CN85106837A - Slit X-ray photographic equipment - Google Patents

Abstract

This equipment comprises x-ray source, collect to see through human-ray's X-ray detector and before x-ray source in order to form the slit diaphragm of planar x-ray fan beam, in order to obtain the complete x ray image of human body (certain part), this fladellum carries out scanning motion.Also be furnished with sniffer, it comprises many sheet shaped pieces of vertically arranging along the instantaneous X-ray detector condition part of pointing out, and every sheet shaped piece produces the signal of telecommunication according to the instantaneous ray that shines on the relevant sheet shaped piece of X-ray detector.Slit diaphragm includes many sheet shaped pieces of vertically arranging along slit, each at least with an attenuation parts co-operation, and attenuation parts is furnished with control device.

Description

Slit X-ray photographic equipment

The present invention relates to a kind of slit x radiographic apparatus, this equipment includes x-ray source, place the X-ray detector of illuminated human body back, this detector is collected the ray that sees through human body, and the slit diaphragm of boundary between x radiographic source and illuminated human body, form plane x ray fladellum by this diaphragm, and in order to obtain the complete X ray direct-shadow image of human body specific part, this fladellum to carry out scanning motion at least.This kind equipment has been disclosed in No. 8303156, the Netherlands patent applications.

This known equipment includes a longilineal x ray detector, and its installing mode can make its plane of incidence always collect ray through slit diaphragm and illuminated human body.Detector, x radiographic source and diaphragm three's combined system moves with respect to human body, is scanned the specific part of human body, and detector converts the X ray of collecting to enhanced bright the elephant, uses so that the photographic film exposure.

Observed already, also can use the present invention when using different another kind of detector.For example such detector can be installed, it is not to be used for producing bright the elephant, but is used to provide the signal of telecommunication of representing images.

Simultaneously, detector can be processed into such size, and promptly when the fladellum scanning motion, it still keeps static.The back also will make an explanation to this.In addition, when absorbing the output image of detector, also can use the present invention with TV camera.

In a word, the present invention can be applied to arbitrary situation, therein, resembles in order to form an x ray shade, makes plane x ray fladellum scan irradiated human body within the specific limits.

In the equipment of in No. 8303156, Netherlands patent applications, knowing and other known equipment, all run into a problem, promptly must between the scope of the contrast sensitivity of shade elephant to be formed and contrast, make compromise, for example, in taking a picture in the thoracic cavity, can not well when both showing soft position such as lung and abdominal part, show position, huttriall such as rib and spine again, make the tiny difference of soft or hard position medium contrast all can see clearly.Remove this, also must have one to measure stroke earlier in order to adjust the x radiographic source.

Purpose of the present invention promptly is to eliminate the problems referred to above.In order to reach this purpose, according to the present invention, the equipment of the above-mentioned type has been proposed, it is characterized by: be equipped with the cooperative sniffer of X-ray detector, and including the sheet shaped piece that by slit diaphragm irradiated a collection of strip part along the x ray detector vertically connects arrangement, each sheet shaped piece can produce the signal of telecommunication during associated sheet shaped piece at once at roentgenization to the x ray detector; Slit diaphragm includes the many sheet shaped pieces that vertically connect arrangement along slit, each sheet shaped piece has a cooperative with it controllable attenuator at least, its quantity is corresponding with the number of the sheet shaped piece of sniffer, and is furnished with control device, in scanning motion, under the control of the signal of telecommunication that sniffer produces, the instant x quantity of X-rays X of adjusting by each sheet shaped piece of diaphragm.

Knew already that the past had been done a large amount of work for eliminating the problems referred to above.

At " the international special interest group progress report of physics and engineering in the medical imaging technique " (Procee-dings International Workshop on Physics and Engineering in Medical Imaging), March nineteen eighty-two number the 79th page, in DB Pu Laishi (Plewes) " the area of computer aided exposure in the scan-type film x radiography ", disclosed the method that makes visual Balance contrast in a kind of x-ray slit camera.According to this literary composition, for reaching this purpose, for the slit diaphragm in the motion, second slit diaphragm of cooperative motion with it be equipped with, first of the latter's position crosscut is able to do under the less mobile condition at diaphragm, and how much produce is rectangular or rhombohedral configuration.As a result, irradiated human body is in fact scanned according to flying-spot system.

