JP4751130B2 - Image processing device - Google Patents

Description

  The present invention relates to an image processing apparatus that includes a sensor that detects X-rays, arranges the sensor in the oral cavity, and obtains images of teeth and jawbone by X-rays generated from an X-ray generator from outside the oral cavity.

  In recent years, instead of film, an image processing apparatus of a system (hereinafter referred to as a digital system) using an X-ray sensor provided with a phosphor that converts X-rays into light on a semiconductor sensor such as a CCD or CMOS has been spreading. In this digital method, an X-ray image signal is taken out from an X-ray sensor, converted into digital data by a data processing device, a display image is generated, and the X-ray image is displayed on a display such as a CRT or a liquid crystal display.

Compared with the conventional film system, the digital system described above
1) Real-time observation possible
2) No development device or waste liquid treatment required
3) High light reception sensitivity and reduced X-ray irradiation amount,
4) Easy image processing such as enlargement and gradation correction,
5) There is no secular change in the captured image and it is easy to compare before and after treatment.
6) There are many advantages, such as not taking a storage place.

  In the conventional digital method, X-ray image signals corresponding to each pixel output from the X-ray sensor are acquired in the order of output, and are arranged according to the width and height of the X-ray sensor to create a display image. On the display. At this time, the display is performed so that the pixels at the four corners of the X-ray sensor are always at fixed positions in the display image.

  In addition, among conventional digital image processing apparatuses, an X-ray image is displayed in a mirror-inverted manner when a person manipulates the display image to promote understanding of the patient. (See, for example, Patent Document 1 below).

FIG. 21 is a block diagram showing an electrical configuration of the above-described conventional image processing apparatus.
In the image processing apparatus having the configuration shown in FIG. 21, when the exposure switch 102 of the X-ray control apparatus 101 is pressed, X-rays are emitted from the X-ray generation apparatus 103 for a predetermined time. When the X-rays reach the X-ray sensor 105 through the subject 104, charges corresponding to the X-ray image irradiated to the X-ray sensor 105 are accumulated, and after completion of the X-ray exposure, the image signal SG is time-sequentially. Is output. The image signal SG from the X-ray sensor 105 is input to the preamplifier 106, amplified to a predetermined level, input to the AD conversion circuit 107 at the next stage, and converted into a digital value. At this time, the DMA controller 108 occupies the bus 109, and the image data output from the AD conversion circuit 107 is sequentially stored in a part of the main memory 110 via the bus 109.

The image data stored in the main memory 110 is arithmetically processed by the CPU 111 and stored again in a part of the main memory 110.
The image data stored in the main memory 110 is transferred to the image memory 112 by the DMA controller 108. The contents stored in the image memory 112 are read out to the DA conversion circuit 113 in time series. The DA conversion circuit 113 converts the digital image data into an analog video signal VD, and monitors the monitor 114 and the video printer 115. Output to.

In data transfer from the main memory 110 to the image memory 112, it is first determined whether the instruction of the reverse display switch 116 is normal display or reverse display. In the case of normal display, the CPU 111 transfers the image data to the image memory 112 in the normal order according to the arrangement of the image data in the main memory 110. On the other hand, if reverse display is instructed, the CPU 111 transfers the image data array in the main memory 110 to the image memory 112 in reverse order so as to reverse the mirror image.
JP 7-148162 A (page 4-5, FIG. 2)

  However, the above-described conventional image processing apparatus does not have a function for obtaining the arrangement state of the X-ray sensor 105 in the oral cavity, and the four corner pixels of the X-ray sensor 105 display the output from the X-ray sensor 105. Therefore, the image is always displayed at a fixed position, and there is a problem that an image in consideration of the arrangement state of the X-ray sensor 105 in the oral cavity cannot be displayed.

  For this reason, the X-ray sensor 105 is arranged in various orientations in the oral cavity depending on the position of the tooth to be imaged, etc., but the display image is always displayed in a fixed orientation. When seeing, the problem was that it was difficult to know which tooth was taken.

  Further, the arrangement of the X-ray sensor 105 in the oral cavity is restricted due to the presence of a cable or the like. For example, with respect to the cable, the cable extends from the X-ray sensor 105 to the front side in the oral cavity and must be disposed in the oral cavity.

FIG. 22 shows an arrangement state of the X-ray sensor when the X-ray sensor is arranged on the left upper jaw. FIG. 23 shows an arrangement state of the X-ray sensor when the X-ray sensor is arranged on the right lower jaw.
As shown in FIG. 22, when the X-ray sensor is arranged on the left upper jaw, as shown in FIG. 22A, when the X-ray sensor is viewed through the imaging object, the cable is arranged so as to extend downward, As shown in FIG. 22B, when the X-ray sensor is viewed through the object to be imaged, the cable is usually arranged to extend in the left direction.

  Further, as shown in FIG. 23, when the X-ray sensor is arranged on the right lower jaw, as shown in FIG. 23A, the cable is arranged so as to extend upward when the X-ray sensor is viewed through the object to be imaged. Or, as shown in FIG. 23B, when the X-ray sensor is viewed through the object to be imaged, the cable is usually arranged to extend in the right direction.

  22 and 23, when the position of the black circle in the X-ray sensor shown in FIGS. 22 and 23 is fixed to the lower left of the display image, the display image is shown in FIG. As shown. In both of the arrangement states shown in FIGS. 22 (a) and 23 (a), it is displayed as shown in FIG. 24 (a), and only the left upper jaw and the right lower jaw can be determined by looking at FIG. 24 (a). I don't know if it's taken. In addition, both the arrangement states shown in FIGS. 22B and 23B are displayed as shown in FIG. 24B, and the teeth are turned upside down with respect to the arrangement state shown in FIG. 24B. It will be displayed upside down, and it will be upside down from the image of the teeth that people imagine with their heads.

  In such a display method, when the displayed image is viewed, it is difficult to intuitively know which position the tooth was photographed, and in some cases, it is difficult to know which tooth was photographed.

  In the conventional image processing apparatus, since the orientation of the display image is fixed, a personal computer (hereinafter referred to as a PC) is used so that the display image can be mirror-inverted or rotated by an instruction by a human operation. ) Etc., it was realized by the application on the interface.

  However, even if such an application is prepared, in order to change the image to an appropriate orientation, it is necessary for each person to perform an operation on each image, and it is possible to shoot continuously at a time. If you do this, you cannot say that the problem has been solved sufficiently.

