JPH0955298A - Method and device for fluoroscopic photographing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a means value of fluoroscopic picture image values, a histogram, and a central value of the picture element values of the irradiated portion of a product to be examined from the histogram, to select an X-ray photographic sensor from a compared result between the means value and the central value, to control photographing time. SOLUTION: In a sensor selection deciding part 23, a signal, in accordance with the felt region of photographing sensors 41a-41c, is sampled as a detection signal by receiving image data from a image memory 12, to produce a histogram about a mean value of picture element values and an occurrence frequency of the picture element values, at respective regions. In the part 23, a nonirradiated portion, a directly irradiated portion, and the irradiated portion of a product to be examined are recognized from the histogram, to produce a central value of the picture element values of the irradiated portion of the product to be examined, to compare the means value and the central value, and finally to select a photographing sensor to be used for X-ray photographing. At least one side of fluoroscopy or X-ray photographing is made by controlling an X-ray photographing time by using the detected signal of the selected photographing sensor.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to X-ray fluoroscopy or X-ray imaging.
X-ray fluoroscopic imaging method and at least one of X-ray imaging
The present invention relates to a fluoroscopic imaging apparatus, and more particularly, to an X-ray fluoroscopic imaging method and an X-ray fluoroscopic imaging apparatus capable of appropriately selecting a sensor used for fluoroscopy or imaging.

[0002]

2. Description of the Related Art In a conventional X-ray fluoroscopic imaging apparatus, first, X
The image of the subject is confirmed and positioned by fluoroscopy. That is, the X-rays emitted from the X-ray tube device pass through the collimator in the open state and the subject, and are visualized while being amplified by an image intensifier (hereinafter referred to as II) as an X-ray fluoroscopic image, This visible image is converted into a video signal by the TV camera. Then, this video signal is subjected to predetermined processing by the image processing device and is displayed as an image on the CRT display device.

The operator moves the fluoroscopic imaging stand (or II) by driving the moving mechanism through the operation console while checking the fluoroscopic image on the display screen of the CRT display device to move the desired object of the subject. Positioning is performed so that a fluoroscopic image of the site is obtained.

Then, when the positioning is completed, the X-ray film photographing is executed. Here, X-ray fluoroscopy to the CRT display device is turned off, and the quick shooting device moves from the retracted position to the predetermined shooting position.

After that, X-ray irradiation for photographing is performed, and the film in the quick-shooting device is exposed with an X-ray image. When the exposure of the film of the X-ray image is completed, the quick shooting device returns to the retracted position. In the above cases, the brightness of the image displayed on the CRT display device is determined by ABC (Automatic Bright
ness control) called automatic brightness adjustment.

The ABC is a kind of gain control for controlling the X-ray output by the brightness of the CRT display screen and keeping the brightness of the obtained image constant even if the X-ray absorption of the subject changes. .

For example, in this ABC, as shown in FIG. 8, the ABC sensor area 3 in the vicinity of the central portion of the substantially circular II perspective area appearing on the CRT display screen 1 is subjected to average photometry, and the photometric value is constant. The X-ray output is controlled so that

[0008]

However, when barium is drunk during a gastric examination or the like, the above-mentioned central portion is covered with barium, so that the barium has a fluoroscopic condition such that the brightness of the CRT display screen is optimum ( The tube voltage kV and the tube current mA) of the X-ray tube are determined. Therefore, the brightness is uneven. On the contrary, when ABC is performed in the air portion, a bias occurs in the opposite direction, and the same problem occurs.

Further, the collimator narrows the irradiation field,
Even when the irradiation field is narrower than the ABC sensor area, there is a problem that proper control cannot be performed. Therefore, it is desirable to prepare a plurality of sensors similar to those for taking a photograph, which will be described later, and selectively use them.

On the other hand, in X-ray photography, for example, three sensors are prepared and one of the sensors is selected so as to avoid a region covered with barium or a region filled with air. Then, using the output of the selected sensor, the exposure control (AEC: Automatic Exposion C
ontrol). For this exposure control,
The control of X-ray imaging time (exposure time) and the like are applicable. As a result, the result of photography can be set to the optimum density.

For example, in the chest radiographing apparatus as shown in FIG. 9, since the patient is stationary, it is possible to perform the positioning while looking at the sensor position marking provided in advance.

However, in the case of the gastric imaging apparatus, in addition to the movement of the patient during the examination, it is operated remotely, which makes it difficult to confirm the positional relationship between the sensor and the subject. There is.

The present invention has been made to solve the above-mentioned problems, and has the following objects. (1) To realize an X-ray fluoroscopic imaging method and an X-ray fluoroscopic imaging apparatus capable of selecting an imaging sensor suitable for controlling X-ray imaging time by referring to a fluoroscopic image.

(2) By determining the fluoroscopic condition from the fluoroscopic image on the position of the imaging sensor, an X-ray fluoroscopic imaging apparatus capable of matching the fluoroscopic and radiographic conditions is realized. (3) An X-ray fluoroscopic imaging apparatus capable of grasping the relationship between radiography and fluoroscopy is realized by superimposing and displaying the position of the imaging sensor selected for determining radiographic conditions on a fluoroscopic image.

(4) To realize an X-ray fluoroscopic imaging apparatus capable of performing correction when determining fluoroscopic conditions and radiographic conditions.

[0016]

That is, the present invention as a means for solving the problem is as described below.

A first aspect of the invention for achieving the above-mentioned object (1) is provided with a plurality of photographing sensors for controlling exposure during X-ray photographing, and at least one of the plural photographing sensors is provided. In the X-ray fluoroscopic imaging method of performing at least one of X-ray fluoroscopy and X-ray imaging by controlling the X-ray imaging time based on the detection signal of the selected imaging sensor, An average value of fluoroscopic pixel values and a histogram are generated for each region of the corresponding X-ray fluoroscopic image, and a non-irradiation field portion, a direct irradiation field portion, and an irradiation field portion (substantial irradiation field portion) of the subject are generated from the histogram. By recognizing and generating a representative value representing the pixel value of the irradiation field portion of the subject, comparing the average value with the representative value, and selecting at least one imaging sensor to be used for X-ray imaging, Selected X-ray fluoroscopy or X by controlling the X-ray imaging time by using a detection signal of the imaging sensor
An X-ray fluoroscopic imaging method is characterized in that at least one of radiography is performed.

In the first aspect of the present invention, an average value of fluoroscopic pixel values and a histogram are generated in a region of the X-ray fluoroscopic image corresponding to the imaging sensor, and the non-irradiation field portion, the direct irradiation field portion, and the subject are generated from the histogram. Of the irradiation field portion is generated and a representative value representing the pixel value of the irradiation field portion of the subject is generated.
Then, the average value and the representative value are compared, and at least one sensor used for X-ray imaging is selected based on the comparison result. A control signal for controlling X-ray imaging time is generated using the detection signal of the sensor thus selected, and X-ray fluoroscopy or X-ray imaging is performed by this control signal.

