JPS58157450A - Pulse x-ray diagnostic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention belongs to the field of XlIl imaging equipment, in particular, pulse X41 diagnosis using digital radiography.
IllK related.

[Technical background of the invention and its problems]

In recent years, the circulation machine X! 1 Regarding diagnosis, especially angiography, Mayu is using ``digital radiography,'' which applies the time navigation technique and digital processing technology.
The technology called “Digital Fluo U Guffy” is X! ! Applied to diagnostic equipment.

An outline of the digital radiography will be explained next.

First, after injecting an angiographic agent into the brachial vein of a subject, for example, a patient, after 4 hours, the first IOX rays are irradiated.
Angiocontrast medium flows @0 subject-position fX@+Levy camera 2
X-ray TV image signal [4/D conversion, jI! The signal is stored in the digital memory of No. 1 as a digital X@television signal mask. Next, when the time (CT) after the injection of the angiographic medium and the uptake of the mask reaches elapsed L7, @2#A30X! Do the i-shot ah.

After that, for example, intermittently x at a predetermined number i per second
tm* radiation is performed, and the area to be examined in which the angiographic contrast agent gradually fills with KgfL is visualized over time by the KX @ 1 TV video signal t#I2 is stored in the digital memory. and,#! X-ray television image signal t in the second digital memory - X in the first digital memory
In addition to subtraction/operation using the line television picture signal, the subtractor 7N, which uses the blood vessel SIR into which the vascular contrast agent is flowing as a subtraction target, is synthesized.
By D/A converting this subtractor device signal, an analog signal is obtained, which can be displayed on a subtractor monitor or filmed using a subtractor 7317 Kamakura multi-format camera. .

The digital radiography can be applied not only to the conventional vascular contrast agent injection method using an arterial catheter, but also to the intravenous injection method that does not use an arterial catheter, making it possible to perform safe, quick, and accurate diagnosis. It has attracted a lot of attention in recent years because of its advantages.

Digital radiography also includes mask mode radiography (Mask Made Radiography).
SgriaL Imε! L road!
Mat's FLbor-Icopy) (Contin
It is also called vouz Mad-. ). The former is suitable for diagnosing test areas with little electrodynamics such as the head, kidneys, and peripheral vascular system9, while the latter is suitable for the diagnosis of the heart and cardiac i11! Suitable for diagnosing areas of the fly's vascular system that have relatively large movements.

By the way, conventionally, xI! In diagnostic equipment, the generation form of OX-rays is not only pulsed X-rays but also fluoroscopic ll110X! iK There were many generation forms lI of similar series Since it causes blurring, it is not necessarily suitable for the purpose of mask mode fluoroscopic observation whose main purpose is dynamic observation. Company, this is because of the following reasons.

In other words, in an X-ray diagnostic apparatus that adopts the pulse X@Q generation type m, for example, 1
About 10 times per second 4IIIJII L
, since it is not possible to obtain the test area t with large movement.
- It was not possible to display it as having smooth motion. In pulse X-ray diagnostic equipment, a wide blanking chamber for 1 to 2 fields is placed on a general-purpose busicon type imaging tube, during which KX-ray pulses are irradiated, and then a busicon type imaging tube is used. The X-ray source f' accumulated in the imaging tube is scanned to generate an X-ray one-image signal (hereinafter referred to as video signal) tIa! Protruding T. In that case, the video signals of the 1st field, 2nd field, 3rd field, . . . 4 after the start of reading gradually decrease. Frame recording method using the 1st and 2nd field video signals as t-11m output or field I & shield method using the 1st field video signal 〇The video signal is completely recorded in both cases. , it takes several fields to erase the data. However, the number of fields to be erased cannot be exposed to the pulse ray (t) (if the pulse X1till! is to be irradiated, the remaining 1 and the remaining 1 after irradiating the bacterium) are not allowed. The obtained video signal will be mixed with the obtained video signal, making it impossible to obtain an accurate signal.
Therefore, in the pulse X@ generation mode, X# of at most 10 SF sheets per second! It is difficult to obtain anything other than images. Then, normally 60 sheets per second01ikIIj
An X-ray television that uses the standard television system for displaying 1$1tX#i! stored in its memory. - Complementing the period without shooting, anime Van'! 0, which indicates the #m iron having kilI*.In this case, WIB state observation cannot be performed satisfactorily.