An example of shooting continuously at a time is shown below.
In dentistry, there are photographing and image display methods such as a 10-sheet method and a 14-sheet method. A plurality of images are taken with all the teeth in the oral cavity as subjects, and are arranged so that the mutual positional relationship of the teeth in these images is the same as the mutual positional relationship in the oral cavity for diagnosis. Image display examples of the respective photographing / image display methods are shown in FIGS. FIG. 25 shows the 10-sheet method, and FIG. 26 shows the 14-sheet method.

  As seen in FIGS. 25 and 26, the X-ray sensor is arranged in the oral cavity in various directions depending on the tooth to be imaged. In order to understand the state of teeth in the oral cavity, it can be seen in these images that the teeth stored in the image data are displayed in the left and right positions in the oral cavity. The image is easy to understand. Therefore, in the display image when the front teeth of the upper jaw are photographed with the longitudinal direction of the X-ray sensor being arranged along the vertical direction, the image is displayed vertically and the teeth in the image are displayed with the tooth tips facing downward. When the lower molars are photographed so that the longitudinal direction of the X-ray sensor is aligned along the horizontal direction, it is desirable that the displayed image is displayed with the image being horizontally long and the tooth tip facing upward.

  Even if the display image has an operation function such as rotation depending on the application, in a situation where an appropriate rotation angle must be selected for each image to be captured, the operation must be performed on the PC each time the image is captured. In addition, when an appropriate display method is selected for each image after continuous shooting, it is necessary to remember how the appropriate selection was made for each image.

  Therefore, there is a problem that it takes a lot of time and effort to display each captured image in the proper orientation, and in some cases forget how to rotate it to get the proper orientation. The situation was that the display could not be performed properly due to rotation or accidental rotation.

  It is an object of the present invention to provide an image processing apparatus capable of processing an image to be displayed so that the tooth contained in the image is the same as the orientation in the oral cavity without bothering human hands. To do.

In order to solve the above problems, an image processing apparatus according to the present invention is an image processing apparatus that obtains images of teeth and jawbones by X-rays,
An X-ray sensor that is placed in the oral cavity and accumulates charges according to the X-ray image of the subject;
A sensor control unit for controlling driving of the X-ray sensor;
The charge signal output from the X-ray sensor is converted into digital data, and the converted digital data is processed according to the number of pixels in the width direction and height direction of the X-ray sensor to create image data An image processing unit to
An inclination detector that detects the inclination of the X-ray sensor and outputs a signal corresponding to the inclination;
An arrangement deriving unit for obtaining an arrangement state of the X-ray sensor from an output signal of the inclination detection unit and outputting a signal indicating the arrangement state;
An image adjusting unit that adjusts the orientation of image data from the image processing unit based on the arrangement state indicated by the arrangement deriving unit ;
A clock generator for generating a clock;
An X-ray irradiation detection unit that detects whether or not X-rays are being irradiated;
The tilt detection unit outputs a tilt detection signal in synchronization with the clock from the clock generation unit,
While the signal from the X-ray irradiation detection unit indicates that X-ray irradiation is being performed, the arrangement deriving unit synchronizes with the clock from the clock generation unit and detects the tilt detection signal from the tilt detection unit. Are repeatedly obtained, and the arrangement state of the X-ray sensor is obtained from the obtained plurality of inclination detection signals .

With this configuration, the arrangement state of the X-ray sensor in the oral cavity can be obtained, and the image data can be adjusted in an appropriate direction according to the arrangement state, and the output of the inclination detection unit is temporarily appropriate due to human shaking or the like. Even if it is lost or not kept constant, the image data can be adjusted to an appropriate orientation.

  Further, the inclination detection unit is arranged along the inner periphery of the inner surface of the housing, facing the upper and lower sides of the inner surface of the housing, and has a number for individually identifying the other electrode plate element. It is composed of a plurality of electrode plate elements that are swung and a conductor that can move freely inside the housing, and is in contact with one of the electrode plate elements and in contact with one of the counter electrode plates to short-circuit the current state. It has a moving body to produce.

  With this configuration, the tilt of the housing can be detected, the arrangement state of the X-ray sensor in the oral cavity can be obtained, and the image data can be adjusted in an appropriate direction according to the arrangement state.

  Further, the tilt detector is a metal having a resistance value per known unit length, which is continuously arranged along the inner circumference of the inner surface of the casing, with the counter electrode plates disposed on the upper and lower sides of the casing inner surface. And an electrode plate element which is arranged along the inner periphery of the inner surface of the casing and is in contact with any of the electrode plates of the counter electrode plate. And a moving body that is short-circuited in contact with any one to generate an energized state.

  With this configuration, the tilt of the housing can be detected, the arrangement state of the X-ray sensor in the oral cavity can be obtained, and the image data can be adjusted in an appropriate direction according to the arrangement state.

  As described above, according to the present invention, the inclination detection unit detects the inclination of the X-ray sensor, the arrangement deriving unit obtains the arrangement state of the X-ray sensor in the oral cavity, and the image adjustment unit obtains the X-ray sensor from the X-ray sensor. By adjusting the orientation of the image data so as to match the arrangement state of the X-ray sensor, it is possible to display an image in which the orientation of the tooth in the image is the same as that of the tooth that is the subject. This eliminates the hassle of human operations to correct the orientation of the image, and when a person views the image, the state of the tooth in the image and the state of the tooth in the oral cavity can be easily linked. Diagnosis can proceed smoothly.

<First Embodiment>
FIG. 1 is a block diagram showing the configuration of the image processing apparatus according to the first embodiment of the present invention.
An image processing apparatus shown in FIG. 1 includes an X-ray generator 2 for irradiating a subject 1 with X-rays, an X-ray sensor 3 in which charges corresponding to the irradiated X-ray image are accumulated, and an X-ray sensor. 3 converts the charge signal output from the X-ray sensor 3 into digital data, and converts the converted digital data into the number of pixels in the width direction and height direction of the X-ray sensor. From an image processing unit 6 that performs processing for aligning and creating image data, an inclination detection unit 7 that detects an inclination of the X-ray sensor 3 and outputs a signal corresponding to the inclination, and a signal from the inclination detection unit 7 An arrangement deriving unit 8 that obtains the arrangement state of the sensor and outputs a signal indicating the arrangement state, and an image adjustment unit 9 that adjusts the orientation of image data from the image processing unit 6 based on the arrangement state indicated by the arrangement deriving unit 8 It has.
FIG. 27 is a diagram showing an example of the system configuration of the image processing apparatus according to the first embodiment of the present invention.
The image processing apparatus shown in FIG. 27 includes an X-ray sensor 3, an inclination detection unit 7, a sensor control unit 4, an image processing unit 6, an arrangement derivation unit 8, and an image adjustment unit 9, and a display for displaying images. 23.
The arrangement deriving unit 8 may be fixed to the X-ray sensor 3 together with the inclination detecting unit 7 instead of inside the unit box 22.
Further, as shown in FIG. 28, a computer 24 may be added to the configuration, and the image processing unit 6 may be realized in the computer 24.
Similarly, the arrangement deriving unit 8 and the image adjusting unit 9 may be realized in the computer 24.
In FIGS. 27 and 28, the X-ray sensor 3, the tilt detection unit 7, and the unit box 22 are shown as transmitting signals via cables, but the signals may be transmitted wirelessly.