As a result, an X-ray fluoroscopic imaging method is realized in which an imaging sensor suitable for controlling X-ray imaging time can be selected by referring to the fluoroscopic image. A second invention for achieving the above-mentioned object (1) is provided with a plurality of imaging sensors for exposure control during X-ray imaging, and at least one of the imaging sensors is selected. In the X-ray fluoroscopic imaging apparatus that performs at least one of X-ray fluoroscopy and X-ray imaging by controlling the X-ray imaging time based on the detection signal of the selected imaging sensor, the plurality of imaging sensors are supported. A mean value / histogram generating means for generating a mean value and a histogram of fluoroscopic pixel values for each area of the X-ray fluoroscopic image to be generated, and a non-irradiation field portion and a direct irradiation field from the histogram generated by the mean value / histogram generating means. The representative value generating means for recognizing the portion and the irradiation field portion of the subject to generate a representative value representative of the pixel value of the irradiation field portion of the subject, and the average value / histogram generating means. And a sensor selection unit that compares at least one imaging sensor used for X-ray imaging by comparing the generated average value with the representative value generated by the representative value generation unit. A control signal for controlling X-ray imaging time is generated using a detection signal of the selected sensor or a combined detection signal, and at least one of X-ray fluoroscopy and X-ray imaging is performed using this control signal. X-ray fluoroscopic imaging device.

In the second aspect of the present invention, an average value of fluoroscopic pixel values and a histogram are generated in a region of the X-ray fluoroscopic image corresponding to the imaging sensor, and the non-irradiation field portion, the direct irradiation field portion, and the coverage area are generated from the histogram. The irradiation field portion of the sample is recognized and a representative value representing the pixel value of the irradiation field portion of the subject is generated. Then, the average value and the representative value are compared, and at least one sensor used for X-ray imaging is selected based on the comparison result. A control signal for controlling X-ray imaging time is generated using the detection signal of the sensor thus selected, and X-ray fluoroscopy or X-ray imaging is performed by this control signal.

As a result, it is possible to realize an X-ray fluoroscopic imaging apparatus capable of selecting an imaging sensor suitable for controlling the X-ray imaging time by referring to the fluoroscopic image. A third aspect of the invention for achieving the above-mentioned object (1) is to use the average value /
Obtain the difference between the average value and the representative value generated by the representative value generating means for each of the areas of the plurality of sensors obtained by the histogram generating means, and compare the difference with a preset threshold value, It is preferable to select the sensor that gives the average value closest to the representative value from the sensors having the difference equal to or less than the threshold value as a method of selecting the optimum sensor for controlling the X-ray imaging time.

In the above-mentioned third invention, when the photographing sensor is selected in the above-mentioned second invention, the difference between the average value and the representative value for the areas of the plurality of sensors is obtained and the difference is preset. The sensor that gives the average value closest to the representative value is selected from the sensors whose difference is less than or equal to the threshold value.

As a result, it becomes possible to select an imaging sensor suitable for controlling the X-ray imaging time. A fourth aspect of the invention for achieving the above-mentioned object (1) is to use the average value /
Obtain the difference between the average value and the representative value generated by the representative value generating means for each of the areas of the plurality of sensors obtained by the histogram generating means, and compare the difference with a preset threshold value, If there is a sensor whose difference is less than or equal to the threshold value, select the sensor that gives the average value closest to the representative value from among them, and if there is no sensor whose difference is less than or equal to the threshold value. Selecting the sensor having the average value closest to the representative value of the plurality of sensors so that the combined value of the average values is within the threshold value selects the most suitable sensor for the X-ray imaging time control. It is more preferable as a method.

In the above-mentioned fourth invention, when the photographing sensor is selected in the above-mentioned second invention, the difference between the average value and the representative value for the areas of the plurality of sensors is obtained and the difference is preset. The sensor that gives the average value that is the closest to the representative value is selected from the sensors whose difference is less than or equal to the threshold value when there is no sensor whose difference is less than or equal to the threshold value. A sensor having an average value closest to the representative value of the plurality of sensors is selected so that the combined value of the average values is within the threshold value.

As a result, even when the difference between the average value and the representative value exceeds the threshold value, it is possible to select the imaging sensor suitable for the X-ray imaging time control. A fifth invention for achieving the above-mentioned object (2) is provided with a plurality of imaging sensors for exposure control during X-ray imaging, and at least one of the imaging sensors is selected, In an X-ray fluoroscopic imaging apparatus that performs at least one of X-ray fluoroscopy and X-ray imaging by controlling an X-ray imaging time based on a detection signal of the selected imaging sensor, an X corresponding to the plurality of imaging sensors. An average value generation unit that generates an average value of the perspective pixel values for each area of the line perspective image, and the perspective condition is determined from the average value of the pixel values of the areas on the perspective image corresponding to the selected one or a plurality of sensors. And a fluoroscopic condition determining means for generating a fluoroscopic condition control signal for performing fluoroscopy, and performing fluoroscopy using the fluoroscopic condition control signal.

In the above-mentioned fifth invention, at least one of the plurality of imaging sensors is selected, and a control signal for controlling the X-ray imaging time is generated based on the detection signal of the selected imaging sensor. , When performing at least one of X-ray fluoroscopy or X-ray radiography using the control signal, it is possible to determine the fluoroscopic condition from the average value of the pixel values of the regions on the fluoroscopic image corresponding to the selected one or more sensors. A perspective condition control signal is generated.

As a result, by determining the fluoroscopic condition from the fluoroscopic image on the position of the imaging sensor, it is possible to realize an X-ray fluoroscopic imaging apparatus capable of matching the fluoroscopic and radiographic conditions. A sixth invention for achieving the above-mentioned object (3) is provided with a plurality of imaging sensors for exposure control during X-ray imaging, and at least one of the imaging sensors is selected, X based on the detection signal of the selected imaging sensor
In an X-ray fluoroscopic imaging device that performs at least one of X-ray fluoroscopy or X-ray imaging by controlling the radiographic time, areas on the fluoroscopic image corresponding to respective sensitive areas of the sensor are stored in advance, An X-ray fluoroscopic imaging apparatus is provided with a display control means capable of superimposing and displaying one or a plurality of areas thereof on a fluoroscopic image.

In the sixth aspect of the invention, at least one of the plurality of photographing sensors is selected, and the X-ray photographing time is controlled by using the detection signal or the combined detection signal of the selected photographing sensors. When performing at least one of fluoroscopy and X-ray imaging, areas on the fluoroscopic image corresponding to respective sensitive areas of the imaging sensor are stored in advance,
The area of the selected imaging sensor is displayed so as to be superimposed on the fluoroscopic image.

