CN1951331B - X ray image diagnosis device - Google Patents
X ray image diagnosis device Download PDFInfo
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- CN1951331B CN1951331B CN2006101361252A CN200610136125A CN1951331B CN 1951331 B CN1951331 B CN 1951331B CN 2006101361252 A CN2006101361252 A CN 2006101361252A CN 200610136125 A CN200610136125 A CN 200610136125A CN 1951331 B CN1951331 B CN 1951331B
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Abstract
An X-ray image diagnosis device in accordance with the present invention comprises an X-ray source (3), an X-ray plane detector (5), an X-ray irradiation region setting unit (15), an X-ray diaphragm unit (4), an X-ray diaphragm operating unit (8), an X-ray diaphragm control unit (9) and a display unit (14). The X-ray image diagnosis device further comprises an effective field of vision control unit (10) for working out the effective field of vision of said X-ray plane detector (5) corresponding to said X-ray irradiation region; an image processing unit (11) to establish corresponding relation between the effective field of vision being worked out and detecting region of said X-ray plane detector (5), and to read out the permeation X-ray data of the detecting region of said X-ray plane detector (5) to establish the corresponding relation; and an X-ray control unit (12) for controlling the quantity of X-ray radiating from said X-ray source (3) according to the permeation X-ray data which has been read out.
Description
Technical field
The present invention relates to detect the radioscopic image diagnostic equipment of X ray detector of examinee's transmitted X-rays with having the wide visual field, particularly can make X-ray tube and imaging system follow the trail of the device of bio signal.
Background technology
In recent years, the radioscopic image diagnostic equipment is used and X ray can be directly changed into the X ray plane detector (Flat Panel detector is to call FPD in the following text) of digital electric signal as the medium that detect X ray.FPD carries out two-dimensional arrangements with the X ray detecting element of semiconductor-type and forms.
Thereby, change the continuous digitized of the radioscopic image diagnostic equipment from simulation-to-digitals such as X-ray film, image amplifiers.
The location of this FPD is the thing of X-ray film as an alternative, so adopt the detector in the wide visual field, makes a shot just can access the position of wide scope such as examinee's abdominal part, chest, huckle.
The FPD in this wide visual field not only is used for above-mentioned wide area of visual field, also is used for the perspective photography in Narrow Field Of Vision zone, takes into account these zones and obtains radioscopic image.
As the one example, have and the examinee to be shone the X-ray tube of X ray and to have used the camera system of the FPD that detects the X ray that has seen through above-mentioned examinee to be installed in radioscopy photographic attachment on the C arm support.(for example, patent documentation 1)
Patent documentation 1: the spy opens the 2001-95790 communique
Summary of the invention
The problem that invention will solve
But, in the radioscopy photographic attachment of above-mentioned patent documentation 1 record, above-mentioned C arm support carry out to X-ray tube and camera system (FPD) over against the time the orthogonal direction of X ray radiation axle move such mechanical action.Such mechanical action can not be followed the trail of bio signals such as heartbeat.Like this, X-ray tube and imaging system are followed the trail of content not consideration in the radioscopy photographic attachment of above-mentioned patent documentation 1 record of bio signal.
The object of the present invention is to provide a kind of radioscopic image diagnostic equipment that X-ray tube and camera system is become to follow the trail of.
Be used to solve the technical scheme of problem
The radioscopic image diagnostic equipment of the present invention has: x-ray source (3), to examinee (2) irradiation X ray; X ray plane detector (5), with this x-ray source (3) facing to configuration, form by a plurality of X ray detecting element two-dimensional arrangements of the transmitted X-rays that detects above-mentioned examinee (2); X-ray irradiation area setup unit (15) is set the x-ray irradiation area to above-mentioned examinee (2); X ray diaphragm unit (4) is configured in the x-ray bombardment side of above-mentioned x-ray source (3), X ray is limited in the x-ray irradiation area of having been set by above-mentioned x-ray irradiation area setup unit (15); X ray diaphragm operating unit (8) is set the desired location of above-mentioned X ray diaphragm unit (4); X ray diaphragm control unit (9), detect the present position of above-mentioned X ray diaphragm unit (4), and above-mentioned X ray diaphragm unit (4) is moved control from this present position that has detected to the desired location of having set by above-mentioned X ray diaphragm operating unit (8); And display unit (14), to show as radioscopic image by the transmitted X-rays that above-mentioned X ray plane detector (5) has detected, it is characterized in that, have: effective field of view control unit (10), calculate effective field of view zone with the corresponding above-mentioned X ray of above-mentioned x-ray irradiation area plane detector (5); Graphics processing unit (11), corresponding relation is set up with the zone that detects of above-mentioned X ray plane detector (5) in this effective field of view of having calculated zone, read the transmitted X-rays data on the zone of detecting of this above-mentioned X ray plane detector (5) of having set up corresponding relation; With X ray control unit (12), based on these transmitted X-rays data of having read, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation.
According to the present invention, can provide a kind of radioscopic image diagnostic equipment that X-ray tube and camera system can be followed the trail of.
Description of drawings
Fig. 1 is the figure that represents the formation of the radioscopic image diagnostic equipment general in the embodiments of the present invention.
Fig. 2 is output image, the effective field of view image of expression X ray plane detector and the figure that this image has been carried out the example of amplification.