The operation of the image processing apparatus configured as described above will be described.
First, the X-ray sensor 3 is arranged to photograph the subject 1 in the oral cavity.
Next, X-rays are emitted from the X-ray generator 2, and a charge signal corresponding to the X-ray image of the subject 1 is generated in the X-ray sensor 3.

  The sensor control unit 4 controls driving of the X-ray sensor 3. As a basic control method, during X-ray irradiation, a drive signal for transferring charges in the X-ray sensor 3 is not transmitted, and charges generated by X-ray irradiation are generated in the X-ray sensor 3. In addition, after the X-ray irradiation is stopped, a drive signal is transmitted to transfer the charge accumulated in the X-ray sensor 3 and the charge signal generated in the X-ray sensor 3 is transmitted. The image processing unit 6 outputs it. The image processing unit 6 converts the charge signal output from the X-ray sensor 3 into digital data, and then aligns the digital data according to the number of pixels in the width direction and the height direction of the X-ray sensor 3, create.

On the other hand, the inclination detection unit 7 detects the inclination of the X-ray sensor 3 in the oral cavity, and sends a signal corresponding thereto to the arrangement deriving unit 8. The arrangement deriving unit 8 obtains the arrangement state of the X-ray sensor 3 based on the signal from the tilt detection unit 7, and the image adjustment unit 9 matches the three arrangement states of the X-ray sensor obtained by the arrangement deriving unit 8. Then, the image data created by the image processing unit 6 is rotated to create a display image.
Here, the arrangement state of the X-ray sensor 3 is a state (what is called) which direction is a vertically downward direction when viewed from the center of the X-ray sensor 3 when the X-ray sensor 3 is arranged in the oral cavity. (Tilt).

In this process, the operation in which the tilt detection unit 7 detects the tilt of the X-ray sensor 3 will be described in detail.
FIG. 2 is a diagram showing the relationship between the X-ray sensor 3 and the tilt detector 7. The inclination detection unit 7 is fixed at a position located on the back side of the X-ray sensor 3 when viewed from the X-ray incident direction.

  FIG. 3 is a diagram illustrating a configuration of the tilt detection unit 7. The inclination detection unit 7 includes an inclination sensor unit 10 and an inclination signal generation unit 11.

  4A and 4B are cross-sectional views showing the structure of the tilt sensor unit 10, wherein FIG. 4A is a cross-sectional view passing through the central axis of the counter electrode plate in the casing of the tilt sensor unit 10, and FIG. 4B is the central axis of FIG. FIG. The tilt sensor unit 10 represents the outer shape of the tilt detection unit 7, and is disposed along the counter electrode plate 12 disposed on the upper and lower bottoms facing the inner surface of the housing, and the inner periphery of the inner surface of the housing of the tilt sensor unit 10. An electrode plate 13 composed of a plurality of electrode plate elements 13-i (i = 1 to 16 in the present embodiment) that are fixedly arranged and individually assigned numbers for identification with other electrode plate elements; The sphere 14 is made of a conductor made of a material (conductor) that conducts electricity as a moving body that freely moves inside the tilt sensor unit 10. FIG. 4 shows an example in which the electrode plate 13 is composed of 16 pieces and the circumferential position is divided into 16 parts.

  FIG. 5 is a circuit diagram for explaining the function of the inclination detector 7. A portion surrounded by a dotted line in FIG. 5 corresponds to the tilt sensor unit 10, the A end of each switch represents the electrode plate 12, the B end represents the electrode plate 13, and the switch represents the sphere 14 made of a conductor. In the tilt signal generator 11, there is an input terminal P connected to the A end of each switch, and each input terminal P is numbered. There is also an output terminal Output that outputs a signal according to the input value of the input terminal P. The signal output from the output terminal Output has a bit number larger than the number of input terminals P, each bit has a bit number indicating how many bits from the lower order, and the same number is assigned. It takes a value corresponding to the input value of the input terminal P. When the input value of the input terminal P is GND, the value of the bit corresponding to the input terminal P is 0, and when the input value of the input terminal P is + V, the value of the bit corresponding to the input terminal P is 1. . FIG. 5 shows a state in which a switch corresponding to the input terminal P2 is turned on, and as a result, a signal whose lower second bit is 1 is output from the output signal Output.

FIG. 6 is a diagram for explaining a process in which an output signal of the tilt signal generation unit 11 is determined when the tilt detection unit 7 is arranged with a certain tilt in the oral cavity together with the X-ray sensor 3.
The inclination detection unit 7 is disposed in the oral cavity together with the X-ray sensor 3. The sphere 14 made of a conductor in the inclination detection unit 7 follows the attractive force in the inclination sensor unit 10 according to the state in which the inclination detection unit 7 is arranged, and is positioned at the lowest position in the vertical direction along the inner periphery of the inclination sensor unit 10. stay.

  FIG. 6 shows a state in which the sphere 14 made of a conductor remains at the position of the electrode plate element 13-2. Accordingly, the electrode plate 13-2 and the electrode plate 12 at the position where the sphere 14 made of the conductor stays are connected through the sphere 14 made of the conductor. In the circuit diagram shown in FIG. 5, the switch corresponding to the electrode plate 13-2 is turned on, and the input value of the input terminal P2 corresponding to the switch is changed from GND to + V. Therefore, the lower second bit is set to 1 in the signal from the output terminal Output, and is output.

Next, the operation in which the arrangement deriving unit 8 obtains the arrangement state of the X-ray sensor based on the signal from the inclination detection unit 7 will be described in detail.
FIG. 7 shows a flowchart of the operation for obtaining the arrangement state of the X-ray sensor 3 in the arrangement deriving unit 8. Here, the arrangement deriving unit 8 includes a “table indicating the correspondence between the input terminal P of the tilt detection unit 7 and the electrode plate 13” 15 and “the positional relationship between the reference electrode plate 13 and another electrode plate. A “showing table” 16 is provided in advance.

