JP6674924B2 - Bone density measurement device and control method - Google Patents

Description

  The present invention relates to a bone density measuring device, and more particularly, to a mechanism for appropriately positioning a forearm on a mounting surface.

  A bone density measuring device is a device that measures bone density (bone mineral density) using X-rays. The forearm is mentioned as a site where the bone density is measured, and specifically, a radius or the like in the forearm is mentioned. The forearm bone density measurement device generally has a measurement groove (measurement space, accommodation space) into which the forearm is inserted. An X-ray generator is provided on one side of the measurement groove, and an X-ray detector is provided on the other side of the measurement groove. X-rays from the X-ray generator are emitted to the forearm, and X-rays transmitted through the forearm are detected by the X-ray detector. Based on the X-ray detection data obtained thereby, the bone density distribution is calculated according to the DEXA (Dual Energy X-ray Absorptiometry) method. If necessary, the bone density measuring device is supported by a supporting device. The bone density measurement system includes a bone density measurement device and a support device.

  Patent Literature 1 discloses a conventional bone density measurement system. The system includes a bone density measuring device having a measurement groove, and a leg supporting the bone density measuring device. In the bone density measurement device, a measurement groove is formed in parallel with the bottom surface. On the other hand, the upper surface of the leg is inclined, and the bone density measuring device is installed on the upper surface. As a result, a tilt attitude of the measurement groove occurs. Then the forearm is inserted into the measuring groove. A mechanism for assisting bone density measurement is provided in the measurement groove. The mechanism includes a removable grip and a pair of elbow pads. The detachable grip is attached to an unused elbow pad. The elbow pad is a member provided so as to be able to slide, and is for measuring the length of the forearm.

  Patent Document 2 discloses a bone density measurement system similar to the above. Patent Document 3 discloses a bone density measurement device provided with an X-ray marker. Patent Literature 4 discloses a bone mineral density measurement device capable of changing the position of a table on which a test site is placed.

JP 2008-22960 A JP 2008-22958 A JP 2009-106425 A Japanese Patent Publication No. 2008-44439

  When measuring the bone density of the forearm, it is necessary to appropriately position the forearm with respect to the X-ray irradiation area. Further, it is necessary to prevent the forearm from easily moving during the measurement. From such a background, the detachable single grip is used in the bone density measurement device disclosed in Patent Document 1. At the time of measuring the right arm, the grip is attached to the unused left elbow pad, and at the time of measuring the left arm, the grip is attached to the unused right elbow pad. However, in such a configuration, problems such as poor mounting of the grip, dropping, and loss are likely to occur.

  An object of the present invention is to prevent problems such as improper mounting, dropping, and loss of a grip in a bone density measuring device. Alternatively, it is an object of the invention to avoid problems due to unused grip. Alternatively, it is an object of the invention to structurally strengthen the grip when in use. Alternatively, an object of the present invention is to increase safety in measuring bone density.

  (1) The bone density measuring device according to the embodiment has a first grip that is in an operating posture when measuring the right arm and is in a retracted posture when measuring the left arm, and is in an operating posture when measuring the left arm and is in a retracted posture when measuring the right arm. And a second grip.

  According to the above configuration, since the first grip for the right arm and the second grip for the left arm are provided, it is not necessary to attach or detach the grip according to the measurement target. As a result, problems such as improper mounting, dropping, and loss do not occur. Since each of the grips selectively takes the operating posture and the retracted posture, the function can be surely exhibited during use, and does not hinder when not in use. Each grip is a member that is gripped by the hand of the forearm that has been measured.

  In the embodiment, the bone density measurement device further includes a mounting surface on which the arm to be measured is mounted, and each of the operating postures is such that each of the grips falls down toward the mounting surface. The respective retracted postures are the postures that occur when the grips are separated from the mounting surface. According to this configuration, the operating posture can be easily formed by rotation of the grip or the like. The grip in the operating position is gripped by the subject. The evacuation position is a non-operation position. In the embodiment, each of the evacuation postures is a standing posture. According to this configuration, the falling posture is formed by the rotation of the grip in one direction, and the standing posture is formed by the rotation of the grip in the other direction. Note that a posture other than the falling posture may be employed as the operating posture, and a posture other than the standing posture may be employed as the evacuation posture.

  In the embodiment, the bone density measurement device further includes a right arm measurement slide member including a right elbow rest that is brought into contact with the right elbow during the right arm measurement, and is brought into contact with the left elbow during the left arm measurement. A left arm measurement slide member provided with a left elbow pad, wherein the first grip and the left elbow pad are in a first engagement state in the operating position of the first grip, and the operating position of the second grip is In the above, the second grip and the right elbow rest are in a second engagement state. The engaged state can be said to be a united state. If an engagement state is formed, the grip can be structurally strengthened. This is an advantageous advantage in positioning the forearm. Each slide member, in embodiments, is configured as an assembly including a rod, an elbow pad, and the like.

  In the embodiment, a slit is formed in each grip, and each of the engagement states is a state in which each of the elbow pads is accommodated in each of the slits. According to this configuration, the engagement state can be easily formed by rotation of the grip or the like.

  In the embodiment, the bone density measurement device further allows a posture change due to the first grip falling down when the first engagement state can be formed, and otherwise, the posture due to the first grip falling down. A first regulating mechanism that regulates a change, and a posture change due to a fall of the second grip is allowed when the second engagement state can be formed; otherwise, a posture change due to a fall of the second grip is allowed. And a second regulating mechanism for regulating.

  According to this configuration, in a situation where the engagement state cannot be formed, it is possible to prevent the grip from inadvertently falling down. Since it is urged to return the elbow rest which is not used at the time of measurement (that is, the unused slide member) to the home position, it is possible to prevent the elbow rest from being carelessly moved during the measurement.

