JP3419652B2 - X-ray diagnostic equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray diagnostic apparatus suitable for use in a biplane inspection apparatus or the like composed of frontal and lateral X-ray diagnostic apparatuses used for angiographic examination, and particularly to each X-ray diagnostic apparatus. The present invention relates to an X-ray diagnostic apparatus for improving operability by providing an operating means such as a joystick capable of operating the diagnostic apparatus at hand.

[0002]

2. Description of the Related Art Conventionally, in a cardiac catheter examination, since it is necessary to spatially follow complicated blood vessel travel, fluoroscopic imaging is generally performed by a biplane examination apparatus.

This biplane inspection apparatus is a floor-standing type X
A C-arm holding device (F: frontal holding device) that is a line diagnostic device and an Ω arm holding device (L: lateral holding device) that is a stationary (ceiling-hung) X-ray diagnostic device are both used at the same time, By "irradiating" a small amount of X-rays continuously from each holding device to obtain X-ray moving images, fluoroscopic images in two directions are simultaneously obtained.

FIG. 9 shows a schematic view of a biplane operation of a conventional angiographic examination, and FIG. 10 shows perspective images of a frontal holding device and a lateral holding device obtained by this biplane operation.

The positioning of this angiographic examination is performed by setting the C-arm 101 of the frontal holding device (F) to RAO 30.
°, the Ω arm 100 of the lateral holding device (L) is LAO
This is the case when set to 60 °.

Although the required field of view for cardiac catheterization is 9 inches, an image intensifier () is required because a high-quality X-ray image capable of visually recognizing narrowing of a blood vessel or the tip of a thin catheter is required. The field-of-view switching function of I.I.) enables close-contact fluoroscopy in a 6-inch magnification mode.

Further, in a cardioangiography examination using such a frontal holding device (F) and a lateral holding device (L), it is not possible to fit the whole cardiovascular within a 6-inch visual field, so that the subject is supine. The two holding devices of the table top plate 102, the frontal (F) 101, and the lateral (L) 100 are operated to follow the flow of the contrast agent. Although FIG. 10 shows both the 9-inch visual field and the 6-inch visual field, the fluoroscopic image actually displayed on the monitor is the fluoroscopic image of the 6-inch visual field.

The operation procedure of following the flow of the contrast medium in the fluoroscopic field is to control the slide of the table top plate 102 lying on the subject in the direction of arrow A (right direction) in FIG. ) The Ω arm 100 is indicated by an arrow B in the figure.
The movement is controlled in the direction (upward). As a result, as shown in FIG. 10, the perspective image of the frontal holding device (F) is displayed with the image in the center of the screen shifted leftward, and the perspective image of the lateral holding device (L) is displayed in the image in the center of the screen. Will be displayed to the right.

Next, the table top plate 102 is moved to the arrow C in FIG.
Slide control in the direction (head direction). As a result,
As shown in FIG. 0, as a perspective image of the frontal holding device (F), the distal end portion of the blood vessel outside the visual field is displayed by the slide movement control of the table top plate 102, and as a perspective image of the lateral holding device (L), The blood vessel end region that has been out of the visual field is displayed.

This operation is performed while observing each fluoroscopic image (DSA image) displayed on the monitor in real time.
It is designed to follow the contrast medium flowing through the cardiovascular system.

[0011]

However, in such a cardioangiography examination, two holding devices, that is, the table top plate, the frontal holding device, and the lateral holding device, which are laid on the back of the subject, are operated to cause the flow of the contrast medium. Have to follow.
This operation is extremely complicated and requires skill, and since it is difficult for a single operator to operate the frontal holding device and the lateral holding device in two directions in combination, it is conventionally
There has been a problem that a dedicated operator (two operators in total) is required to operate the frontal holding device and the lateral holding device.

The present invention has been made in view of the above-mentioned problems, and the operability is improved so that even one operator can sufficiently perform the operation following the flow of the contrast agent. The purpose is to provide a line diagnostic device.