  In the “table indicating the correspondence between the input terminal P of the inclination detecting unit 7 and the electrode plate 13” 15, the number of the input terminal P and the number of the electrode plate 13 correspond one-to-one as in the structure shown in FIG. 8. When the number of the input terminal P is selected, the corresponding number of the electrode plate 13 is obtained.

  Further, the “table showing the positional relationship between the reference electrode plate 13 and other electrode plates” 16 is the number of each electrode plate 13 and the reference to each electrode plate 13 as in the structure shown in FIG. The positional relationship between the electrode plate 13 and the electrode plate 13 is one-to-one. When the number of each electrode plate 13 is selected, the positional relationship between the selected electrode plate 13 and the reference electrode plate 13 can be obtained. ing.

  In FIG. 9, the electrode plate 13-1 is used as a reference electrode plate 13, and each electrode plate 13 is viewed from the reference electrode plate 13 when the tilt sensor unit 10 is viewed from the back side with the X-ray irradiation direction as the front side. The positional relationship is represented by a numerical value indicating how many positions left and right are seen. When each electrode plate 13 is on the right side when viewed from the reference electrode plate 13, a sign of + (plus) is attached, and when it is on the left side, a sign of − (minus) is attached. The electrode plate 13 in front of the reference electrode plate 13 has a + (plus) sign.

  As shown in FIG. 7, the arrangement deriving unit 8 checks how many bits are 1 in the input signal from the inclination detecting unit 7 (step S71). In the case of FIG. 6, it is required to be the second least significant bit. Since the lower second bit is 1, it can be seen that the input terminal P2 is switched on.

Next, the number of the electrode plate 13 corresponding to the input terminal P2 is obtained (step S72). The electrode plate 13-2 is required from the table 15 shown in FIG.
Next, the positional relationship between the obtained electrode plate 13-2 and the reference electrode plate 13 is obtained (step S73). The positional relationship 1 is obtained from the table 16 shown in FIG. This positional relationship 1 is output as an arrangement state.
“The arrangement state is positional relationship 1” means that the X-ray sensor 3 and the inclination detection unit 7 are arranged in the oral cavity in a posture in which the electrode plate element 13-2 is vertically downward. Will be expressed.

Next, the operation of adjusting the orientation of the image data from the image processing unit 6 by the image adjusting unit 9 based on the arrangement state output from the arrangement deriving unit 8 as described above will be described in detail.
FIG. 10 shows a flowchart of an operation for adjusting the orientation of the image data in the image adjusting unit 9. Here, the image adjusting unit 9 includes a “table indicating the image rotation angle corresponding to the arrangement information” 17, a “table indicating the default rotation angle corresponding to each electrode plate 13” 18, and a “reference electrode plate”. The table 13 indicating “13” is provided in advance.

  In the “table indicating the image rotation angle corresponding to the arrangement information” 17, the image rotation angle to which the image data is to be rotated is set corresponding to each arrangement state as in the structure shown in FIG. 11.

  Further, in the “table indicating the default rotation angle to which each electrode plate 13 corresponds” 18, image data is rotated when each electrode plate 13 is a reference electrode plate 13 as in the structure shown in FIG. 12. Power default rotation angle is set.

  Further, in the “table showing the reference electrode plate 13” 19, the number of the reference electrode plate 13 is set as in the structure shown in FIG. Here, an electrode plate 13-1 is set as the reference electrode plate 13.

  As shown in FIG. 10, the image adjusting unit 9 obtains an image rotation angle corresponding to the signal 1 representing the arrangement state given from the arrangement deriving unit 8 from the table 17 shown in FIG. Obtain (step S101).

  Next, it is obtained from the table 19 indicating the reference electrode plate shown in FIG. 13 that the reference electrode plate 13 is 13-1, and the default corresponding to the electrode plate 13-2 from the table 18 shown in FIG. A rotation angle of -90.0 degrees is obtained (step S102).

  Next, a display image is created by rotating the image data from the image processing unit 6 by adding the image rotation angle of −22.5 degrees and the default rotation angle of −90.0 degrees to a total of −112.5 degrees (step S100). S103).

  In the tilt detection unit 7, the numbers assigned to the electrode plates 13 and the numbers assigned to the input terminals P may be the same. In that case, the table 15 shown in FIG. 8 becomes unnecessary, and the number of the electrode plate 13 can be directly obtained from the bit number. Thereby, a process step can be shortened, a process can be simplified, and a process can be performed more rapidly.

Further, in the inclination detection unit 7, it is not necessary to associate the same number between the number of the input terminal P and the bit number of the signal from the output terminal Output. This increases the degree of freedom in software creation. In this case, a table showing the correspondence between the number of the input terminal P and the bit number of the signal from the output terminal Output is prepared, and by referring to it, the arrangement deriving unit 8 determines the signal from the output terminal Output. Find the input terminal P with the switch on.
The electrode plate 13 of the tilt sensor unit 10 may be a single electrode plate that covers the entire inner periphery, and the electrode plate 12 may be divided into two or a plurality of electrode plates. Thereby, a processing process can be simplified.

  Further, when the X-ray sensor 3 and the tilt detection unit 7 are arranged in the oral cavity, the sphere 14 made of a conductor stays between two adjacent electrode plates 13 due to the tilt, and the tilt signal generation unit 11 receives two inputs. When the terminals Pb and Pc have an input value of + V, the bit corresponding to each of the input terminals Pb and Pc in the signal from the output terminal Output becomes 1, and as a result, even if the two bits become 1 and are output. Good. In that case, after obtaining the image rotation angle for each, the average angle is obtained, the average angle is added to the default rotation angle, and the image data is rotated by that angle. Thereby, an angle adjustment finer than the number of electrode plate elements can be performed.

  In the above example, the number of divisions of the electrode plate 13 is 16. However, the number of divisions may be four if only the four sides of the display image need to be along the vertical and vertical directions. In that case, the electrode plate 13 is divided at a position inclined by 45 ° with respect to the horizontal line as shown in FIG. 14 (a), or in the horizontal and vertical directions as shown in FIG. 14 (b). It is desirable to divide. Moreover, the division | segmentation number of the electrode plate 13 may be set to 2 by making the internal shape of the inclination sensor part 10 like FIG. When the number of divisions is 4 or 2, when the required system is satisfied with rough angle adjustment, it can be handled by simple processing and can be handled at low cost.

  Further, in the tilt sensor unit 10, the one that plays a role of short-circuiting the electrode plate 12 and the electrode plate 13 is a sphere 14 made of a conductor as long as the inside can be freely moved in accordance with the tilt of the X-ray sensor. It does not have to be. Further, instead of the sphere 14 made of a conductor, it may not be a solid such as a liquid (such as mercury) that conducts electricity. Thereby, since an electrical contact can be electrically connected not as a point but as a surface, the connection state is stabilized.

