JP2005020548A - X-ray diagnostic instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray diagnostic instrument for adjusting alignment in a short time without nonuniformity by worker. <P>SOLUTION: The instrument includes a converting means for converting an X-ray radiated from an X-ray tube and transmitted through a subject into an optical image; a means for forming an X-ray fluoroscopic image from the optical image via an optical system; a display means for displaying the X-ray fluoroscopic image on a monitor; a reference region designating means for displaying a reference point indicating the center position of the monitor, a reference circle having a fixed radius with the reference point as a center, and a marker indicating a position for obtaining the maximum luminance in the optical image; a peripheral edge information detecting means for detecting the position where the luminance of the optical image becomes the maximum value; and a comparison arithmetic means for calculating a deviation amount between the reference point and the position with the maximum luminance, and displaying the result in the display means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-ray diagnostic apparatus, and more particularly to an X-ray diagnostic apparatus considering alignment adjustment when the X-ray diagnostic apparatus is installed at a position where the X-ray diagnostic apparatus is used.
[0002]
[Prior art]
As an X-ray diagnostic apparatus, for example, an apparatus is known in which X-rays are exposed to a patient and an X-ray fluoroscopic image obtained from the transmitted X-rays is displayed on a TV monitor for diagnosis. Such an X-ray diagnostic apparatus can observe the movement of a catheter inside a subject, the flow of a contrast medium, and the like through a monitor, and is used for various diagnoses.
[0003]
An X-ray fluoroscopic image is obtained by converting X-rays transmitted through a patient into an optical image with an image intensifier (hereinafter referred to as “II”), and converting the optical image into an image signal with a TV camera. . As this TV camera, a solid-state imaging device such as a CCD is widely used.
[0004]
An example of such an X-ray diagnostic apparatus is shown in FIG. As shown in FIG. 12, the X-rays exposed from the X-ray tube 2 are exposed toward the patient H while being narrowed by the X-ray diaphragm 3. X-rays transmitted through patient H I. 4 and the optical system 5 convert it into an optical image, and the optical image is photoelectrically converted by a light receiving element such as a two-dimensionally arranged photodiode formed on the imaging surface of the TV camera 6.
[0005]
This optical system 5 has an I.D. I. 4 is composed of a lens (hereinafter referred to as “II lens”) 12 placed behind 4, a lens (hereinafter referred to as TV lens) 16 installed in front of the TV camera 6, etc. The image is adjusted to be appropriate on the imaging surface of the camera 6 and imaged on the same surface.
[0006]
I. I. The lens 12 and the TV lens 16 are formed by fixing one or a plurality of optical lenses to a focus ring (not shown), and the focus ring is attached so as to be movable forward and backward in the axial direction of the lens barrel 14.
[0007]
Thus, I.I. I. The lens 12 corresponds to an objective lens, the TV lens 16 corresponds to an eyepiece lens, and two lenses form a pair.
[0008]
In addition, depending on the model, depending on the purpose, iris or I. I. A prism or a mirror may be installed between the lens 12 and the iris.
[0009]
The electric charge accumulated in the light receiving element, that is, the pixel by this photoelectric conversion is transferred at high speed based on a control signal φ from a CCU (Camera Control Unit) 11 and then amplified by an amplifier and output as an image signal. This image signal is converted into a digital image signal by the A / D converter 7 and then subjected to various image processing as required by an image processing circuit 8 having an image memory, for example.
[0010]
The output signal from the image processing circuit 8 is converted to an analog image signal by the D / A converter 9 and is displayed on the TV monitor 10.
[0011]
By the way, when the X-ray diagnostic apparatus is newly adopted and carried into a place where it is actually used, as shown in FIG. 13 (a), a) X-ray tube 2-I. I. 4) b. I. 4-I. I. It is necessary to adjust the alignment between the lens 12 and c) between the TV lens 16 and the TV camera 6.
[0012]
At this time, if all the alignments are adjusted, for example, as shown in FIG. 13A, the center O of the TV monitor 10, the center A of the image, and the point B at which the luminance is maximum coincide. However, if the X-ray tube 2 is deviated, as shown in FIG. I. When 4 is shifted, the center A of the image deviates from the center O of the TV monitor 10 as shown in FIG. If the alignment adjustment of the TV camera 6 has not been completed, the maximum luminance point B and the center A of the image appear to deviate from the center A of the TV monitor 10 as shown in FIG.