[0013]

In order to solve the above-mentioned problems, the present invention provides an X-ray generator for irradiating a subject with X-rays, and an X-ray for the subject from the X-ray generator. X-ray detection means for capturing an X-ray image formed by exposing a ray, and a detection area of the X-ray detection means are divided into a plurality of portions, and the pixel value of each divided area is detected and the X-ray detection is performed. Reading range movement control means for controlling movement of the reading range of the X-ray image from the means to the divided area where the detection result of the pixel value has reached a predetermined level, and X-rays of the reading range movement-controlled by the reading range movement control means. And a read-out control unit for controlling the read-out of the image from the X-ray detection unit.

Specifically, for example, in a cardiovascular examination, when a contrast medium is injected into a subject, the contrast medium gradually spreads over the heart blood vessel, and the pixel value changes accordingly. Therefore, the read range movement control means divides the detection area of the X-ray detection means into a plurality of areas and detects the pixel value of each divided area.
Then, when the pixel value of the divided area becomes equal to or smaller than a predetermined value (or equal to or larger than a predetermined value), it is determined that, for example, the contrast agent has flowed into the cardiovascular region located in the divided area, and the reading is performed in the divided area. Control the movement of the range.

Thus, the read range for reading the X-ray image can be automatically controlled so as to follow the movement of the region of interest. Therefore, even if the region of interest moves, the desired field of view can always be automatically observed.
It is possible to omit the operation of changing the positioning and controlling the movement of the table top that the subject lies on. Therefore,
The operability of the X-ray diagnostic apparatus can be further improved.

X-ray generating means for irradiating the subject with X-rays, and X for capturing an X-ray image formed by irradiating the subject with X-rays from the X-ray generating means. X-ray detection means, read range movement control means for moving and controlling the read range of the X-ray image from the X-ray detection means, display means for displaying the X-ray image of the read range of the X-ray detection means, and the display. Read range moving operation means for remotely operating the movement of the read range based on the image displayed on the means, wherein the read range movement control means displays the image displayed on the display means by the read range moving operation means. Based on the movement amount, the reading range is controlled to move in the opposite direction to the operated direction, and the display means reads the X-ray image of the reading range after the movement control read by the reading control means. Is characterized by displaying That.

Thus, the image corresponding to the direction in which the display is moved and operated can be displayed on the display means. Therefore, in general, the apparent direction of the X-ray image read out from the X-ray detection means on the display means and the direction in the actual read-out X-ray image are opposite to each other. It is possible to eliminate the discomfort that the region of interest in the direction of the operation is displayed when the user looks at the right side of the movement, and to further improve the operability of the X-ray diagnostic apparatus.

X-ray generating means for irradiating the subject with X-rays, and X for capturing an X-ray image formed by irradiating the subject with X-rays from the X-ray generating means. The line detection means, the read range movement control means for moving and controlling the read range of the X-ray image from the X-ray detection means, the storage means for storing the movement pattern of the read range for each inspection content, and the inspection content are designated. An inspection content setting unit, and the read range movement control unit moves and controls the read range based on a movement pattern stored in the storage unit corresponding to the inspection content designated by the inspection content setting unit. It is characterized by that.

Thus, the movement pattern of the read range is stored for each inspection content, and the read range is moved along the pattern, whereby the movement operation can be omitted and the inspection is automatically performed. It becomes possible to do it.

For example, since there is not much difference in the flow of the contrast medium among individuals, the movement pattern of the reading range for the cardioangiography examination is stored, and the examination content of cardioangiography can be designated at the time of the examination. Can be done automatically.

Since the desired field of view can always be automatically observed in this manner, the operability of the X-ray diagnostic apparatus can be further improved.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an X-ray diagnostic apparatus according to the present invention will be described in detail below with reference to the drawings.

First, the X-ray diagnostic apparatus according to the present invention can be applied to a biplane inspection apparatus mainly used for cardiovascular angiography as shown in FIG.

In FIG. 1, the biplane inspection apparatus according to the first embodiment is a floor-standing type X attached to a floor.
It has a frontal holding device 1 which is a line diagnostic device and a lateral holding device 2 which is a stationary X-ray diagnostic device which is attached to a ceiling or the like.