X radiographic film box is to be placed on irradiated human body back.Be mounted with the detector of instant measurement through the can ray in the back of can.According to above measurement result, i.e. intensity and x ray energy spectrum have also been controlled in the adjustment of may command x-ray source thus.

Though the article of Pu Laishi is similar to the present invention relating to aspect the Balance contrast that makes dynamic imagery, but the method described in this article is based on different dominant ideas, it does not relate under the radiogenic situation of given x, adjusts the slit width of diaphragm partly.

Technology also has such shortcoming described in the above-mentioned article, promptly needs the controlled x radiographic source of high price.Another shortcoming is owing to used flying-spot system, to make the x ray of generation can only effectively utilize wherein sub-fraction, because most of ray is suppressed by cooperative mobile slit diaphragm.In order to obtain quantity of X-rays X by the less synthetic aperture of the diaphragm, also must adopt oversize x-ray source.In addition, also must long sweep time.

In addition, in the technology that this article discloses, measurement is carried out in the can back, and this can have influence on the power spectrum of X ray, and the control that its result adjusts the x radiographic source has the position of decay slightly to causing the x ray among the patient, can not reach optimization.

Also can consult and be published in SPIE the 347th volume, the application C of optical instrument in medical science, nineteen eighty-two number, the 106th page, the method that makes x ray video acquisition Balance contrast wherein set forth in the article " numerical control beam attenuator " of Pa Pule (Peppler) etc.s.According to described technology such as Pa Pule, used the attenuating elements array, but the decay of independent control element.After the decay of element is adjusted, just patient is carried out the x roentgenization.Therefore, the method for Pa Pule had not both related to x-ray slit camera, do not relate to the Balance contrast that makes dynamic image yet, and was time-consuming very.

Below referring to accompanying drawing, tell about some embodiment of present device with way of example, wherein:

Fig. 1 is the schematic side elevation of x ray slit camera installation one embodiment of the present invention;

Fig. 2 has schematically represented to can be used for the slit diaphragm in Fig. 1 equipment;

Fig. 3 has shown the mode of how slit diaphragm among Fig. 2 being controlled;

Fig. 4 has shown some embodiment of slit diaphragm shown in Fig. 2;

Fig. 5 shows slit diaphragm and method that can the effective slit width of local control;

Fig. 6, Fig. 7 and Fig. 8 show the various modification of Fig. 5;

Fig. 9～Figure 11 shows another embodiment of may command slit diaphragm of the present invention;

The further meticulous improvement that Figure 12, Figure 13 reflection has been done the present invention;

Another embodiment of the present invention shown in Figure 14.

Fig. 1 is the schematic side elevation of x-ray slit camera equipment one embodiment, includes x radiographic source 1, and it is adapted to carry out the motion shown in the arrow 3 with slit diaphragm 2.Produce plane fan-shaped x-ray bundle 4 by slit diaphragm, when x radiographic source and slit diaphragm carry out as shown in arrow 3 rotatablely moving, just carry out scanning motion.

Observed already, the radiogenic scanning motion of x can also obtain like this: make the x radiographic source keep static, allow slit diaphragm vertically make transverse translation with respect to slit, and may be with rotatablely moving; Perhaps, make diaphragm keep static, and make the x radiographic source carry out translation and possible rotatablely moving.

Slit diaphragm is provided with a casing 5 at the spacing place that can hold illuminated Ren Ti Yin relatively, comprises one in this casing and has the x ray detector 6 of the plane of incidence fully greatly.When x radiographic source and slit diaphragm rotatablely move, collect the ray that arbitrary moment sees through illuminated human body.