  Further, the table 15 and the table 16 may be combined, and the positional relationship may be directly obtained from the number of the input terminal P. Thereby, a process step can be shortened, a process can be simplified, and a process can be performed more rapidly.

  Alternatively, instead of using the table 17, a basic angle of −22.5 degrees may be set, and the image rotation angle may be obtained by multiplying −22.5 degrees by a numerical value indicating a positional relationship. Thereby, a process step can be shortened, a process can be simplified, and a process can be performed more rapidly.

Further, the tilt detection unit 7 may be configured as described below.
FIG. 37 is a view showing another structure of the tilt sensor unit 10. (A) is sectional drawing which passes along an axial center, (b) is a front view orthogonal to an axial center. 4 is different from the structure of the tilt sensor unit 10 in that the electrode plate 29 arranged along the inner periphery of the inner surface of the tilt sensor unit 10 is a continuous metal whose resistance value per unit is known. There is a point.
FIG. 38 is a circuit diagram showing an outline of the function of the tilt sensor unit 10 shown in FIG. In FIG. 38, A indicates the electrode plate 12, B indicates one end of the electrode plate 29, and one end thereof is connected to the voltage + V, and the other end is in a floating state. C shows a location where the electrode plate 12 and the electrode plate 29 are short-circuited by the sphere 14 made of a conductor.
As shown in FIG. 38, the tilt sensor unit 10 becomes a variable resistor, and the resistance value between B and A is changed by changing the location where the electrode plate 12 and the electrode plate 29 are short-circuited by the sphere 14 made of a conductor. Changes. Since the resistance value corresponds to the short-circuited portion, the short-circuited portion can be obtained by flowing a current between B and A and obtaining the resistance value between B and A. Therefore, it is calculated | required that the X-ray sensor 3 is the arrangement | positioning state from which the calculated | required short circuit location becomes the lowest vertical part.
In addition, the tilt detection unit 7 may be configured to be fixed to the back surface of the X-ray sensor 3 and to have a rubber cap or the like so as to be detachable from the X-ray sensor 3.

  As described above, according to the first embodiment, the inclination detection unit 7 obtains information regarding the inclination of the X-ray sensor 3, the arrangement deriving unit 8 obtains the arrangement state of the X-ray sensor 3, and the image adjustment unit 9. Thus, by rotating the image data by an angle corresponding to the arrangement state to create a display image, the direction of the teeth in the display image can be made the same as that of the tooth as the subject.

<Second Embodiment>
An image processing apparatus according to the second embodiment of the present invention will be described with reference to FIGS. 16, 17 to 20, and 29 to 36.
FIG. 16 is a block diagram showing a configuration of an image processing apparatus according to the second embodiment of the present invention. In the second embodiment shown in FIG. 16, the same reference numerals as those in the first embodiment shown in FIG. 1 denote the same components, and a detailed description thereof will be omitted. The new configuration includes a clock generation unit 20 that generates a clock and an X-ray irradiation detection unit 21 that detects whether or not X-rays are being irradiated. The tilt detection unit 7 detects the tilt of the X-ray sensor 3. Each time a clock from the clock generation unit 20 is input, a signal corresponding to the inclination is output, and the arrangement deriving unit 8 indicates that the signal from the X-ray irradiation detection unit 21 is being irradiated with X-rays. During this time, every time a clock from the clock generator 20 is input, a signal from the inclination detector 7 is acquired, the arrangement state of the X-ray sensor 3 is obtained from the plurality of acquired signals, and a signal indicating the arrangement state is output. It is made to do.
The configuration and operation of the X-ray irradiation detection unit 21 will be described.

FIG. 29 is a block diagram illustrating the configuration of the X-ray irradiation detection unit 21.
The X-ray irradiation detection unit 21 includes an X-ray sensitive unit 27 and an irradiation detection signal generation unit 28. The X-ray sensitive unit 27 includes a phosphor 25 that converts X-rays into light and a photodiode 26 that generates charges by receiving light. When the X-rays are irradiated, the X-ray sensitive unit 27 has an amount proportional to the intensity of the irradiated X-rays. Outputs charge. The irradiation detection signal generation unit 28 receives the charge output from the X-ray sensitive unit 27, outputs a LOW level signal when there is no charge generated by irradiation, and HIGH level when there is charge generated by irradiation. It has a function to output the signal.
The X-ray sensitive unit 27 is installed inside the housing of the X-ray sensor 3 and at a position that does not prevent X-rays from irradiating the receiving X-ray unit of the X-ray sensor, and is disposed in the oral cavity together with the X-ray sensor 3. In response to the irradiation of the X-rays generated from the X-ray generator 2, the charges generated by the X-ray irradiation are output.
The installation position of the X-ray sensitive unit 27 inside the housing of the X-ray sensor 3 may be any position as long as the X-rays do not prevent the X-ray sensor 3 from receiving the X-ray receiving unit. Desirably, a position where X-rays do not interfere with irradiation of the phosphor 25 of the X-ray sensitive unit 27 is good.

FIG. 30 shows an example of the installation position of the X-ray sensitive unit 27 inside the housing of the X-ray sensor 3.
In FIG. 30, the X-ray sensitive unit 27 is installed on the cable drawing side inside the housing of the X-ray sensor 3.

FIG. 31 is a diagram showing the installation position of the irradiation detection signal generator 28.
The irradiation detection signal generation unit 28 must be installed at a position that does not prevent the X-ray incident on the X-ray receiving unit and the X-ray sensitive unit 27 of the X-ray sensor 3. 3 is fixed to a place located on the side or back side.
Here, the operation of the X-ray irradiation detection unit 21 will be described.
First, when the X-ray from the X-ray generator 2 is irradiated onto the X-ray sensitive unit 27, the phosphor 25 of the X-ray sensitive unit 27 emits light. The generated light is received by the photodiode 26, and charges are generated and output.

FIG. 32 shows the relationship between X-ray irradiation and the change in the output of the photodiode 26. Before the X-ray irradiation, the output of the photodiode 26 is 0 or a constant value. When X-rays are irradiated, the output of the photodiode 26 increases. When the X-ray irradiation is stopped, the same output as before the X-ray irradiation is obtained.
Next, the irradiation detection signal generator 28 evaluates the output of the photodiode 26 to determine whether X-rays are being irradiated or not, and when the X-rays are being irradiated, a HIGH level signal. When the X-ray is not being irradiated, a LOW level signal is output.

