JP2000000233A - X-ray photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray photographing device capable of easily and quickly performing photographing from many directions. SOLUTION: Respective memory switches 30a-30i are disposed at positions on an additional operation panel 30 related to a turning direction and a turning angle in the plane view of an examinee body M. The memory switch 30a is disposed at the position showing CRAN and LAO directions, the memory switch 30b is disposed at the position for indicating only the CRAN direction and the memory switch 30c is disposed at the position for indicating the CRAN and RAO directions. Further, the memory switch 30d is disposed at the position showing only the LAO direction, the memory switch 30e is disposed at the position showing that the turning angle is 0 deg. in any turning directions and the memory switch 30f is disposed at the position showing only the RAO direction. Similarly, the respective memory switches 30g-30i are disposed at the positions respectively showing CAUD and LAO directions, only the CAUD direction and CAUD and RAO directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray tube and an X-ray detector which are opposed to each other and are rotated around and around the body axis of a subject to obtain X-rays from multiple directions. The present invention relates to an X-ray imaging apparatus that performs radiography.

[0002]

2. Description of the Related Art As a conventional X-ray imaging apparatus of this type, for example, a C-shaped arm for supporting an X-ray tube and an X-ray image intensifier facing each other, and a C-shaped arm around a subject lying on a bed And a position detector for detecting actual rotation information of the rotation direction (the body axis direction of the subject and around the body axis) and the rotation angle, and the desired rotation direction of the C-arm. And an input unit for inputting target rotation information of the rotation angle and the rotation angle, and controlling the rotation of the C-shaped arm so that the input target rotation information matches the actual rotation information from the position detection unit. There is an X-ray imaging apparatus including a rotation control unit.

An input section for inputting target rotation information includes a rotation direction key for instructing a rotation direction, an angle setting key for setting a rotation angle, and a plurality of keys set by these. A plurality of memory switches for storing target rotation information and a storage execution key for storing the target rotation information in the memory switch are provided. Note that the plurality of memory switches are configured so that one of the plurality of memory switches is selected by sequentially switching numerical values in an up-down manner, or by directly specifying a numerical value with a numeric key.

[0004] In the X-ray imaging apparatus configured as described above, for example, the rotating directions of the C-shaped arm in multiple directions are expressed as follows. In a state where the C-arm is rotated about the body axis of the subject (around the body axis), the direction of rotation to the left as viewed from the head side of the subject is “LAO” (left forward tilt). )
On the contrary, the turning direction to the right is expressed as “RAO” (right forward tilt). In the state where the subject is rotated along the body axis (the body axis direction), the direction of rotation of the subject toward the head is expressed as “CRAN” (CRANIAL), and conversely, the foot side. The direction of rotation to is represented as “CAUD” (CAUDAL).

[0005] In this X-ray imaging apparatus, target rotation information is stored in advance before imaging as follows. First, a rotation direction (LAO, RAO, CRAN, CAUD) is specified by a rotation direction key, and a rotation angle is specified by an angle setting key.
Then, by designating the number of the memory switch and pressing the storage execution key, the target rotation information including the rotation direction and the rotation angle is stored in the memory switch of the specified number. Next, the same operation is performed by sequentially changing the number of the memory switch, and a plurality of target rotation information is set in the memory switch.

At the time of photographing, the photographer specifies the number of the memory switch storing the desired target rotation information. Then, the target rotation information stored in the memory switch of this number is output to the rotation control unit. The rotation control unit that has received the target rotation information controls the rotation of the C-arm so that the actual rotation information from the position detection unit matches the target rotation information. When the actual rotation information matches the target rotation information, X-rays are emitted from an X-ray tube to obtain an X-ray image from an X-ray image intensifier. Next, a memory switch of a desired number is sequentially instructed to sequentially perform photographing from multiple directions.

[0007]

By the way, in a cardiovascular angiography examination using an X-ray imaging apparatus, a contrast medium is injected into a subject, and imaging from the following nine directions is generally performed in many cases. ing.