As a result, by superimposing and displaying the position of the photographing sensor selected for determining the photographing condition on the fluoroscopic image, it is possible to grasp the relationship between photographing and fluoroscopy. A seventh invention for achieving the above-mentioned object (4) is provided with a plurality of fluoroscopic sensors for controlling X-ray fluoroscopic conditions and a plurality of imaging sensors for exposure control during X-ray imaging, At least one of a plurality of imaging sensors for exposure control of X-ray imaging is selected, and the X-ray imaging time is controlled based on the detection signal of the selected imaging sensor, whereby X-ray fluoroscopy or X-ray imaging is performed. In an X-ray fluoroscopic imaging apparatus that performs at least one of the above, an imaging sensor area pixel average value obtained by averaging pixel values of areas on a fluoroscopic image corresponding to the selected one or more imaging sensors, and Value calculating means for obtaining an average value of fluoroscopic sensor area pixels obtained by averaging pixel values of areas on the fluoroscopic image corresponding to the sensor for observation, and an average value of these sensor area pixels for imaging and fluoroscopic sensor area pixels From the average value, A correction signal generating unit that generates a correction signal that corrects the detection signal of the fluoroscopic sensor, and a fluoroscopic condition that generates a fluoroscopic condition control signal for determining the fluoroscopic condition from the detection signal of the fluoroscopic sensor and the correction signal. An X-ray fluoroscopic imaging apparatus comprising a signal generating means and performing fluoroscopy using the fluoroscopic condition control signal.

According to the seventh aspect of the invention, at least one of the imaging sensors is selected, and the X-ray imaging time is controlled by using the detection signal or the combined detection signal of the selected one imaging sensor to perform X-ray fluoroscopy. Alternatively, when at least one of X-ray imaging is performed, the imaging sensor area pixel average value obtained by averaging the pixel values of the areas on the fluoroscopic image corresponding to the selected one or more imaging sensors, and the fluoroscopic To obtain the fluoroscopic sensor area pixel average value obtained by averaging the pixel values of the area on the fluoroscopic image corresponding to the sensor, from these imaging sensor area pixel average value and fluoroscopic sensor area pixel average value, A correction signal for correcting the detection signal of the imaging sensor is generated, and a fluoroscopic condition control signal for determining the fluoroscopic condition is generated from the detection signal and the correction signal of the fluoroscopic sensor,
Fluoroscopy is performed using this fluoroscopy condition control signal.

As a result, the fluoroscopic condition is corrected by the detection signal of the photographing sensor, and the consistency in the exposure control between the fluoroscopic and photographing can be maintained. An eighth invention for achieving the above-mentioned object (4) comprises a fluoroscopic sensor for controlling X-ray fluoroscopic conditions and a radiographic sensor for exposure control during X-ray imaging. In an X-ray fluoroscopic imaging apparatus that performs at least one of X-ray fluoroscopy and X-ray imaging by controlling the X-ray imaging time using the detection signal of the sensor for measurement, from the histogram of the entire fluoroscopic image or an area divided into several parts. The non-irradiation field portion, the direct irradiation field portion, and the irradiation field portion of the subject are recognized, and representative value generating means for generating a representative value representative of the pixel value of the irradiation field portion of the subject, and a fluoroscopic sensor are supported. A pixel average value calculating means for obtaining a fluoroscopic sensor area pixel average value obtained by averaging pixel values of areas on a perspective image; a representative value generated by the representative value generating means; and the pixel average value calculating means Calculated perspective sensor A correction signal generating means for generating a correction signal for correcting the detection signal of the photographing sensor from two of the area pixel average value, and a photographing condition control signal from the detection signal of the photographing sensor and the correction signal. An X-ray fluoroscopic imaging apparatus comprising: an imaging condition control signal generating means for generating an image and performing imaging using this imaging condition control signal.

In the above-mentioned eighth invention, when at least one of X-ray fluoroscopy and X-ray imaging is performed by controlling the X-ray imaging time by using the detection signal of the imaging sensor,
Recognize the non-irradiation field portion, the direct irradiation field portion, and the irradiation field portion of the subject from the histogram of the entire fluoroscopic image or a region divided into several areas, and obtain a representative value that represents the pixel value of the irradiation field portion of the subject. An average pixel value of the fluoroscopic sensor area obtained by averaging the pixel values of the area on the fluoroscopic image corresponding to the fluoroscopic sensor is obtained, and an image is taken from the representative value and the average pixel value of the fluoroscopic sensor area pixel. A correction signal for correcting the detection signal of the image sensor is generated, an image pickup condition control signal is generated from the detection signal of the image pickup sensor and the correction signal, and image pickup is performed using this image pickup condition control signal.

As a result, the photographing conditions are corrected by the detection signal of the fluoroscopic sensor, and it becomes possible to maintain the consistency in the exposure control between the fluoroscopy and the photographing. Further, in the above-described invention in which correction is performed using the fluoroscopic sensor, the fluoroscopic sensor is made movable so that the data at the optimum position can be obtained by matching the position of the imaging sensor.

Further, in the above-mentioned sixth and eighth inventions in which correction is performed using the fluoroscopic sensor, it is also preferable to make the fluoroscopic sensor movable because data at an optimum position can be obtained.

[0035]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a flow chart showing a basic processing procedure of an X-ray fluoroscopic imaging method of the present invention and an operation state of the X-ray fluoroscopic imaging apparatus.

FIG. 2 is a block diagram showing the configuration of the main part of the X-ray fluoroscopic imaging apparatus which is the apparatus used in the X-ray fluoroscopic imaging method of the present invention, and FIG. It is a block diagram which shows the schematic structure of the whole.

<Structure (1) of X-ray fluoroscopic imaging apparatus> First,
The overall configuration of the X-ray fluoroscopic imaging apparatus according to the embodiment of the present invention will be described with reference to FIG.

In the X-ray fluoroscopic apparatus having the structure shown in FIG. 3, X-rays are generated by the high voltage generated by the high-voltage generating unit described later.
The X-ray tube 6 performs X-ray irradiation necessary for fluoroscopy or imaging. Then, a perspective image of the subject on the top plate 7 is made visible and enhanced by an image intensifier (Image Intensifier: II) 8, and the visible image is taken by the television camera 9a. Then, the video signal from the television camera 9a is treated as digital data by the signal processing circuit 10 and various necessary image processing is performed. The image-processed image pickup data is returned to an analog video signal and supplied to the display unit 15 to display an image as a perspective image or a photographed image. Further, the film device F can also be used to shoot a film.

Next, the configuration of the main part of the X-ray fluoroscopic apparatus according to the embodiment of the present invention will be described with reference to FIG. An A / D converter (hereinafter referred to as ADC) 11 converts a video signal captured and generated by the television camera 9a into digital data and supplies the digital data to the image memory 12.
/ D conversion means. The image memory 12 is the ADC 11
It is a storage means for accumulating the digital data from the image data in a predetermined unit such as a frame or a field to obtain image data of a predetermined size. The adding unit 13 is an adding unit that adds the image data from the image memory 12 and the sensor position mask data described later. A DA converter (hereinafter, DAC) 14 is a D / A conversion means for converting the digital data added by the adder 13 into an analog video signal. The display unit 15 is an image display unit that receives an analog video signal from the DAC 14 and displays an image, and specifically, various display devices such as a CRT (Cathode-ray Tube) display device and a liquid crystal display device are applicable.

The operation unit 21 is a user interface unit that receives inputs of various operations from the operator, and generates a signal according to the operation content. The main control unit 22 is the operation unit 21.
It is a control means for receiving signals from the fluoroscopic sensor 9b and signals from various parts (not shown) and controlling the parts in a centralized manner. The sensor selection determining unit 23 is a sensor selection determining unit that receives image data from the image data 12 and selects and determines a sensor to be used when performing automatic brightness adjustment.

The sensor position information holding unit 31 is an information holding unit that holds the position information of each of the plurality of sensors, and is configured to output the position information of the plurality of sensors as needed. The sensor position information control unit 32 is a control unit that expands the sensor position information held by the sensor position information holding unit 31 as brightness information on image data. The frame memory 33 includes the sensor position information control unit 32.
It is a storage means for holding the image data of the brightness information developed and generated in.

Photographing sensor 41 (photographing sensor 41a,
41b, 41c) are brightness detecting means for photographing which are arranged at predetermined positions of II and detect the brightness of a plurality of areas.
The sensor signal control unit 42 is a switching control unit that generates a switching control signal for switching and selecting any one or more of the imaging sensors 41a to 41c in accordance with the selection / determination by the sensor selection determining unit 23. The sensor signal switching unit 43 is a switching unit that allows detection signals of one or a plurality of imaging sensors 41a to 41c selected according to the switching control signal from the sensor signal control unit 42 to pass. The integrator 44 is an integrating unit that integrates the detection signal that has passed through the sensor signal switching unit 43. The reference signal generator 45 is a signal generator that generates a reference signal to be compared with the detection signal from the photographing sensor 41 for automatic brightness adjustment. The comparison unit 46 compares the integration result of the integrator 44 with the reference signal from the reference signal generation unit 45 to perform exposure control (AE
The AEC control signal for C) is generated.

The fluoroscopy control unit 51 is a control means for controlling the generation of high voltage for fluoroscopy in accordance with an instruction from the main control unit 22, and the photographing control unit 51 is instructed by the main control unit 22 to generate a high voltage for photographing. The high voltage generator 53 is configured to generate a high voltage necessary for fluoroscopy and radiography according to an instruction from the fluoroscopy control unit 51 and the radiography control unit 52, and apply the high voltage to the X-ray tube 6. There is.

<Operation of X-ray Fluoroscopic Imaging Apparatus> Here, the operation of the X-ray fluoroscopic imaging apparatus will be described with reference to FIG. X-rays from the X-ray tube 6 are transmitted through the subject,
This transmitted X-ray is received by II8. At this time, the video signal from the television camera 9a that has captured the output of II8 is ADC
After being converted into digital data at 11, it is stored in the image memory 12. Then, after being read from the image memory 12 and added to the sensor position mask data described later by the adding unit 13 as necessary, the DAC 14 converts the analog position into an analog video signal and the display unit 15 displays the video in real time. ing. This state is an operation state of fluoroscopy.

The sensor selection determining unit 23 receives the image data from the image memory 12 and receives the image sensor 41.
Signals corresponding to the sensitive areas a to 41c are sampled as detection signals, and the average value of pixel values for each area and
A histogram of the appearance frequency of pixel values is generated (step 1 in FIG. 1). Therefore, the sensor selection determining unit 23 constitutes an average value / histogram generating means.

FIG. 4 (a) is a schematic diagram showing the positional correspondence between the image signals captured by the television camera 9a and the image capturing sensors 41a to 41c. As the image signals, a part of the image signal is imaged with barium. The state of the sample is shown.

Here, the imaging sensor 41c samples an area outside the object, the imaging sensor 41b samples an area of the object, and the imaging sensor 41c samples an area of the object imaged with barium. The case is shown as an example.

There are also cases where there are non-irradiation field portions, direct irradiation field portions, and irradiation field portions of the subject. Considering the case of FIG. 4A as an example, when the histogram and the average value are generated from the detection signals of the sampling results of the respective regions of the imaging sensors 41a to 41c having such an arrangement, FIG. ).

Here, the two-dot chain line characteristic curve A is a histogram generated from the detection signal of the photographing sensor 41a, and since it is the air region, the frequency is high in the portion where the pixel value is large. A'inside the histogram A is the average value of pixel values.

The solid characteristic curve B is a histogram generated from the detection signal of the imaging sensor 41b. Since it is the region of the subject, the frequency is high in the portion where the pixel value is medium. In addition, B ′ inside the histogram B is the average value of the pixel values.

The characteristic curve C indicated by a chain line is the sensor 41 for photographing.
It is a histogram generated from the detection signal of c, and since it is an area imaged by barium, the frequency is high in the portion where the pixel value is small. Further, C ′ inside the histogram C is an average value of pixel values.

The sensor selection determining unit 23 that has generated such a histogram determines the non-irradiation field portion, the direct irradiation field portion, and the irradiation field portion of the subject according to the peak value of the pixel value of each histogram and its variance. (Or
Whether it belongs to the air portion, the subject portion, or the contrast portion of the subject) is recognized (step 2 in FIG. 1). In the case of recognition using this histogram, one histogram may be generated for the entire screen from the fluoroscopic image signal, and the recognition may be performed by referring to the maximum and minimum pixel values of this histogram.

In the case of FIG. 4B, the histogram B is recognized as the irradiation field portion, and a representative value (FIG. 4D) representing the pixel value of the irradiation field portion is generated from the histogram (step 3 in FIG. 1). ). Therefore, the sensor selection determining unit 23
Constitutes a representative value generating means.

Here, the representation of the pixel value means a central value such that the brightness range of the irradiation field of the subject having a certain degree of spread is best described, and for example, a histogram of the actual irradiation field portion. It is determined by the center of gravity of the.

The representative value D generated as described above,
The comparison is performed with the average values A, B, and C of the pixel values in each sensor area. Then, as a result of the comparison, an imaging sensor having an average value close to the representative value D is selected (step 4 in FIG. 1).

As this selection, several modified examples can be considered. One of the imaging sensors having the average value closest to the representative value D is selected. When the difference is less than or equal to a predetermined threshold value by comparing the representative value D and the average value of each imaging sensor to obtain a difference,
One of the imaging sensors having the average value closest to the representative value D is selected.

The representative value D and the average value of each photographing sensor are compared to obtain a difference, and when the difference is less than or equal to a predetermined threshold value, the average value closest to the value of the representative value D. One of the image pickup sensors is selected. If the difference exceeds the threshold,
A plurality of imaging sensors are selected so that the combined value of the average values falls within the threshold range.