The frontal holding device 1 is provided with an X-ray generator 4 and a solid-state flat detector 5 as an X-ray detector, which are provided at opposite ends of a C-shaped C arm 3 so as to face each other. It has a moving mechanism 6 for controlling movement of the flat panel detector 5 to the X-ray generation section 4 side and the anti-X-ray generation section 4 side.

The lateral holding device 2 is provided with an X-ray generator 7 and an X-ray detector 8 which are opposite to each other at opposite ends of an Ω-shaped Ω arm 10 and a solid plane detector 8 which is an X-ray detector. It has a movement mechanism 9 for controlling movement of the flat panel detector 8 to the X-ray generation section 7 side and the anti-X-ray generation section 7 side.

As shown in FIG. 2, the solid-state flat panel detectors 5 and 8 provided in the respective holding devices 1 and 2 include a plurality of X-ray detecting elements each including a pixel 21 and a thin film transistor (TFT) 22 in a column direction and a row. The two-dimensional array is arranged in the direction.

Each pixel 21 converts a X-ray into visible light and forms a charge according to the amount of the visible light, and a capacitor (storage capacitor) for storing the charge formed by the photodiode. The TFT 22 operates as a switch for reading out the electric charge stored in the storage capacitor of each pixel 21.

The connection point between the cathode terminal of the photodiode and one terminal of the storage capacitor is the power supply line 25-.
1, 25-2 ... 25-n, reverse bias power supply (-
Vn), and the connection point between the anode terminal of the photodiode and the other terminal of the storage capacitor is the TFT 22.
Is connected to the source terminal of.

The gate terminal of the TFT 22 is commonly connected to each row by the read lines 23-1, 23-2, ... 23-n, and is connected to each line output terminal of the line driving section 24.

The drain terminal of each TFT 22 has a corresponding vertical transfer line 26-1, 26-2 ... 26-.
n is connected in common to each column, and each switch 28- of the multiplexer 28 is connected via the readout amplifier 27.
1, 28-2 ... 28-n.

The cross section of the X-ray detecting element composed of each pixel 21 and TFT 22 is as shown in FIG. 3, and the TFT region 36 (TFT) and the pixel region 37 on the support 35 are shown.
(PD) is provided.

SiN is formed on the support 35 in the PD region 37.
The x layer 42 is laminated. On this SiNx layer 42, a transparent electrode 50 connected to a source electrode 46 of a TFT region 36 described below is laminated, and on this transparent electrode 50, an n ⁺ a-Si layer 47 and an ia-Si layer are formed. 48, p
^{The +} a-Si layer 49 and the transparent electrode 50 are sequentially stacked to form a photodiode having a Pin structure.

Next, a gate electrode 41 is formed on the support 35 in the TFT region 36, and a SiNx layer 42 is laminated on the gate electrode 41. In addition, a− on the SiNx layer 42 on the TFT region 36.
A Si layer 43 is laminated, and a drain electrode 45 and a source electrode 46 are formed on the Si layer 43 with an n ⁺ a-Si layer 44 interposed therebetween. Further, on the drain electrode 45 and the source electrode 46, the TFT region 36 and the PD region 3 are formed.
The first polyimide resin layer 51 is laminated so as to divide 7 and the PD region 37 adjacent to the polyimide resin layer 51 is formed on the first polyimide resin layer 51.
A metal electrode 52 is provided so as to electrically connect the transparent electrodes 50 to each other.

A second polyimide resin layer 53 is laminated on the transparent electrode 50 and the metal electrode 52,
A transparent protective film 4 is formed on the second polyimide resin layer 53.
0, a phosphor 39, and a light reflection layer 38 are sequentially stacked.

Next, the biplane inspection apparatus follows a control section 11 for controlling the entire inspection apparatus, an operation section 12 operated when an operator specifies a desired operation, and a flow of a contrast agent. The solid-state flat panel detectors 5, which are moved by moving
It has a read area preset memory 13 in which the size of eight read areas is preset.

The operation unit 12 includes the solid-state flat panel detectors 5, 8
Field-of-view movement operation tool 14 provided with a frontal joystick 17 (F joystick) and a lateral joystick 18 for manually controlling the movement of the readout area, and for setting an operation mode of the movement control of the readout area. The operation mode setting key 15 and the reading area setting key 16 for presetting the reading areas of the solid-state flat panel detectors 5 and 8 are provided.

