CN104306014B - A kind of digitlization update device of film type panorama gear division X-ray machine - Google Patents

Abstract

The digitlization update device of a kind of film type panorama gear division X-ray machine, belongs to Medical Instruments digitizing technique field.It includes film magazine velocity scanning device, x-ray detector based on TDI CCD, and vision signal AD conversion uploads device, PC display platform and power supply.The motion of existing film type panorama gear division X-ray machine scanning film magazine is scanned with film magazine velocity scanning device, then rate signal scanning obtained is passed to x-ray detector based on TDI CCD, and the motor message after process then drives the transfer of the internal charge of sensor TDI CCD；The signal entrance vision signal AD conversion of x-ray detector output is uploaded device and is carried out the analog-to-digital conversion of signal and be transferred to PC platform, and the file after analog-to-digital conversion is stored and shows by PC platform.Domestic existing film gear division panorama machine is digitized upgrading by the digitlization update device of film type panorama gear division X-ray machine that the present invention provides, the most cost-effective, also can provide technical support with the cooperation of domestic existing film type gear division panorama machine manufacturer.

Description

A kind of digitlization update device of film type panorama gear division X-ray machine

Technical field

The digitlization update device of a kind of X-ray machine, particularly a kind of film type panorama gear division X are the present invention relates to The digitlization update device of line machine.

Background technology

Gear division panorama x-ray imaging device is widely used imaging device in hospital's oral cavity diagnosis, can be to human body Denture shoots, and obtains the layer radiography image of tooth, periodontium and adjacent anatomical structures thereof.Root According to the difference of x-ray receiver, gear division panorama x-ray imaging device can be divided into film cassette Formula X line panorama machine, IP board-like imaging x-ray panorama machine and charge-coupled image sensor Formula X line panorama machine.Film cassette Formula X line panorama machine Being the most traditional imaging mode, it is made up of intensifying screen, photographic film and magazine, need through development, fixing, The step rinsed and dry obtains image, and operation is complicated and has certain chemical contamination；IP board-like imaging x-ray Panorama machine belongs to a kind of imaging mode indirectly, obtains digitized map after needing to be scanned by IP plate by laser scanner Picture, although improve efficiency without developing a film, but operation is still complicated, the longest, and dose of radiation is big；Digitlization X-ray panorama machine can be directly changed into view data the x-ray received, it is not necessary to darkroom chemical treatment, imaging Speed is fast, imaging resolution is higher, and dose of radiation is less.

At present, domestic gear division panorama x-ray imaging device is in the stage of update, and being digitized into seems development Trend, large, medium and small hospital mainly takes the mode of external import, and most small-middle hospital still uses tradition Film cassette Formula X line panorama machine.The digitlization update device of the X-ray machine that the present invention provides can be to domestic existing Some film cassette Formula X line panorama machines or IP board-like imaging x-ray panorama machine are digitized upgrading, greatly Cost-effective.

Summary of the invention

For existing hospital film type panorama gear division X-ray machine being digitized upgrading, it is characterised in that: bag Including film magazine velocity scanning device, x-ray detector based on TDI CCD, vision signal AD conversion uploads dress Put, PC display platform and power supply；Existing film type panorama gear division X is scanned with film magazine velocity scanning device The motion of line machine scanning film magazine, the rate signal then scanning obtained is passed to x-ray based on TDI CCD Detector, its acp chip CPLD processes for motor message, and concrete treating method is to pass through CPLD Inside programming realizes.The motor message of grating scale output is pulse signal, is specifically that machinery film magazine is often passed by One pulse of output of 4um grating scale；The pixel of CCD is 48*48um, i.e. CCD internal charge shifts once Pass by 48um, the most only makes the film magazine 48um that often passes by produce pulse-triggered CCD electric charge transfer one Secondary, the electric charge transfer of film movements and CCD just can be made to synchronize.Treating method is exactly direct to grating scale Output signal carries out 12 times of countings so that grating scale triggers pulse and become 48um from original mono-pulse of 4um One pulse；Secondly because film magazine motion uses stepper motor, the most necessarily have shake, so make light The interference that grid chi output signal is shaken, such signal handler part also to have one to disappear to tremble module.Place Motor message after reason then drives the transfer of the internal charge of sensor TDI CCD, for film magazine motor message Drive the transfer of CCD internal signal, then need to produce while CCD drives signal in CPLD programming to retain The controlled input of transfer gate-control signal, remaining ccd signal driver is then such as conventional definite integral driver (Liu Youjun, Lu Jianrong, Liu Rongli, Yu Ran. the time of integration adjustable TDI-CCD drive circuit: China is practical new Type patent .201120323369.8 [p] .2012.), film movements signal controls CCD electric charge vertical transitions, with Reach motion and shift, with TDI CCD electric charge, the purpose mated completely；The tooth of x-ray detector output thereafter Tooth useful signal enter vision signal AD conversion upload device carry out signal analog-to-digital conversion and be transferred to PC put down Platform, the PC platform bin file to obtaining after analog-to-digital conversion carries out bmp form storage and shows；Power supply Digitlization update device for whole film type panorama gear division X-ray machine provides required voltage.