Rotation direction Body axis direction Around body axis "CRAN" "CAUD" "LAO" "RAO" Rotation information 30 °-30 °-Rotation information 30 °-0 ° 0 ° Rotation information 30 °-- 30 ° Pivot information 0 ° 0 ° 30 °-Pivot information 0 ° 0 ° 0 ° 0 ° Pivot information 0 ° 0 °-30 ° Pivot information-30 ° 30 °-Pivot information-30 ° 0 ° 0 ° rotation information -30 ° -30 °

That is, the rotation direction is the body axis direction,
30 ° on head side (CRAN), vertical direction (0 °), foot side
At each rotation angle of 30 ° (CAUD), the direction of rotation is around the body axis, 30 ° to the left (LAO), 30 ° to the vertical (0 °), and 30 ° to the right (RAO). Shooting in a direction represented by a total of nine pieces of rotation information, which is a rotation angle, is performed particularly frequently.

The rotation information of the nine directions is stored in a plurality of memory switches as described above, and the numerical values are sequentially switched by an up-down system, or the numerical values are directly designated by numerical keys. Can specify a specific memory switch. Therefore, there is an advantage that the target switch information in many directions, for example, not only the cardiovascular angiography test but also the target turn information for a circulatory system contrast test can be set in the memory switch.

However, on the other hand, the target rotation information is not recognized by the photographer only by the number of the memory switch, so the C-arm is actually rotated by designating the number of the memory switch, and the C-shaped arm is moved to a desired position. Repeat the designation of the number of the memory switch until the arm is positioned, or store the correspondence between the number of the memory switch and the target rotation information, or set the correspondence between the number of the memory switch and the target rotation information. It is necessary to attach the table to the vicinity of the input unit, and there is a problem that multi-directional imaging becomes complicated.

The present invention has been made in view of such circumstances, and is provided with a memory switch at a position related to a rotation direction and a rotation angle indicated by target rotation information, so that the memory switch is easily and easily provided. It is an object of the present invention to provide an X-ray imaging apparatus capable of quickly performing imaging from multiple directions.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an X-ray imaging apparatus for performing X-ray imaging of a subject from multiple directions, comprising an X-ray tube and an X-ray detector. And the subject lying on the bed in the body axis direction (the rotation direction “CRAN” to the head side and the rotation direction “CAUD” to the foot side) and around the body axis (the head) The rotation direction “LAO” to the left and the rotation direction to the right
AO "), and the position of the support means around the subject, in the body axis direction (" CRAN "and" CAUD ") and around the body axis and their rotation angles. Position detection means for detecting actual rotation information of
The body axis direction (the "CRA"
N "and" CAUD ") and around the body axis (" LA "
O "and" RAO ") and an input means for inputting target rotation information including the respective rotation angles, and the body axis direction (" CRAN "and" CAUD "). And four memory switches arranged correspondingly around the body axis (the "LAO" and "RAO") and two memory switches respectively corresponding to the "CRAN" and the "LAO" A memory switch corresponding to the combination of these operations and the “C
A memory switch corresponding to the combination of these memory switches, which is disposed between two memory switches respectively corresponding to “RAN” and “RAO”; and two memory switches corresponding to “CAUD” and “LAO”, respectively. And a memory switch corresponding to these combination operations disposed between them, and a memory switch corresponding to these combination operations disposed between two memory switches respectively corresponding to the “CAUD” and the “RAO”. With a memory switch, operating means for storing the input target rotation information in the memory switch corresponding to those operations, when the memory switch of the operating means is operated,
A rotation control unit that controls rotation of the support unit so that target rotation information corresponding to the memory switch matches actual rotation information from the position detection unit. .

The operation of the present invention is as follows. First, target rotation information of a target supporting unit is input via the input unit. At this time, the target rotation information is stored in the memory switch associated with the rotation direction and the rotation angle among the eight memory switches of the operation unit. Then, when actually taking a picture, the photographer looks at the operation means and selects and operates a memory switch provided at a position related to the target rotation information. Since a plurality of memory switches provided in the operation means have respective arrangement positions related to the target rotation information, it is possible to photograph which memory switch should be operated to obtain desired [target] rotation information. Can judge. Then, the target rotation information stored in the operated memory switch is output from the operation means to the rotation control means. The rotation control means controls the rotation of the support means so that the input target rotation information and the actual rotation information (actual rotation direction and rotation angle of the support means) from the position detection means match. Control.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view illustrating a schematic configuration of the X-ray imaging apparatus according to the embodiment.