Next, the operation of the biplane inspection apparatus of the first embodiment having such a configuration will be described.

For example, when performing a cardioangiography examination using this biplane examination apparatus, the operator first gives a frontal view, which is a typical positioning of the examination, to a subject on a bed (not shown). The C arm of the holding measure 1 is set to RAO 30 °, and the lateral holding device 2 is used.
Set the Ω arm of LAO to 60 °.

Next, the operator operates the readout area setting key 16 of the operation section 12 to set the readout area size of each solid-state flat panel detector 5 or 8 to follow the flow of the contrast agent.

Specifically, the operator sets the read area setting key 1
If you operate 6 to specify this read area size setting,
The control unit 11 controls the display of a closed line such as a circle or a rectangle for designating an area on the monitor device. When the operator operates a mouse, a cross key, or the like up, down, left, or right, the control unit 11 moves and displays this closed line up, down, left, or right in accordance with the operation of the mouse or the like. Then, the operator turns on the enter key when the closed line displayed on the monitor reaches a desired size. When the enter key is turned on, the control unit 11 takes in the size of the read area set immediately before that.

As a result, the size of the read area can be expanded or contracted to the size desired by the operator.
As will be described later, the control unit 11 controls the solid-state flat panel detectors 5, 8 based on the size of the read-out area set in this way.
Read control is performed.

Here, in the biplane inspection apparatus,
As described above, the read area having a desired size can be set each time, and the size of the read area which is frequently used can be preset.

For example, if each of the solid-state flat panel detectors 5 and 8 has a total field of view of 9 inches, the read area setting key 16
Is provided with a read area selection key for designating a read area size such as 4 inches or 6 inches. The operator selects a read area selection key corresponding to a frequently used read area selection key from the read area selection keys and turns it on. As a result, the control unit 11 stores the read area size corresponding to the read area selection key that is turned on in the read area preset memory 13, and when performing the read control of the solid-state flat panel detectors 5 and 8 described later. The read control is performed with the preset read area size.

When the setting or designation of the read area size is completed in this way, the operator next operates the operation mode setting key 1
5 is operated to select the mode for controlling the movement of the read area.

As the operation modes which can be set by the operation mode setting key 15, there are provided a total of three modes, that is, first to third modes. The first mode is a mode in which the joysticks 17 and 18 of the field-of-view moving operation tool 14 are independently operated to independently move and control the readout areas of the solid-state flat panel detectors 5 and 8, and the second mode is A mode in which the read-out areas of the solid-state flat panel detectors 5 and 8 are interlocked and controlled by operating only the frontal joystick 17, and the third mode is the solid-state flat panel detector 5 operated by operating only the F joystick 17. The read area of the joystick 17 is controlled to move in the operating direction of
The reading area of the solid-state flat panel detector 8 is in a mode in which movement control is performed in a direction orthogonal to the operation direction of the joystick 17.

Next, when the operator sets a desired mode by using the operation mode setting key 15, the operator turns on a see-through designation key (not shown) to designate the start of see-through. When the control unit 11 detects the ON operation of the fluoroscopic designation key, the control unit 11 controls the X-ray generation units 4 and 7 of the holding devices 1 and 2 so as to irradiate the subject with a small amount of X-rays. .

Each solid-state flat panel detector 5 of each holding device 1, 2.
8 captures the X-ray image formed by this X-ray irradiation.

Specifically, the solid-state flat panel detectors 5 and 8 are
The light reflection layer 38 shown in FIG. 3 reflects visible light other than X-rays transmitted through the subject. As a result, only X-rays are incident on the phosphor 39 via the light reflection layer 38. The phosphor 39 is
The incident X-rays are converted into visible light, and this visible light is incident on a photodiode sensitive to visible light through the transparent protective film 40, the second polyimide resin layer 53 and the transparent electrode 50.

The photodiode forms electric charges according to the amount of visible light and supplies the electric charges to the above-mentioned storage capacitor.