The digitlization update device of the film type panorama gear division X-ray machine that the present invention provides meets clinical diagnosis requirement, Domestic existing film or IP board-like gear division panorama machine can be digitized upgrading, and have pollution-free, become As speed is fast, the advantages such as image level is more rich, can be directly used for film type panorama gear division X of small-middle hospital Line machine improves, the most cost-effective.

Panorama gear division X-ray machine is based on pantomography principle design, and pantomography is according to gear division The anatomic characteristic of Maxillary region, utilizes layer radiography principle and slit photography principle and a kind of single exposure of designing The method for imaging that denture can be projected on a film (Han Feng talks, Zhu Xianfeng. Medical imaging equipments (second edition) [M]. Beijing: People's Health Publisher, 2010:12-37), thus require film type panorama x-ray The motion of Bigpian box must be mutually matched with the rotation of C-arm just can make imaging point on the dental arch curve of people, The teeth oral cavity panorama sketch only in this way obtained could be clear.The digitlization upgrading that the present invention mentions, its core is just It is to use TDI CCD as photoelectric sensor, directly the x-ray of reception can be changed into the signal of telecommunication, the design Then require the speed dress that can make the present invention consistent with the translational speed of film that TDI CCD internal signal shifts The panorama gear division X-ray machine put and improved mates completely, thus obtains clearly digitized image.Therefore adopt Scan the motion of film with grating scale, and then trigger the transfer of TDI CCD internal signal so that CCD electric charge Transfer velocity is completely the same with film movements speed.

The grating scale output signal cycle is 4um light of often passing by the time of its detection object of which movement 4um, i.e. film Grid chi one complete pulse of output, adds that mechanical movement has the possibility of shake, so for the light directly obtained Grid chi signal first has to carry out de-jitter.The most then will according to the electric charge of TDI CCD shift every time away from From 48um, grating scale output signal is carried out 12 times of countings, the most just make film often move 48um export one Pulse signal, pulse signal is then used for triggering the electric charge transfer of TDI CCD internal signal, reaches film and TDI CCD motion is completely the same；Key dithering and counting are processed and are realized by CPLD chip programming.

Existing film cassette Formula X line panorama machine or IP board-like imaging x-ray panorama machine are carried out numeral by the present invention Change upgrading to have the advantage that and beneficial effect: the digitlization upgrading of the panorama gear division X-ray machine that the present invention provides Device makes that X-ray exposure dosage is little, exposure latitude big, without implying chemical treating process, without laser Scanner, dynamic range of images are wide.And the digitlization upgrading of the panorama gear division X-ray machine of present invention offer Domestic existing film cassette Formula X line panorama machine or IP board-like imaging x-ray panorama machine can directly be carried out by device Digitlization upgrading, has greatly saved cost, and to make original film type, IP plate be gear division panorama X Line machine is recycled, and meets the trend of medical digitisation video.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the digitlization update device of the X-ray machine that the present invention provides.

Fig. 2 is film type gear division oral panorama X-ray apparatus simple diagram and grating scale fixed form schematic diagram.

Fig. 3 is grating scale schematic diagram.

Fig. 4 is x-ray detector schematic diagram based on TDI CCD.

Fig. 5 is signal processing circuit.

Fig. 6 is that TDI CCD drives signal schematic representation.

Fig. 7 is high-speed data acquisition card FCFR-USB9825 schematic diagram.

In figure: 1. elevator carriage；2. rotate transverse arm；3. film magazine；4. grating scale position；6. magnetic grid bar；7. Read head；8.X line occurring source.