In the figure, reference numeral 1 denotes a C-shaped arm which can move around the subject M. The C-arm 1
The subject M is suspended from the ceiling wall so that
It is arranged in the surrounding space. An X-ray tube 2 and an X-ray image intensifier 3 (X
Line detector) is supported oppositely. This C-shaped arm 1
Is configured to be rotatable in the body axis direction of the subject M and in a direction (rotation direction) around the body axis, and is further configured to rotate in a space around the subject M.

Next, the turning mechanism will be described with reference to a partially cutaway plan view of the C-arm 1 shown in FIG. First,
The rotation of the C-arm 1 (support means) in the body axis direction of the subject M (the head side of the subject M: CRAN, the foot side of the subject M: rotation in the CAUD direction) is performed by the C-arm 1 This is realized by a drive mechanism in the arm holder 4 that holds. A part of a belt (or chain) 5 fixing both ends to the C-arm 1 is housed in the arm holder 4.
Is suspended over the drive roller 6. This drive roller 6
A rotary encoder R1 corresponding to position detection means for detecting the rotation direction and the amount of rotation of the drive motor M1 for rotating the motor is provided in the arm holder 4 (however, shown in the drawing outside the arm holder 4). There). The C-arm 1 is configured to rotate in the body axis direction of the subject M via the belt 5 by the rotating action of the drive motor M1. Reference numeral 7 denotes a driving roller 6 for driving the belt 5.
Is a guide roller for guiding the user.

The rotation of the C-arm 1 about the body axis of the subject M (the rotational direction LAO to the left as viewed from the head side of the subject M and the opposite rotational direction RAO to the right) is the arm. Holder 4
Is rotated around the body axis of the subject M.
The base of the arm holder 4 (the opposite end holding the C-arm 1) is rotatably supported by the side surface of the telescopic arm 8, and a gear 9 is fixed near the supporting surface. Have been. The gear 9 is meshed with a pinion gear 10, and the pinion gear 10 is attached to an output shaft of a drive motor M <b> 2 provided in the telescopic arm 8. The rotation of the drive motor M2 causes the arm holder 4 and C
The arm 1 rotates around the body axis of the subject M. Reference numeral R2 denotes a rotary encoder that detects the rotation direction and the amount of rotation of the drive motor M2 and corresponds to a position detection unit.

The above-described telescopic arm 8 vertically expands and contracts in a direction perpendicular to the body axis of the subject M.
It is held at the lower end of a U-shaped rotating arm 11. The other end of the rotating arm 11 is fixed to a rotating body 12, and the rotating body 12 is based on a rotating base 13 fixed to a ceiling wall of an examination room where an X-ray imaging apparatus is installed. Rotate. The driving motor M3 rotates the rotating body 12.
R3 is a rotary encoder that detects the position of the C-arm 1 in the surrounding space of the subject M by detecting the direction and amount of rotation of the rotating body 12.

As described above, the C-shaped arm 1 supporting the X-ray tube 2 and the X-ray image intensifier 3 is rotated by the drive motor M3 in the space around the subject M, and the drive motor M1 The drive motor M2 is configured to rotate around and around the body axis of the subject M.

A control system for controlling each rotation described above is configured as shown in FIG. Note that the illustration of the X-ray imaging apparatus is simplified in FIG.

Reference numeral 20 designates each rotation direction and rotation angle of the C-shaped arm 1, and is an operation panel provided with a plurality of switches. The operation panel 20 is a unit for inputting target rotation information including a desired rotation direction and rotation angle, and corresponds to an input unit in the present invention. The CPU 21 inputs the target rotation information from the operation panel 20, controls the rotation direction and rotation angle (actual rotation information corresponding to the rotation direction and the rotation angle) of the drive motor M1 and the drive motor M2, Control is performed so that the actual rotation information matches the target rotation information. Therefore, the CPU 21 corresponds to the rotation control means in the present invention. Also, MD
Reference numeral 1 and MD2 denote a motor drive circuit that rotationally drives each of the drive motors M1 and M2 in response to a command signal from the CPU 21. MD3 denotes a motor drive circuit that rotationally drives the drive motor M3 in response to an operation signal from the operation panel 20. It is.