  FIG. 33 shows the relationship between the output of the photodiode 26 and the output of the irradiation detection signal generator 28. When X-ray irradiation is started, the output of the photodiode 26 increases from the non-irradiation state. As a result, the output of the irradiation detection signal generator 28 changes from the LOW level to the HIGH level. When the X-ray irradiation is stopped, the output of the photodiode 26 returns to the non-irradiation state, whereby the output of the irradiation detection signal generating unit 28 changes from HIGH level to LOW level. As a result, the output of the X-ray irradiation detection unit 21 is HIGH during X-ray irradiation, and is LOW when X-ray irradiation is not being performed.

FIG. 34 is a schematic diagram showing an example of the system configuration of an image processing apparatus according to the second embodiment of the present invention.
The image processing apparatus shown in FIG. 34 includes an X-ray sensor 3, an inclination detection unit 7, an X-ray irradiation detection unit 21 including an X-ray sensing unit 27 and an irradiation detection signal generation unit 28 inside the X sensor 3, and an internal sensor. The unit 4 includes a control unit 4, an image processing unit 6, an arrangement deriving unit 8, and an image adjustment unit 9, and a display 23 for displaying an image.

  As shown in FIG. 36, the X-ray sensitive unit 27 may be divided into two to three or more and installed inside the housing of the X-ray sensor 3. In this way, when the X-ray sensitive unit 27 is divided into a plurality of parts, the irradiation detection signal generation unit 28 receives the outputs from the plurality of photodiodes 26 and any one of the inputs indicates the presence of the charge generated by the irradiation. Sometimes a HIGH level signal is output. If there is one X-ray sensitive part 27, it cannot be detected when it is shielded, but there are a plurality of X-ray sensitive parts 27, so that X-ray irradiation can be reliably obtained.

In addition, when the X-ray sensitive unit 27 is divided into a plurality of parts, the outputs of the plurality of photodiodes 26 are added to form one output, and the irradiation detection signal generation unit 28 receives the one output as an input, and outputs the irradiation detection signal. You may make it output. By doing in this way, a trace amount X-ray irradiation can be detected.
Note that the irradiation detection signal generation unit 28 may be installed inside the housing of the X-ray sensor 3.

Further, the irradiation detection signal generator 28 may be installed inside the unit box 22.
Note that the X-ray sensitive unit 27 may be tightly fixed to the outside of the side wall of the housing of the X-ray sensor 3 and may be disposed in the oral cavity together with the X-ray sensor 3.

Further, the X-ray sensitive unit 27 may be fixed and disposed at a position of the X-ray generator 2 that is irradiated with the generated X-ray and is outside the X-ray irradiation range for irradiating the X-ray sensor 3.
The photodiode 26 does not exist separately from the sensor unit of the X-ray sensor 3, but may be incorporated in the same element as the sensor unit.
A CCD may be used in place of the photodiode 26 in the previous period.

Further, instead of the photodiode 26, a pixel other than an effective pixel which is a basis for generating image data in the X-ray sensor 3 may be used.
Note that the configuration of the X-ray sensitive unit 27 may not be provided with the phosphor 25 but may be configured solely by a CCD sensitive to X-rays.
Instead of providing the X-ray sensitive unit 27, the output of the X-ray sensor 3 is also used as an input of the irradiation detection signal generating unit 28, and the increase in the output of the X-ray sensor 3 due to the X-ray irradiation is monitored. The output of the irradiation detection signal generator 28 may be switched.
In FIGS. 34 and 35, the X-ray sensor 3, the tilt detection unit 7, the irradiation detection signal generation unit 28 constituting the X-ray irradiation detection unit 21, and the unit box 22 are transmitted via cables. However, the signal may be transmitted wirelessly.

  The second embodiment is different from the first embodiment in that the signal output from the inclination detection unit 7 is repeatedly transmitted in synchronization with the clock, and the arrangement deriving unit 8 uses the X-ray. While the signal from the irradiation detection unit 21 indicates that X-rays are being emitted, the signal from the inclination detection unit 7 is repeatedly acquired in synchronization with the clock, and the sensor arrangement state is determined from the plurality of acquired signals. This is the point that I asked for.

The operation of the image processing apparatus configured as described above will be described.
First, the X-ray sensor 3 is arranged to photograph the subject 1 in the oral cavity.
Next, X-rays are emitted from the X-ray generator 2, and a charge signal corresponding to the X-ray image of the subject 1 is generated in the X-ray sensor 3. Further, the X-ray irradiation detection unit 21 outputs a signal indicating that X-rays are not irradiated before X-rays are emitted from the X-ray generator 2, and X-rays are emitted from the X-ray generator 2. When irradiated, outputs a signal indicating that X-rays are being emitted, and outputs a signal indicating that X-rays are not being irradiated at the same time X-ray irradiation from the X-ray generator 2 is stopped. To do.

  Next, the sensor control unit 4 controls driving of the X-ray sensor 3 and causes the image processing unit 6 to output a charge signal generated in the X-ray sensor 3. The image processing unit 6 converts the charge signal output from the X-ray sensor 3 into digital data, and then aligns the digital data according to the number of pixels in the width direction and the height direction of the X-ray sensor 3, create.

On the other hand, the clock generation unit 20 continues to output the clock continuously.
The inclination detector 7 detects the inclination of the X-ray sensor 3 in the oral cavity, and sends a signal corresponding to the inclination to the arrangement deriving unit 8 every time a clock from the clock generator 20 is input.

  When the signal from the X-ray irradiation detection unit 21 indicates that X-rays are being emitted, the arrangement deriving unit 8 outputs the signal from the inclination detection unit 7 every time a clock is input from the clock generation unit 20. Obtaining and determining the arrangement state of the X-ray sensor 3 based on the obtained signals. The image adjustment unit 9 creates a display image by rotating the image data created by the image processing unit 6 according to the arrangement state of the X-ray sensor 3 obtained by the arrangement deriving unit 8.

In this process, differences from the first embodiment will be described in detail.
FIG. 17 is a diagram illustrating a state of a clock signal output from the clock generation unit 20. As shown in FIG. 17, the clock signal is switched between a LOW level and a HIGH level at regular intervals.

FIG. 18 is a circuit diagram for explaining the function of the inclination detector 7 in the second embodiment. A portion surrounded by a dotted line in FIG. 18 corresponds to the tilt sensor unit 10, the A end of each switch represents the electrode plate 12, the B end represents the electrode plate 13, and the switch represents the sphere 14 made of a conductor. In the tilt signal generator 11, there is an input terminal P corresponding to each electrode plate 13. There is also an output terminal Output that outputs a signal according to the input value of the input terminal P. The signal output from the output terminal Output is composed of a number of bits larger than the number of input terminals P, and each bit takes a value corresponding to the input value of the input terminal P assigned the same number as the bit number, At the moment when the signal from the clock generator 20 switches from the LOW level to the HIGH level, an output corresponding to the input value of the input terminal P at that time is performed.
Note that an output corresponding to the input value of the input terminal P at that time may be performed at the moment when the signal from the clock generation unit 20 is switched from the HIGH level to the LOW level.

Further, as shown in FIG. 33, the signal output from the X-ray irradiation detection unit 21 is a LOW level output when the X-ray is not being irradiated, and is a HIGH level output while the X-ray is being irradiated. The arrangement deriving unit 8 acquires the signal from the inclination detecting unit 7 while the signal from the X-ray irradiation detecting unit 21 is HIGH.
The signal output from the X-ray irradiation detection unit 21 is a HIGH level output when the X-ray is not being irradiated, and a LOW level output when the X-ray is being irradiated. While the signal from the X-ray irradiation detection unit 21 is LOW, the signal from the tilt detection unit 7 may be acquired.

Further, FIG. 19 is a diagram showing a flowchart of the operation for obtaining the arrangement state in the arrangement deriving unit 8.
First, the arrangement deriving unit 8 prepares an array in which the number of elements is the same as the number of input terminals P, and each input terminal P and each element have a one-to-one correspondence (step S201). Next, the values of all the elements of the prepared array are set to 0 (step S202).

  Next, it is calculated | required by the signal from the X-ray irradiation detection part 21 whether X-rays are being irradiated (step S203). If X-rays are not being irradiated, it is determined again whether X-rays are being irradiated. If X-rays are being irradiated, the process proceeds to step S204. In step S204, one signal is received from the inclination detector 7 in synchronization with the clock.

Next, the number of the input terminal P corresponding to the signal is obtained (step S205), and the value of the element of the array corresponding to the input terminal P having the obtained number is increased by 1 (step S206).
Next, it is calculated | required from the signal from the X-ray irradiation detection part 21 whether X-ray | X_line is irradiating (step S207). If X-rays are being irradiated, the process returns to step S204 and continues. If X-rays are not being irradiated, the process proceeds to step S208.

  In step S208, the number of the electrode plate 13 that seems to be at the lowest position in the vertical direction is determined from the value of the element in the array. Finally, the positional relationship between the obtained electrode plate 13 and the reference electrode plate 13 is obtained (step S209).

  In this flowchart, it is desirable that the time interval until the process proceeds to step S204 and then the process of step S204 is within one cycle of the clock generated by the clock generator 20.

Next, an outline of a method of obtaining the number of the electrode plate 13 that is considered to be vertically lowermost from the element values of the array in step S208 of the flowchart shown in FIG. 19 will be described.
FIG. 20 shows the values of array elements in a histogram.
As shown in the histogram of FIG. 20, the reason why the values of the plurality of elements are 1 or more is mainly because the person shakes during X-ray irradiation. When a person shakes, the relative positional relationship between the X-ray sensor 3 and the teeth does not change, but the face itself shakes, so that the sphere 14 due to the conductor in the tilt sensor unit 10 moves and outputs from the tilt detection unit 7. Will change. In addition, when the vibration has a component in a direction parallel to the mounting surface of the X-ray sensor 3, the change in output is greatly affected.

  There are two main ways to shake people. One is basically a stationary state but sometimes swings, and the other is a case where it continues to swing at a constant period. Basically, when it is in a stationary state but occasionally shakes, it becomes a histogram having a mountain shape in which the value of a certain number shown in FIG. Further, in the case of continuing to swing at a constant cycle, a histogram in which several adjacent numbers shown in FIG. 20B have almost the same value is obtained.

  In the case of the histogram as shown in FIG. 20A, the number of the electrode plate 13 corresponding to the input terminal P having the peak number is used. Further, in the case of a histogram as shown in FIG. 20B, a range of numbers having substantially the same value is obtained and set as the number of the electrode plate 13 corresponding to the input terminal P having the middle number.

  Note that the clock from the clock generation unit 20 is sent only to the arrangement deriving unit 8, and the inclination detecting unit 7 continues to output a signal corresponding to the position of the sphere 14 by the conductor at any time regardless of the clock, and the arrangement deriving unit. 8, the signal from the inclination detector 7 may be acquired only when the clock from the clock generator 20 is input. Thereby, simplification of the circuit of the inclination detection part 7 can be achieved.

  Further, the signal of the X-ray irradiation detection unit 21 is sent not to the arrangement deriving unit 8 but to the inclination detection unit 7, and the signal indicating the inclination only when the signal from the X-ray irradiation detection unit 21 is HIGH in the inclination detection unit 7. May be sent to the arrangement deriving unit 8. Thereby, the circuit of the arrangement | positioning derivation | leading-out part 8 can be simplified.

  Further, the X-ray irradiation detection unit 21 may detect X-ray irradiation by monitoring the current value applied to the X-ray tube in the X-ray generator, instead of monitoring the X-ray irradiation itself. .

  As described above, according to the second embodiment, the clock generation unit 20 and the X-ray irradiation detection unit 21 are provided, and the output of the inclination detection unit 7 is acquired a plurality of times, thereby obtaining the arrangement state. Even if the output of the tilt detection unit 7 temporarily becomes unsuitable due to a person's shaking or the like, the direction of the teeth in the display image can be made the same as that of the tooth as the subject.

  In the image processing apparatus of the present invention, the inclination detection unit 7 obtains information related to the inclination of the X-ray sensor 3, the arrangement derivation unit 8 obtains the arrangement state of the X-ray sensor 3, and the image adjustment unit 9 determines the angle corresponding to the arrangement state. By rotating the partial image data and creating a display image, the direction of the tooth in the display image can be made the same as that of the tooth as the subject without any manual operation. It is easy to associate the tooth with the tooth that is the subject, which is useful in dental diagnosis.