Detailed description of the invention

The digitlization update device of the film type panorama gear division X-ray machine that the present invention provides includes film magazine velocity scanning Device, x-ray detector based on TDI CCD, vision signal AD conversion uploads device, and PC shows flat Platform and power supply.Structured flowchart such as Fig. 1 institute of the digitlization update device of film type panorama gear division X-ray machine Show.Including five parts, film magazine velocity scanning device, grating scale is used to scan film magazine movement velocity as core； X-ray based on TDI CCD detection device, main employing CPLD inside programming realizes: processes grating scale and passes Defeated rate signal, CCD driver' s timing etc.；Vision signal AD conversion uploads device, mainly completes signal Analog-to-digital conversion, the work such as host computer transmission；PC shows, it is achieved the work such as the image of computer shows, storage； Power supply, supplies each road modular power source.

Film magazine velocity scanning device is mainly made up of grating scale, logical grating scale scanning film type panorama gear division x-ray The film movements of machine obtains its rate signal, and detailed description of the invention is to use grating scale to be fixed on film type panorama tooth Section's X-ray machine frame for movement film magazine position as in figure 2 it is shown, grating ruler reading head is fixed on c-type turning arm, Grating scale magnetic grid bar is fixed on film magazine position, so that it moves with film magazine, grating scale is as shown in Figure 3. Read head reads film movements and exports its rate signal U1, and rate signal U1 feeds X based on TDI CCD Line detector.

Fig. 2 includes eight parts, elevator carriage 1, is mainly used in the lifting of frame for movement；Rotate transverse arm 2, Being C-arm, carrying x-ray occurs and receives device；Film magazine 3, the film for film type X-ray machine loads； Grating scale position 4, for the general installation site of grating scale；Magnetic grid bar 6, is grating scale magnetic grid bar, installs It is marked with scale in film magazine, calculates for speed；Read head 7, is grating ruler reading head, and read head is inswept Magnetic grid bar 6, obtains rate signal by scale inswept in the unit interval；X-ray occurring source 8, is used for producing X-ray.As shown in Figure 4, its acp chip EMP7512 programming produces CCD and drives x-ray detector schematic diagram Signal, the driving signal driving signal such as Fig. 6, TDI-CCD to need includes that eight road vertical transfer clocks (are designated as P1AVa, P1BVa, P2AVa, P2BVa, P1AVb, P1BVb, P2AVb, P2BVb), eight tunnel levels Transfering clock (P1AHa, P1BHa, P2AHa, P2BHa, P1AHb, P1BHb, P2AHb, P2BHb), Two-way reset pulse (is designated as RGa and RGb), two-way transfer gate-control signal (being designated as TGa and TGb), with And two-way summation gate-control signal (being designated as SGa and SGb), control gate-control signal TG and can control CCD's Electric charge shifts.Processing for the output signal U 1 of grating scale thereafter by programming, process includes common 12 times of signal count and disappear trembles process.

X-ray detector also includes that TDI ccd output signal processes circuit, processes circuit and uses conventional being correlated with Double sampled principle design (Zhang Lin, Li Yongxin, recklessly schoolmate. at CCD vision signal based on Correlated Double Sampling Reason research [J]. aerospace measurement technology, 2007,27 (2): 34-37.), multiple in order to TDI ccd output signal is removed Position noise.Mainly it is made up of a piece of CDS-1402 and two potentiometers R1, R2.Described signal U2 is respectively Connect the 3 of CDS-1402,4 pins；1 pin of CDS-1402 chip and 9 pins connect a potentiometer respectively R1, R2 are for compensating regulation to input voltage.The 11 of CDS-1402,12 pins meet EPM7512 respectively SHP and SHD signal, carried TDI CCD respectively after described signal U2 is sampled, kept The signal High of output signal datum information and the signal Low of signal level information.CDS1402 chip 7,8 pins be connected, 6 pin are connected through potentiometer R3 and 8 pin, make two paths of signals High and Low carry out Difference operation, is only carried the output signal U 3 of pixel signal amplitude information in TDI ccd output signal, by 22 pin export to next stage.

Vision signal AD conversion uploads device, uses existing high-speed data acquisition card FCFR-USB9825 pair The functions such as ccd output signal is AD converted, FIFO stores, data USB are uploaded；X-ray detector is defeated Going out signal U3 and access capture card input, the internal principle of capture card is as it is shown in fig. 7, signal is through capture card By USB transmission to host computer after collection, process, PC is received the data of data collecting card transmission and is programmed into The display of row image, and it is stored as medical bmp formatted file.