In an illustrated embodiment, for example,, adopted nearly Jiao to gather the long tubular detector of type, the x ray of collecting has been transformed into bright the elephant, synchronously carried out as shown in arrow 7 moving both vertically with the radiogenic rotation of x thus with method described in No. 8303156, the Netherlands patent applications.

The lens combination 8 that the instantaneous strip light image that is provided by detector is drawn by signal projects on the film 9, forms complete image by the band representation of subsequent projections.

According to the present invention, near x ray detector 6, be provided with a light detection device 10, institute's apparent direction crosscut figure plane, it includes many sheet shaped pieces that connect arrangement, the light quantity that each sheet shaped piece measurement of x ray detector exit facet is produced the qi part accordingly.For this reason, in the embodiment shown, light detection device moves with the x ray detector.The light quantity measured by the light detection device each several part becomes the signal of telecommunication with known means converted, simultaneously pass to the control device that signal is drawn among the figure through lead 11, control device be used for the local seam of adjusting slit diaphragm wide and (or) its x ray transmitance, for this reason, slit diaphragm is made up of a collection of sheet shaped piece, and its number is identical with sheet shaped piece in the light detection device.In the diaphragm slit width of each sheet shaped piece and (or) transmissison characteristic can independently be regulated by one of following each method.

According to the present invention, the adjusting of diaphragm sheet shaped piece is carried out during the ray at irradiation x, has so just obtained the control of dynamic instantaneous exposure, film 9 can be at any time exposure in the best way.Another advantage is, obtained the noise balance thus, makes that signal to noise ratio is constant in the process that forms whole image, and this is very important when Applied Digital x roentgenodiagnosis technology.

Nature, the mode of this light detection device setting can not be disturbed the x ray channel between x ray detector 6 and the lens combination 8.

Fig. 2 a has schematically represented an embodiment of slit diaphragm in the present device.This diaphragm has a top 20, can be made by lead, also has a bottom 21, and the sheet shaped piece 22 that can slide to top is each other arranged at this bottom.This type of sheet shaped piece 22 also can be made by lead.

The position that a certain moment wiper 22 may be located when Fig. 2 b represented to shine the x ray, the sheet shaped piece shown in the arrow has been shifted to the upper direction of diaphragm, is reduced the slit width of this place's diaphragm.

The scope that moves in some particular moment depends on the measured light quantity of light prober 1 corresponding sheet shaped piece.

In the embodiment shown, 10 wipers have been adopted corresponding to 10 optical detection lamellar parts.

In the x in thoracic cavity radiography, can obtain the result of satisfaction with the wiper of above-mentioned number.If be ready certainly to use the wiper of different numbers.

Fig. 3 has schematically provided the method that is used for controlling wiper in the slit diaphragm shown in Figure 2.Each wiper of diaphragm part 21 is all via a fixture 30, and for example a little bar is connected in one, for example, by soft coil core 31 made of iron, this iron core can slide in coil 32, also can remain on resting position by resetting means such as spring assembly or a Magnet.

Each coil is by an output 33 excitations of controller 34, and the control signal that occurs at each outfan 33 place depends on the input signal of this controller respective input 35, and back one signal is from the relevant sheet shaped piece of light detection device.Determined the position of relevant soft iron core by the current intensity of coil, thus also determined with diaphragm in the position that is coupled of wiper.

Can see that in the embodiment shown a wiper is only arranged in the member of slit diaphragm.Nature, the member of slit diaphragm all can be equipped wiper.What also will illustrate a bit is, the wiper of diaphragm all is placed on the supporter, and this supporter all is clearly for the those skilled in the art in being familiar with the present technique field, so no longer narration here.

The wiper of a certain member in the slit diaphragm can have shown in Fig. 2 and Fig. 3, shown in Fig. 4 A, along the rectangular cross section that IV among Fig. 3-the IV line is cut open.In this situation, gap between the wiper or changeover portion can stay stitching in final x actinogram.In order to reduce this probability, the transverse section of every wiper can be trapezoid in the slit diaphragm, as Fig. 4 B represented also it is contemplated that out other variation corresponding to the sort of transverse section among Fig. 4 A, for example, the wiper shown in Fig. 4 C is each other by lug, nib and groove structure engagement.