Fig. 3 is the key diagram of the feedback signal calculation method in first kind of embodiment of the present invention.
Fig. 4 is the flow chart of the action of explanation first kind of embodiment of the present invention.
Fig. 5 is the key diagram of the feedback signal calculation method in second kind of embodiment of the present invention.
Fig. 6 is the flow chart of the action of explanation second kind of embodiment of the present invention.
Fig. 7 is the key diagram of the feedback signal calculation method in the third embodiment of the present invention.
Fig. 8 is the flow chart of the action of explanation the third embodiment of the present invention.
Label declaration
2 ... the examinee, 3 ... X-ray tube, 4 ... the movable aperture device of X ray, 5 ... X ray plane detector (FPD), 8 ... X ray diaphragm operator, 9 ... X ray diaphragm control part, 10 ... the effective field of view control part, 11 ... image processing part, 12 ... the X ray control part, 13 ... the X ray high voltage device, 14 ... display part, 15 ... operator, 16,17,18 ... holding wire
The specific embodiment
The preferred implementation of the radioscopic image diagnostic equipment that just the present invention relates to utilizes accompanying drawing at length to describe.
Fig. 1 is the figure of the formation of the expression radioscopic image diagnostic equipment of the present invention.
(configuration aspect)
The movable aperture device 4 of X ray is configured in the x-ray bombardment direction of X-ray tube 3.The movable aperture device 4 of X-ray tube 3 and X ray faces toward configuration with X ray plane detector (FPD) 5, and the examinee 2 who is placed on the sleeping berth 1 is clipped in the middle.C arm support 6 is at one end gone up X-ray tube 3 and the movable aperture device 4 of X ray is installed, and X ray plane detector 5 is installed on the other end, is supported on the roof Ce by telescopic arm Te.
(distribution aspect)
C arm control part 7 is electrically connected with C arm support 6 and operator 15.X ray diaphragm operator 8 is electrically connected with the movable aperture device 4 of X ray by X ray diaphragm control part 9.Effective field of view control part 10 is electrically connected with X ray diaphragm control part 9 by holding wire 16, is electrically connected with image processing part 11 by holding wire 17.X ray control part 12 is electrically connected with image processing part 11, X ray high voltage device 13 and operator 15 respectively by holding wire 18.Display part 14 is electrically connected with effective field of view control part 10 and image processing part 11.
(function)
X-ray tube 3 produces the X ray that the examinee 2 who is placed on the sleeping berth 1 is shone.4 pairs of ranges of exposures that are radiated at the X ray on the examinee 2 of the movable aperture device of X ray limit.X ray plane detector 5 faces toward configuration with X-ray tube 3 and the movable aperture device 4 of X ray, detects examinee 2 transmitted X-rays, and converts it to Digital Image Data.C arm support 6 at one end go up to be installed X-ray tube 3 and the movable aperture device 4 of X ray, and X ray plane detector 5 is installed on the other end, keeps it to face toward configuration relation and supports.The position of C arm control part 7 control C arm supports 6 positions control by examinee 2 diagnosis object position to X-ray tube 3, the movable aperture device 4 of X ray and X ray plane detector 5.X ray diaphragm operator 8 is set the range of exposures of X ray.The x-ray bombardment scope that X ray diaphragm control part 9 input has been set by X ray diaphragm operator 8 is by the movable aperture device 4 control x-ray bombardment scopes of X ray.Specifically, X ray diaphragm control part 9 detects the present position of the movable aperture device 4 of X ray, and controls, and the movable aperture device 4 of X ray is moved from this present position that is detected to the desired location of having been set by X ray diaphragm operator 8.Effective field of view control part 10 is by the signal of holding wire 16 inputs from the X ray diaphragm scope of X ray diaphragm control part 9, obtain the effective field of view of X ray plane detector 5, and corresponding relation is set up in the zone that detects of this effective field of view and X ray plane detector 5.Image processing part 11 from the X ray detecting signal of X ray plane detector 5 with from the effective field of view signal of effective field of view control part 10, is implemented the Flame Image Process that needs by holding wire 17 inputs, generates the radioscopic image data for diagnosis.Also have, the signal that image processing part 11 generates to X ray control part 12 feedbacks, and pass through holding wire 18 and transmit the signal of these generations, make the brightness of the radioscopic image that shows at display part 14 become set-point.X ray control part 12 generates the signal of controlling from the X ray of X-ray tube 3 radiation according to from the effective field of view signal of effective field of view control part 10, from the feedback signal of image processing part 11 and the X ray condition of setting with operator 15.X ray high voltage device 13 have produce with from corresponding anode and the cloudy interpolar dc high voltage (to call tube voltage in the following text) that is applied to X-ray tube 3 of the control signal of X ray control part 12, flow out the function of the electric current (to call tube current in the following text) that between the anode of above-mentioned X-ray tube 3 and negative electrode, flows through in (x-ray bombardment time) during preset time.Display part 14 will be controlled to radioscopic image by the radioscopic image data show that image processing part 11 has generated, and it is shown.Operator 15 is set the various control signals such as setting of the position signalling of the setting of check point, the setting of X ray condition, above-mentioned C arm support 6, and entire system is controlled.
The movable aperture device 4 of X ray constitutes: what have adjustment x-ray bombardment district up and down is a pair of limit blade of main material with lead, and this limits blade arrangement up and down and becomes the groined type shape, and a pair of limit blade that faces toward mutually symmetry abreast moves.The movable aperture device 4 of X ray constitutes by this, can utilize the X ray diaphragm that can independently move, and at random sets the x-ray bombardment district.
The movable aperture device 4 of the X ray of this formation makes the X ray that radiates from the focus of X-ray tube 3 become the line awl, adjusts the x-ray bombardment district of its plumb bob.
Thereby the x-ray bombardment district is controlled the position of the limit blade of the movable aperture device 4 of above-mentioned X ray and is obtained adjusting by the control signal that generates at X ray diaphragm control part 9.
Obtain adjusting in the concrete operation below in above-mentioned x-ray bombardment district.The operator sets irradiated region with X ray diaphragm operator 8.The irradiated region of having set is imported into X ray diaphragm control part 9 as the irradiated region setting signal.X ray diaphragm control part 9 generates the position control signal of X ray blades of diaphragm, makes the position of the limit blade of the movable aperture device 4 of X ray become the position of the above-mentioned irradiated region of having set.The x-ray bombardment district is set in the position of the limit blade of the movable aperture device 4 of control signal control X ray that is generated by X ray diaphragm control part 9.
X ray plane detector (FPD) the 5th is directly had an X-rayed radioscopic image, photograph as digital picture, thereby obtains the semiconductor-type digital X-ray detector of digital picture in real time.
This X ray plane detector 5 has indirect conversion mode and direct conversion regime according to the X ray conversion regime, and the present invention adopts the indirect conversion mode herein applicable to any conversion regime.
The X ray plane detector 5 of this indirect conversion mode is converted to the flasher of light and will be converted to photodiode (for example amorphous silicon type) formation of electric charge from the light of this flasher output by the X ray that will see through examinee 2.Photodiode is to read this electric charge through switch element [for example, TFT (Thin Film Transistor)], obtains the thing of radioscopic image data.Also have, photodiode has a plurality of detecting elements that converted and seen through examinee 2 the corresponding signal of telecommunication of X ray amount to line up the two-way array shape, and above-mentioned X ray amount becomes the electrical picture signal that has been converted to the signal of telecommunication by above-mentioned detecting element respectively.
This electrical picture signal is read by above-mentioned image processing part 11, and then converts data image signal to by analog/digital converter, implements various Flame Image Process, generates the radioscopic image data.
The x-ray bombardment district that effective field of view control part 10 will have been set by X ray movable aperture device 4 is as effective field of view.This effective field of view is corresponding with the position control signal of the X ray blade of diaphragm that is generated by X ray diaphragm control part 9, so this signal is input to effective field of view control part 10, is converted into the effective field of view of X ray plane detector.
Corresponding relation is set up in the position of the X ray detecting element (pixel) that is arranged in the two-way array shape of the effective field of view of this conversion gained and X ray plane detector 5, it is outputed to image processing apparatus 11.
Also have, image processing apparatus 11 is calculated the feedback signal to X ray control part 12 feedbacks, and this feedback signal makes the brightness of the radioscopy image that shows at display part 14 become given brightness value.X ray control part 12 generates the X ray control signal according to the above-mentioned feedback signal of calculating.X ray high voltage device 13 is controlled by X ray control part 12, make with the above-mentioned X ray control signal corresponding X ray that has generated from X-ray tube 3 radiation.
First kind of embodiment
Fig. 2 is the effective field of view image and this image has been carried out enlarged image.With figure (I) is the output image (image of a) in the full visual field of X ray plane detector 5.With figure (II) is the image that the effective field of view zone with dashed lines frame with the movable aperture device 4 restriction x-ray bombardment district gained of X ray is got up to represent.In addition, in fact, the zone in the dotted line outside is limited by the X ray blade of diaphragm, and X ray is not radiated on the examinee 2, in order to make effective field of view seem clear this effective field of view with dashed lines frame is got up to represent.With figure (III) is effective image b, c, d, e as the effective field of view zone of above-mentioned (II), (IV) is that the image with above-mentioned (III) has carried out enlarged image b ', c ', d ', e ', is by b
c
d
The order of e has been dwindled the example of effective field of view.
In addition, the effective field of view information that obtains from effective field of view control part 10, according to this information, by above-mentioned image processing part 11 with the corresponding amplification of effective field of view with above-mentioned effective field of view zoom.
Also have, the effective field of view of b, c, d, e is set with X ray diaphragm operator 8 by the operator.
Dwindle the x-ray bombardment district so as much as possible, just can reduce being subjected to examinee 2 according to the X ray amount.
Next, with the calculation method of Fig. 3 explanation to the feedback signal of X ray control part 12 feedbacks.
This Fig. 3 is: to figure (I), with figure (II), with till the figure (III) with the same figure (I) of Fig. 2, with figure (II), identical with figure (III), carried out with given amplification at image on enlarged image b1, c1, d1, the e1 of Fig. 3 (IV) of amplifying, will be used to calculate the figure that the regional frame of above-mentioned feedback signal gets up to represent with solid line as shown in the figure Fig. 3 (III).
The zone of calculating of the feedback signal shown in Fig. 3 (IV) is made as, though the effective field of view difference, also less than the given zone in above-mentioned enlarged image zone, for example with effective field of view about 50% as calculating the zone.
Then, the meansigma methods that X ray control part 12 is created on above-mentioned pixel is during less than predefined set-point, the X ray amount is increased, otherwise in above-mentioned meansigma methods during greater than predefined set-point, the X ray control signal that the X ray amount is reduced, the corresponding X ray of control signal that has generated from above-mentioned X-ray tube 3 radiation and this.
The above-mentioned X ray control signal that has generated is and tube voltage, tube current and X ray as the X ray condition any one the corresponding control signal at least of exposing to the sun among the time of penetrating.
Related as follows action of the radioscopic image diagnostic equipment of first kind of embodiment of the present invention of Gou Chenging uses the flowchart text of Fig. 4 to move as mentioned above.
(1) operator sets inspection conditions (step S1) such as check point, radioscopy condition with operator 15.
(2) after the operator set the x-ray bombardment district with X ray diaphragm operator 8, this information was imported into X ray diaphragm control part 9 (step S2).
X ray diaphragm control part 9 generates the position control signal of the X ray blade of diaphragm of the movable aperture device 4 of X ray, and this position control signal is used to make it to become the irradiated region of above-mentioned setting, by this control signal control X ray movable aperture device 4 that has generated.
(3) X ray diaphragm control part 9 will be exported to effective field of view control part 10 with the corresponding effective field of view area information of setting with the movable aperture device 4 of X ray in x-ray bombardment district, the X ray of being set up effective area of visual field and X ray plane detector 5 by this effective field of view control part 10 detects regional corresponding relation, and it is exported to image processing part 11 (step S3).
(4) X-ray tube 3 radiation and the corresponding X ray of setting by operator 15 of X ray condition.X ray plane detector 5 detects the radioscopic image data that seen through examinee 2.Image processing part 11 reads in the radioscopic image data (step S4) that detect the zone with the corresponding X ray in above-mentioned effective field of view zone.
(5) image processing part 11 amplifies (step S5) with the radioscopic image in the above-mentioned effective field of view zone of having read in.
(6) image processing part 11 is set the feedback signal that is used for X ray is controlled at above-mentioned radioscopic image zone of having amplified and is calculated zone (step S6).
(7) image processing part 11 is calculated the above-mentioned meansigma methods of having set of calculating the pixel in the zone (step S7).
(8) X ray control part 12 will feed back to X ray control part 12 by the average pixel value that image processing part 11 has been calculated.X ray control part 12 and then when above-mentioned feedback during less than predefined set-point, generates the X ray control signal in the meansigma methods of above-mentioned pixel, and the X ray amount is increased.Otherwise X ray control part 12 during greater than predefined set-point, generates the X ray control signal (step S8) that reduces the X ray amount in above-mentioned meansigma methods.
(9) X ray control part 12 usefulness are carried out radioscopy with the above-mentioned X ray control signal corresponding X ray that has generated.Display part 14 shows the fluoroscopy images (step S9) that carries out above-mentioned radioscopy and obtain.
Like this, first kind of embodiment of the present invention is the effective field of view zoom with X ray plane detector, sets given zone in this enlarged image zone, and the meansigma methods of the pixel that this is regional feeds back to the X ray control part, and X ray is controlled.
Thereby, even above-mentioned effective field of view reduces because of moving, also can be to control X ray with the corresponding X ray condition in this visual field.Therefore, after check point positions the X ray plane detector 5 as camera system, do not need to make this X ray plane detector 5 to move,, can make the radioscopic image in Narrow Field Of Vision zone become images with high image quality yet even X ray plane detector is the wide visual field.
In addition, the feedback signal that is used for revisal X ray control signal calculate the zone constitute can according to check point, diagnostic purpose or operator's indication arbitrarily change get final product, thereby, can make the radioscopic image in the Narrow Field Of Vision zone of the diagnostic purpose that the operator expects become images with high image quality.Also having, is to carry out computing according to magnification region at this, but also can be with feeding back based on the value in the zone before amplifying.
(second kind of embodiment)
In above-mentioned first kind of embodiment, shown in Fig. 3 (III), if effective field of view b
c
d
E ground reduces, and be area identical in display frame, and on examinee 2, the zone of calculating of above-mentioned feedback signal becomes too little.Calculate the zone for this kind, can consider to have, thereby can not get the situation of stable radioscopy image because of the bone of calculating the zone existence at this, the small X ray absorbance that has or not in lung district change a lot.
This is because if the above-mentioned zone of calculating reduces, and very big change takes place the meansigma methods that enters pixel value because of bone, lung district.
To this, second kind of embodiment of the present invention is the zone mode variable corresponding to the size of effective field of view of calculating that makes feedback signal, is explained with Fig. 5.
Fig. 5 (I) is the output image (image of a) in the full visual field of X ray plane detector 5.Fig. 5 (II) is the image that the effective field of view zone with dashed lines frame with the movable aperture device 4 restriction x-ray bombardment district gained of X ray is got up to represent.Fig. 5 (III) is effective image b, c, d, the e as the effective field of view zone of above-mentioned (II).Fig. 5 (IV) is the zoom with Fig. 5 (III), image b1, the c1, d1, the e1 that are got up with solid box in 50% zone of this enlarged image.Fig. 5 (V) be to the enlarged image of Fig. 5 (IV) according to the zone of calculating that its amplification increases feedback signal, this is calculated b2, the c2 that gets up with solid box in the zone, the image of d2, e2, be by b
c
d
The order of e has been dwindled the example of effective field of view.
That is, the zone of calculating of above-mentioned feedback signal is:
(1) in the occasion of the image of b, effective field of view is amplified (image of b1), 50% of this image that has amplified is calculated zone (zone of getting up with solid box of b2) as feedback signal.
(2) in the occasion of the image of c, effective field of view is amplified (image of c1), 60% of this image that has amplified is calculated zone (zone of getting up with solid box of c2) as feedback signal.
(3) in the occasion of the image of d, effective field of view is amplified (image of d1), 70% of this image that has amplified is calculated zone (zone of getting up with solid box of d2) as feedback signal.
(4) in the occasion of the image of e, effective field of view is amplified (image of e1), 80% of this image that has amplified is calculated zone (zone of getting up with solid box of e2) as feedback signal.
(5) then, when effective field of view is minimum, also can be 100% the zone of calculating of this effective field of view being amplified the image of gained as feedback signal.
Like this, second kind of embodiment involved in the present invention is along with effective field of view reduces, and makes feedback signal calculate the mode of zone with respect to the ratio increase of effective field of view.Calculate the zone for above-mentioned feedback signal, for example, the relation of the ratio in the zone of calculating above-mentioned feedback signal with effective field of view with according to amplification and this enlarged image of this effective field of view carry out formization in advance.Amplify with the above-mentioned amplification that has carried out the effective field of view of formization with the corresponding image of the effective field of view of obtaining by effective field of view control part 10.This image-region that has amplified multiply by the ratio that above-mentioned feedback signal of having carried out formization is calculated the zone, obtains this feedback signal and calculates the zone.Perhaps the feedback signal ratio of calculating the zone that the zone also can be by calculating above-mentioned feedback signal with above-mentioned effective field of view, according to amplification and this enlarged image of this effective field of view is carried out sequencing as variable, thereby calculates.
Above-mentioned feedback signal is calculated the zone and is taken as from clinical experience with respect to the ratio of effective field of view and says to have rational value.It is different because of check point, so when obtaining with reference to above-mentioned data of having carried out formization, or when being obtained by program, will consider that all above-mentioned check point sets.
Then, X ray control part 12 during less than predefined set-point, generates the X ray control signal in the meansigma methods of above-mentioned pixel, the X ray amount is increased, from the control signal corresponding X ray of above-mentioned X-ray tube 3 radiation with this generation.Otherwise X ray control part 12 during greater than predefined set-point, generates the X ray control signal that reduces the X ray amount in above-mentioned meansigma methods, from the control signal corresponding X ray of above-mentioned X-ray tube 3 radiation with this generation.
The above-mentioned X ray control signal that has generated is and tube voltage, tube current and X ray as the X ray condition any one the corresponding control signal at least of exposing to the sun among the time of penetrating.
Related as described below action of the radioscopic image diagnostic equipment of second kind of embodiment of the present invention of Gou Chenging uses the flowchart text of Fig. 6 to move as mentioned above.
(1) sets inspection conditions (step S11) such as check point, radioscopy condition from the operator with operator 15, to the processing till the amplification of the radioscopic image in the effective field of view zone (step S15) is identical with above-mentioned first kind of embodiment, so omit its explanation.
(2) image processing part 11 is set feedback signal in the radioscopic image zone of having been amplified by step S15 and is calculated zone (step S16).This feedback signal is calculated the zone and is increased with given ratio accordingly with the size of above-mentioned effective field of view and set, and it is reduced along with effective field of view and becomes big zone.
(3) image processing part 11 is calculated the above-mentioned meansigma methods of having set of calculating the pixel in the zone (step S17).
(4) image processing part 11 feeds back to X ray control part 12 with above-mentioned average pixel value of having calculated.X ray control part 12 during less than predefined set-point, generates the X ray control signal in the meansigma methods of above-mentioned pixel, and the X ray amount is increased.Otherwise X ray control part 12 during greater than predefined set-point, generates the X ray control signal that reduces the X ray amount in above-mentioned meansigma methods.(step S18).
(5) operator 15 usefulness are carried out radioscopy with the above-mentioned corresponding X ray of X ray control signal that has generated, and this fluoroscopy images is presented at display part 14 (step S19).
According to above-mentioned second kind of embodiment, feedback signal is calculated the zone be made as along with effective field of view reduces and increases above-mentioned feedback signal and calculate the zone with respect to the ratio of effective field of view.Because of this control, it is narrow more to have eliminated effective field of view, and the light exposure of X ray is low more, when the image of the different effective field of view of range being taken into account photography, and the situation that the light exposure of each image is different.
In addition, the feedback signal that is used for revisal X ray control signal is calculated the ratio of zone with respect to effective field of view, is not limited to the situation of above-mentioned Fig. 5, but also can sets arbitrarily.
Also have, can at random change accordingly with check point, diagnostic purpose or operator's indication.
(the third embodiment)
In above-mentioned second kind of embodiment, even effective field of view is set minimumly, also can there be bone etc. in 100% zone of calculating as feedback signal of the image that will amplify this effective field of view in above-mentioned part of calculating the zone sometimes.At this moment, should consider that so above-mentioned meansigma methods change of calculating the pixel value in the zone is very big, it is too big that above-mentioned feedback signal becomes, and can not carry out the situation of stable X ray control because the X ray absorbance of bone is big.
This be because, for example inserting conduit sometimes, carry out radioscopy and photography repeatedly after, only show the front end of conduit by medicament input etc., in the hope of reducing being shone of examinee.At this moment, because image conversion is carried out in the zone to 2～3cm degree on the examinee, so make the meansigma methods of pixel be subjected to very big influence because of the existence of conduit, lead.
Fig. 7 is the key diagram that the related feedback signal of the third embodiment of the present invention when setting effective field of view minimum is calculated.
This Fig. 7 is illustrated in the image in the process of size variation of effective field of view and the figure of X ray condition at that time, and the size of effective field of view is pressed e
f
g
h
i
K changes, and can become the size of minimum effective field of view sometimes at the h place.At this moment, feedback signal is not calculated at size h place in this visual field, thereby maintains the X ray condition Xg under the visual field size of g of big or small h front, this visual field, carries out radioscopy under this X ray condition.
Then, be exaggerated in the visual field, when having become j big or small, begin calculating of feedback signal again, the size to the visual field of k continues calculating of feedback signal, carries out radioscopy under the X ray condition that the feedback signal of having calculated with this generates.
So, whether be the threshold value of calculating the size in the visual field of feedback signal to the size setting of effective field of view, i.e. the threshold value of the size of effective field of view when the size in effective visual field is this size when following, is not calculated feedback signal.Replace, use with X ray condition and carry out radioscopy,, begin calculating of feedback signal again having become the time point that surpasses the visual field size of above-mentioned threshold value greater than the immediate visual field of the threshold value size of the size of the above-mentioned effective field of view of above-mentioned visual field size.
Among above-mentioned Fig. 7, the threshold value that makes the size of above-mentioned effective field of view is visual field when size of g, and the X ray condition is as follows.
(1) situation of e is that effective field of view with the b of above-mentioned Fig. 5 amplifies, with 50% zone of this image that has amplified as feedback signal calculate the zone time situation, use and calculate the feedback signal of calculating in the zone by this to have carried out the X ray condition of revisal be Xe.
(2) situation of f is that effective field of view with the c of above-mentioned Fig. 5 amplifies, with 60% zone of this image that has amplified as feedback signal calculate the zone time situation, use and calculate the feedback signal of calculating in the zone by this to have carried out the X ray condition of revisal be Xf.
(3) situation of g is that effective field of view with the d of above-mentioned Fig. 5 amplifies, with 70% zone of this image that has amplified as feedback signal calculate the zone time situation, use and calculate the feedback signal of calculating in the zone by this to have carried out the X ray condition of revisal be Xg.
(4) situation of h is that effective field of view with the e of above-mentioned Fig. 5 amplifies, with 80% zone of this image that has amplified as feedback signal calculate the zone time situation, but the size of the effective field of view of this moment is below the threshold value of size of above-mentioned effective field of view.Therefore, do not calculate feedback signal, and keep the identical Xg of X ray condition with the g of above-mentioned (3).
(6) situation of j is that the h of effective field of view than above-mentioned (4) amplified more, with 70% zone of this image that has amplified as feedback signal calculate the zone time situation, the size of effective field of view is more than the threshold value.Therefore, begin calculating of feedback signal again, use and calculate the feedback signal of calculating in the zone by this to have carried out the X ray condition of revisal be Xj.
(7) this situation is that the j of effective field of view than above-mentioned (5) amplified more, with 60% zone of this image that has amplified as feedback signal calculate the zone time situation, use and calculate the feedback signal of calculating in the zone by this to have carried out the X ray condition of revisal be Xk.
Related as described below action of the radioscopic image diagnostic equipment of second kind of embodiment of the present invention of Gou Chenging uses the flowchart text of Fig. 8 to move as mentioned above.
(1) sets inspection conditions (step S21) such as check point, radioscopy condition from the operator with operator 15, to the processing till the amplification of the radioscopic image in the effective field of view zone (step S25) is identical with above-mentioned first kind of embodiment, so omit its explanation.
(2) size (effective field of view zone) of judging above-mentioned effective field of view whether with the storage part that is stored in above-mentioned image processing part 11 in advance in the threshold value of size of effective field of view be equal above (step S26).When the threshold value of the size of the size of above-mentioned effective field of view and above-mentioned effective field of view is equal when above, enter step S27, on the other hand, when the size of above-mentioned effective field of view is that the threshold value of size of above-mentioned effective field of view is when following, enter step S30, carry out each self-corresponding processing.
(3) when the threshold value of the size of the size of above-mentioned effective field of view and above-mentioned effective field of view be equal when above, calculate zone (step S27) in above-mentioned radioscopic image zone setting feedback signal of having amplified.
(4) image processing part 11 is calculated the above-mentioned meansigma methods of having set of calculating the pixel in the zone (step S28).
(5) image processing part 11 feeds back to X ray control part 12 with above-mentioned average pixel value of having calculated.X ray control part 12 during less than predefined set-point, generates the X ray control signal in the meansigma methods of above-mentioned pixel, and the X ray amount is increased.Otherwise X ray control part 12 during greater than predefined set-point, generates the X ray control signal that reduces the X ray amount in above-mentioned meansigma methods.(step S29).