The control section 11 controls the line drive section 24 of each solid-state flat panel detector 5 or 8 so that the read area size is stored in the read area setting key 16 or the read area preset memory 13 shown in FIG. And multiplexer 28
To control.

As a result, the solid-state flat panel detectors 5 and 8 are formed.
The electric charges accumulated in the respective storage capacitors are read out as image signals in pixel units for each line via the read lines 23-1, 23-2, ... 23-n, selected by the multiplexer 28, and output. It is supplied to the monitor device via the terminal 29.

Since the read image signal is proportional to the dose of X-rays, the X-ray images captured by the solid-state flat panel detectors 5 and 8 as shown in FIG. ，
2 can be displayed on each monitor device 55, 56.

Next, the operator uses the monitor devices 55 and 56.
The joysticks 17 and 18 are respectively operated so as to follow the flow of the contrast agent while confirming the flow condition of the contrast agent flowing through the cardiovascular displayed on the screen.

As described above, each joystick 17,
The operation mode by operating 18 is the operation mode setting key 1
5 is set from among the first to third modes. However, when the first mode is selected, the control unit 11 responds to each operation of each joystick 17, 18. When the second mode is selected, the read areas of the solid-state flat panel detectors 5 and 8 are independently controlled, and when the second mode is selected, only the frontal joystick 17 is operated to operate the solid-state flat panel detectors 5 and 8 respectively. When the third mode is selected, the read areas are controlled in association with each other, and when the third mode is selected, the read area of the solid-state flat panel detector 5 is moved in the operation direction of the joystick 17 by operating only the F joystick 17. At the same time, the reading area of the solid-state flat panel detector 8 is controlled to move in a direction orthogonal to the operation direction of the joystick 17.

Further, the control unit 11 controls the X-ray generation units 4 and 7 so that the X-rays are irradiated correspondingly to the movement control of the read area and the X-ray irradiation corresponding to the movement control read area. The X-ray diaphragm provided is controlled.

For example, when there is a correlation between the moving direction and the moving amount of each reading area of each holding device 1, 2, the operator:
Select the third mode.

When the third mode is selected, the control unit 11 controls the movement of the reading area of the solid-state flat panel detector 5 in accordance with the operating direction of the F joystick 17, and also operates the joystick 17. The reading area of the solid-state flat panel detector 8 is controlled to move in a direction orthogonal to the direction. Further, the control unit 11 controls the movement of each solid-state flat panel detector 5,
The X-ray diaphragms provided in the X-ray generators 4 and 7 are controlled so that the X-rays are emitted only to the read-out region 8.

As a result, the joystick 17 for F
The read-out regions of the solid-state flat panel detectors 5 and 8 can be moved and controlled by simply operating only the above, and as shown in FIG. 5, images of the holding devices 1 and 2 that follow the flow of the contrast agent can be obtained. You can In addition, it is possible to prevent the inconvenience that X-rays are exposed to unnecessary portions other than the reading area, and it is possible to reduce unnecessary exposure of the subject.

Here, the biplane inspection apparatus is provided with frontal and lateral joysticks 17 and 18 for controlling the movement of the read area. The joysticks 17 and 18 are operated. If the amount of movement of the read-out region that is controlled to be moved in the caudal-to-caudal direction is not the same for both holding devices 1 and 2, a shift will occur in each image (region of interest) on the monitor device.

Therefore, in this biplane inspection apparatus, the movement amount in the head-to-tail direction is shared, and the control unit 11
When one of the joysticks 17 and 18 is operated, moves the read area corresponding to the other joystick so that the movement amount becomes the same as the movement amount in the head-to-caudal direction corresponding to this operation.

As a result, each joystick 17, 1
It is possible to prevent the inconvenience that the images (regions of interest) displayed on the monitor are displaced due to the shift of the movement amount of the reading region in the head-to-tail direction by the operation of 8.

The images read from the solid-state flat panel detectors 5 and 8 displayed on the monitor are generally such that the left side of the ROI is on the right side of the display screen and the ROI is on the left side of the display screen. The right side of is displayed. Therefore, if the right side of the ROI is displayed on the monitor when the joysticks 17 and 18 are tilted to the right, the ROI in the direction opposite to the operation direction is displayed on the monitor, which causes a feeling of strangeness. .