Furthermore, when a field recording method is adopted in the pulse On the other hand, when using the 7-rem recording system, there is a difference in the output level between the 1st field and the 2nd field, so flicker appears on the X-ray television monitor screen. If you show up, you will only get the same amount of dignity.

[Purpose of the invention]

This invention was made in consideration of the above-mentioned circumstances, and it is possible to examine the subject area with large movements by using a high-quality instrument with smooth movement.
I! It is an object of the present invention to provide a diagnostic device using digital radiography that can be displayed as 1111. An X-ray tube, an image intensifier placed opposite the X-ray tube, and an image intensifier 7 through an optical device.
Each video signal from a plurality of XH television cameras and a plurality of OX-ray television cameras input to the output of the fire
- a mixing circuit for mixing, a digital processor for converting the video signal t from the mixing circuit to 4/D conversion and subtraction processing, and a video signal 1d for outputting the digital signal σ sector t to p; The 1% image includes a display device for displaying images, and a Nosdem controller that controls at least the X41 tube, the image intensifier, and the X@television camera according to a certain sequence.

[Embodiments of the invention]

#! FIG. 1 is a schematic block diagram showing an embodiment of the present invention.

In the figure, 1 is the X-ray tube that irradiates the subject 2 with pulsed X-rays], and 6 is the incident X-ray beam transmitted through the subject by XIIK irradiated by the x1m tube 1. and this
! Image intensifier (
I.I).

4 is the optical system IUI. To elaborate further,
Original school equipment *4/d, 1-15 RT large primary lens 4g placed in front of the output fluorescent image, and 2 OX-ray television cameras M)
2 placed in front of the w & detonator input picture of 5 and 6 respectively
The 1@150 output fluorescent light transmitted through the secondary lenses 4c and 4d and the primary lens 4at is distributed into, for example, a so:soo amount, and the QX@TV camera 5. O identification half honey-4 and 2
Next / Zu 4e, 41LID is placed in the cocoon direction, and 2
Next lens 4e, 4dK automatically calculates the amount of output power incident on the iron.
Adjustment party science forgiveness nine o) '7 (ILX) 4g#47 and two (DX@fv X-ray television camera 5 Next, two X-ray television cameras 5, equipped with, for example, a liquid crystal shutter and an output fluorescent light of 1.13 according to the sequence of
6 alternately. The imaging tubes 5g and 6g are installed on the two X-ray cameras 5 and 6 respectively)
Businesscon iJI! For example, Bidicon, 1Lambicon, Calnico/, Nricon Bidicon, Newhicon, Sachicon (trade name), etc. can be used, and it is said that Bidicon mainly containing PbOf as the original conductive material is particularly preferable. 7 and 8 are video amplifiers that increase the video signals output from the two X-ray television cameras 5 and 6, and 9 is a television camera timing controller. , two X-banded television cameras 55.6
control all 7-kens of 10i and 10b
Shown is the camera tube 5 in the two X@TV cameras 5 and 6.
g, a canned bias circuit which applies a canned bias t of 6g, and 11 is a 1111 blanking circuit which controls the grid voltage in IeIs to cut off the output fluorescence source other than the X-ray pulse. Reference numeral 12 indicates a video mix H path which combines video signals output from two X-ray television cameras 5.6 and t'L-t'.

Reference numeral 16 indicates a sync generator, which includes a 5.60 synchronization signal for two X-ray television cameras, a video amplifier 8, a television camera timing controller 9, a video mix circuit 1112, and a digital processor t to be described later.
14 generates a pulse signal that is the basis of each synchronization signal.