Claims (5)

1. a digitlization update device for film type panorama gear division X-ray machine, for existing hospital film type Panorama gear division X-ray machine is digitized upgrading, it is characterised in that: include film magazine velocity scanning device, based on The x-ray detector of TDI CCD, vision signal AD conversion uploads device, PC display platform and power supply electricity Source；The motion of existing film type panorama gear division X-ray machine scanning film magazine is scanned, so with film magazine velocity scanning device The rate signal afterwards scanning obtained is passed to x-ray detector based on TDI CCD, its acp chip CPLD Motor message is processed, is realized by CPLD inside programming: the motor message of grating scale output is arteries and veins Rush signal, be specifically film magazine often pass by 4um grating scale output one pulse；The pixel of CCD is The transfer of 48*48um, i.e. CCD internal charge is once passed by 48um, the most only makes film magazine often pass by 48um Produce a pulse-triggered CCD electric charge to shift once, the electric charge of film movements and CCD just can be made to shift Synchronize；Direct to the grating scale exactly output signal for the treatment of method carries out 12 times of countings so that grating scale triggers Pulse is become mono-pulse of 48um from original mono-pulse of 4um；Secondly because film magazine motion uses step Enter motor, the most necessarily have shake, so make the interference that grating scale output signal is shaken, such signal Processing routine part also to have one to disappear to tremble module；Motor message after process then drives sensor TDI CCD The transfer of internal charge, the transfer of CCD internal signal is driven for film magazine motor message, then needs at CPLD Programming produces the controlled input retaining transfer gate-control signal while CCD drives signal, and remaining CCD believes Number driving then such as definite integral driver, film movements signal controls CCD electric charge vertical transitions, to reach to transport Motivation structure shifts, with TDI CCD electric charge, the purpose mated completely；The tooth of x-ray detector output thereafter is effective Signal enter vision signal AD conversion upload device carry out signal analog-to-digital conversion and be transferred to PC show put down Platform, the PC display platform bin file to obtaining after analog-to-digital conversion carries out bmp form storage and shows；Power supply The digitlization update device that power supply is whole film type panorama gear division X-ray machine provides required voltage.

2. the digitlization update device of film type panorama gear division X-ray machine as claimed in claim 1, its feature exists In: described film magazine velocity scanning device uses grating scale to be scanned the motion of film, so can be real-time The film movements rate signal of film type X-ray machine is provided, and is triggered inside TDI CCD by motor message Electric charge transfer, make whole system be mutually matched, obtain digital picture clearly；Magnetic grid bar is fixed on x-ray On the film magazine of machine, grating ruler reading head is then fixed in X-ray machine C-arm, such film magazine drive magnetic grid bar with Read head has a relative motion, and such grating scale just can scan the movement velocity of film magazine.

3. the digitlization update device of film type panorama gear division X-ray machine as claimed in claim 1, its feature exists In: the motor message that described film magazine velocity scanning device obtains is because film type mechanical movement has flutter and makes The motor message directly obtained has shake, the most just needs the x-ray detector after film magazine velocity scanning device Acp chip CPLD by programming film magazine motor message is carried out de-jitter, dithering process is passed through CPLD chip programming realizes, and disappears and trembles process reference key jitter treating method.

4. the digitlization update device of film type panorama gear division X-ray machine as claimed in claim 1, its feature exists In: x-ray detector based on TDI CCD includes driving signal section and the CCD output letter of TDI CCD Number process part, the CCD pixel of described x-ray detector based on TDI CCD is 48*48um, because of This CCD electric charge often shifts the 48um that once passes by, and in film magazine velocity scanning device, grating scale is given every 4um Go out a pulse, so for making the film 48um that often moves shift once to trigger CCD, then need grating scale Signal carries out 12 countings, and namely film often walks 48um to mono-transfer pulse of CCD, and counting passes through CPLD chip programming realizes.

5. the digitlization update device of film type panorama gear division X-ray machine as claimed in claim 1, its feature exists In: described x-ray detector based on TDI CCD, directly the x-ray of reception can be changed into the signal of telecommunication； And design TDI CCD and drive signal that the electric charge of TDI CCD can be made to shift the time of integration by outside mechanical movement Pulse signal carries out the control of external trigger, is embodied as being to add on the basis of former CCD drives signal procedure Enter conditional statement so that CCD electric charge vertical transitions gate-control signal can be with external trigger, and on hardware circuit Reserved external control signal input port.