(6) when the size of the above-mentioned effective field of view of having set be the threshold value of size of above-mentioned effective field of view when following, will read from above-mentioned storage part with the X ray condition of the size of effective field of view in the immediate storage part that is stored in above-mentioned X ray control part 12 of the threshold value of the size of above-mentioned effective field of view.X ray control part 12 generates the X ray control signal according to this X ray condition of having read.(step S30).
(7) X ray control part 12 usefulness are carried out radioscopy with the above-mentioned X ray control signal corresponding X ray that has generated.Display part 14 shows the fluoroscopy images (step S31) of this radioscopy gained.
So, in the third embodiment of the present invention, image processing part 11 is provided with the threshold value of the size of effective field of view, and the size of this threshold value and the effective field of view set is compared.Image processing part 11 so when the size of above-mentioned effective field of view and above-mentioned threshold value be equal when above, calculate feedback signal, generate the X ray control signal according to this feedback signal of having calculated, X ray is had an X-rayed in control.When the size of above-mentioned effective field of view is above-mentioned threshold value when following, promptly during effective field of view big or small minimum, do not calculate feedback signal, use with the immediate effective field of view size of above-mentioned threshold value under X ray condition control perspective X ray.Control because be made as so, so, also can not influenced by it, and carry out stable X ray control even calculate the zone when having the high bone of X ray absorbance, conduit, lead etc. in above-mentioned feedback signal.Thereby can access the radioscopy image of high image quality.
In addition, the feedback signal that is used for revisal X ray control signal is calculated the ratio of zone with respect to effective field of view, is not limited to above-mentioned Fig. 7, but also can sets arbitrarily.
Also have, can at random change accordingly with check point, diagnostic purpose or operator's indication.
Also have, imagination does not change the size of the effective field of view of X ray plane detector (5), and the situation that the position of above-mentioned effective field of view is moved with the movable aperture device 4 of X ray.At this moment, the time point of effective field of view that need be when having departed from decision and be right after X ray condition before the moving of this effective field of view position, calculating the zone with feedback is 100%, calculate feedback signal.
Also be that effective field of view control part 10 obtains feedback signal from X ray diaphragm control part 9 and calculates needed information this moment, calculates feedback signal by image processing part 11.
According to present embodiment, after by check point X ray plane detector being positioned, this detector is mechanically moved, set x-ray irradiation area with X ray diaphragm unit, obtain the X ray condition with this corresponding the best in zone, X ray is controlled.Because so play a role, the zone obtains the radioscopy image of stable high image quality so X ray plane detector that can enough wide visuals field is from wide area of visual field to Narrow Field Of Vision.
Claims (10)
1. radioscopic image diagnostic equipment has:
X-ray source (3) is to examinee (2) irradiation X ray;
X ray plane detector (5), with this x-ray source (3) facing to configuration, form by a plurality of X ray detecting element two-dimensional arrangements of the transmitted X-rays that detects above-mentioned examinee (2);
X-ray irradiation area setup unit (15) is set the x-ray irradiation area to above-mentioned examinee (2);
X ray diaphragm unit (4) is configured in the x-ray bombardment side of above-mentioned x-ray source (3), X ray is limited in the x-ray irradiation area of having been set by above-mentioned x-ray irradiation area setup unit (15);
X ray diaphragm operating unit (8) is set the desired location of above-mentioned X ray diaphragm unit (4);
X ray diaphragm control unit (9), detect the present position of above-mentioned X ray diaphragm unit (4), and above-mentioned X ray diaphragm unit (4) is moved control from this present position that has detected to the desired location of having set by above-mentioned X ray diaphragm operating unit (8); With
Display unit (14) will be shown as radioscopic image by the transmitted X-rays that above-mentioned X ray plane detector (5) has detected,
It is characterized in that having:
Effective field of view control unit (10) is calculated the effective field of view zone with the corresponding above-mentioned X ray of above-mentioned x-ray irradiation area plane detector (5);
Graphics processing unit (11), corresponding relation is set up with the zone that detects of above-mentioned X ray plane detector (5) in this effective field of view of having calculated zone, read the transmitted X-rays data on the zone of detecting of this above-mentioned X ray plane detector (5) of having set up corresponding relation; With
X ray control unit (12) is based on these transmitted X-rays data of having read, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation.
2. the radioscopic image diagnostic equipment according to claim 1 is characterized in that,
The signal (16) of the present position of the above-mentioned X ray diaphragm unit (4) that above-mentioned effective field of view control unit (10) has been detected by above-mentioned X ray diaphragm control unit (9) according to expression, calculate the amount of feeding back to signal (17) to above-mentioned graphics processing unit (11)
Above-mentioned graphics processing unit (11) transmits to X ray control unit (12) this feedback quantity of having calculated with signal (18),
Above-mentioned X ray control unit (12) transmits the signal (18) of coming based on this, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation.
3. the radioscopic image diagnostic equipment according to claim 1, it is characterized in that, above-mentioned effective field of view control unit (10) is according to the desired location of the above-mentioned X ray diaphragm unit of having been set by above-mentioned X ray diaphragm setup unit (8) (4), calculates to the amount to signal (17) feedback of above-mentioned graphics processing unit (11).
4. the radioscopic image diagnostic equipment according to claim 3, it is characterized in that above-mentioned feedback quantity is in advance with effective field of view with according to the amplification of this effective field of view and this effective field of view is amplified the enlarged image that obtains calculate the relation of ratio in the zone of feedback signal and carry out formization and calculate.
5. the radioscopic image diagnostic equipment according to claim 3, it is characterized in that above-mentioned feedback quantity is with effective field of view, according to the amplification of this effective field of view and this effective field of view is amplified the enlarged image that obtains calculate the ratio in the zone of feedback signal and carry out sequencing as variable and calculate.
6. the radioscopic image diagnostic equipment according to claim 1 is characterized in that,
Above-mentioned effective field of view control unit (10) will be in the desired location of the above-mentioned X ray diaphragm unit (4) that has been detected by above-mentioned X ray diaphragm operating unit (8), the transmitted X-rays that has been detected by above-mentioned X ray plane detector (5) passes to above-mentioned graphics processing unit (11)
Above-mentioned graphics processing unit (11) will transmit next transmitted X-rays as radioscopic image, and this radioscopic image is carried out processing and amplifying,
Above-mentioned X ray control unit (12) is based on the radioscopic image data of this processing and amplifying gained, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation.
7. the radioscopic image diagnostic equipment according to claim 1 is characterized in that,
Above-mentioned x-ray irradiation area setup unit (15) is set the threshold value of the size in above-mentioned effective field of view zone,
The size in the effective field of view zone of the above-mentioned X ray plane detector (5) that above-mentioned graphics processing unit (11) has been calculated with this threshold value of having set with by above-mentioned effective field of view control unit (10) compares,
Above-mentioned X ray control unit (12) compares the result of gained based on this, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation.
8. the radioscopic image diagnostic equipment according to claim 7, it is characterized in that, above-mentioned X ray control unit (12), in the result of above-mentioned relatively gained during more than or equal to above-mentioned threshold value, based on the radioscopic image data of having read, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation by above-mentioned graphics processing unit (11).
9. the radioscopic image diagnostic equipment according to claim 7, it is characterized in that, above-mentioned X ray control unit (12), in the result of above-mentioned relatively gained during less than above-mentioned threshold value, based on the above-mentioned threshold value proximate radioscopic image data that detected by above-mentioned X ray plane detector (5) in advance, to controlling from the X ray amount of above-mentioned x-ray source (3) radiation.
10. according to any one described radioscopic image diagnostic equipment of claim 2～5, it is characterized in that, be the meansigma methods of each pixel of existing in the zone of the effective field of view of having been calculated by above-mentioned effective field of view control unit (10) to amount to the signal (17) of above-mentioned graphics processing unit (11) feedback.
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| JP2009183334A (en) * | 2008-02-04 | 2009-08-20 | Hitachi Medical Corp | X-ray fluoroscopic system |
| JP5390786B2 (en) * | 2008-04-25 | 2014-01-15 | 株式会社日立メディコ | X-ray fluoroscopic imaging apparatus and X-ray fluoroscopic imaging method |
| JP5619535B2 (en) | 2009-10-23 | 2014-11-05 | 株式会社東芝 | X-ray diagnostic equipment |
| CN102525491B (en) * | 2010-12-15 | 2015-12-02 | 深圳迈瑞生物医疗电子股份有限公司 | X-ray arm holder for radiographic imaging apparatus and beam-defining clipper light wild control method, device |
| CN102961157A (en) * | 2011-08-30 | 2013-03-13 | 斯堪莱斯医疗有限公司 | A system and method for controlling radiant quantity of x-rays emitted in a fluoroscopy system |
| JP6026104B2 (en) * | 2011-12-20 | 2016-11-16 | 東芝メディカルシステムズ株式会社 | X-ray diagnostic equipment |
| WO2013115389A1 (en) * | 2012-02-01 | 2013-08-08 | 株式会社東芝 | Medical image diagnostic device |
| JP6218365B2 (en) * | 2012-08-08 | 2017-10-25 | 東芝メディカルシステムズ株式会社 | Medical diagnostic imaging equipment |
| CN104434148B (en) * | 2013-09-12 | 2019-01-08 | 上海联影医疗科技有限公司 | A kind of control method of X-ray shooting system |
| JP6923323B2 (en) | 2017-01-23 | 2021-08-18 | キヤノンメディカルシステムズ株式会社 | X-ray diagnostic equipment |
| CN110742630A (en) * | 2019-09-17 | 2020-02-04 | 深圳蓝韵医学影像有限公司 | Method and device for collecting X-ray image |
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| JP2003250789A (en) * | 2002-02-28 | 2003-09-09 | Canon Inc | Radiation imaging apparatus, program, and computer- readable storage medium |
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| US5253169A (en) * | 1991-11-29 | 1993-10-12 | General Electric Company | Method and apparatus for reducing x-ray dosage during fluoroscopic examinations |
| US5278887A (en) * | 1992-06-29 | 1994-01-11 | Siemens Corporate Research, Inc. | Apparatus and method for reducing X-ray dosage during a fluoroscopic procedure |
| CN1454569A (en) * | 2002-02-07 | 2003-11-12 | 株式会社东芝 | X-ray diagnosis apparatus |
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