The digital processor 14 converts the video signals output from the two OX TV cameras 5.6 to
KV tract y*7 based on the digital signal
This process performs a thorough processing of image enhancement processing. To explain in more detail, the Ouo/pressure JII device (la
y 7thsp) 14A't'' is a VD converter, 14c is a VD converter, 14c is a filter. It is a digital memory of #I2 that stores the moat, and can sequentially store the subtraction images obtained by processing the mask between the moat shown in 14 and the subsequent moat. It is digital memory.

14/ is a switch for selecting whether to display a mask image or a subtraction image, and 14 is an information converter. 14y is an accumulated subtraction image. This is post-processing that performs image enhancement. 14 is an image synthesizer that synthesizes the uniformly emphasized subdoc 7-yon, and 1<i is a digital converter, which outputs an analog dropout video signal. The digital processor 14 configured as described above operates as follows, for example, by inputting a video signal before the angiographic contrast medium enters the test region via the pressure converter 14a and the transducer 14. Convert it into a digital signal and store it in a digital memory 14.
The iIO video signal into which the angiographic contrast agent has flowed is converted into a digital signal via the ω converter 14ht, and the master image is converted from the WkO digital video signal into which the angiographic contrast agent has flown using algorithm 14C. A digital video signal that is tputra! Toshi sequentially outputs digital subtraction images (instantaneous subtraction images). Digital memory 141 of the front K112
It is also possible to accumulate and accumulate K11lit button ywn iron. Next, in accordance with the switching operation of the switch 1410, the digital video signal in the digital memory 14d of the first set is converted into an analog video signal by the MA converter 14, and the master image is displayed on the television monitor 15.
ItL will instantly display the book ￥N7 meeting. Post-processing the digital video signals in the f9 to 20th digital memories 14-14! It is also possible to display the television monitor 16Kt gttraxis* through the D/A converter 14B after the iii* emphasis.

The delay pulse shown by 17 controls all 7 steps of XII
ait @ injection timing, xal tube 10 - shooting sea bream control, 7t140Ili control for the digital gauge a- described later, angiography contrast medium injection full 120c) IN control, optical system Ii &
Internal RC equipment Optical aperture D 4m, 4fcotit
4 control, 11jt, element 4g, 4hcvM'n, I-1 blanking circuit 110M control 7-step 5 command signals for each i
Output BK.

18 is the X41 controller that controls XflJ@#4, and 19 is the X! Apply to 1 tube 1^
Equipped with the ninth XIII high voltage generator that generates voltage noise,
Reference numeral 20 denotes an angiographic contrast agent injection device, which includes, for example, at least seven ringers for injecting into the blood vessels of the subject 20 and a drive device for driving four rings, and a total of seven stem controllers 170 that inject the subject by command signals. The X-ray contrast agent for blood vessels is configured to be automatically injected into the inside of the tube.

Next, pulse X! of the above configuration! In 0M2'ciA, the effect of 1# disconnection will be explained with reference to FIG. V
D) is the TV camera control command signal outputted from the camera timing controller 9, and C is the X-ray pulse emitted from the X-tube 1jD. For example, the pulse width is approximately α6 to 17 mm.
Od, which is t, is the 1, 1-j ranking signal output from the l-11 blanking circuit 11, and 69, - is the wide blanking signal input to the X-ray television camera 5. , / shows the cathode bias signal applied to the X41 TV power camera 50 keyaki tube 5gK,! 0 is the video signal output from the X-ray television camera 5), O is the wide Plan Young signal input to the Xfa television camera 6, and pSl is the X! 1 is the Cando Pius signal applied to the image pickup tube 6g1C of the television camera 6, j is the video signal output from the X-ray television camera 6, and `` is the total system control output (-217). The various system command signals sent to
@150 output award shading element 4yt so as not to overpower the party output
*It is a one-party element closing signal that causes a layer element to be created, and indicated by S'' is a translucent element closing signal that causes one layer element element to be created so that the output fluorescent signals of 1-16 are not input to the TV camera 6). 0 is a video signal to be used for recording), 0 is an example of the integral of the mask, and P is a video signal for displaying t-trac7yon. q
What is shown on the screen is a video signal that has undergone pseudo-interlacing in order to display the Naptra V-Zin image on a television monitor.

First, place the patient on a bed for X1m imaging, and
/M Photographing conditions and delay time, X-band exposure distance, e.g. 15 frames/5acSX@total number of seconds until the end of photographing, etc. Photographing program f: After setting on the operation panel (not shown), set-up of the total system controller 17 1, press the start button on the control panel, tl
As shown in FIG. 1, after a time period T has elapsed since the angiographic contrast medium was injected into the body of the patient 20 by the angiographic contrast medium injector 20, the first pulse X edge is emitted from the X-ray tube 1.
Ru.

As shown in Fig. 2, from the fall of the 11th 0X-ray pulse CO to the last 2nd look (the rise of DX@pulse C),
Due to the I-1 blanking signal d, which is output frequently from I@I Putsung King Gang Road 11, fluorescent keyaki no longer outputs from 1@15, and 9, the remnants of I-13 human power and X
The blanking of 1.15 is, for example, I@
This can be achieved by applying a reverse bias in a direction that cancels out the focus voltage during a specified period of time to the focus voltage of I6, thereby cutting off the focusing of I@I3. During the period of 1 frame (1/601 mc) from the rising edge 9 of the first OX@pulse, wide blanking was applied to the X-ray television camera 5's imaging control, and the imaging control was switched on. Fluorescence at output from 1@15 on the photoconductive surface of 5a
Accumulate enough. Furthermore, during the one-frame period mentioned above,
IMyt, the main closing signal is being outputted, and the 1.15 output fluorophore is not input to the image pickup tube 6a of the xliI television camera 6. After firing, the output of the planking signal is stopped)
The image pickup tube 560 of the X-ray television camera 5 uses an interlace scanning method to scan the accumulated conductivity. At this time, a canned bias signal f is input to the image pickup tube 5a so that the bias potential of the #I2 field (third frame) becomes more negative than 7n of the first field (second frame). In this way, by applying the cathode bias f: to the keyaki tube 5a, all of the potential *t is read out in the first and second fields and a video signal is obtained!
It is possible to prevent afterimages from occurring after the 1I3 field (4th frame). Therefore, 1@15 output fluorescent tubes are placed on the photoconductive surface of the image pickup tube.
By changing the interval during which the X-ray pulse is applied, the exposure interval of X-ray pulses can be shortened, and the image pickup tube 5a can output a large number of images per second as a video signal. The signal is input to the video mixer path 12 via the video amplifier 7t.

Next, at the fifth frame of the television vertical synchronizing signal C when the first visible pulse x* is emitted, a second pulse xmt- is emitted. jWhen irradiating the 12th O-pulse X-ray,
I@I Pufunchuung signal dKyopu 1.15 Human power planning was carried out, and the imaging tube 6g of the X-ray television camera 6 was
The fact that wide blanking 5 is performed and the input to the P Furthermore, it is the same as in the case of the first @O pulse be.

Thereafter, as shown in Fig. 2, pulsed X-ray O is irradiated at a rate of 1 for every 4 frames of the telephony direct signal gK, and the X-rays transmitted through the object by the pulsed
Alternate video signals with two OXm TV Kamets 5a6! ,
) and input it to the video mix H path 12.

The input video signals are mixed in a video mix path 12 and input to a digital processor t14.

The digital processor t14 converts the video signal K of the first field and the second field output from the two X@TV cameras 5 and 6 into digital O video by t-4'D conversion. The mask image designated by p by the 7 step command signal k and the roadside video during the busy period (11 m (,4-...C
゛-) is the first digital memo! 714d and averaged to form a mask image. Next, after the video signal path (Ea, ce->t, yn conversion) of subtracts 3 and 9 specified by the /stem command signal kKLD, the mask image is read out from the first digital memory 14d by algorithm 14c. The video signal and the video signals input sequentially from Em, Gg, . The instantaneous subtract 1 is added to the digital memory 144 of lI2, and the instantaneous subtract 1 is added to the digital memory 144 of lI2.
Mt- When displaying, a pseudo-interlaced method is used to prevent flickering on one screen. Although the instantaneous adder function cannot be applied to moving subjects, it is a function that is displayed on the television monitor 16.

According to the pulse Xm#interruption device with the above configuration, 15
Since the image can be displayed on the television monitor 15, it is possible to display a predetermined part of the subject as a smoothly moving image.An embodiment of the present invention will now be described in detail. However, it goes without saying that this invention is not limited to the above-mentioned embodiment 11, and can be implemented in a KW form as appropriate within the scope of the gist of the invention.

In the embodiment described above, 15 images per second were displayed on the OX-T TV monitor, but in another embodiment, a 7-stem time chart showing 112 etc. is compressed to V2 and x! If one pulse is emitted at a rate of once per Ct2-ma, and each of the two TV cameras 5°6 outputs a video signal path alternately at a rate of 1-for every 4 frames, 30 frames per second will be generated. It is slow to display on Oxmt TV monitor.

Further, in the embodiment described above, a field recording method is employed, but in another embodiment, a 7-rem recording method may be employed. In that case, it goes without saying that a rounding and gamma value correction circuit must be added to make the rfM of the video signal of the first field and the video signal of the second field the same.

In the embodiment described in AiJ, the television vertical synchronization signal (VD
) is 60 cor/sec (601h) ”T:6
As another example, the TV vertical synchronization signal is 60
#z Engineering) It may be large, and in that case, six or more X41 television cameras may be used.Furthermore, in the above embodiment, the mask images when performing Naptracion treatment were all the same. As another embodiment, the video signals sequentially inputted manually to the digital pull 7 t14 may be used as mask images, and the saputo-raken process may be performed between them and the next input video signal.

〔Effect of the invention〕

According to this invention, it is possible to obtain the following effect tII, that is, I@IK blanking is applied to Xla@
Except for the firing point! [After cutting off and wide blanking the image pickup tube to accumulate a sufficient light image, applying a canned bias to prevent residual iron from remaining after the 5th field, 1l
The optical image of the I2 field is effectively reduced, and multiple OX@X-ray television cameras, in particular two OX-ray television cameras, are operated alternately to output video signals.
It can display 15 images per second on a TV monitor and has the possibility of displaying 30 images per second.

Therefore, the pulse xaiis cutoff value according to this invention
, the smooth movement of the movie displayed on the second TV screen is difficult to perform accurate chi-ray diagnosis◎

[Brief explanation of drawings]

Claims (3)

[Claims] (1) Xl1111, ccyxa tube C facing the next image inten V fire, optical device IIl
A plurality of X-ray television cameras which input the output fluorophore image through the image input 7 fire, a mixing circuit which warms each video signal from the plurality of X-ray television cameras 2, and output from the heating circuit. a digital processor that converts the video signal into 4'D and passes it through the computer; a display device that displays an image on the video signal output from the digital processor; Tensifier, X! I TV camera constant 7
- a pulse Xa
. (2) By blanking the image intensity 7 fire outside the X-ray emission period, the fluorescence gI is generated only during the x-ray emission period! The pulse Xll11 diagnostic device according to claim 1, which outputs the tq# value. (3) The optical device is equipped with a human power source means, and the image intensity V-fire is applied to the source input section of a plurality of X-ray television cameras in a certain order by opening and closing the light shielding means according to a certain number of times. A pulse X-ray diagnostic apparatus according to claim 1, characterized in that the output fluorescent light is input to the pulse The first aspect of the present invention is characterized in that the image intensity 7fire O output light 2*1 is accumulated by image intensification, and the output type ill is read out by applying a cathode bias.
Pulse X-ray diagnostic equipment and