  In the embodiment, the bone density measurement device is further an X-ray attenuation member that slides in conjunction with the slide movement of the right arm measurement slide member, and a right arm measurement marker protruding into the X-ray irradiation space, An X-ray attenuating member that slides in conjunction with the sliding movement of the left arm measuring slide member, and includes a left arm measuring marker that protrudes into the X-ray irradiation space. According to this configuration, the position of the marker can be specified based on the X-ray detection data, and the sliding amount of the slide member can be specified from the position of the marker. It is not necessary to provide an encoder or the like for measuring the slide amount.

  In the embodiment, the bone density measurement device further calculates the position of the right arm measurement marker based on the X-ray detection data during the right arm measurement, and calculates the left arm measurement marker based on the X-ray detection data during the left arm measurement. And a marker position calculating unit that calculates the position of the right arm, and calculates the bone density measurement site for the right arm based on the position of the marker for measuring the right arm during the measurement of the right arm, and calculates the left arm based on the position of the marker for measuring the left arm during the measurement of the left arm. A measurement site calculation unit that calculates a bone density measurement site for use. According to this configuration, the marker position is calculated based on the X-ray detection data, and the bone density measurement site is calculated based on the marker position.

  In the embodiment, the bone density measuring device further includes a first detector for detecting a posture of the first grip, a second detector for detecting a posture of the second grip, and a detection result of the first detector. And a control unit for controlling the operation of the device based on the detection result of the second detector. According to this configuration, the device operation is controlled based on the posture of each grip. If the combination of the two postures is not normal, error processing may be executed.

  In an embodiment, the control unit is configured to: X when both the first grip and the second grip are in the operating posture and when both the first grip and the second grip are in the retracted posture. Inhibit radiation. According to this configuration, safety can be improved.

  (2) The control method according to the embodiment includes a step of detecting a posture of the first grip gripped when measuring the right arm, a step of detecting a posture of the second grip gripped when measuring the left arm, and a step of detecting the posture of the first grip. Controlling the operation of the bone density measuring device based on the posture and the posture of the second grip.

  In the embodiment, in the step of controlling the operation, when one of the first grip and the second grip is in an operating posture and the other is in a retracting posture, X-ray irradiation is allowed, and In this case, X-ray irradiation is prohibited. According to this configuration, X-ray irradiation is allowed only when the combination of the two postures is normal, so that safety can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, in a bone density measuring device, problems, such as poor mounting of a grip, a fall, and a loss, do not arise. Alternatively, according to the present invention, it is possible to prevent a problem from occurring due to an unused grip. Alternatively, according to the present invention, the grip can be structurally strengthened during use. Alternatively, according to the present invention, safety in bone density measurement can be enhanced.

It is a perspective view showing a bone density measuring system concerning an embodiment. It is another perspective view showing the bone density measuring system concerning an embodiment. It is a perspective view showing the bone density measuring device concerning an embodiment. It is a side view showing the bone density measuring device concerning an embodiment. It is a figure for explaining the change of the height of a measurement groove. It is a perspective view showing the truck concerning an embodiment. It is a figure showing operation at the time of setting a rising edge height. It is a figure which shows stepwise change of a rising edge height. It is a figure showing the example of composition of a restriction mechanism. It is a figure which shows the relationship between a handle and a lever. It is sectional drawing which shows a lock release mechanism. FIG. 1 is a diagram showing a bone density measurement system and a wheelchair in proximity thereto. It is a schematic sectional drawing of a bone density measuring device. It is a top view which shows a measurement assistance mechanism. It is a top view which shows the state in which the forearm was mounted on the mounting surface. It is a perspective view which shows a measurement assistance mechanism. It is a figure showing a grip in a fall state. It is a figure showing a grip in an upright state. It is a figure showing composition of an assembly for right arms. It is a figure showing a regulation state. It is a figure showing an unregulated state. It is a figure showing the example of arrangement of a sensor. It is a block diagram showing a bone density measuring device. It is a figure which shows the judgment and control according to two grip states. FIG. 4 is a diagram illustrating a positional relationship between a fan beam and a marker. It is a figure which shows an X-ray transmission image and an average value profile. It is a flowchart which shows a bone density measurement process. It is a flowchart which shows the control example of a bone density measuring device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1) Bone Density Measurement System and Bone Density Measurement Device FIG. 1 shows a bone density measurement system 10 according to an embodiment. The bone density measurement system 10 is a medical device that measures the bone density (bone mineral density) of a subject in a medical institution such as a hospital. Bone density is calculated based on the DEXA method. The site to be measured is the forearm of the subject, and more specifically, the radius in the forearm. The ulna or other bone may be measured.

  The bone density measurement system 10 includes a bone density measurement device 12 and a cart 14 as a support device. The bone density measuring device 12 may be used alone, or the bone density measuring device 12 may be mounted on another supporting device. The bone density measuring device 12 has a measurement groove 18 having an inclined posture (obliquely upward posture). The forearm (right forearm or left forearm) is inserted into the measurement groove 18. The measurement groove 18 has a front opening, a right opening, and a left opening.

  In FIG. 1, the X direction is the front-back direction or the depth direction. The Y direction is the left-right direction. The Z direction is a vertical (vertical) direction. In the X direction, the side closer to the subject is the near side, and the side farther from the subject is the far side. The front opening of the measurement groove 18 is an opening opened to the near side. FIG. 2 shows the back side of the bone density measurement system 10.

  FIG. 3 shows only the bone density measuring device 12. The bone density measuring device 12 has a housing 16 as a housing. The housing 16 is roughly divided into a lower part 20, an upper part 22, and an intermediate part 24. The measurement groove 18 is formed between the lower part 20 and the upper part 22. The bottom surface of the measurement groove 18 (that is, the upper surface of the lower portion 20) forms the mounting surface 26. A measurement assist mechanism 28 is provided in the measurement groove 18. The details will be described later.

  FIG. 4 shows a schematic side view of the bone density measuring device. The above-described measurement assist mechanism is not shown. As described above, the housing includes the lower part 20, the upper part 22, and the intermediate part 24. The lower part 20 comprises a front part 30 and a rear part 32. An X-ray generator is provided in the front part 30. The front portion 30 will be referred to as the lower hollow structure 30. The upper part 22 includes a front part 34 and a rear part 36. An X-ray detector is provided in the front portion 34. The front portion 34 will be referred to as the upper hollow structure 34. The intermediate portion 24 is formed between the rear portion 32 of the lower portion 20 and the rear portion 36 of the upper portion 22.

  The measurement groove 18 is formed between the lower hollow structure 30 and the upper hollow structure 34. The measurement groove 18 has an inclined posture (obliquely upward posture). The lower part 20 has a bottom surface 37A as a horizontal plane. The measurement groove 18 is inclined with respect to the bottom surface 37A. The bottom surface of the measurement groove 18, that is, the upper surface of the lower hollow structure 30 constitutes a mounting surface 26, and the mounting surface 26 is lowered from the near side to the far side, and is an inclined surface. The thickness of the lower hollow structure 30 in the vertical direction (Z direction) gradually decreases from the near side to the far side (along the X direction). For example, the thickness T2 on the back side is smaller than the thickness T1 on the front side. Incidentally, the thickness T1 is defined as a distance from a surface 37B obtained by extending the bottom surface 37A in the horizontal direction to the mounting surface 26.

  As described above, in the bone density measurement device of the present embodiment, the measurement groove 18 having a tilted posture in a natural state is configured. Therefore, if the bone density measuring device is installed on a horizontal pedestal, the inclination of the measurement groove 18 naturally occurs. The bone densitometer does not need to be installed on a special leg with an inclined mounting surface. Since the measurement groove 18 has an obliquely upward attitude, the forearm can be naturally guided to the far side of the measurement groove 18 when the forearm is placed on the mounting surface 26. The lower surface of the upper hollow structure 34 constitutes a ceiling surface 38 facing the mounting surface 26. The mounting surface 26 and the ceiling surface 38 are parallel. The internal structure of the bone density measuring device will be described later in detail.

(2) Truck FIG. 5 shows the operation of the support mechanism (elevating mechanism) 40 provided on the truck 14. A state where the height of the bone density measuring device 12 is lowered is indicated by reference numeral 10A. A state where the height of the bone density measuring device 12 is increased is indicated by reference numeral 10B. In any case, the inclination angle θ1 of the measurement groove is the same. That is, even if the bone density measuring device 12 is moved up and down, the inclination posture of the measurement groove is unchanged. Incidentally, θ1 is set within a range of, for example, 6 degrees to 14 degrees, and is, for example, 10 degrees. The carriage 14 has a support mechanism 40. The support mechanism 40 includes a fixed column 42 as a fixed member, and a movable column 44 also as a vertically movable member. The movable column 44 is held by the fixed column 42 so as to be able to move up and down.

  The cart will be described in more detail with reference to FIG. The cart has a pedestal 46, a support mechanism 40, and legs 49. The pedestal 46 has a pedestal surface as a horizontal surface, on which the bone density measuring device is mounted. The support mechanism 40 includes a fixed column 42, a movable column 44, and a gas spring 50. The gas spring 50 is provided in the fixed column 42 and the movable column 44 so as to straddle them. The lower end of the fixed column 42 is fixed to the leg 49, and the movable column 44 is held by the fixed column 42 so as to be able to move up and down. The upper end of the movable column 44 is connected to a pedestal 46. The leg 49 includes four casters 51 that can pivot.

  The gas spring 50 functions as a push-up mechanism that exerts an upward push force on the pedestal 46. Specifically, the gas spring 50 has a lock function (unlock function). In the locked state, the entire length of the gas spring 50 is held, and in the unlocked state, an upward pushing force is exerted. . In the present embodiment, in the entire stroke range of the pedestal 46, the total load (force from above) and the push-up force (from below) of the movable part at a height corresponding to approximately 80% from the lowest height (base height). The force of the gas spring 50 is adjusted so that the force of the gas spring 50 is balanced. Here, the movable portion is the entire portion that moves up and down, and the total load includes the load of the bone density measuring device, the load of the pedestal 46, and the load of the movable column 44. Further, a load on the subject such as the forearm may be considered.

  It is also possible to set or adjust the balance so that the balance is established at the highest point or the middle point of the entire stroke range. As will be described later, the gas spring 50 has a cylinder and a shaft, and an elastic force for pushing the shaft is generated by the pressure of gas in the cylinder. A pin urged forward is provided at the tip of the shaft body. A locked state is formed with the pin protruding, and an unlocked state is formed by pushing the pin back.

  The pedestal 46 has four handles 54a, 54b, 54c, 54d that spread in the horizontal direction. They are formed around the pedestal surface, and project outward from the bone density measurement device and are exposed when the bone density measurement device is mounted. The pedestal 46 is provided with a lock release mechanism 52. The lock release mechanism 52 has arms 56a and 56b and levers 58a and 58b. The details of the lock release mechanism 52 will be described later. There is a lever 58a below the handle 54a, and when the lever 58a is pulled up, the lever 58a comes close to the handle 54a, and when they are viewed from above, they overlap. Similarly, there is a lever 58b below the handle 54b, and when the lever 58b is pulled up, the lever 58b comes close to the handle 54b, and when they are viewed from above, they overlap. With such a configuration, the palms are simultaneously applied to the handles 54a and 54b while the levers 58a and 58b are raised (unlocked) with the fingers of the hands, and the weight is applied to them. Becomes possible.

  The support mechanism 40 includes a restriction mechanism 48. The limiting mechanism 48 is a mechanism that, when a rising edge height is selected from a plurality of (three in this embodiment) rising edge height candidates, a rising motion exceeding the rising edge height. Here, the rising end height is about the pedestal 46 (especially the pedestal surface). However, since the pedestal 46 and the bone density measuring device move up and down integrally, the rising end height is determined by the bone density measuring device or It is also about the measurement groove.

  FIG. 7 shows a knob 60 that is operated when setting or selecting the height of the rising end. The knob 60 is a rotary operation element provided on the back side of the fixed column 42. Using this, the inspector can select any one of the three rising edge height candidates. When the rising edge height is set, the range from the lowest height (base height) to the rising edge height is the effective stroke range at that time. The restriction mechanism 48 prohibits the upward movement of the movable body (directly, the movable column) exceeding the height of the upward end set by the operation of the knob 60. The knob 60 is operated by the examiner, and is not operated by the subject. Rather, it is necessary to avoid easy operation or contact by the subject. 60 are provided. In the vicinity of the knob 60, three numerical values for identifying the three rising edge height candidates are displayed.

  FIG. 8 illustrates three types of rising edge heights. In the state shown on the left side, the rising end height of the pedestal surface of the pedestal 46A is indicated by H3. In the state shown in the center, the height of the rising end of the pedestal surface of the pedestal 46B is indicated by H2. In the state shown on the right side, the height of the rising end of the pedestal surface of the pedestal 46C is indicated by H1. H0 indicates the base height, that is, the lowest height. When H3 is selected as the rising end height, a range (large range) from H0 to H3 is an effective stroke range. When H2 is selected as the rising end height, a range (middle range) from H0 to H2 is an effective stroke range. When H1 is selected as the rising end height, the range (small range) from H0 to H1 is the effective stroke range. For example, the distance between H3 and H2 is in the range of 4-6 cm, and similarly, the distance between H2 and H1 is in the range of 4-6 cm, and the distance between H1 and H0 is 2-5 cm. Within the range. Each numerical value is only an example. In any state, the base height H0 is the same, and the rising end height is selectively changed. Instead of the step-by-step switching method of the rising end height, a continuous switching method may be adopted. The movable column 44 is provided with a scale 62, and the effective stroke range can be recognized in relation to the upper end level of the fixed column 42 on the scale 62.

  FIG. 9 shows a configuration example of the restriction mechanism 48. The restricting mechanism 48 acts between the fixed column 42 and the movable column 44, and includes a guide mechanism 64, a stopper 68, a block 70 for restricting elevation, and the like. The guide mechanism 64 is fixed to the fixed column 42 and has a guide 66. The guide 66 guides the horizontal movement of the stopper 68. The ascent block 70 is fixed to the movable column 44 and moves up and down together therewith. The block 70 has two upward surfaces 72 and 74 having different heights.

  The guide mechanism 64 is a mechanism that converts the rotational movement of the knob 60 into a linear movement of the stopper 68. In FIG. 9, the rising end height H1 (see FIG. 8) is selected, and the stopper 68 is advanced most. In this state, the upward surface 72 is in contact with the lower surface of the distal end portion of the stopper 68, and further upward movement of the upward movement restricting block 70 is restricted. When the rising end height H2 (see FIG. 8) is selected by the rotation of the knob 60, the stopper 68 moves one step to the right in the figure. As a result, the upward movement of the upward movement restricting block 70 is permitted, and the upward movement is restricted when the upward surface 74 contacts the lower surface of the distal end portion of the stopper 68. When the rising end height H3 (see FIG. 8) is selected by further rotation of the knob 60, the stopper 68 is further moved rightward in the drawing, and the contact relationship between the stopper 68 and the lifting limiting block 70 is substantially equal. The movable column 44 is allowed to move upward until it disappears and reaches another mechanical rising end. As described above, according to the present embodiment, it is possible to form a plurality of rising ends by a very simple mechanism. The slide mechanism configured to straddle the fixed column 42 and the movable column 44 is not shown.

  Note that the rotation of the knob 60 may be permitted only when the pedestal is at a specific height, and the rotation of the knob 60 may not be performed otherwise. The specific height may be, for example, the above H0 or the above H1. In the case of employing such a configuration, for example, if a mechanism is provided that allows the sliding movement of the stopper 68 when the movable column 44 is at a specific position, and prohibits the sliding movement of the stopper 68 in other cases. Good. The mechanism may be incorporated in the guide mechanism 64.

  FIG. 10 is an enlarged view showing a relationship among the handle 54b, the lever 58b, and the arm 56b. The lever 58b is in an inclined state. When viewed from above, the handle 54b and the lever 58b are in an overlapping relationship. By lifting lever 58b, it is in a horizontal position. In this state, the lever 58b approaches the handle 54b via a certain gap. This makes it easy to operate the handle 54b with one hand while maintaining the lifted state of the lever 58b. For example, it becomes easy to put weight on the handle 54b through the palm of the hand while lifting the lever 58b with a finger.

  FIG. 11 illustrates the gas spring 50 and the lock release mechanism 52. In the present embodiment, a gas spring with a lock function is used as the gas spring 50. Specifically, the gas spring 50 has a cylindrical body 77 as a main body and a shaft 76 held on the cylindrical body 77. The lower end of the cylinder 77 is attached to a fixed column or leg. The upper end of the shaft 76 is attached to the base 46. A pin 78 is provided at the tip of the shaft 76. The pin 78 is constantly biased in the protruding direction. By applying a pressing force greater than the urging force to the pin 78, the pin 78 sinks. In a state where the pin 78 protrudes, a locked state is formed, the cylinder 77 holds the shaft 76, and the two are integrated. When the pin 78 is sunk, the locked state is released, that is, an unlocked state is formed, and a pushing force is transmitted from the cylinder 77 to the shaft 76. That is, a force is generated that pushes up the movable part including the pedestal 46 upward.

  The lock release mechanism 52 is a mechanism for pressing the pin 78 to form an unlocked state. Specifically, the lock release mechanism 52 includes a horizontal shaft 80, a pair of arms connected to both ends thereof (only one arm 56b is shown in FIG. 11), and a pair of arms provided at the tips of the pair of arms. It has a lever (only one lever 58 b is shown in FIG. 11) and a pressing piece 84 fixed to the horizontal shaft 80. The working end (the left end in FIG. 11) of the pressing piece 84 is in contact with the top of the pin 78.

  In the above configuration, when both or one of the pair of levers is held and the pair of levers is pulled upward (see reference numeral 86), the pair of arms changes from the inclined posture to the horizontal posture, and the horizontal shaft 80 rotates (see FIG. 4). It rotates clockwise in FIG. 11). As a result, the pressing piece 84 pushes the pin 78, and an unlocked state is formed.

  As long as the pair of levers are maintained in the raised state, the unlocked state is maintained. In the unlocked state, a pushing force of the gas spring 50 is generated, and the movable part can naturally move upward unless a force is applied from above to below. The height adjustment can be performed by using the rising motion. Alternatively, in the unlocked state, it is possible to reduce the height of the movable part by applying a pressing force greater than the pushing force to the movable part. When the pair of levers are released after the height adjustment, the pair of arms return to the inclined position, and at the same time, the pressing piece 84 returns to the original position, and the pin 78 returns to the projected state. As a result, a locked state is formed. That is, the height of the movable portion at that time is firmly held.

  The pushing force F1 by the gas spring 50 changes according to the amount of advance of the shaft 76. If there is a height (equilibrium height) at which the pushing force F1 of the gas spring 50 and the total load F2 of the movable part are balanced within the entire stroke range, the current height at the time of the unlock state is reached. If the height is lower than the equilibrium height, the movable part naturally rises slowly to the equilibrium height. Conversely, if the current height at the time of the unlock state is higher than the equilibrium height, the movable portion naturally descends gradually to the equilibrium height. Therefore, in order to improve the usability, it is desirable to appropriately determine the equilibrium height according to the use situation. For example, the balanced height may be set at 40%, 60%, 80%, or 100% of the entire stroke range when viewed from the base height. Further, the equilibrium height may be set in accordance with the frequency of use of the individual rising edge heights. Alternatively, the equilibrium height may be set in consideration of the aging of the gas spring 50 and the like. When calculating the total load of the movable part, the load due to the forearm may be included. In any case, it is desirable to determine various conditions during height adjustment and during bone density measurement so as to enhance safety and workability. As the push-up mechanism, equipment other than the gas spring 50 (for example, a gas damper) may be used.

  FIG. 12 illustrates a situation in which bone density measurement is performed on a subject using a wheelchair. However, illustration of the subject is omitted. The bone density measurement system 10 includes the bone density measurement device 12 and the cart 14 as described above. In the carriage 14, the front side of the support mechanism (fixed column, movable column) is open. The center axis of the support mechanism substantially coincides with the center of gravity of the movable part. The position of the tip of the leg of the carriage 14 (the maximum position in the negative direction of the X axis) is indicated by a line 92. The position of the tip of the lower portion 20 (the maximum position in the negative direction of the X axis) of the bone density measuring device 12 is indicated by a line 90. The lower part of the front part of the lower part 20 is rounded, and the tangent to the lower part is a line 94. The line 92 is on the positive side of the X axis than the line 90. The line 93 indicates the inclination angle or the central axis of the measurement groove.

  As a result of the bone density measurement system 10 being configured as described above, the wheelchair 88 can be brought very close to the bone density measurement device 12 as shown. In particular, a space is formed below the lower part 20 so that the wheel 89 of the wheelchair 88 can be received. In addition, the height of the inclined measurement groove can be adjusted. This greatly reduces the burden on the subject using the wheelchair when inserting his forearm into the measurement groove. The mounting surface, which forms the bottom of the measurement groove, is inclined from the near side to the far side, so that the inserted arm can be guided naturally to the far side. Similar advantages are obtained when measurements are taken on a subject sitting on a chair.

  In addition, since a pair of levers is provided, and any of the levers can be operated to form an unlocked state, the situation shown in FIG. ), Workability or operability can be improved.

(3) Structure of Bone Density Measuring Apparatus FIG. 13 is a schematic sectional view showing the internal structure of the bone density measuring apparatus. As already described with reference to FIG. 4, the housing 16 includes a lower portion, an upper portion, and an intermediate portion. The lower hollow structure is configured as the lower front portion, and the upper hollow structure is configured as the upper front portion. More specifically, the housing 16 includes a bottom plate 37, a front plate 100, a top plate 102, a back wall 103, a ceiling plate 104, a top plate 106, and a back plate 108. The bottom plate 37 is configured as a horizontal plate except for a portion in front thereof. The front plate 100 is configured as a rounded curved plate. The top plate 102 is inclined downward from the near side to the far side, and the inclination angle is θ1. The back wall 103 has a posture inclined from the vertical axis (vertical axis) to the back side, and the inclination angle is θ1. The ceiling plate 104 is provided in parallel with the top plate 102. The top plate 102 and the ceiling plate 104 are orthogonal to the back wall 103, as shown in FIG. The upper surface plate 106 forms the upper surface of the housing, which forms a gentle curved surface. The back plate 108 stands upright. For example, at the time of storage or the like, the entire back surface of the bone density measurement device can be brought close to or contact with a vertical wall surface. As a result, useless space hardly occurs.

  The inside of the housing 16 is hollow. The cavity is roughly divided into a lower inner space 20A, an upper inner space 22A, and an intermediate inner space 24A. An inner bottom plate 110 is provided in the inner space 20A. The inner bottom plate 110 is lowered from the near side to the far side, that is, has an inclined posture. The inclination angle is θ1. A partition plate 116 is provided from the lower part to the vicinity of the upper part through the intermediate part. The partition plate 116 is inclined to the back side like the back wall 103, and the inclination angle is θ1.

  An underground space 20 </ b> B having a wedge shape is formed between the inner bottom plate 110 and the bottom plate 37. In the underground space 20B, the thickness in the vertical direction gradually decreases from the near side to the far side. A back chamber 24B is formed between the partition plate 116 and the back plate 108. The lateral width (the width in the direction (X direction) from the near side to the far side) of the back side chamber 24B generally gradually increases from above to below.

  The inner bottom plate 110 is provided with a slide mechanism, which is constituted by a pair of rail mechanisms 120 and 122. Each of the rail mechanisms 120 and 122 includes, for example, a rail fixed to the inner bottom plate 110 and extending in the left-right direction (Y direction), and a slider engaged with the rail and moving in the left-right direction. The slide mechanism is a mechanism that guides the left and right movement of the internal unit (internal moving body) 118.

  The internal unit 118 includes an X-ray generator 126, a filter unit 128, a connection frame 130, and a support plate 132. They are integrated and move inside the housing 16. The X-ray generator 126 has an X-ray generation tube. In the illustrated configuration example, a plurality of sliders are mounted on the X-ray generator 126 side. An X-ray detector 134 is attached to the support plate 132. The X-ray generator 126 forms a fan beam 136 as an X-ray beam. The X-ray detector 134 is composed of a plurality of sensors arranged in the direction in which the fan beam spreads. By mechanically scanning the fan beam 136 in the left-right direction (Y direction), a two-dimensional irradiation area is formed. Reference numeral 136A indicates the central axis of the fan beam 136. The central axis 136A is inclined backward and has an inclined posture, and its inclination angle is θ1.

  A cooling fan 138 is arranged in the underground space 20B. Specifically, a fan 138 is fixed to the lower surface of the inner bottom plate 110 on the near side. When the underground space 20B is a narrow space, it is difficult to arrange the fan 138 therein. In the present embodiment, the distance between the bottom plate 37 and the inner bottom plate 110 is increased on the near side, and a space for installing the fan 138 is generated. A space for ventilation is secured around the fan 138, and a space for ventilation is secured on the front side of the X-ray generator 126. Incidentally, the inner bottom plate 110 and the partition plate 116 have a large number of through holes, that is, they have air permeability. With such a configuration, the temperature rise of the X-ray generator 126 can be effectively suppressed using the fan 138.

  A power supply unit 140 is arranged below the rear chamber 24B. The power supply unit 140 is a relatively heavy member, and if it is disposed at the back and lower, the center of gravity of the device can be moved to the back and lower.

  Since the expansion of the space is recognized on the near side of the underground space 20B and members such as the fan 138 can be installed there, it is not necessary to install a fan or the like on the near side of the X-ray generator 126. This makes it possible to bring the X-ray generator 126 and the front plate 100 closer to each other. By bringing the fan beam 136 closer to the subject, the burden on the subject can be reduced.

  The lower hollow structure housing the X-ray generator 126 (the front part in the lower part) has a substantially trapezoidal shape when viewed from the side (see reference numeral 30 in FIG. 4). As described above, the vertical thickness of the lower hollow structure gradually decreases from the near side to the far side. Note that a plurality of legs are provided on the bottom plate 37, but these are not shown in FIG. A drive source for mechanically scanning the internal unit 118 is provided inside the housing 16, but this is also not shown.

(4) Measurement Assist Mechanism The measurement assist mechanism 28 will be described with reference to FIGS. FIG. 14 is a top view of the measurement assist mechanism 28. The measurement assist mechanism 28 has a function for adjusting the forearm posture and maintaining the posture, and a function for measuring the forearm length. Specifically, the measurement assist mechanism 28 includes a grip 148 for the right hand, a grip 150 for the left hand, an elbow rest member 152 for the left hand, and an elbow rest member 154 for the right hand. Each of the grips 148 and 150 is a non-detachable grip, and selectively takes a falling posture as an operating posture and a standing posture as a retracting posture. In the falling posture, a state is formed in which the grips 148 and 150 are in close proximity to the mounting surface 26. FIG. 14 shows a combined state of the grip 150 and the elbow pad of the elbow pad member 154.

  The panel 142 constituting a part of the top plate is formed of a member that does not cause much X-ray attenuation. A two-dimensional irradiation area is formed by the scanning of the fan beam. The irradiation area includes a subject irradiation area 144 and an air value acquisition area 146. The forearm needs to be positioned correctly with respect to the subject irradiation area 144. The air value acquisition area 146 is an area for acquiring an air value required for performing a bone density calculation based on the DEXA method. It corresponds to a detected value of X-rays that do not pass through the subject.

  The measurement assist mechanism 28 has a housing 160. Two slits 162, 164 are formed in the housing 160, and markers 166, 168 pass through the slits 162, 164. The ends of the markers 166 and 168 enter the X-ray irradiation space (particularly, the air value acquisition space). The marker 168 slides in conjunction with the sliding movement of the rod 156. An armrest 152 is attached to the end of the rod 156. The marker 166 slides in conjunction with the sliding movement of the rod 158. An armrest 154 is attached to the end of the rod 158. Details thereof will be described later.

  FIG. 15 schematically illustrates a state (measurement state) in which the forearm (left forearm) is properly positioned on the mounting surface 26. The grip 150 is held by the left hand. An elbow pad 152A of the elbow pad 152 is in contact with the left elbow. The housing has two overhangs 180, 182, against which the forearm is abutted. The unused grip 148 is in an upright posture (however, a slightly forwardly inclined posture). The front surface (inclined surface) 148a also contacts the forearm, and functions in positioning the forearm. The armrests of the armrest members 154 are accommodated in the slits of the grip 150, that is, they are in a united state.

  FIG. 16 is a perspective view of the measurement assist mechanism 28. The configuration of the measurement assist mechanism 28 including the components already described will be described in detail. In FIG. 16, the X ′ direction is a front-back direction of the inclined mounting surface, and is a direction inclined from the X direction. The Y 'direction coincides with the Y direction. The Z 'direction is the direction of the center axis of the fan beam, and is a direction inclined from the Z direction.

  The measurement assist mechanism 28 has a grip 148 for the right arm, a grip 150 for the left arm, an assembly 176 for the left arm, an assembly 178 for the right arm, and a housing 160. The grips 148 and 150 have slits 148A and 150A, respectively. The assembly 176 has an armrest 152 and a rod 156. A part of the elbow pad 152 is an elbow pad 152A. The assembly 178 has an armrest 154 and a rod. A part of the armrest 154 is an armrest 154A.

  The housing 160 has a slope 184, in which two slits 162, 164 arranged in the Y 'direction are formed. Some of the markers 166 and 168 protrude from the slits 162 and 164. The markers 166 and 168 are constituted by members that greatly attenuate X-rays. The housing 160 has overhang portions 180 and 182 that bulge toward the near side. The slope 184 has an angle parallel to the hypotenuse of the fan beam. The rotation shafts of the grips 148 and 150 are not shown.

  FIG. 17 shows the grip 150 in the falling posture. FIG. 17 also shows the relationship between the X direction and the X 'direction, and the relationship between the Z direction and the Z' direction. In the collapsed position, the center axis of the grip 150 is shown by the line 190. A line 192 indicates the inclination angle of the mounting surface. An angle difference occurs between the line 192 and the line 190. The grip 150 is slightly upward with respect to the mounting surface. An elbow pad is accommodated in the slit of the grip 150, and a part (lower part) of the elbow pad is exposed in the accommodated state. The longitudinal direction (or lower side) of the elbow pad is parallel to the line 192. FIG. 18 shows the grip 150 in the standing posture. In this state, the elbow pad 154A is completely exposed.

  FIG. 19 shows a configuration example of the left arm assembly 176. FIG. 19 shows the rear side of the housing 160. An armrest 152 is attached to the end of the rod 156. The rod 156 slides in the Y direction. The rack 202 is provided on the rod 156. The conversion unit 200 is provided inside the housing 160. The conversion unit 200 has a plurality of pinions 204 and a rack 206. The plurality of pinions 204 convert the amount of movement between the rack 202 and the rack 206. Specifically, the conversion unit 200 has a function of moving the marker 168 by, for example, １ ／ of the movement of the rod 156. Thereby, the position of the elbow rest member 152 can be specified from the position of the marker 168. That is, the position of the armrest member 152 can be specified by image analysis without providing an encoder or the like for detecting the linear movement distance of the rod 156. This has the advantage of reducing the number of parts. In FIG. 19, the grip 148 is in an upright state. The right arm assembly has a symmetrical configuration with the left arm assembly 176. The measurement assist mechanism of the present embodiment has two regulating mechanisms.

  FIG. 20 shows the regulation mechanism 210A in the regulation state. FIG. 21 shows the regulation mechanism 210B in the non-regulation state. The restricting mechanisms 210A and 210B allow the grips 148 and 150 to fall only when the assembly is at the home position (the position most pulled into the housing), and restrict the grips 148 and 150 from falling in other states ( Prohibition).

  In FIG. 20, the grip 148 has a standing posture. An opening 212 is formed in the grip 148, and the projection 220 of the rotating body 214 enters into the opening 212. The engagement restricts the grip 148 from falling down. The rotating body 214 has a groove 216. On the other hand, the armrest member 152 has a hook 218. When the assembly is retracted into the housing (direction B in FIG. 20) and reaches the home position, the tip of the hook 218 enters the groove 216 and rotates the rotating body 214 clockwise. Then, the projection 220 of the rotating body 214 comes off from the opening 212, and the rotating movement (falling movement) of the grip 148 becomes possible. To move the assembly in the opposite direction (A direction in FIG. 20), the grip 148 must be returned to the upright position.

  FIG. 21 shows the grip 150 in an unregulated state. In the illustrated example, the rotating body 230 rotates counterclockwise, and the protrusion 228 of the rotating body 230 is separated from the opening 226. When the grip 150 falls down on the mounting surface side, the elbow pad naturally enters the slit formed in the grip 150. By this combination, the grip 150 is structurally reinforced.

  As shown in FIG. 22, a detector 231 for detecting the posture of the grip 150 is provided. The detector 231 has a light-emitting device and a light-receiving device, and when a light-shielding plate enters between them, an optical output signal changes. Thereby, it is detected whether or not the light blocking state has occurred (that is, whether the posture is the falling posture or the standing posture). The light shield is configured as a moving piece attached to the base of the grip 150. A similar detector is provided on the other grip. A microswitch or the like may be used as the detector 231.

  As described above, according to the respective regulation mechanisms, the unused elbow rests are accommodated in the slits of the grip, and the union of the two is naturally formed. In order to depress the grip to be used, it is necessary to push an unused assembly. Therefore, it is possible to prevent a situation in which a bone density measurement is performed with the unused assembly protruding halfway. The sliding movement of the assembly used is, of course, permitted. However, in this case, the standing grip is forced for the unused grip, so that the unused grip does not hinder the measurement.

(5) Data Processing and Control FIG. 23 is a block diagram of a bone density measuring device. The internal unit 237 includes an X-ray generator 234 and an X-ray detector 236. The internal unit 237 is mechanically scanned by the scanning mechanism 238. Low-energy X-rays and high-energy X-rays are generated alternately by switching a filter that acts on X-rays. The memory 240 stores a low energy X-ray detection value and a high energy X-ray detection value for each pixel. The processor 242 includes a marker position calculation unit 244, a measurement site calculation unit 245, a bone density image formation unit 246, a control unit 247, and the like. In FIG. 23, the input unit and the display are not shown.