1 is a block diagram showing a configuration of an image processing apparatus according to a first embodiment of the present invention. The figure which shows the structure of the X-ray sensor of FIG. 1, and an inclination detection part. The figure which shows the structure of the inclination detection part of FIG. FIG. 3 is a diagram showing the structure of the tilt sensor unit in FIG. 3. (A) A cross-sectional view passing through the central axis of the counter electrode plate in the casing of the tilt sensor unit 10 (b) Orthogonal front view Circuit diagram for explaining the operation of the tilt detection unit of FIG. The figure for demonstrating the process in which the output signal of the inclination signal generation part 11 is determined. Flowchart explaining operation of arrangement deriving unit The figure which shows a response | compatibility with the input terminal P of the inclination detection part 7, and the electrode plate 13. FIG. The figure which shows the structure of the table which shows the positional relationship of the electrode plate 13 used as a reference | standard, and another electrode plate The flowchart explaining operation | movement of the image adjustment part of FIG. The figure which shows the structure of the table which shows the image rotation angle which arrangement | positioning information respond | corresponds The figure which shows the structure of the table which shows the default rotation angle which each electrode plate 13 respond | corresponds. The figure which shows the structure of the table which shows the electrode plate 13 used as a reference | standard The figure which shows the example of the division | segmentation and arrangement | positioning of the electrode plate 13 (a) The figure which inclines and divides 45 degrees with respect to the horizontal time (b) The figure which divides | segments in a horizontal direction and a perpendicular direction The figure which shows the example of the division | segmentation and arrangement | positioning of the electrode plate 13 (a) The figure divided | segmented in a horizontal direction (b) The figure divided | segmented in a vertical direction The block diagram which shows the structure of the image processing apparatus which concerns on the 2nd Embodiment of this invention. The figure explaining the state of the clock which the clock generation part of FIG. 16 transmits The figure explaining the function of the inclination detection part of FIG. FIG. 16 is a flowchart for explaining the operation of the arrangement deriving unit. The figure which shows the example of the histogram produced by the arrangement | positioning derivation | leading-out part of FIG. The figure which shows the whole structure in the conventional image processing apparatus. The figure which shows the positional relationship of a tooth | gear and an X-ray sensor when arrange | positioning an X-ray sensor in the intraoral left upper jaw (a) The figure arrange | positioned so that a cable may extend below toward imaging | photography object (b) On imaging | photography object Figure arranged so that the cable extends to the left The figure which shows the positional relationship of a tooth | gear and an X-ray sensor when arrange | positioning an X-ray sensor in the right lower jaw in an intraoral area (a) The figure arrange | positioned so that a cable may extend upwards toward imaging | photography object (b) Figure arranged so that the cable extends to the right Figures showing examples of display images (a) Left upper jaw image (b) Right lower jaw image A figure showing an example of a photographed image of the 10-frame method A diagram showing an example of a captured image of the 14-frame method The figure which shows the system configuration | structure of the image processing apparatus which concerns on the 1st Embodiment of this invention. The figure which shows the system configuration | structure of the image processing apparatus which concerns on the 1st Embodiment of this invention different from FIG. The block diagram which shows the structure of the X-ray irradiation detection part of FIG. The figure which shows the example of the installation position in the housing | casing of the X-ray sensor of the X-ray sensitive part of FIG. The figure which shows the installation position of the irradiation detection signal generation part of FIG. The figure which shows the change of the output of the photodiode of FIG. The figure which shows the relationship between the output of the photodiode of FIG. 29, and the output of an irradiation detection signal generation part. Schematic diagram showing the system configuration of an image processing apparatus according to a second embodiment of the present invention The figure which shows the system configuration | structure of the image processing apparatus which concerns on the 1st Embodiment of this invention different from FIG. The figure which shows the example of the installation position in the housing | casing of the X-ray sensor of the X-ray sensitive part of FIG. 30 different from FIG. The figure which shows the structure of the inclination sensor part different from FIG. 4 (a) Sectional drawing which passes along an axial center (b) Front view orthogonal to an axial center FIG. 37 is a circuit diagram showing the function of the tilt sensor unit of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Subject 2 X-ray generator 3 X-ray sensor 4 Sensor control part 6 Image processing part 7 Tilt detection part 8 Arrangement deriving part 9 Image adjustment part 10 Tilt sensor part 11 Tilt signal generation part 12, 13, 29 Electrode plate 14 Conductor 15 A table indicating the correspondence between the input terminal P of the tilt detection unit 7 and the electrode plate 13 16 A table indicating the positional relationship between the reference electrode plate 13 and another electrode plate 17 The image rotation angle corresponding to the arrangement information Table 18 Table showing the default rotation angle to which each electrode plate 13 corresponds 19 Table showing the electrode plate 13 serving as a reference 20 Clock generation unit 21 X-ray irradiation detection unit 22 Unit box 23 Display 24 Computer 25 Phosphor 26 Photodiode 27 X-ray sensitive part 28 Irradiation detection signal generator

Claims (3)

An image processing device for obtaining images of teeth and jawbones by X-rays,
An X-ray sensor that is placed in the oral cavity and accumulates charges according to the X-ray image of the subject;
A sensor control unit for controlling driving of the X-ray sensor;
The charge signal output from the X-ray sensor is converted into digital data, and the converted digital data is processed according to the number of pixels in the width direction and height direction of the X-ray sensor to create image data An image processing unit to
An inclination detector that detects the inclination of the X-ray sensor and outputs a signal corresponding to the inclination;
An arrangement deriving unit for obtaining an arrangement state of the X-ray sensor from an output signal of the inclination detection unit and outputting a signal indicating the arrangement state;
An image adjusting unit that adjusts the orientation of image data from the image processing unit based on the arrangement state indicated by the arrangement deriving unit ;
A clock generator for generating a clock;
An X-ray irradiation detection unit that detects whether or not X-rays are being irradiated;
The tilt detection unit outputs a tilt detection signal in synchronization with the clock from the clock generation unit,
While the signal from the X-ray irradiation detection unit indicates that X-ray irradiation is being performed, the arrangement deriving unit synchronizes with the clock from the clock generation unit and detects the tilt detection signal from the tilt detection unit. Is repeatedly acquired, and the image processing apparatus is configured to obtain the arrangement state of the X-ray sensor from the acquired plurality of inclination detection signals . The tilt detection unit is disposed along the inner periphery of the inner surface of the casing, facing the upper and lower sides of the inner surface of the casing, and individually numbered to identify the other electrode plate elements. A plurality of electrode plate elements, and a conductor that can move freely inside the housing, and move in contact with any one of the electrode plate elements and short circuit with any one of the counter electrode plates to generate an energized state. The image processing apparatus according to claim 1, further comprising a body. The tilt detection unit is made of a counter electrode plate disposed above and below the inner surface of the housing, and a metal having a known resistance value per unit length disposed continuously along the inner periphery of the inner surface of the housing. An electrode plate element and a conductor that can move freely inside the housing, and is in contact with any of the electrode plate elements disposed along the inner periphery of the inner surface of the housing and with any of the counter electrode plates The image processing apparatus according to claim 1 , further comprising a moving body that is brought into contact with and short-circuited to generate an energized state.