For this reason, the control unit 11 controls the movement of the readout areas of the solid-state flat panel detectors 5 and 8 by controlling the movement of the readout areas in the direction opposite to the operation direction of the joysticks 17 and 18. I do.

As a result, the joysticks 17 and 18 are
An image corresponding to the operation direction of can be displayed on the monitor.

As is apparent from the above description, the first
In the biplane inspection apparatus according to the embodiment of the present invention, the solid-state flat panel detectors 5, 5 are
The read-out area 8 is controlled to move and follow the flow of the contrast agent to perform imaging.

Therefore, the joysticks 17 and 18 can be operated without operating the holding devices 1 and 2 and the bed table.
The cardioangiography examination can be performed only by the operation. Therefore, even in a biplane examination such as a cardioangiography examination, it is possible for one operator to sufficiently perform the operation following the flow of the contrast agent, and it is possible to reliably obtain the best X-ray image without failure.

Further, since the fluoroscopic imaging position of the subject is changed by changing the read-out range of the solid-state flat panel detector, the C arm 3, the Ω arm 10 and the subject are changed when the fluoroscopic imaging position is changed. It is possible to reduce the movement of the top plate to be placed. Since the movements of the C arm 3, the Ω arm 10, and the top plate on which the subject is placed can be reduced when changing the fluoroscopic imaging position, the number of accidents such as collisions during the movement of the arm and the top plate can be reduced. You can

Next, a biplane inspection apparatus according to the second embodiment of the present invention will be described.

In the biplane inspection apparatus according to the first embodiment described above, the operator looks at the images of the solid-state flat panel detectors 5 and 8 displayed on the monitor while looking at the joysticks 17 and 1 respectively.
8 is operated to control the movement of the read area. However, the biplane inspection apparatus according to the second embodiment is
By controlling the movement of the readout area on a predetermined trajectory,
This is a complete omission of the moving operation.

That is, the positioning of the holding devices 1 and 2 is usually determined according to the examination contents, and the flow of the contrast medium does not vary so much between individuals. For this reason,
The biplane inspection apparatus according to the second embodiment is shown in FIG.
As shown in FIG. 5, a movement pattern memory 57 for storing movement patterns of the reading area for each inspection content is provided.

Along with this, the operation unit 12 is provided with an inspection content setting unit 56 for setting the inspection content, and injection information (injection information) of the contrast agent from the injector 55 for injecting the contrast agent into the subject is provided. It is configured to be taken in by the control unit 11.

Since the other structure is similar to that of the biplane inspection apparatus according to the first embodiment described above, FIG.
Among them, the same reference numerals are given to the portions showing the same operation, and the duplicated explanation will be avoided.

In the biplane inspection apparatus according to the second embodiment, the operator uses the inspection content setting unit 56 to specify the inspection content. The inspection content setting unit 56 is provided with a plurality of selection keys for designating these, for example, corresponding to each inspection, and the operator turns on a desired selection key from these.

When the control section 11 detects the ON operation of the selection key, the control section 11 corresponds to the ON-operated selection key.
The movement pattern program in the read area is read from the movement pattern memory 57. Injection information indicating the injection status of the contrast agent is supplied to the control unit 11 from the injector 55.

The control unit 11 detects the flow condition of the contrast agent according to the injection information, and controls the movement of each reading area of each solid-state flat panel detector 5, 8 based on the movement pattern program.

As a result, it is possible to automatically control the movement of each readout area in accordance with the flow of the contrast agent simply by operating the examination content setting section 56 and selecting the examination content. The same effects as those of the biplane inspection device according to the embodiment can be obtained.

For a special examination, a technique similar to the bolus chasing performed in the lower limb contrast blood vessel examination may be used.

Next, a biplane inspection apparatus according to the third embodiment of the present invention will be described.

The biplane inspection apparatus according to the second embodiment described above controls the movement of each read area along a preprogrammed trajectory according to the set inspection contents. The biplane inspection apparatus according to the embodiment of the present invention captures image information from the solid-state flat panel detectors 5 and 8 in real time, and controls the movement of the readout area according to the change of the pixel value of the image. .