[0013]
Also, since the optical lens etc. are screwed to the main body of the device, even if it is not a new case, the screw will be loose and the center of the image and the center of the optical lens will not be uniquely determined, etc. There is. Therefore, this alignment adjustment is also required for repair or replacement.
[0014]
These adjustment methods at present will be described with reference to FIGS. At this time, first, I.I. I. 4 and I.V. I. Alignment adjustment with the lens 12 is performed.
[0015]
I. I. 4 and I.V. I. As shown in FIG. I. A cylindrical collimator 21 is installed behind the lens 12 to emit X-rays from the X-ray tube 2. I. An operator who installs the X-ray diagnostic apparatus looks into the visible light converted by the step 4. This is why you need to do it first. At this time, the worker may be exposed to X-rays. As shown in FIG. 14B, a reference circle G that is concentric with the collimator 21 is engraved on the collimator 21. I. 4 so as to be concentric with the edge N of the image output from I.4. I. 4 center and I.V. I. In order to align with the center of the lens 12, I.V. I. The lens 12 and the collimator 21 are moved up, down, left and right as a set, and alignment adjustment is performed.
[0016]
This collimator 21 is currently of a type in which X-rays are reflected by a mirror 22 or a prism and viewed from a position bent 90 degrees as shown by the broken line in FIG. Things are becoming mainstream.
[0017]
Thus, I.I. I. 4 and I.V. I. When the alignment adjustment with the lens 12 is completed, devices from the TV lens 16 to the TV monitor 10 are connected. The X-ray tube 2 and the I.V. I. Move on to alignment adjustment with 4.
[0018]
In this case, I.I. I. 4-I. I. Similar to the alignment adjustment between the lenses 12, X-rays are emitted from the X-ray tube 2, and the X-rays are emitted from the I.D. I. 4 to convert to visible light. And I.I. I. Adjustment is performed while an image formed via the lens 12, the TV lens 16, the TV camera 6, and the like is viewed on the TV monitor 10.
[0019]
In this way, the X-ray tube 2 and the I.V. I. In the case where there is no obstacle between 4 and 4, the luminance is maximized at a position (point P1 shown in FIG. 13B) that is directly in front of the X-ray tube 2. Therefore, the point P1 where the luminance is maximum is I.I. I. 4 or the X-ray tube 2 or I.4 so as to coincide with the center point P2. I. 4 is moved to adjust the alignment.
[0020]
Subsequently, alignment adjustment between the TV lens 16 and the TV camera 6 is performed. FIG. 15A illustrates the alignment adjustment between the TV lens 16 and the TV camera 6. Also in this case, X-rays are emitted from the X-ray tube 2 and the X-rays are emitted from the I.V. I. 4 to visible light. I. Adjustment is performed by viewing on the TV monitor 10 an image formed via the lens 12, the TV lens 16, the TV camera 6, and the like.
[0021]
On the TV monitor 10, as shown in FIG. 15B, a reference circle H centered on the center O of the TV monitor 10 is displayed. I. The TV camera 6 is moved up, down, left, and right so that the edge L of the image output from 4 and the TV lens 16 passes through is concentric, that is, the center of the TV lens 16 coincides with the center of the TV camera 6. To adjust the alignment.
[0022]
These X-ray tubes 2-I. I. 4 and the alignment adjustment between the TV lens 16 and the TV camera 6 are performed in accordance with I.D. I. 4-I. I. Unlike the case between the lenses 12, the adjustment can be made while viewing the image displayed on the TV monitor 10, so that the X-ray is not directly confronted. However, I.I. I. 4 and the TV camera 6 are moved in accordance with I.D. I. Since it is performed by the operator's hand as in the case of the alignment adjustment of the lens 12, the operator is still placed in an X-ray exposure environment.
[0023]
Even if one of these adjustments can be adjusted to some extent, an error occurs again when the other part is adjusted, and the adjustment must be made again, that is, they have a mutual influence relationship. Therefore, it is necessary to make an overall adjustment with feedback.