The display panel 22 displays the rotation directions (CRAN, CAU) of the drive motors M1 and M2, which are the actual rotation information.
D, LAO, RAO), the rotation angle, and the target rotation information stored in a memory switch, which will be described later, to display the information to the photographer. While the CPU 21 controls the actual rotation information to match the target rotation information, the display control unit 23 blinks the rotation direction and the rotation angle or displays the rotation when the two information match. This is for controlling the display panel 22 such as stopping the blinking of the moving direction and the rotation angle and turning on the light.

The additional operation panel 30 has a function for storing and retrieving the target rotation information when the photographer inputs the target rotation information via the operation panel 20. This additional operation panel 30 includes nine memory switches 30a to 30a.
0i and the target rotation information input via the operation panel 20 are stored in one of the memory switches 30a to 30i, or when the memory switches 30a to 30i are pressed,
A SET switch 30j is provided for instructing the CPU 21 to start the rotation control so that the corresponding target rotation information and the actual rotation information match.

Each of the memory switches 30a to 30i is arranged as shown in FIG.
As shown in (2), the subject M is disposed at a position on the additional operation panel 30 associated with the rotation direction and the rotation angle of the subject M in plan view. That is, the memory switch 30a
Is disposed at a position indicating the CRAN and LAO directions,
The memory switch 30b is arranged at a position indicating only the CRAN direction, and the memory switch 30c is arranged at a position indicating the CRAN and RAO directions. Further, the memory switch 30d is disposed at a position indicating only the LAO direction, and the memory switch 30e is disposed at a position indicating that the rotation angle is 0 ° with respect to any rotation direction. Reference numeral 30f is provided at a position indicating only the RAO direction. Similarly, each memory switch 30g, 30
h, 30i are the CAUD and LAO directions, respectively, C
It is arranged only in the AUD direction at a position indicating the CAUD and RAO directions.

The target rotation information memory 40 includes the additional operation panel 3
The target rotation information corresponding to each of the 0 memory switches 30a to 30i is stored. The target rotation information is input by the operation panel 20 and the memory switches 30a to 303
When one of the switches 0i is depressed and a setting storage switch (not shown) on the operation panel 20 is depressed, the target rotation information is stored in the corresponding address via the CPU 21. Additional operation panel 30
Corresponds to the operation means in the present invention, and the memory switches 30a to 30i and the target rotation information memory 40 correspond to the memory switches in the present invention.

Next, with reference to a flowchart shown in FIG. 5, a description will be given of a target rotation information setting process which is a process performed in advance before photographing and sets target rotation information in a memory switch. As the target rotation information, information frequently used in a cardiovascular angiography test described in the conventional example will be described as an example.

In step S1, target rotation information (rotation direction and rotation angle) is set via the operation panel 20. Specifically, as shown in FIGS. 6A and 6B, CRAN
The target rotation information is set to be 30 ° in the direction and 30 ° in the LAO direction.

In step S2, the memory switch corresponding to the target rotation information set in step S1 is pressed.
Here, CRAN and LAO on the additional operation panel 30
Memory switch 30a disposed at a position indicating the direction
Press. Then, by pressing a setting storage switch (not shown) on the operation panel 20, the set target rotation information (CRAN30 °, LAO30 °) is stored in the target rotation information memory 40 (step S3).

In step S4, it is determined whether or not to end the setting, and the process branches. Here, since there are eight pieces of target rotation information that need to be set, the process returns to step S1 and continues.

By repeating steps S1 to S4 as described above, each of the memory switches 30b to 30i is set as follows.
0] The target rotation information is set.