Fig. 5 represents can be applicable to the schematic side elevation of the slit diaphragm one different embodiment in the present device, and it is made up of the two fixed aperture members 50,51 that limiting fixed slit S.In order to indicate its orientation, Fig. 5 has schematically drawn x radiographic source 1.

Slit S includes many microscler attenuators that connect, one of them is expressed as 52 in Fig. 5, attenuator 52 stretches out slit S, is fit to move as pivot with respect to the part of stationary barrier, then be that perhaps the carrier with respect to suitable placement moves as pivot with respect to bottom 51 in the present embodiment.At an end of contiguous attenuator 52, use the same procedure of being told about with respect to Fig. 3 wiper, it is combined with the slidably soft iron core 53 of coil 54.Soft iron core is connected in an attenuator 55 again, is used to prevent iron core 53 slippage when the coil excited target.In addition, in attenuator, be provided with back-moving spring, be compression spring 55a in the present embodiment.

In the present embodiment, the other end of attenuator 52 points to the x radiographic source, under the control of coil 54, puts in the x beam by slit S the amount doesn't matterly, makes it be blocked at least partially.

Attenuator can be plumbous system, but also can use the material of other suitable X ray of decaying such as soft iron, copper, gold etc. to make.

A kind of modification of Fig. 6 presentation graphs 5.In the embodiment of Fig. 6, the fixed component of slit diaphragm is designated as 50 and 51 equally.Between x radiographic source 1 and slit diaphragm, be placed with the U-shaped yoke that soft iron is made, its branch 60 is near slit diaphragm, another branch 61 is spaced apart therewith, contacted with branch 60 tops is flexure strip 62, its oblique top, the other end is equipped with the plate of magnetic material of magnet steel and so on, is positioned on the branch 61.In addition, be wrapped in around the branch 61, can compare with the control device of Fig. 3 by the coil 64 of control device excitation.Rely on the control of coil 64, magnetic sheet 63 is attracted by branch 61 with either large or small degree, thereby decays by the X ray of slit S either large or smallly.

As we can see from the figure, the width for control slit on the total length of slit S connects and has disposed many yokes that have flexure strip recited above.

But also know that the modes of emplacement of yoke in principle can be with the branch that has a coil 64 near diaphragm, flexure strip then be connected with dividing plate that branch apart on.

In addition, the yoke in two kinds of situations all can be placed in the opposite side of diaphragm, promptly away from the radiogenic side of x.

When adopting sliding part shown in Fig. 2～4 or Fig. 5 and long elements shown in Figure 6, their instantaneous position can also be controlled by micro-step motor, this motor has eccentric the connection with this parts of controlling by for example bar, so each parts just needs a motor, the Stepping Motor Control signal is provided by control device 12.For the operation of satisfaction guaranted, used motor after, in fact only adjusting the particular location of some attenuation part, but its quantity may be quite big, as 100.

Figure 14 schematically illustrates and uses motor to control the flaky attenuation part that slides.For the sake of clarity.Figure 14 only expresses cooperative 4 the parts 22a～22d of slit that cover with slit diaphragm 2, each parts all passes through rigidity connector 130a-130b, a connecting rod for example, do eccentric the connection with the axle of motor 131a-131d, or do eccentric the connection with garden dish or cam 132a～132d on being contained in axle, like this, the rotation of step motor shaft just is converted to the slip of dependent attenuation parts by eccentric ratio.

Fig. 7 represents a kind of modification different with Fig. 5, and many shaft-like piezoelectrics parts that connect arrangement are arranged, and one of them is designated as 20, at least join with one of slit diaphragm member or an appropriate carriers, during such part stationary is straight, but when both sides are added with voltage, parts become curved as shown in Figure 7.Can utilize above-mentioned effect wide with the seam that controlled manner changes slit diaphragm.

This parts can be buied by the trade name of Bi Moerfu (Bimorph) flex member.Need know, so because this base part mostly contains the purpose that lead can be conveniently used in the present invention.If attenuation effect is insufficient, the coated materials of then available absorption X ray is on the piezoelectrics parts.

Fig. 8 represents another kind of different modification, and it is wide wherein to have used magnetic liquid to adjust the seam of slit diaphragm.

Between x radiographic source 1 and slit diaphragm, be provided with a collection of plastics or the flat hollow pipe 80 of glass that connects arrangement, in be filled with the known magnetic liquid 81 of character.

The last end device of above-mentioned each root pipe has utmost point piece 82, links to each other with the iron core that is wound with coil 83, and when coil electricity, this magnetic liquid is subjected to the attraction of utmost point piece and moves before slit S, like this, has just decayed partly from the radiation of x radiographic source 1.

Other has the embodiment of an attenuating device to be illustrated among Fig. 9, it with either large or small ground of controlled manner local attenuation by maybe will be by the x ray of slit diaphragm.

Provided among Fig. 9 before or after slit diaphragm, be parallel to this slit and extend out two row magnetic poles 90,91.It is 92 that the slit of this diaphragm is illustrated by the broken lines.Above two row's magnetic poles are settled in the relative all the time mode in two arctic or two South Pole.Each magnetic pole can be formed by permanent magnet or electric magnet, settles a light and little coil between every pair of relative magnetic pole, copper coil for example, and its length is suitable with the polar X-ray beam thickness of contiguous above-mentioned two rows.In Fig. 9 for the purpose of eye-catching, only express a coil 93, current intensity and direction by control coils 93, the position of this coil between two relative magnetic poles can obtain adjusting and changing, the copper cash of coil has absorbed all hard x rays and most of soft x ray, like this, utilize structure shown in Figure 9, just can be with the x ray of effective controlled manner decay by slit S.

Owing to and put between the coil 93 and must leave spacing, so can the structure shown at least two picture groups 9 be set by the preferably eccentric tandem of unbated x ray ground thus.Figure 10 is its sketch map.Second row have coil 93 ' magnetic pole 90 ', 91 ' be arranged on belt coil 93 first row magnetic pole 90,91 after.Magnetic pole among Figure 10 and coil are provided with to such an extent that tilt slightly with respect to x beam 4, make each coil produce an ellipse garden shade, and can control attenuation range exactly, provide the shade (all coils all puts in identical distance in the x beam) of the first winding displacement circle by solid line 94 among Figure 10 and by the shade of the second winding displacement circle of dotted line 95 expression.

Figure 11 represents can be used as the embodiment of attenuation part.Be wound with many windings 96 on the sleeve between two flanges 98,99, sleeve extends to an end of flange 98 back, and the part 99 of extending then is subjected to repulsion around relevant magnetic pole 100, cause coil movement.

This coil is suitable for working with the telecontrol equipment one that limits the coil extreme position, can utilize above-mentioned these two flanges 98,99 for this purpose, and they can touch corresponding magnetic pole two extreme position.This function also can by sleeve extension 99 ' free end and flange 99 finish.

In addition, also can use in the drawings with way of example to show a return spring at 101 places, if position shown in Figure 11 is a resting position, then spring 101 is extension spring; If position shown in Figure 11 is an extreme position, then spring 101 is a stage clip.

Experiment shows, will not be placed between two magnetic poles by each coil, and each coil is got final product corresponding to a single magnetic pole.In addition, if enough big vertical component is arranged on the direction of coil movement, then the return force of coil can be the own wt of coil.

Therefore, in a preferred embodiment, single row's magnetic pole is set above x beam to be decayed, just be enough to be competent at, the coil relevant with each magnetic pole is positioned at when resting position below the x beam, then is inhaled in the x beam with either large or small degree when work.

Saw already that in an illustrated embodiment, for example shown in Fig. 2 b, slit width can change along the long segmentation of seam.This may not be suitable sometimes.Yet, can be with the wiper among Fig. 2, Fig. 3 and Fig. 4, and the attenuation part among Fig. 5, Fig. 6 and Fig. 7 is divided into one group of odd number, only centre slice or central module in each group are controlled by control device, and each sheet or each parts all is connected as elasticity with connector.Like this, upwards look, just can obtain the gradual change comparatively low of slit width by the length of slit.

Only provide some examples above being noted that, changed the wide method of effectively seam of slit diaphragm in order to explanation partly.For the those skilled in the art that are familiar with the present technique field, after on read, chatting, will promptly find some other method, for example, each controlled slip sheet of many attenuation parts and slit diaphragm is worked together, thus each wiper has been introduced predetermined attenuation factor.

According to a given required attenuation of wiper, can be pushed into such position, slit forward position to one or more attenuation parts, so that required attenuation factor to be provided.Above-mentioned this modified version and other improved form all are regarded as comprising within the scope of the invention.

In narrow slit X-ray camera installation embodiment shown in Figure 1, used microscler nearly focal length pipe as the x ray detector.One microscler negative electrode is arranged in such pipe, make it have the material that the x ray is transformed into the material of light quantum and discharges electronics according to light quantum with known method.These electronics are attracted by an electric field, guide into parallel and the anode of getting bar form equally negative electrode, form bright an elephant under sudden electronic effect.

Light detection device can comprise the light-sensitive element on a series of x of being placed in ray detector casing, but these light-sensitive elements then can be placed in outside the casing, light detection device in this case can be made up of the string lens, each lens is all aimed at an anode part, and a photomultiplier tube has all been followed in each lens back.

Also can quicken the electronics that negative electrode discharged with following method by the x ray detector, even with charge-coupled image sensor (CCDs) array is anode, these CCDs can directly provide the output signal of telecommunication, can be used to local control slit width on the one hand, on the other hand, for example also can pass through the desired image of computer construction, at latter event, lens combination 8 and film 9 just are out of use.

The present invention also can be used for such x-ray slit camera equipment, does not wherein comprise the detector with the rotation campaign of x radiographic source and slit diaphragm, the substitute is the large-scale X ray screen by the x-ray source exposure that can carry out scanning motion.In this case, corresponding to the rotation of the x-ray source of X ray screen back, light detection device also carries out scanning motion.Another kind of form for example can (in fact also produce light here) before the X ray screen, the strip photoconductive resistance of arranged vertical is set, and it does not absorb X ray basically, forms light detection device therefrom.

Back one solution is particularly suitable for, and when this large-scale X ray screen was the screen of existing stable x x ray image intensifier x, this booster mostly had a garden shape entrance window.Imagination of the present invention provides the probability that reduces in this case patient's amount of radiation.Consulting Figure 12 below is described further.

The entrance window 120 of x ray image reinforced pipe has a surface that is subjected to plane fan-shaped x-ray bundle 4 bar shapeds scanning.Though x ray image reinforced pipe generally has garden shape entrance window, but x beam 4 scans a rectangular surfaces 121, the result makes by some part according to human body and is exposed under the x ray with there is no need, and this part x ray has shone human body really, but does not touch entrance window.By the following stated method, can prevent the amount of radiation that these are unnecessary.

By lead 11(Fig. 1) signal is passed to control device 12, the slide plate that makes slit diaphragm is fully according to the following manner closure, promptly in any scanning moment, the part that slit diaphragm is not closed, the equal in length of strip region 122 on its length and the entrance window that this moment is scanned.Described signal can be by one group of pick off generation of synchronously measuring the entrance window shape with scanning motion.The function that the shape of entrance window also can be used as scanning motion deposits memorizer in digital form.In scanning motion, read described memory contents, calculate the length of required slit diaphragm by computer, produce the signal that control device 12 needs.

In this situation, control device 12 except connecting the parts that limit slit width, can also be connected with the like that limits slit length.

But best embodiment application drawing 5, Fig. 6 and the parts shown in Figure 7 of adjusting slit diaphragm length parts limit the length of slit diaphragm and realize.

When above-mentioned this parts are used in each end of slit, promptly should regard these figure as side view, and should regard as the vertical view of slit diaphragm.Two parts of shown in Figure 2 this also can be used for this purpose.Each end at slit is equipped with such slide unit, and it can be made by (for example) lead.This embodiment shows that schematically in Figure 13, slide unit is denoted as 123 and 124.

If directly the black out can is placed in x ray screen back, then mark can be used and be placed in the preceding light detection device of x ray screen; Perhaps, be applied as and carry out scanning motion and x ray detector after being installed in can, and be furnished with aforesaid light detection device; Perhaps, using second large-scale x ray screen will be transformed into light through the x ray of film case, be thereafter the light detection device that carries out scanning motion.On the other hand, the shortcoming that can above-mentioned can influence the x ray energy spectrum occurs again, but has kept the wide advantage of local control slit diaphragm seam.

When the horizontal linear motion type scanning that replaces with rotary scanning with respect to slit length, also can use the present invention.

All such modification all are considered as comprising within the scope of the invention.

Claims (26)

1, a kind of x-ray slit camera equipment includes: the x radiographic source; Place illuminated human body x ray detector afterwards, this detector is collected the ray by human body; And device is penetrated slit diaphragm between radiographic source and the illuminated human body at x, form a plane fan-shaped x-ray bundle by this diaphragm, and in order to obtain the complete x ray video of required part on the human body, at least be that fladellum will carry out scanning motion, it is characterized in that: device has with the cooperative sniffer of x ray detector, and include, along the length that is radiated at the strip part that forms on the x ray detector by slit diaphragm to, connect many sheet shaped pieces of arrangement, each sheet shaped piece is applicable to that all the instantaneous radiation that is subjected to produces the signal of telecommunication on the x ray detector relevant portion; It is long to the many wipers that connect arrangement to be that also slit diaphragm includes along it, each wiper at least can same controlled attenuation part co-operation, its number equates with the sheet shaped piece of detector assembly, control device is equipped with and, in during scanning motion, according to the signal of telecommunication that sniffer produced, immediately adjust x quantity of X-rays X by this each wiper of diaphragm.

2, the equipment according to claim 1 is characterized in that the sheet shaped piece that connects arrangement includes many juxtaposed parts, can be each other along the longitudinal sliding motion of crosscut diaphragm slit, each parts links to each other with the slidably unshakable in one's determination of coil by the control device excitation.

3, according to the described equipment of claim 2, the cross section that it is characterized in that this and put parts is trapezoidal.

4,, it is characterized in that and put parts being meshing with each other by lug, nib and groove structure according to the described equipment of claim 2.

5, according to the described equipment of claim 2, it is characterized in that parts are divided into one group of odd number, elasticity connects between the parts, under the influence of control device, only middle position component is regulated.

6, according to the described equipment of claim 1, each that it is characterized in that slit diaphragm slidably sheet is that the elongated member of crosscut slit longitudinal extension concurs with one at least basically all, described parts are suitable for rotating under the influence of control device, in the beam that one end immigration x radiographic source is sent.

7, according to the described equipment of claim 6, it is characterized in that: above-mentioned elongated member links in one of diaphragm member between its end, or links on a carrier that extends in parallel with it; Also be to have at least some this base part respectively near its other end place, be connected in slidably magnetic bobbin core by the control device excitation.

8, according to the described equipment of claim 7, it is characterized in that above-mentioned elongated member is divided into one group of odd number, elasticity connects between parts, and only intermediary parts are connected in the slip iron core of coil.

9, according to the described equipment of claim 6, it is characterized in that at least some parts include flexure strip, the one end is fixed on the branch of U-shaped magnetic bobbin core, has plate of magnetic material on the other end, extends on another branch of U-shaped magnetic bobbin core.

10, according to the described equipment of claim 9, it is characterized in that each and the coefficient flexure strip of U-shaped magnetic bobbin core, elasticity is connected in the elongated of adjacency and has on the parts of similar orientation, and these parts do not concur with the U-shaped magnetic bobbin core.