[0024]
In addition, adjustment of the X-ray diaphragm 3 is also necessary as adjustment performed when the apparatus is installed. The X-ray diaphragm 3 is disposed in front of the X-ray window of the X-ray tube 2 and is configured by combining a plurality of diaphragm blades (lead plates) 41, 42, 43, 44 as shown in FIG. The irradiation field is promoted by reducing the irradiation field to the minimum necessary. These diaphragm blades 41, 42, 43, and 44 are individually provided with two systems of servo motors (not shown) via a rack and pinion mechanism or the like, and the diaphragm blades 41 provided on an operation panel (not shown) by the operator. When the operation buttons corresponding to, 42, 43, 44 are appropriately operated, the diaphragm blades 41, 42, 43, 44 are moved by a distance corresponding to the operation amount in the direction corresponding to the operation button. Thereby, the operator can change the opening part between the aperture blades 41, 42, 43, 44 to an arbitrary size.
[0025]
In this X-ray diaphragm 3, as shown in FIG. 16A, the vertical and horizontal axes of the diaphragm blades 41, 42, 43, 44 are shifted from the vertical or horizontal direction of the TV camera 6 (torsion of the diaphragm blades). As indicated by a and b in FIG. 16B, the opening / closing center of the aperture blades 41, 42, 43, 44 may be displaced from the center O of the TV monitor 10.
[0026]
For example, as shown in FIG. 16 (a), when the aperture blades 41, 42, 43, 44 are twisted, if the aperture of the aperture blades 41, 42, 43, 44 is small, the end portion is missing and the image is taken. There is. If the aperture of the diaphragm blade is increased to cope with this, X-rays may be irradiated more than necessary. In order to eliminate such a problem, the X-ray diaphragm 3 also needs to be adjusted. Conventionally, this adjustment is performed sensibly by an operator turning the diaphragm blades or moving the diaphragm blades up, down, left and right while viewing the image of the diaphragm blades displayed on the monitor.
[0027]
All of these adjustments, including the adjustment of the X-ray aperture, are centered by the operator according to the reference (for example, the reference circle displayed on the TV monitor in the case of TV camera-TV lens adjustment). Since this is an operation, the adjustment accuracy varies depending on the experience and skill of the operator. However, even if it is attempted to provide an allowable value for the adjustment amount in order to suppress this variation and ensure a certain level of accuracy, it is difficult with the conventional X-ray diagnostic apparatus.
[0028]
Furthermore, the movement of the parts during adjustment is performed by the operator while appropriately shifting the parts by the reference amount, and thus requires a long work time. However, in the installation adjustment of the X-ray diagnostic apparatus, the worker Since it is placed in an X-ray environment, it must work while wearing protective clothing to reduce exposure, which is a significant physical burden for the operator. Also, even if the amount of X-rays exposed to workers during a single adjustment is small, there is a demand for workers who install a lot of equipment to do as little as possible because they have health risks. is there.
[0029]
Therefore, there is a need for a method that can perform such adjustment of alignment and the like in a short time as much as possible without causing variations among operators. As an attempt to solve such a problem, an optical image is received by a large CCD imaging device, an effective image range is set, and the effective image range is moved in the vertical and horizontal directions so that the optical image falls within the effective image range. What is adjusted is proposed (for example, refer patent document 1). However, this proposal requires an unnecessarily large CCD image sensor and relates only to the TV camera position. I. The lens 12 has not been studied. In other words, the current situation is that these problems are not sufficiently studied.
[0030]
[Patent Document 1]
JP-A-9-331483 (page 4, left column, line 36 to right column, line 3, FIG. 3)
[0031]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide an X-ray diagnostic apparatus that can perform alignment adjustment so that there is no variation among workers.
[0032]
Another object of the present invention is to provide an X-ray diagnostic apparatus capable of adjusting alignment in a short time to reduce the X-ray exposure dose.
[0033]
[Means for Solving the Problems]
In order to solve the above-described problem, an X-ray diagnostic apparatus according to the present invention converts X-rays exposed from an X-ray tube and transmitted through a subject into an optical image as described in claim 1. An X-ray diagnostic apparatus comprising: means; means for forming an X-ray fluoroscopic image from the optical image via an optical system; and display means for displaying the X-ray fluoroscopic image on a monitor. A reference area designating unit for displaying a reference circle, a margin of the optical image is detected, a margin information detecting unit for displaying on the display unit, and a deviation amount between the reference circle and the outline of the margin is calculated. And a comparison operation means for displaying the result on the display means.
[0034]
Next, in order to solve the above-described problem, the comparison calculation unit according to claim 2 is configured to calculate a distance between a point on the reference circumference and a point on the contour corresponding to the point at a plurality of points. The amount of deviation is calculated.
[0035]
In order to solve the above-described problem, the comparison calculation means according to claim 3 sets a plurality of regions adjacent to the reference circle and including a part of the contour, and determines the information amount in the plurality of regions. It is calculated as a deviation amount.
[0036]
In order to solve the above-described problem, the information amount according to claim 4 is the luminance in the region.
[0037]
Furthermore, in order to solve the above-described problem, the comparison calculation means according to claim 5 displays the amount of deviation between the reference circle and the contour and the direction of the deviation on the display means.
[0038]
Furthermore, in order to solve the above-described problem, an X-ray diagnostic apparatus according to claim 6 includes a conversion unit that converts X-rays exposed from the X-ray tube and transmitted through the subject into an optical image, and an optical system. In an X-ray diagnostic apparatus comprising a means for forming an X-ray fluoroscopic image from the optical image via a display and a display means for displaying the X-ray fluoroscopic image on a monitor, a reference point indicating the center position of the monitor; Reference area designating means for displaying a reference circle centered on the reference point and having a certain radius and a marker indicating a position where the brightness of the optical image is maximized, and a position where the brightness of the optical image is maximized are detected. Edge information detecting means, and a comparison operation means for calculating a deviation amount between the reference point and the position where the luminance is maximized and displaying the result on the display means.
[0039]
Furthermore, in order to solve the above-described problem, the comparison calculation means according to claim 7 is characterized in that at least one of a distance between the marker and the reference point and a determination result of whether or not the marker is inside the reference circle. Is calculated as the amount of deviation and displayed on the display means.
[0040]
In order to solve the above-described problem, an X-ray diagnostic apparatus according to an eighth aspect includes a conversion unit that converts X-rays that have been exposed from an X-ray tube and transmitted through a subject into an optical image, and the exposure. X-ray irradiation field adjusting means for adjusting the irradiated X-ray irradiation field by opening and closing the diaphragm blades, means for forming an X-ray fluoroscopic image from the optical image via an optical system, and this X-ray fluoroscopic image as a monitor In an X-ray diagnostic apparatus comprising a display means for displaying, horizontal and vertical reference lines indicating the center position of the monitor, and adjustment lines shown at a certain distance in the vertical and horizontal directions parallel to the reference line Between the reference area designating means for displaying on the display means, the edge information detecting means for detecting the edge position of the diaphragm blade of the X-ray irradiation field adjusting means, and the deviation between the adjustment line and the detected edge position. The amount is calculated and the result is displayed on the display means. Is intended and a comparison operation means that.
[0041]
Furthermore, in order to solve the above-described problem, the comparison calculation means according to claim 9 calculates a rotation angle between the adjustment line and the diaphragm blade as a shift amount and displays the calculated shift angle on the display means.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an X-ray diagnostic apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of an X-ray diagnostic apparatus 1 according to an embodiment of the present invention. In the X-ray diagnostic apparatus 1 of the present embodiment, the same components as those of the conventional X-ray diagnostic apparatus 101 shown in FIG.
[0043]
The X-ray diagnostic apparatus 1 according to the present embodiment includes a reference area designating unit 31, an edge information detecting unit 32, and a comparison calculating unit 33 in addition to the conventional one.
[0044]
The reference area designating unit 31 displays on the TV monitor 10 graphics such as circles and dots designated for alignment adjustment designated by an operator or the like via an operation panel (not shown). Information such as the position of the reference region and the pixel value set here is output to the comparison calculation unit 33.
[0045]
The edge information detection unit 32 calculates I.D. from pixel value and position information of each pixel of the image signal converted into digital information by the A / D converter 7. I. 4 detects the edge of the output window 4 and outputs the information to the comparison operation unit 33.
[0046]
The comparison calculation unit 33 compares the information about the reference area received from the reference area designating unit 31 with the information about the edge received from the edge information detection unit 32, and the distance or Calculate brightness etc.
[0047]
Next, an alignment adjustment procedure in the X-ray diagnostic apparatus 1 will be described.
[0048]
First, I.I. I. 4-I. I. The alignment of the lens 12 is adjusted with a collimator conventionally used, and the configuration from the optical system 5 to the TV monitor 10 is changed to I.D. I. Connect to 4. Thereafter, the X-ray tube 2 and the I.V. I. Alignment adjustment with 4 is performed.
[0049]
The operator moves the X-ray diagnostic apparatus 1 to an adjustment mode by operating an operation panel (not shown) and the like, and then a reference point O indicating the center position of the screen, and an allowable adjustment range centering on this O. And a marker M indicating a point with the maximum luminance are displayed on the TV monitor 10. The size of the reference circle C may be an arbitrary size, and usually only needs to be within the centering adjustment range. On the other hand, the marker M is an I.D. I. The position where the luminance of the 4-output image is maximized is displayed.
[0050]
The operator sets the marker M so that the marker M is in the reference circle C. I. 4, I.I. I. Adjustment is performed while moving the attachment positions of the lens 12 and the X-ray tube 2. Ideally, it is best to make the marker M and the reference point O coincide with each other, but it is extremely difficult to perform positioning while supporting a heavy object with a hand. If it is within the range, it will be allowed.
[0051]
Further, an error between the reference point O and the marker M is displayed as a numerical value on the TV monitor 10 so that the operator can determine whether the adjustment is successful or not, and whether the marker M is inside the reference circle C or not. You may enable it to display. FIG. 2 shows an example in which the distance between the reference point O and the marker M is displayed as a pixel value at the lower right of the TV monitor 10, and “OK” is displayed when the marker M is in the reference circle C. Yes.
[0052]
FIG. 3 is a flowchart showing the display procedure and information flow. The reference area specifying unit 31 first specifies the reference point O (step S1), and then requests the worker to specify the size of the reference circle C (step S2). When the size of the reference circle C is designated, these pieces of information are sent to the comparison calculation unit 33 (step S3). On the other hand, the edge information detection unit 32 detects a pixel having the maximum luminance from the image data (step S4), and acquires position information of the pixel (step S5). Then, the information is sent to the TV monitor 10 via the image processing circuit 8 to be displayed as the marker M and sent to the comparison calculation unit 33 (step S6).
[0053]
Receiving these pieces of information, the comparison calculation unit 33 (steps S7 and S8) compares the distance between the reference point O and the marker M to determine the distance (step S9). Then, the result is transmitted to the image processing circuit 8 (step S10), superimposed on the image captured by the TV camera 6, and displayed on the TV monitor 10.
[0054]
X-ray tube 2-I. I. Subsequent to the alignment adjustment between the four lenses, the alignment adjustment of the TV lens 16 and the TV camera 6 is performed. FIG. 4 is an example of an image on the TV monitor 10 in the alignment adjustment of the TV lens 16-TV camera 6 according to the present embodiment. FIG. 5 is a flowchart showing the display procedure and information flow.
[0055]
When performing this work, the worker operates an operation panel (not shown) to give an instruction to the reference area designating unit 31 and designates the center O of the screen on the TV monitor 10 (step S11). The reference circle D for adjustment centered on the point O is displayed (step S12). When the reference circle D is specified, these pieces of information are sent to the comparison calculation unit 33 (step S13).
[0056]
On the other hand, the edge information detection unit 32 has the I.D. I. 4 is detected (step S14), and the position information is acquired (step S15). Then, the information is displayed on the TV monitor 10 via the image processing circuit 8 and sent to the comparison calculation unit 33 (step S16). X-rays I. The portion that has passed through the output window 4 has high brightness, and the other portions are dark. Therefore, this I.D. I. The edge N of the output image 4 is obtained by detecting a position where a pixel having high luminance and a pixel having low luminance are adjacent to each other. This I.I. I. 4 is the TV lens 16 or I.4. I. It may be the edge of the lens barrel image of the lens 12.
[0057]
The reference circle D set by the reference area designating unit 31 and the I.D. I. Information on the contour of the edge N of the output image 4 is sent to the comparison calculation unit 33 (steps S17 and S18). The comparison calculation unit 33 calculates the amount of deviation from both pieces of information (steps S19 to S22).
[0058]
In this example, the reference circle D and I.I. I. The distance from the edge N of the output image 4 is displayed numerically. Two points are set on the reference circle D in the vertical direction and two points in the horizontal direction (step S19), and the position of the intersection of the extension of the straight line connecting the center of the reference circle and these four points and the outline of the edge N is set. Obtained (step S20). Then, the distance between the points on the reference circle D and the corresponding points on the outline of the edge N is calculated (step S21), and the result is transmitted to the image processing circuit 8. (Step S22).
[0059]
The operator I. The TV camera 6 is moved while viewing the amount of deviation displayed on the TV monitor 10 so that the contour N of the output image 4 and the reference circle D are concentric. This shift amount is displayed by the number of pixels on the TV monitor 10. I. 4 It may be converted into an actual distance at an arbitrary point such as an input surface or an output surface and displayed. Further, by comparing these numerical values, it is possible to display the direction to be moved with arrows as shown in FIG. While watching the TV monitor, the operator moves the TV camera 6 so that the vertical and horizontal values are all equal, and aligns the alignment.
[0060]
FIG. 6 shows a modification of this display. Instead of the distance, a plurality of reference regions R are set in the vicinity of the reference circle D, and the moving direction is displayed according to the average pixel value. is there. In FIG. I. 4 shows an example in which a plurality of reference regions R having the same size including the contour of the edge N of the output image 4 are installed in the vertical and horizontal directions.
[0061]
As mentioned above, X-rays are I. The portion that has passed through the output window 4 has high brightness, and the other portions are dark. Therefore, this I.D. I. In the part where the contour of the edge N of the output image 4 is away from the reference circle D, the high luminance part in the reference region R is wide and the pixel value is also high. Conversely, I.I. I. 4, the pixel value in the reference region R also decreases at a location where the contour of the edge N of the output image 4 is close to the reference circle D. Therefore, the operator moves the TV camera 6 and adjusts the alignment so that all the displayed pixel values are equal.
[0062]
FIG. 7 shows another modification of the moving direction and moving amount display. In FIG. 7, only the arrows indicating the movement amount and direction are displayed.
[0063]
Similar to the above two cases, the shift amount and the direction are calculated in the comparison operation unit 33 based on the information of the reference area designating unit 31 and the edge information detection unit 32. However, the four points on the reference circle D and the region of interest R, which are in the middle of the process, are not displayed, and the amount of movement and the direction of movement of these points are combined and displayed as a vector. Thus, the operator can recognize the adjustment amount and direction at a glance, and adjust the alignment by moving the TV camera so that the deviation amount becomes zero.
[0064]
Subsequently, a modification of the present embodiment will be described with reference to FIG. In the above-described embodiment, the X-ray tube 2-I. I. 4 and the adjustment between the TV lens 16 and the TV camera 6 are performed separately. According to this method, each adjustment can be performed in a shorter time than the conventional method. But the need for feedback remains. On the other hand, this modification can perform these simultaneously.
[0065]
That is, FIG. 8 shows the X-ray tube 2-I. I. A reference point O indicating the center position of the screen for alignment adjustment between the four, a reference circle C indicating the allowable range of adjustment centered on O, and a marker M indicating the point having the maximum luminance are displayed. A reference circle D for adjustment centering on the center O of the screen for adjusting the alignment between the TV lens 16 and the TV camera 6; I. 4 is displayed on the TV monitor 10 at the same time.
[0066]
Thereby, if the other shifts during adjustment, the operator can immediately recognize it, and both adjustments can be related to each other, so that the adjustment time can be further shortened.
[0067]
Finally, an embodiment of a method for adjusting the X-ray diaphragm 3 will be described below. A method of adjusting the rotation and objectivity of the left and right X-ray aperture blades 42 and 44 will be described with reference to the flowchart of the procedure and information flow shown in FIG.
[0068]
First, the reference area designating unit 31 sets the vertical reference line v and the horizontal reference line h indicating the image center position of the TV monitor 10 and the adjustment lines u and u serving as the reference for the adjustment position of the X-ray diaphragm 3 to the left and right of the reference line. (Step S31). Further, a reference circle F centered on the center O of the screen is also displayed (step S32). Then, these pieces of information are sent to the comparison calculation unit 33 (step S33).
[0069]
The edge information detection unit 32 detects the edge position Q of the X-ray diaphragm 3 from the luminance difference of the image (step S34), and acquires the position information (step S35). Then, the position information is sent to the comparison calculation unit 33 (step S36).
[0070]
The comparison calculation unit 33 that has received the information from the reference area designating unit 31 and the edge information detection unit 32 (steps S37 and S38) calculates the deviation between the edge position Q and the adjustment lines u and u (step S39). ), And transmits the calculation result to the image processing unit 8 (step S40). These pieces of information are superimposed on the X-ray image by the image processing unit 8 and displayed on the TV monitor 10.
[0071]
FIG. 10 shows an example of a screen on the TV monitor 10 at the time of adjusting the horizontal deviation between the adjustment lines u and u and the diaphragm blades 42 and 44, and the movement amount is indicated by a numerical value and the movement direction is indicated by an arrow. Has been. This deviation amount can be easily obtained from the coordinate values in the horizontal direction between the adjustment lines u and u and the edge position. Adjustment of the diaphragm blades 41 and 43 in the vertical direction is performed in the same manner as when adjusting the horizontal displacement of the diaphragm blades 42 and 44 by displaying the adjustment lines u and u in the horizontal direction.
[0072]
FIG. 11 is an example of adjusting the deviation in the rotational direction of the diaphragm blades 41, 42, 43, and 44, and is an example in which the twist is shown by the rotational angle. This angle is calculated from the coordinates of the intersections of the upper and lower two positions of the line indicating the edge position and the reference circle F. In addition to this, the shift amount may be displayed by the number of pixels in the horizontal and vertical directions. Thereby, the operator can see the deviation | shift amount of an adjustment line and an X-ray aperture blade as a numerical value, and can perform adjustment objectively.
[0073]
The embodiments described above are for illustrative purposes and do not limit the scope of the invention. Accordingly, those skilled in the art can employ embodiments in which each or all of these elements are replaced by equivalents thereof, and these embodiments are also included in the scope of the present invention.
[0074]
【The invention's effect】
As described above, according to the X-ray diagnostic apparatus of the present invention, it is possible to adjust the alignment so that there is no variation among workers.
[0075]
In addition, the present invention can achieve an effect of reducing the X-ray exposure dose as a result of alignment adjustment in a short time.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of an X-ray diagnostic apparatus according to an embodiment of the present invention.
FIG. 2 X-ray tube-I. I. The figure explaining the alignment adjustment between lenses.
FIG. 3 X-ray tube-I. I. The flowchart which shows the procedure in the alignment adjustment between lenses, and the flow of information.
FIG. 4 is a diagram for explaining alignment adjustment between a TV camera and a TV lens.
FIG. 5 is a flowchart showing a procedure and information flow in alignment adjustment between a TV camera and a TV lens.
FIG. 6 is a view showing a modification example of a shift amount display in alignment adjustment between a TV camera and a TV lens.
FIG. 7 is a diagram showing a second modified example of a shift amount display in alignment adjustment between a TV camera and a TV lens.
FIG. 8 is a diagram showing a third modified example of a shift amount display in alignment adjustment between a TV camera and a TV lens.
FIG. 9 is a flowchart showing a procedure and information flow in adjusting the X-ray diaphragm.
FIG. 10 is a diagram for explaining left-right shift adjustment of an X-ray diaphragm.
FIG. 11 is a view for explaining twist adjustment for an X-ray aperture TV camera.
FIG. 12 is a block diagram showing a schematic configuration of a conventional X-ray imaging apparatus.
13 is a diagram showing an example of the relationship between alignment adjustment and TV monitor display in the X-ray diagnostic apparatus, where (a) is adjusted, (b) is an X-ray tube, (c) is I.D. I. The optical system, (d) is a diagram when the TV camera is shifted.
FIG. 14 shows a conventional X-ray tube-I. I. It is a figure explaining the alignment adjustment between lenses, (a) is the method, (b) is the figure which shows the display screen.
15A and 15B are diagrams for explaining alignment adjustment between a conventional TV camera and a TV lens, in which FIG. 15A shows the method and FIG. 15B shows the display screen.
16A and 16B are diagrams for explaining adjustment of a conventional X-ray diaphragm, in which FIG. 16A is a twist with respect to a TV monitor, and FIG. 16B is a diagram showing a shift in the left-right direction.
[Explanation of symbols]
1,101 X-ray diagnostic equipment
2 X-ray tube
3 X-ray aperture
4 I. I.
5 Optical system
6 TV camera
7 A / D converter
8 Image processing circuit
9 D / A converter
10 TV monitor
11 CCU
12 I.E. I. lens
14 Lens barrel
16 TV lens
21 Collimator
22 Mirror
31 Reference area designating part
32 Edge information detection unit
33 Comparison operation part
41, 42, 43, 44
C, D, F Reference circle
M marker
N Edge of output image
O Screen center
R reference area
Q Edge position
h, v reference line
u Adjustment line

Claims (9)

Conversion means for converting X-rays exposed from the X-ray tube and transmitted through the subject into an optical image, means for forming an X-ray fluoroscopic image from the optical image via an optical system, and the X-ray fluoroscopic image In an X-ray diagnostic apparatus comprising display means for displaying on a monitor,
Reference area designating means for displaying a reference circle in the center of the display means;
Edge information detection means for detecting the edge of the optical image and displaying the edge on the display means;
A comparison calculation means for calculating a deviation amount between the reference circle and the outline of the edge and displaying the result on the display means;
An X-ray diagnostic apparatus comprising: 2. The comparison calculating means calculates a distance between a point on the reference circumference and a point on the contour corresponding to the point as a deviation amount at a plurality of points. X-ray diagnostic equipment. 2. The comparison calculation unit according to claim 1, wherein a plurality of areas adjacent to the reference circle and including a part of the contour are set, and an information amount in the plurality of areas is calculated as a deviation amount. X-ray diagnostic equipment. The X-ray diagnostic apparatus according to claim 3, wherein the information amount is a luminance in the region. The X-ray diagnosis according to any one of claims 2 to 4, wherein the comparison calculation means causes the display means to display a deviation amount between the reference circle and the contour and a direction of the deviation. apparatus. Conversion means for converting X-rays exposed from the X-ray tube and transmitted through the subject into an optical image, means for forming an X-ray fluoroscopic image from the optical image via an optical system, and the X-ray fluoroscopic image In an X-ray diagnostic apparatus comprising display means for displaying on a monitor,
A reference area designating means for displaying a reference point indicating the center position of the monitor, a reference circle centered on the reference point and having a constant radius, and a marker indicating a position where the brightness of the optical image is maximized;
Edge information detecting means for detecting a position where the luminance of the optical image is maximized;
A comparison calculation means for calculating a deviation amount between the reference point and the position where the luminance is maximum, and displaying the result on the display means;
An X-ray diagnostic apparatus comprising: The comparison calculation means calculates at least one of a distance between the marker and the reference point and a determination result as to whether or not the marker is inside the reference circle as a deviation amount, and causes the display means to display it. The X-ray diagnostic apparatus according to claim 6. A conversion means for converting X-rays exposed from the X-ray tube and transmitted through the subject into an optical image; and an X-ray irradiation field adjustment means for adjusting the irradiation field of the exposed X-rays by opening and closing aperture blades; In the X-ray diagnostic apparatus comprising: means for forming an X-ray fluoroscopic image from the optical image via an optical system; and display means for displaying the X-ray fluoroscopic image on a monitor.
A reference area specifying means for displaying on the display means a horizontal and vertical reference line indicating the center position of the monitor and an adjustment line shown at a certain distance in the vertical and horizontal directions in parallel with the reference line;
Edge information detecting means for detecting an edge position of the diaphragm blade of the X-ray irradiation field adjusting means;
A calculation means for calculating a deviation amount between the adjustment line and the detected edge position, and displaying the result on the display means;
An X-ray diagnostic apparatus comprising: 9. The X-ray diagnosis apparatus according to claim 8, wherein the comparison calculation unit calculates a rotation angle between the adjustment line and the diaphragm blade as a shift amount and displays the calculated shift amount on the display unit.

Images