Memory switch Target rotation information Reference diagram 30b... CRAN: 30 ° LAO / RAO: 0 ° FIGS. 7A and 7B 30c... CRAN: 30 ° RAO: 30 ° FIG. ), (B) 30d ... CRAN / CAUD: 0 ° LAO: 30 ° Figures 9 (a), (b) 30e ... CRAN / CAUD: 0 ° LAO / RAO: 0 ° Figure 10 (a), (B) 30f CRAN / CAUD: 0 ° RAO: 30 ° FIGS. 11 (a), (b) 30g… CAUD: 30 ° LAO: 30 ° FIGS. 12 (a), (b) 30h … CAUD: 30 ° LAO / RAO: 0 ° Fig. 13 (a), (b) 30i ……… CAUD: 30 ° RAO: 30 ° Fig. 14 (a), (b)

The target rotation information is stored in the target rotation information memory 40 corresponding to the memory switches 30a to 30i by the CPU 21. This state is shown in the schematic diagram of FIG. That is, corresponding to the memory switches 30a to 30i, the target rotation information is stored from upper to lower addresses, and the target rotation information corresponding to one memory switch is stored in two addresses (CRAN / CAUD, LA below
O / RAO). Note that various storage methods can be adopted as the storage method of the target rotation information as long as it can be associated one-to-one with the memory switch.

Next, the X-ray imaging processing will be described with reference to FIG. In step U1, the photographer selects the memory switch groups 30a to 30 arranged on the additional operation panel 30.
From i, a switch provided at a position indicating the target rotation information is selected and pressed. Since these nine memory switches 30a to 30i are arranged at positions on the additional operation panel 30 related to the turning direction and the turning angle as shown in FIG. 4, the desired target turning information can be easily obtained. Can be selected. Specifically, the description will be made on the assumption that the photographer desires to photograph in the state shown in FIG. 6 (CRAN30 °, LAO30 °). Since the additional operation panel 30 is provided with each of the memory switches 30a to 30i as shown in FIG. 4, the photographer looks at the additional operation panel 30 and turns the memory switch 30a in the CRAN and LAO directions. It can be easily and quickly determined that the information is the target rotation information.

In step U2, the target rotation information memory 40 corresponding to the memory switch selected in step U1
Is read out by the CPU 21. Specifically, the target rotation information (CRAN30 °, LAO30 °) is read from the address of the target rotation information memory 40 corresponding to the memory switch 30a (see FIG. 15). The read target rotation information is displayed on the display panel 22 via the display control unit 23.

In step U3, the target rotation information read out in step U2 and the actual rotation information coincide with each other.
By pressing the SET switch 30j of the additional operation panel 30, the rotation control is started. Thus, even if the photographer accidentally presses the memory switch, the SET switch 30
Since the C-arm 1 does not start rotating until j is pressed, the rotation of the C-arm 1 unintended by the photographer can be prevented, and the subject M and the photographer can be protected. In the rotation control, the CPU 21 drives the motor M1 to rotate in the CRAN direction to control the rotation so that the rotation angle from the rotary encoder R1 becomes 30 °, and drives the motor M2 to rotate in the LAO direction to rotate the rotary encoder R2. Rotation angle from
It is performed to be 30 °. That is, the rotation control is performed so that the target rotation information and the actual rotation information from the position detection unit match. At this time, if the target rotation information does not match the actual rotation information, the display control unit 23 causes the display control unit 23 to blink the target rotation information displayed on the display panel 22 so that the target rotation information is turned on when the target rotation information matches. Control. This allows the photographer to determine whether the target rotation information and the actual rotation information match.

In step U4, X-ray irradiation is performed. Specifically, the CPU 21 controls a high-voltage generator (not shown) to supply a high voltage necessary for X-ray irradiation to the X-ray tube 2. Then, an X-ray image is obtained from the X-ray image intensifier 3.

In step U5, it is determined whether or not the photographing is to be ended, and the process branches. Here, since it is necessary to perform imaging in the remaining eight directions necessary for the cardiovascular angiography examination, the process returns to step U1 and repeats steps U1 to U5. At the time of this repetition, the photographer can easily select the next required target rotation information from the nine memory switches 30a to 30i of the additional operation panel 30. Therefore, it is possible to easily and quickly perform multi-directional imaging.

In this embodiment, the memory switch 3
Although 0a to 30i are push-type switches, they may be touch-type memory switches in which these switches are displayed on a liquid crystal display panel having a touch screen.
In addition, a joystick capable of instructing multiple directions is provided near the center of the additional operation panel 30 and the additional operation panel 3
A plurality of memory switches may be built in the unit 0 so as to detect the direction specified by the joystick.