That is, the biplane inspection apparatus according to the third embodiment detects a change in the pixel value of each image information from each solid-state flat panel detector 5, 8 as shown in FIG. 7, and outputs this detection output. Is provided to the control unit 11.

Since the other structure is the same as that of the biplane inspection apparatus of the first embodiment described above, FIG.
Among them, the same reference numerals are given to the portions showing the same operation, and the duplicated explanation will be avoided.

In the biplane inspection apparatus according to the third embodiment as described above, the control unit 11 equally divides the entire image area of each solid-state flat panel detector 5, 8 into, for example, four divided areas, that is, upper, lower, left, and right. The image of the divided area is read out, for example, every predetermined time and supplied to the read area pixel value detection unit 60.

The read area pixel value detection unit 60 integrates the pixel value for each image of each divided area supplied at every predetermined time, and when the pixel value becomes equal to or higher than a predetermined level (or equal to or lower than a predetermined level). Then, it is determined that the contrast agent has flowed into the blood vessel located in the divided area, and the read area is moved to the divided area.

Specifically, when the contrast agent flows along the blood vessel, the pixel value of the image of the divided area gradually increases the white level. Therefore, when the pixel values are integrated, the total pixel value of the image in which the contrast agent has begun to flow into the blood vessel gradually becomes a low value. Therefore, the control unit 11 controls the movement of the read area so as to follow the area having the low pixel value.

As a result, as shown in FIG. 8, it is possible to automatically control the movement of the readout area so as to follow the flow of the contrast medium, which is similar to the biplane inspection apparatus of the first embodiment described above. The effect can be obtained.

In the description of the third embodiment,
Although the entire area of each solid-state flat panel detector 5, 8 is divided into four, this may be a desired number of divisions such as 9 divisions or 16 divisions. By increasing the number of divisions, the tracking accuracy in the traveling direction of the blood vessel is improved. Further, when the blood vessel traveling direction is limited, it may be divided into two.

In each of the above embodiments, each X
The movement control of the readout area may be performed based on the position information of the X-ray diaphragm of the line generation units 4 and 7.

Further, the display image of the read area may be displayed as it is without being enlarged, or may be enlarged and displayed. When enlarging and displaying, it is desirable that the pixel densities of the solid-state flat panel detectors 5 and 8 be formed in advance so that a required resolution can be obtained.

Finally, an example in which the X-ray diagnostic apparatus according to the present invention is applied to a biplane inspection apparatus has been described. In addition to the above, the present invention is applied to, for example, a single plane inspection apparatus. It goes without saying that various modifications can be made according to the design and the like as long as they do not deviate from the technical idea of the present invention.

[0091]

According to the present invention, even in a biplane examination such as a cardioangiography examination, one operator can sufficiently perform the operation following the flow of the contrast agent, and the operation in the examination is simplified. It is possible to obtain the best X-ray image without fail.

[Brief description of drawings]

FIG. 1 is a block diagram of a biplane inspection apparatus according to a first embodiment to which an X-ray diagnostic apparatus according to the present invention is applied.

FIG. 2 is a block diagram of a solid-state flat panel detector provided as an X-ray detector in the lateral holding device and the frontal holding device of the biplane inspection apparatus.

FIG. 3 is a partial sectional view of the solid-state flat panel detector.

FIG. 4 is a diagram showing a monitor device on which a perspective image picked up by the lateral holding device and the frontal holding device is respectively displayed.

FIG. 5 is a diagram showing a state in which each perspective field of the lateral holding device and the frontal holding device is displayed following a flow of a contrast agent in a cardiovascular examination.

FIG. 6 is a block diagram of a biplane inspection apparatus according to a second embodiment to which an X-ray diagnostic apparatus according to the present invention is applied.

FIG. 7 is a block diagram of a biplane inspection apparatus according to a third embodiment to which an X-ray diagnostic apparatus according to the present invention is applied.

FIG. 8 is a view showing an operation of the biplane inspection apparatus according to the third embodiment, in which the fluoroscopic visual field is automatically controlled to follow the flow of the contrast agent by controlling movement of the fluoroscopic visual field according to the pixel value of the fluoroscopic image. It is a figure for explaining.

FIG. 9 is a view for explaining the biplane operation of the conventional lateral holding device and frontal holding device in the cardioangiography examination.

FIG. 10 is a diagram showing a perspective image obtained by a conventional biplane operation.

[Explanation of symbols]

1 ... Frontal holding device, 2 ... Lateral holding device, 3 ...
C-arm 4, 7 ... X-ray generator, 5, 8 ... Solid-state flat panel detector, 6, 9
... moving mechanism 10 ... Ω arm, 11 ... control unit, 13 ... read-out area preset memory 12 ... operation unit, 14 ... visual field moving operation tool, 15 ... operation mode setting key 16 ... read-out area setting key 17, 17 ... frontal joystick 18 ... Lateral joystick, 55 ... Injector 56 ... Inspection content setting section, 57 ... Movement pattern memory 60 ... Readout area pixel value detection section

Claims (9)

(57) [Claims] 1. An X-ray generation unit for irradiating an examinee with X-rays, and an X-ray for capturing an X-ray image formed by irradiating the subject with X-rays from the X-ray generation unit. The detection area of the X-ray detection means and the detection area of the X-ray detection means are divided into a plurality of areas, and the pixel value of each divided area is detected. A read range movement control means for controlling movement to a divided area having a predetermined level, and a read control means for controlling read-out of the X-ray image of the read range movement-controlled by the read range movement control means from the X-ray detection means. An X-ray diagnostic apparatus, comprising: 2. A read range after movement control according to an X-ray diaphragm provided in the X-ray generation means for controlling an X-ray exposure range and a read range movement control by the read range movement control means. The X-ray diagnostic apparatus according to claim 1, further comprising: an X-ray diaphragm control unit that controls the X-ray diaphragm so that X-rays that have passed through the subject are detected. 3. An X-ray diaphragm provided in the X-ray generation means, and a display means for displaying an X-ray image read by the X-ray detection means, wherein the display means is the X-ray diaphragm. The X-ray diagnostic apparatus according to claim 1, wherein the X-ray image in the readout range can be enlarged and displayed according to the aperture control of the above. 4. X-ray generation means for irradiating a subject with X-rays, and X for capturing an X-ray image formed by irradiating the subject with X-rays from the X-ray generation means. Line detection means, read range movement control means for moving and controlling the read range of the X-ray image from the X-ray detection means, storage means for storing a movement pattern of the read range according to inspection contents, and designation of inspection contents An inspection content setting unit, and the read range movement control unit moves and controls the read range based on a movement pattern stored in the storage unit corresponding to the inspection content designated by the inspection content setting unit. An X-ray diagnostic apparatus characterized in that 5. The X-ray generation means includes frontal X-ray generation means and lateral X-ray generation means, and the X-ray generation means
The line detecting means includes frontal X-ray detecting means and lateral X-ray detecting means.
The X-ray diagnostic apparatus according to claim 4. 6. A mode in which the read ranges of the frontal X-ray detection means and the lateral X-ray detection means are independently controlled to move, and the frontal X-ray detection means and the lateral X-rays. The reading range movement control means is provided with a selection means capable of selecting any of the modes for moving the reading range of the detection means in conjunction with each other, and the reading range movement control means controls the movement of the reading range based on the mode selected by the selection means. The X-ray diagnostic apparatus according to claim 5, wherein: 7. The X for the frontal is selected by the selecting means.
When a mode is selected in which movement control is performed by interlocking the read ranges of the line detection means and the lateral X-ray detection means, the read range movement control means determines the front X-ray detection means and the lateral X-ray detection means. The movement control of the reading range of the other X-ray detecting means is performed so that the movement amount of the reading range of one of the X-ray detecting means becomes the same in the head-to-tail direction. The X-ray diagnostic apparatus according to item 6. 8. The X-ray diagnostic apparatus according to claim 1, further comprising setting means for setting a size of the reading range. 9. The X-ray diagnostic apparatus according to claim 1, wherein the X-ray detecting means is a solid-state flat panel detector formed by arranging a plurality of solid-state detecting elements.