According to the above cases, there is an advantage that the processing can be simplified. Further, according to the method, the accuracy can be further improved, but it is necessary to take a measure such as an error when the threshold value is exceeded. According to this, the processing can be surely performed in any case.

In the flow chart of FIG. 5, steps 1 to 3 are the same as those in the flow chart of FIG. 1, and steps 4 to 7 show the states of the above processing or.

The sensor signal control unit 42 controls the switching state of the sensor signal switching unit 43 in response to the determination result of the sensor selection determination unit 23 that has made the determination for selecting the photographing sensor as described above. In this way, the selection of the photographing sensor 41 is executed.

Further, in addition to generating the representative value as described above and selecting the selection of the imaging sensor, it is also possible to set a threshold value from the histogram and select the sensor to be obtained with this threshold value. is there.

In this case, for example, a histogram is generated from the image data of the entire video signal. This histogram has a characteristic that it has peaks in respective portions of the air region, the subject region, and the imaged subject region. Therefore, the minimum value of this histogram is found, and the pixel values having the minimum value are set as the threshold values T1 and T2.

In addition to detecting the minimum value and determining the threshold value, a method of detecting the minimum value between the peak values may be used. Furthermore, since the maximum and minimum pixel values of the histogram can be calculated by the X-ray intensity (tube voltage, tube current, etc.), the maximum and minimum values calculated by the calculation can be used to further determine the threshold. It is also possible to determine the value. For example, the minimum value × 1.1 can be the first threshold value T1 and the maximum value × 0.9 can be the second threshold value T2. In this case, the constants (1.1 and 0.
9) can be changed if necessary.

Then, with respect to the histogram of each sensor area (FIGS. 4A, 4B, 4C), the first threshold value T1 and the second threshold value T2 are set.
Of the histogram sensor having a large area (number of pixels × frequency) in the pixel value of the intermediate portion between the first and second threshold values (T1 to T2). To do. Alternatively, the sensor of the histogram having the maximum value or the maximum value between the first threshold value T1 and the second threshold value T2 is selected.

As described above, also by the sensor selection using the threshold value, for example, in the case of FIG. 4, the histogram of B has a large area (and maximum value) in the range of the pixel value of the intermediate portion. Therefore, it is possible to select the imaging sensor 41b that has generated the B histogram.

It is also possible to compare a plurality of histograms and select the sensor having the largest area or the maximum value or the maximum value in the region of the intermediate pixel value without obtaining the above threshold value. .

A control signal for controlling the X-ray imaging time is generated using the imaging sensor 41 selected by any of the above methods (step 5 in FIG. 1), and this control signal is used to generate the X-ray. Fluoroscopy or X-ray imaging is performed (step 6 in FIG. 1).

That is, the sensor signal control unit 42, which has received the selection determination result from the sensor selection determination unit 23, switches and controls the sensor signal switching unit 43 according to the selection determination result.
Therefore, of the detection results of the imaging sensors 41a to 41c, the detection result that has passed through the sensor signal switching unit 43 switched according to the selection result is supplied to the integrator 44.

The integrator 44 integrates the detection results to obtain an average value for a fixed time. This integration result and the reference signal from the reference signal generator 45 are compared by the comparator 46,
The comparison result is used as an AEC control signal for exposure control. Then, the X-ray intensity generated by the high-voltage generator 53 is adjusted by the control of the imaging controller 52.

The reference signal generated by the reference signal generator 45 may be selected by the operator according to the body thickness or the like, and may be generated by selecting the most suitable signal from a plurality of reference values. is there.

As described in detail above, an X-ray fluoroscopic imaging method and apparatus capable of selecting an imaging sensor suitable for X-ray imaging time control can be realized by referring to a fluoroscopic image.

By the way, since the sensor selection determining unit 23 obtains the average value of the pixel values of the fluoroscopic image corresponding to the photographing sensor 41 selected as described above, the sensor selection determining unit 23 determines the average value of the pixel values of the perspective image. It is possible to determine the fluoroscopic condition by using the average value of the pixel values of the fluoroscopic image (the average pixel value of the fluoroscopic sensor area).

That is, the perspective control unit 51 refers to the average value of pixel values in the perspective image corresponding to the selected sensor,
The X-ray tube voltage and current as fluoroscopic conditions are determined. Then, according to the fluoroscopic conditions thus determined, the high-voltage generator 53 generates a high voltage for fluoroscopy, and the X-ray tube 6 irradiates X-rays. By doing so, the fluoroscopic condition is determined from the fluoroscopic image on the position of the imaging sensor, and the conditions of the sensor area for performing the control are matched between the fluoroscopic ABC control and the imaging AEC control. Will be possible. Therefore, there is no significant difference in exposure between the image obtained by fluoroscopy and the image obtained by photographing.

It is also possible to superimpose and display the position of the photographing sensor selected as described above on the fluoroscopic image. In this case, the photographing sensors 41a to 41c are previously prepared.
The sensitive area data is stored and stored in the sensor position information holding unit 31.

Then, the sensor position information control unit 32, which has received the selection decision result from the sensor selection decision unit 23, reads out the necessary sensor position information from the sensor position information holding unit 31 according to the selection decision result.

Further, the sensor position information control unit 32 develops the read sensor position information on the frame memory 33 as brightness information on the image data. As the brightness information generated and developed in this case, a mask that brightens a portion corresponding to the sensitive area of the selected and selected sensor and darkens the entire other area can be considered. For example, if the image data on the image memory 12 has 256 gradations, a value of −32 is written in the entire area of −32 at the selected position of the imaging sensor 41c (range surrounded by a solid line). The mask (sensor position mask data) based on the captured image data is stored in the frame memory 3
Generate on 3. In this case, the data of +32 is written in the range of the sensor which is not selected as in the area where the sensor does not exist.

This sensor position mask data (see FIG. 8)
(A)) and the image data from the image memory 12 (FIG. 8 (b)) are digitally added for each pixel by the adder 13, and the added digital data is DAC.
The analog video signal is restored at 14 and the image is displayed on the display unit 15. As a result, as shown in FIG. 8C, an image in which the area of the sensor which is selectively determined and used for the ABC control is brightened by the above-described mask is obtained. In the example of the mask described above, since the image is displayed with 64 gradations brighter than the surrounding area at the selected and determined position of the imaging sensor 41c, the range can be clearly represented.

The contents of this mask are not limited to the above-mentioned examples, and various changes can be made so that the position of the selected sensor becomes clear. For example, the lightness and darkness can be reversed or the lightness and darkness values can be changed. Also, it is possible to perform a blinking display depending on the brightness and a display using a frame.

This makes it clear to the operator during fluoroscopy which photographic sensor is used and exposure control is performed during photographic. The following modes are conceivable as a display mode for superimposing and displaying such a shooting sensor position. Only when the operator has selected the image sensor position display for image capturing, the image sensor position is superimposed and displayed. When the selection determination of the imaging sensor is switched manually or automatically, the sensor position is displayed in a superimposed manner for a predetermined time from the switching timing. Whether to display or not to display is selected, and the state is retained. In the above-mentioned items 1 to 3, when the operation of stopping the display is performed, the display is stopped.

By superimposing and displaying the sensor position used as described above on the fluoroscopic image, A
It can be expected that the operator can easily confirm and select the sensor at the same position as the EC control in the EC control, and the number of exposure failures in shooting can be reduced.

FIG. 7 is a flow chart showing the procedure of sensor position calibration processing stored in advance in the sensor position information holding unit 31. The calibration process will be described with reference to this flowchart.

First, one of the plurality of photographing sensors is selected to start the process (step 1 in FIG. 7). Then, the sensor shape is selected (step 2 in FIG. 7). For example, the shape of the sensor to be written as the sensor position information is displayed in a pattern of a predetermined color, and the shape of the sensor included in the result actually captured on the display screen of the display device 15 matches the shape of the sensor. Select the sensor shape.

Next, the sensor size is selected (step 3 in FIG. 7). For example, the size of the sensor to be written as the sensor position information is displayed in a pattern of a predetermined color in accordance with the shape determined in the above process, and is included in the result of actual imaging on the display screen of the display device 15. Select the sensor size to match the sensor size.

Then, the sensor position is selected (step 4 in FIG. 7). For example, the position of the sensor to be written as the sensor position information is displayed in a pattern of a predetermined color according to the shape and size determined in the above processing, and the result of actual imaging on the display screen of the display device 15 is displayed. Select the position of the sensor to match the position of the included sensor.

In this way, the shape, size, and position are adjusted for all the sensors (steps 5 and 6 in FIG. 7).
2, 3, 4), information on the shape, size, and position obtained for all the sensors is stored in a predetermined area of the sensor position information holding unit 31. As described above, the position information holding unit 3
The memory content of 1 is determined and stored.

By the way, in the brightness adjustment during fluoroscopy, the detection signal from the fluoroscopic sensor 9b or the average value of the pixel values of the fluoroscopic image at the position corresponding to the photographing sensor 41 selected as described above. With reference to this, the fluoroscopic control unit 51 controls the fluoroscopic condition according to the instruction from the main control unit 22.

In addition to such control of the fluoroscopic condition, the average value of the pixel values of the fluoroscopic image at the position corresponding to the selected imaging sensor 41 (the imaging sensor area pixel average value) and the fluoroscopic sensor 9b are supported. The main controller 22 generates a correction value with reference to the average value of the pixel values of the fluoroscopic image at the position (the average value of the fluoroscopic sensor area pixels), and the detection signal at the fluoroscopic sensor 9b is corrected using this correction value. It is possible to

By performing such processing (calculation of the average value and generation of the correction value) in the main control unit 22, the result of the corrected detection signal is transmitted to the fluoroscopic control unit 51. And
The fluoroscopic control unit 51 refers to the result of the corrected detection signal to determine the X-ray tube voltage and current as fluoroscopic conditions. Then, according to the fluoroscopic conditions thus determined, the high-voltage generator 53 generates a high voltage for fluoroscopy, and the X-ray tube 6 irradiates X-rays. In this way, the fluoroscopy is performed. Therefore, the main control unit 22 constitutes an average value calculating means and a correction signal generating means.

When such fluoroscopy is executed, the fluoroscopic condition is determined after correcting the actual detection signal of the fluoroscopic sensor 9b with the fluoroscopic image on the position of the photographing sensor and the fluoroscopic sensor. AE of shooting the state of ABC control of
It is possible to approach the state of C control. Therefore, a large difference in exposure does not occur between an image obtained by fluoroscopy and an image obtained by photographing.

When such a correction signal is used, the ratio between the correction signal and the detection result of the fluoroscopic sensor can be adjusted to any ratio in view of the above characteristics.

When the detection result of the fluoroscopic sensor 9b is used as described above, the driving mechanism is used instead of the fixed position (for example, the screen center) as described in the conventional example. It is also possible to make it movable. In this case, the fluoroscopic sensor 9b can be moved to the position of the selected imaging sensor 41. This also makes it possible to bring the control of the fluoroscopic condition and the control of the imaging condition close to each other.

Further, when controlling the photographing conditions, in addition to the control of the photographing conditions based on the detection result of the selected photographing sensor 41 as in the above-described embodiment, the photographing sensor 41 is detected with a correction value. It is possible to correct the result.

For example, the main controller 22 refers to the above-mentioned representative value representing the pixel value of the irradiation field portion and the average value of the pixel values of the fluoroscopic image at the position corresponding to the fluoroscopic sensor 9b, and the main controller 22 corrects the correction value. , And the fluoroscopic sensor 9b with this correction value.
It is possible to correct the detection signal at.

By performing such processing in the main controller 22, the result of the corrected detection signal is transmitted to the photographing controller 52. Then, the imaging control unit 52 refers to the result of the corrected detection signal to determine the X-ray tube voltage or current as the imaging condition. Then, the high voltage generator 53 generates a high voltage for shooting according to the shooting conditions thus determined, and X
The ray tube 6 irradiates X-rays. Shooting is performed in this manner.

When the photographing conditions are determined with such correction, the representative value obtained in advance is referred to
Even if the detection result of the imaging sensor 41 suddenly fluctuates greatly for some reason, the imaging conditions will not change significantly. Therefore, there is an advantage that the control system is stable. Further, by referring to the fluoroscopic image pixel value on the position of the fluoroscopic sensor, it becomes possible to bring the state of the AEC control of the photographing close to the state of the ABC control of the fluoroscopy.
Therefore, there is no significant difference in exposure between the image obtained by photographing and the image obtained by fluoroscopy.

When such a correction signal is used, the ratio between the correction signal and the detection result of the photographing sensor, and the ratio between the representative value included in the correction signal and the pixel value on the fluoroscopic sensor position Can be adjusted to any ratio in view of the above characteristics.

[0097]

As described above in detail with the embodiments, according to the inventions described in this specification, the following effects can be obtained.

The average value of the fluoroscopic pixel values and the histogram are generated in the area of the X-ray fluoroscopic image corresponding to the imaging sensor, and the non-irradiation field portion, the direct irradiation field portion and the irradiation field portion of the subject are recognized from the histogram. Then, a representative value representing the pixel value of the irradiation field portion of the subject is generated, the average value is compared with the representative value, and the detection signal of the sensor selected based on the comparison result is used to control the X-ray imaging time. According to the first invention, which is characterized by generating a control signal for performing X-ray fluoroscopy or X-ray imaging based on this control signal, radiography suitable for X-ray imaging time control by referring to the fluoroscopic image. An X-ray fluoroscopic imaging method capable of selecting a sensor for use is realized.

Further, the average value of the fluoroscopic pixel values and the histogram are generated in the area of the X-ray fluoroscopic image corresponding to the imaging sensor, and the non-irradiation field portion, the direct irradiation field portion, and the irradiation field portion of the subject are calculated from the histogram. Is recognized to generate a representative value representing the pixel value of the irradiation field portion of the subject, the average value is compared with the representative value, and the detection signal of the sensor selected based on the comparison result is used to determine the X-ray imaging time. According to the second aspect of the present invention, which is characterized in that a control signal for control is generated and X-ray fluoroscopy or X-ray imaging is performed by this control signal. It is possible to realize an X-ray fluoroscopic imaging apparatus capable of selecting a different imaging sensor.

Further, in the case of selecting the photographing sensor in the above-mentioned second invention, the difference between the average value and the representative value for the areas of the plurality of sensors is obtained, and the difference is set as a preset threshold value. According to the third aspect of the present invention, the sensor that gives the average value closest to the representative value is selected from the sensors whose difference is less than or equal to the threshold value, and the imaging suitable for the X-ray imaging time control is performed. It becomes possible to select a sensor for use.

Further, in the case of selecting the photographing sensor in the above-mentioned second invention, the difference between the average value and the representative value for the areas of the plurality of sensors is calculated, and the difference is set as a preset threshold value. Select the sensor that gives the average value that is the closest to the representative value from the sensors whose difference is less than or equal to the threshold value, and if there is no sensor whose difference is less than or equal to the threshold value, add and combine the average values. According to the fourth aspect of the invention, a sensor having an average value that is closest to the representative value of the plurality of sensors is selected so that the value is within a threshold value. Even when the value exceeds the value, it becomes possible to select the imaging sensor suitable for the X-ray imaging time control.

Further, at least one of the plurality of photographing sensors is used.
One of the two is selected, a control signal for controlling X-ray imaging time is generated based on the detection signal of the selected imaging sensor, and at least one of fluoroscopy or X-ray imaging is performed using the control signal. According to the fifth aspect of the invention, a perspective condition control signal for determining a perspective condition is generated from an average value of pixel values of regions on the perspective image corresponding to the selected one or more sensors. By determining the fluoroscopic condition from the fluoroscopic image on the position of the imaging sensor, it is possible to realize the X-ray fluoroscopic imaging apparatus capable of matching the fluoroscopic condition and the radiographic condition.

In addition, at least one of the plurality of photographing sensors is used.
When performing at least one of X-ray fluoroscopy and X-ray imaging by controlling the X-ray imaging time by using the detection signal or the combined detection signal of the selected imaging sensor, According to the sixth aspect of the invention, a region on the perspective image corresponding to the sensitive region is stored in advance, and the region of the selected imaging sensor is displayed so as to be superimposed on the perspective image. By superimposing and displaying the position of the imaging sensor selected for determining the imaging conditions, the relationship between imaging and fluoroscopy can be grasped.

Further, at least one of the imaging sensors is selected, and the X-ray imaging time is controlled by using the detection signal of the selected one imaging sensor or the combined detection signal. When one is performed, the imaging sensor area pixel average value obtained by averaging the pixel values of the areas on the fluoroscopic image corresponding to the selected one or more imaging sensors, and the fluoroscopy corresponding to the fluoroscopic sensor A fluoroscopic sensor area pixel average value obtained by averaging the pixel values of the area on the image is obtained, and a detection signal of the imaging sensor is obtained from the imaging sensor area pixel average value and the fluoroscopic sensor area pixel average value. A perspective condition control signal for determining the perspective condition is generated from the detection signal of the fluoroscope sensor and the correction signal, and the fluoroscopic condition control signal is used to perform the fluoroscopic observation. According to the seventh invention, which comprises carrying out, will be fluoroscopic condition is corrected by the detection signal of the imaging sensor, it is possible to maintain the consistency regarding exposure control with fluoroscopy and imaging.

Further, X is detected by using the detection signal of the photographing sensor.
When at least one of X-ray fluoroscopy and X-ray radiography is performed by controlling the radiography time, the non-irradiation field portion, the direct irradiation field portion, and the subject are examined from the entire fluoroscopic image or the histogram of the divided areas. A fluoroscopic sensor obtained by recognizing the irradiation field portion, generating a representative value representing the pixel value of the irradiation field portion of the subject, and averaging the pixel values of the area on the fluoroscopic image corresponding to the fluoroscopic sensor. An area pixel average value is obtained, and a correction signal for correcting the detection signal of the imaging sensor is generated from the representative value and the fluoroscopic sensor area pixel average value, and the correction signal is generated from the detection signal of the imaging sensor and the correction signal. According to the eighth invention, which is characterized in that a photographing condition control signal is generated and photographing is performed using this photographing condition control signal, the photographing condition is corrected by the detection signal of the fluoroscopic sensor, and And shooting It is possible to maintain the consistency regarding exposure control.

Further, in the above-described invention in which correction is performed using the fluoroscopic sensor, the fluoroscopic sensor is made movable so that the data at the optimum position can be obtained by matching the position of the imaging sensor. Become.

[Brief description of drawings]

FIG. 1 is a flowchart showing a basic processing procedure of an X-ray fluoroscopic imaging method of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of an X-ray fluoroscopic imaging apparatus which is an apparatus used in the X-ray fluoroscopic imaging method of the present invention.

FIG. 3 is a configuration diagram showing an example of the overall configuration of an X-ray fluoroscopic imaging apparatus used in the X-ray fluoroscopic imaging method of the present invention.

FIG. 4 is an explanatory diagram showing a state of determining an imaging sensor in the X-ray fluoroscopic imaging method of the present invention.

FIG. 5 is a flowchart showing another example of the processing procedure of the X-ray fluoroscopic imaging method of the present invention.

FIG. 6 is an explanatory diagram showing a state of superimposed display of an imaging sensor region selected and determined in the X-ray fluoroscopic imaging method of the present invention.

FIG. 7 is a flowchart showing a state of calibration processing of a sensor area to be displayed in the fluoroscopic imaging method of the present invention.

FIG. 8 is an explanatory diagram showing states of a CRT display screen, a II perspective region, and an ABC sensor region.

FIG. 9 is an explanatory diagram showing a state of a chest imaging apparatus.

[Explanation of symbols]

 6 X-ray tube 9a Television camera 9b Fluoroscopic sensor 11 ADC 12 Image memory 13 Addition unit 14 DAC 15 Display unit 21 Operation unit 22 Main control unit 23 Sensor selection determination unit 31 Sensor position information holding unit 32 Sensor position information control unit 33 frame Memories 41a to 41c Imaging sensor 42 Sensor signal control unit 43 Sensor signal switching unit 44 Integrator 45 Reference signal generation unit 46 Comparison unit 51 Fluoroscopy control unit 52 Imaging control unit 53 High voltage generation unit

Claims (9)

[Claims] 1. A plurality of imaging sensors are provided for exposure control during X-ray imaging, at least one of the imaging sensors is selected, and X is detected based on a detection signal of the selected imaging sensor. In an X-ray fluoroscopic imaging method for performing at least one of X-ray fluoroscopy or X-ray imaging by controlling the radiographic imaging time, an average of fluoroscopic pixel values for each region of the X-ray fluoroscopic images corresponding to the plurality of imaging sensors. Generating a value and a histogram, recognizing the non-irradiation field portion, the direct irradiation field portion and the irradiation field portion of the subject from the histogram to generate a representative value representing the pixel value of the irradiation field portion of the subject, By comparing the average value with the representative value, at least one imaging sensor used for X-ray imaging is selected, and the X-ray imaging time is controlled by using the detection signal of the selected imaging sensor. X-ray fluoroscopy method characterized by performing at least one of the line fluoroscopy or X-ray imaging. 2. A plurality of imaging sensors for exposure control during X-ray imaging are provided, at least one of the imaging sensors is selected, and X is detected based on a detection signal of the selected imaging sensor. In an X-ray fluoroscopic imaging device that performs at least one of X-ray fluoroscopy or X-ray imaging by controlling the radiographic imaging time, an average of fluoroscopic pixel values for each region of the X-ray fluoroscopic images corresponding to the plurality of imaging sensors. An average value / histogram generating means for generating a value and a histogram, and an object by recognizing a non-irradiation field portion, a direct irradiation field portion and an irradiation field portion of the object from the histogram generated by the average value / histogram generating means. Representative value generating means for generating a representative value representative of the pixel value of the irradiation field portion, and the average value generated by the average value / histogram generating means and the representative value generating means. And a sensor selection unit that selects at least one imaging sensor to be used for X-ray imaging by comparing the detected representative value with the detected representative value or the combined detection signal of the sensors selected by the sensor selection unit. X-ray imaging time control is performed to generate a control signal, and at least one of X-ray fluoroscopy and X-ray imaging is performed using this control signal.
Fluoroscopy equipment. 3. A difference between each average value obtained by the average value / histogram generating means for each of a plurality of sensor areas and a representative value generated by the representative value generating means is calculated, and the difference is set in advance. 3. A sensor selecting unit is provided for selecting a sensor that gives an average value closest to a representative value from sensors whose difference is equal to or less than the threshold value, as compared with the threshold value. The described X-ray fluoroscopic imaging apparatus. 4. A difference between each average value obtained by the average value / histogram generating means for each of the areas of the plurality of sensors and the representative value generated by the representative value generating means, and this difference is set in advance. If there is a sensor whose difference is less than or equal to the threshold value, the sensor that gives the average value closest to the representative value is selected, and the difference is less than or equal to the threshold value. When there is no such sensor, a sensor selecting means for selecting from a sensor having an average value closest to the representative value of the plurality of sensors so that the added synthetic value of the average values is within a threshold value is provided. The X-ray fluoroscopic imaging apparatus according to claim 2. 5. A plurality of imaging sensors for exposure control during X-ray imaging are provided, at least one of the imaging sensors is selected, and X is detected based on a detection signal of the selected imaging sensor. In an X-ray fluoroscopic imaging device that performs at least one of X-ray fluoroscopy or X-ray imaging by controlling the radiographic imaging time, an average of fluoroscopic pixel values for each region of the X-ray fluoroscopic images corresponding to the plurality of imaging sensors. A mean value generating means for generating a value, and a fluoroscopic condition determination for generating a fluoroscopic condition control signal for determining a fluoroscopic condition from an average value of pixel values of regions on the fluoroscopic image corresponding to the selected one or a plurality of sensors An X-ray fluoroscopic imaging apparatus comprising: a means for performing fluoroscopy using the fluoroscopic condition control signal. 6. A plurality of photographing sensors for exposure control during X-ray photographing are provided, at least one of the plural photographing sensors is selected, and X is detected based on a detection signal of the selected photographing sensor. In an X-ray fluoroscopic imaging apparatus that performs at least one of X-ray fluoroscopy or X-ray imaging by controlling a radiographic imaging time, areas on the fluoroscopic image corresponding to respective sensitive areas of the sensor are stored in advance, An X-ray fluoroscopic imaging apparatus comprising a display control unit capable of displaying one or a plurality of areas thereof on a fluoroscopic image in a superimposed manner. 7. A plurality of radiographic sensors for controlling the X-ray fluoroscopic condition and a plurality of radiographic sensors for exposure control during X-ray imaging, and a plurality of radiographic sensors for exposure control of the X-ray imaging. In the X-ray fluoroscopic imaging apparatus that performs at least one of X-ray fluoroscopy and X-ray imaging by selecting at least one of the above, and controlling the X-ray imaging time based on the detection signal of the selected imaging sensor, Image sensor area pixel average value obtained by averaging the pixel values of the area on the fluoroscopic image corresponding to the one or more radiographic sensors, and the pixel value of the area on the fluoroscopic image corresponding to the fluoroscopic sensor An average value calculating means for obtaining a fluoroscopic sensor area pixel average value obtained by averaging, and a detection signal of the fluoroscopic sensor from the imaging sensor area pixel average value and the fluoroscopic sensor area pixel average value. Correct Correction condition generating means for generating a correction signal, and a fluoroscopic condition signal generating means for generating a fluoroscopic condition control signal for determining a fluoroscopic condition from the detection signal of the fluoroscopic sensor and the correction signal. An X-ray fluoroscopic imaging apparatus characterized by performing fluoroscopy using a control signal. 8. An X-ray imaging time is provided using a fluoroscopic sensor for controlling X-ray fluoroscopic conditions and an imaging sensor for exposure control at the time of X-ray imaging. In an X-ray fluoroscopic imaging apparatus that performs at least one of X-ray fluoroscopy and X-ray imaging by controlling, a non-irradiation field portion, a direct irradiation field portion, and an object Representative value generation means for recognizing the irradiation field part and generating a representative value representative of the pixel values of the irradiation field part of the subject, and the pixel value of the region on the fluoroscopic image corresponding to the fluoroscopic sensor are obtained by averaging. A pixel average value calculating means for obtaining the fluoroscopic sensor area pixel average value, and a representative value generated by the representative value generating means and the fluoroscopic sensor area pixel average value calculated by the pixel average value calculating means. From the above A correction signal generation unit that generates a correction signal for correcting the detection signal of the shadow sensor, and a shooting condition control signal generation unit that generates a shooting condition control signal from the detection signal of the shooting sensor and the correction signal. An X-ray fluoroscopic imaging apparatus comprising: an imaging condition control signal for performing imaging. 9. The X-ray fluoroscopic apparatus according to claim 6, wherein the fluoroscopic sensor is configured to be movable.