11, according to the described equipment of claim 6, it is characterized in that at least some elongated member include piezoelectric element, this element bends under the voltage influence that control device provides, and makes the free end of piezoelectric element reduce the effective width of slit at this place.

12,, it is characterized in that the free end of each elongated member is coated with the material of decay x ray according to the described equipment of claim 6.

13, according to the described equipment of claim 1, each sheet shaped piece that it is characterized in that slit diaphragm all is equipped with the pipe across slit, is filled with a part of magnetic liquid in the pipe, and by control device excitation electric magnet, inhale magnetic liquid before slit in the magnetic field that is produced.

14, according to the described equipment of claim 1, it is characterized in that the x ray detector is the elongated image intensifier of a nearly focal length type, with the same moved further of the scanning motion of x radiographic source and slit diaphragm, and collected x ray is transformed into bright the elephant; Be that also this sniffer includes a series of light-sensitive elements that are coupled with the elongated photomultiplier tube, each all aims at the bright relevant part that resembles, and produces the signal of telecommunication that is proportional to instantaneous reception light quantity.

15,, it is characterized in that having a series of light-sensitive elements to be placed on the described elongated image intensifier according to the described equipment of claim 14.

16, according to the described equipment of claim 1, it is characterized in that the x ray detector is the microscler image intensifier of a nearly focal length type, include matrix as anodic CCD device (charge-coupled image sensor), its output signal is passed to control device on the one hand, passes to downstream component on the other hand to form required image.

17,, it is characterized in that the x ray detector is a fixing x ray screen, by including the light-sensitive detector of many juxtaposed sheet shape spares, is subjected to the synchronous scanning of scanning motion with x radiographic source and slit dividing plate according to the described equipment of claim 1.

18,, it is characterized in that the x ray detector is a fixing x ray screen, combines with can to cover the light mode according to the described equipment of claim 1; Also be after described can, to be mounted with second and collect the instantaneous detector that passes through the x ray of this can, thus ray is transformed into corresponding light quantity, this light quantity is by a series of light-sensitive elements, synchronously measure with the scanning motion of x radiographic source and slit diaphragm, and be converted into the corresponding signal of telecommunication.

19, according to the described equipment of claim 1, each that it is characterized in that slit diaphragm slidably sheet closely is close to the parts that devices all has many arranged in series, each all has given decay x ray rate, and control device is operated one or more parts each wiper front slide at diaphragm according to the signal that sniffer produces.

20, according to the described equipment of claim 1, it is characterized in that the x ray detector is a fixed x ray screen, it is juxtaposed to be that also detector includes, basically do not absorb the bars that the light-sensitive material of x ray is made, be placed in the side near the x ray screen of illuminated human body one side, stretch the crosscut scanning direction.

21, according to the described equipment of claim 1, it is characterized in that attenuation part is formed by juxtaposed coil, each such parts all with the polar magnetic pole combined effect of at least one row, this row's magnetic pole is parallel to the slit of slit diaphragm and settles, the electric current of each coil of flow path is limited by control device, each coil moves in the x beam under relevant polar influence according to current's intensity either large or smallly.

22, according to the described equipment of claim 21, it is characterized in that each coil all is wrapped on the sleeve pipe, this sleeve pipe have one with the magnetic pole prolongation of fit mutually, and can move with respect to magnetic pole.

23,, it is characterized in that being arranged with prejudicially at least two rows coil relevant with magnetic pole according to the described equipment of claim 21.

24,, it is characterized in that magnetic pole and coil are with respect to plane x beam oblique arrangement according to the described equipment of claim 21.

25, according to the described equipment of claim 1, it is characterized in that being equipped with and the coefficient device of the slit end of slit diaphragm, this device is used for changing the effective length of slit under the control of control device.

26, according to the described equipment of claim 1, it is characterized in that some attenuation part is connected on the axle of motor prejudicially by adapter at least, each motor is controlled by control device.

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