In this embodiment, a cardiovascular angiography test is taken as an example and imaging from nine directions has been described. However, if a memory switch is provided at a position related to the rotation direction and the rotation angle, It can be implemented in any direction.

Also, an X-ray imaging apparatus having a structure in which a C-shaped arm (support means) is suspended from the ceiling has been described as an example of the X-ray imaging apparatus. The present invention can also be implemented by an X-ray imaging apparatus that rotates around, and the supporting means is not limited to the C-arm.

[0042]

As is apparent from the above description, according to the present invention, the plurality of memory switches provided in the operating means are arranged at the respective positions of the rotation direction and the rotation angle of the target rotation information. Therefore, the photographer can determine which memory switch should be pressed to obtain desired rotation information. Therefore, X-ray imaging from multiple directions can be performed easily and quickly.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a schematic configuration of an X-ray imaging apparatus according to an embodiment.

FIG. 2 is a partially broken plan view showing a rotation mechanism of a C-arm.

FIG. 3 is a schematic block diagram showing a control system of the apparatus.

FIG. 4 is a schematic diagram illustrating a relationship between an additional operation panel, a rotation direction, and a rotation angle.

FIG. 5 is a flowchart illustrating a target rotation information setting process.

FIG. 6 is a plan view showing a rotation direction and a rotation angle of a C-shaped arm.

FIG. 7 is a plan view showing a rotation direction and a rotation angle of the C-arm.

FIG. 8 is a plan view showing a rotation direction and a rotation angle of a C-shaped arm.

FIG. 9 is a plan view showing a rotation direction and a rotation angle of a C-arm.

FIG. 10 is a plan view showing a rotation direction and a rotation angle of a C-shaped arm.

FIG. 11 is a plan view showing a rotation direction and a rotation angle of a C-arm.

FIG. 12 is a plan view showing a rotation direction and a rotation angle of a C-shaped arm.

FIG. 13 is a plan view showing a rotation direction and a rotation angle of a C-arm.

FIG. 14 is a plan view showing a rotation direction and a rotation angle of a C-shaped arm.

FIG. 15 is a schematic diagram showing the contents of a target rotation information memory.

FIG. 16 is a flowchart showing an X-ray imaging process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... C-arm 2 ... X-ray tube 3 ... X-ray image intensifier 20 ... Operation panel 22 ... Display panel 30 ... Additional operation panel 30a-30i ... Memory switch 30j ... SET switch M ... Subject M1-M3 ... Motor R1 to R3 ... rotary encoder 57

Claims (1)

[Claims] 1. An X-ray apparatus for performing X-ray imaging from multiple directions of a subject.
An X-ray imaging apparatus, which supports an X-ray tube and an X-ray detector so as to face each other, and moves the subject lying on a bed in the body axis direction (the direction of rotation “CRAN” toward the head side and toward the foot side). Rotation direction "C
AUD ") and around the body axis (the direction of rotation" LAO "to the left and the direction of rotation to the right" RAO "when viewed from the head).
And the position of the support means around the subject in the body axis direction (the “CRA
N "and" CAUD ") and position detection means for detecting actual rotation information about the body axis and their rotation angles, and the body axis directions (the" CRAN "and" CAUD ") intended by the support means. )) And around the body axis (the above-mentioned “LAO” and “RAO”) and a combination thereof, and a total of eight directions, input means for inputting target rotation information including respective rotation angles, and the body axis direction ( The "CRAN" and "CAU"
D ") and around the body axis (" LAO "and" RA
O "), and four memory switches corresponding to the combination of these memory switches disposed between the two memory switches respectively corresponding to the" CRAN "and the" LAO ". , Said "CRA
N "and two memory switches respectively corresponding to the" RAO "and the memory switch corresponding to the combination operation thereof, the" CAUD "and the" LAO ".
"O" and two memory switches corresponding to these combination operations, which are disposed between two memory switches respectively corresponding to "O", and two memory switches respectively corresponding to "CAUD" and "RAO". Operating means for storing the input target rotation information in the memory switch corresponding to those operations, and a memory switch of the operating means. And turning control means for controlling the turning of the supporting means so that the target turning information corresponding to the memory switch coincides with the actual turning information from the position detecting means. An X-ray imaging apparatus characterized in that: