, between carrying out CT scan, by phantom scanning device
Level is put, acquired data is made to have more accuracy.It is equipped with venthole 5 on liquid storage ware top, for balancing phantom scanning
Air pressure in device keeps liquid injection phantom scanning device more convenient, and the effect that floats up and down becomes apparent from.In order to enable liquid and sky
The resolution ratio of gas distinguishes apparentization, while making liquid close to blood of human body, and the present embodiment selects barium sulfate solution or contains
The solution of iodine.
It is designed about heart rate signal generator driving circuit：Since the driving capability of microprocessor DAC output pins is not strong,
Heart rate signal generator can not be driven, therefore needs to design after power amplifier amplifies signal and inputs pulse condition generator again.This implementation
The driving circuit core that example is related to is the TDA7294 amplification chips produced by ST Microelectronics.Before the chip internal circuits
Grade is using low noise, the bipolar transistor circuit of low distortion, and circuit final stage is using high pressure resistant, high current DMOS pipe buffering is defeated
Go out, thus it had both had the advantages of bipolar circuit, while having had both strong excellent of metal-oxide-semiconductor high-voltage large current driving capability
Gesture has the characteristics such as high pressure resistant, low noise, low distortion, and has mute idle function, short circuit current and overheating protection work(
Energy.
Fig. 4 is the typical application circuit of TDA7294, is mainly used in the amplification of audio signal, frequency range 30Hz-
20kHz.With self-protection module, i.e., temperature overheating or when too big electric current can self blockade prevent damage chip.Outside the circuit
It is as follows to enclose element function：R1：Amplifier input impedance；R2、R3：Codetermine amplifier gain；R4、C4：Codetermine circuit
ST-BY time constants；R5、C3：Codetermine circuit MUTE time constants；C1：Cut-off is arranged in input coupling capacitance together with R1
Lower-frequency limit；C2：Feedback capacity makes direct current signal completely feed back；C6、C7、C8、C9：Electrical power by-pass capacitance.In addition Fig. 4 circuits
In other English marks be：VM：Mute control terminal；VSTBY：Opportunity awaiting control for linear end；MUTE：It is mute；STBY：It is standby；THERMAL
SHUTDOWN：Heat shutoff；BOOTSTRAP：Front- end Developing Tool packet.
By above description, Dynamic CT test body mould is made to realize the movement similar to sinusoidal form, simulates paradoxical expansion
Adjustable, the changes in heart rate ranging from 0-100bpm with the ratio of diastole, can effectively simulation cardiac pumping activity.
Concrete operations flow is as follows：
First, liquid storage bellows is filled into liquid, while phantom scanning device is filled into a part of liquid (highly about
150mm), the two is connected with liquid pipe, it is noted that standing or removing bubble by draught head.Then, heart rate signal is sent out
Raw device is connected with power supply, meanwhile, to its input sine wave shape, setting voltage value and frequency values, input signal are shown in such as Fig. 6, at this time
Modality vibration exciter vibrates, and causes liquid in phantom scanning device to fluctuate up and down, as shown in Fig. 5-1 to 5-3, passes through meter
The speed and amplitude for calculating liquid fluctuation in body mould, to preferably detect the picture quality under different change rates.
Preferably, which can change the change rate of liquid in containers movement by the following two kinds mode：
Liquid in phantom scanning device remains unchanged, and changes the amplitude and frequency of input waveform, to change vibrator
The oscillation of generation causes the change rate of liquid in phantom scanning device to change.
Since the liquid storage ware of phantom scanning device is oblate cylindricality, the area of each cross section is different, and can be kept
The duplication of input waveform and frequency change the amount of liquid in body mould, because area is different, the change rate of liquid motion is not
With.In addition change rate influence to the quality of image of the test body mould of the present invention in addition to that can detect heart movement, can also examine
Thickness, sweep speed, different heart movement degree (ratio in systole phase and diastole), algorithm for reconstructing are surveyed to the shadow of image quality
It rings.
The present invention is not limited to embodiments described above.Above the description of specific implementation mode is intended to describe and say
Bright technical scheme of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (3)
1. a kind of Dynamic CT test body mould, which is characterized in that include that the heart rate signal generator being connected by liquid pipe and body mould are swept
Imaging apparatus, the liquid pipe are used for transmission liquid, and the heart rate signal generator is by modality vibration exciter, tightening platform and liquid storage ripple
Pipe forms, and the liquid storage bellows is formed by being blocked up under stifled and bellows on spring, cavity, bellows, and the spring is for simulating
Heart muscle tissue, cavity are used to simulate chambers, block up under bellows and be connected by screw-thread fit with modality vibration exciter mover end,
It blocks up on bellows and is connected with the liquid pipe, fixed the modality vibration exciter and liquid storage bellows by the tightening platform,
To limit the freedom of motion of liquid storage bellows, ensure that liquid storage bellows is only being drawn high and compression direction movement；When mode swashs
When the device that shakes works, up and down motion displacement is passed into spring by being blocked up under bellows it is made to compress or diastole, the volume in cavity
It changes correspondingly, stored liquid generates movement by squeezing out and sucking back in liquid storage bellows, to simulate blood motion, simultaneously
It simulates atrial ventricle's expansion accordingly and shrinks deformation；
The phantom scanning device is made of organic glass, including liquid storage ware and support plate, and liquid storage ware shape is in oblate column, storage
The side of liquid ware is equipped with the interface being connected with the liquid pipe, and the top of liquid storage ware is equipped with venthole, and the support plate side is equipped with
Horizontal calibrating device.
2. a kind of Dynamic CT test body mould according to claim 1, which is characterized in that the half of the circular flat of the liquid storage ware
Diameter is 140~160mm, and thickness is 90~110mm.
3. a kind of Dynamic CT test body mould according to claim 1, which is characterized in that the liquid selective barium sulfate solution or
Biodine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095864.4A CN108451541A (en) | 2018-01-31 | 2018-01-31 | A kind of Dynamic CT test body mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095864.4A CN108451541A (en) | 2018-01-31 | 2018-01-31 | A kind of Dynamic CT test body mould |
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| Publication Number | Publication Date |
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| CN108451541A true CN108451541A (en) | 2018-08-28 |
Family
ID=63238416
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| CN201810095864.4A Pending CN108451541A (en) | 2018-01-31 | 2018-01-31 | A kind of Dynamic CT test body mould |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109528224A (en) * | 2019-01-04 | 2019-03-29 | 中国人民解放军陆军军医大学第二附属医院 | Simulate angiocardiokinetic CT image quality detection body mould, control method and quality determining method |
| CN109633504A (en) * | 2018-12-14 | 2019-04-16 | 天津大学 | A kind of compound magnetic resonance test body mould system of static-dynamic state |
| CN109782203A (en) * | 2018-12-14 | 2019-05-21 | 天津大学 | A kind of dynamic magnetic resonance test body mould system |
| CN109782202A (en) * | 2018-12-14 | 2019-05-21 | 天津大学 | A kind of static state magnetic resonance test body modular system |
| CN110720898A (en) * | 2019-10-14 | 2020-01-24 | 浙江大学 | Arteriovenous vascular access stenosis detection system based on auscultation acoustic signal MUSIC power spectrum characteristics |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633504A (en) * | 2018-12-14 | 2019-04-16 | 天津大学 | A kind of compound magnetic resonance test body mould system of static-dynamic state |
| CN109782203A (en) * | 2018-12-14 | 2019-05-21 | 天津大学 | A kind of dynamic magnetic resonance test body mould system |
| CN109782202A (en) * | 2018-12-14 | 2019-05-21 | 天津大学 | A kind of static state magnetic resonance test body modular system |
| CN109633504B (en) * | 2018-12-14 | 2020-05-15 | 天津大学 | Dynamic-static composite magnetic resonance test body model system |
| CN109782203B (en) * | 2018-12-14 | 2020-07-31 | 天津大学 | Dynamic magnetic resonance test body model system |
| CN109528224A (en) * | 2019-01-04 | 2019-03-29 | 中国人民解放军陆军军医大学第二附属医院 | Simulate angiocardiokinetic CT image quality detection body mould, control method and quality determining method |
| CN110720898A (en) * | 2019-10-14 | 2020-01-24 | 浙江大学 | Arteriovenous vascular access stenosis detection system based on auscultation acoustic signal MUSIC power spectrum characteristics |
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