  The marker position calculation unit 244 calculates a marker position by image analysis based on a two-dimensional image (transmission image) composed of a plurality of low-energy X-ray detection values, for example. A two-dimensional image composed of a plurality of high-energy X-ray detection values may be an analysis target. The measurement part calculation unit 245 has a function of specifying a reference position based on the two-dimensional image, a function of calculating a forearm length from the reference position and the marker position, a function of calculating a measurement part based on the reference position and the forearm length, and the like. Having. The reference position is, for example, an ulnar pedicle. A measurement site (average bone density calculation site) is determined around a position 1 / n (n is, for example, 3, 6, 10) of the forearm length from the reference position.

  The bone density image forming unit 246 calculates the bone density in accordance with the DEXA method on a pixel basis based on the data in the memory 240, and forms a bone density image. When calculating the average bone density, a bone density image is referred to. The control unit 247 controls operations of the scanning mechanism 238, the X-ray generator 234, and the like.

  FIG. 24 shows the contents of control by the control unit. The row 300 shows the grip state for the right arm. Column 302 shows the left arm grip state. Each grip state is determined from the output signals of the two detectors. A column 304 indicates a determination result or control content.

  As shown in line 306, when the standing posture of the grip for the right arm and the falling posture of the grip for the left arm are detected, the left arm is determined as the measurement target, and the bone density measurement for the left arm is executed. As shown in line 308, when the falling posture of the grip for the right arm and the standing posture of the grip for the left arm are detected, the right arm is determined as a measurement target, and the bone density measurement for the right arm is executed. As shown in the row 310, when the standing posture of the grip for the right arm and the standing posture of the grip for the left arm are detected, the measurement is prohibited. As shown in row 312, the measurement is also prohibited when the falling posture of the right arm grip and the falling posture of the left arm grip are detected. Such control can enhance safety.

  The method of calculating the marker position will be described with reference to FIGS. In FIG. 25, the fan beam area 250 includes an end air value area 254. Reference numeral 251 indicates all reception channels (sensor rows). A part 252 of them becomes a channel group for acquiring air value. When the markers 166 and 168 enter the fan beam area 250, the influence appears on a part of the channel group for obtaining air value.

  FIG. 26 shows a two-dimensional image (transmission image) 256 and an average value profile 265. The two-dimensional image 256 is configured by, for example, a plurality of low-energy X-ray detection values. In the entire range 251A in the X 'direction, the end region is the air value acquisition region 252A. Marker images 262 and 264 appear in the air value acquisition area 252A. Specifically, the marker images 262 and 264 appear in the thin band-shaped region 257A. An average value profile 265 is obtained by plotting the average detection value (average value) for each Y coordinate in the area 257A. As shown, two valleys 266 and 268 occur corresponding to the two marker images 262 and 264. By specifying the centers 270 and 272 of each valley, the position (Y coordinate) of each marker is specified.

  Actually, if the arm to be measured is the left arm, the Y coordinate of the marker image 264 is calculated, and if the arm to be measured is the right arm, the Y coordinate of the marker image 262 is calculated. Incidentally, the moving ranges of the marker images 262 and 264 are indicated by reference numerals 258 and 260. The position of each marker may be calculated by a method other than the above. In calculating the air value, two marker images are excluded.

(6) Measuring Process FIG. 27 is a flowchart showing the process of measuring bone density. In S10, the rising edge height is selected (reset) by the inspector as needed. For example, the rising edge height is selected according to the subject group to be examined. In S12, the height of the measurement groove is adjusted by the examiner according to the subject. At that time, an unlocked state is formed, and the height is adjusted in this state. After the height adjustment, a locked state is formed, and the height after the adjustment is maintained. In S14, the grip to be used is lowered by the inspector. At that time, an unused elbow rest is accommodated in the grip. In S16, the examiner performs an operation of sliding the elbow pad used far. Then, in S18, the grip is gripped by the hand of the arm to be measured, and at the same time, the arm is abutted against the overhanging portion. This positions the arm. Thereafter, the examiner applies an elbow rest to the elbow head of the arm to be measured. In S20, a bone density measurement is performed.

  FIG. 28 is a flowchart illustrating an example of a control method of the bone density measurement device. The control method is executed by the control unit shown in FIG. In S30, a target (right arm or left arm) is specified based on the output signals of the two detectors. At this stage, if the measurement target cannot be appropriately specified, the measurement is prohibited as shown in S31. In S32, the internal unit is transported to the scanning start position corresponding to the measurement target. The scanning start position is selected according to the measurement target from the scanning start position for the right arm (scanning origin on the left side of the device) and the scanning start position for the left arm (scanning origin on the right side of the device). This is because a scan from the distal end side of the forearm to the opposite side is usually required.

  In S34, irradiation and scanning are started. In S36, the marker detection process is executed in real time, that is, in parallel with the data acquisition. In this marker detection processing, it is determined whether or not the transmitted image formed up to that point includes the entire marker image, and if that is included, the marker position is calculated. A measurement site is calculated based on the marker position. A required scanning range (a range where fan beam scanning is required) is determined as a range covering the measurement site. Note that when scanning of the entire range is required regardless of the measurement site, the entire range is the necessary scanning range.

  In S38, it is determined whether or not the scanning for the required scanning range has been completed. If the scanning has not been completed, the steps after S36 are repeatedly executed. If it is determined in S38 that the scanning for the necessary scanning range has been completed, control for terminating the irradiation and the scanning is performed in S40.

(7) Modified Example The bone density measuring device may be mounted on a supporting device other than the above-described cart. Alternatively, the bone density measuring device and the cart may be integrated. The height after adjustment may be recorded for each subject, and the recorded height may be used when performing the bone density measurement again for the same subject. For example, the height may be displayed. It is also conceivable to use the recorded height for automatic height adjustment. From the information about the subject (age, gender, height, etc.), a standard or standard height may be obtained and displayed.

  Although the fan beam is used in the above embodiment, a pencil beam or a cone beam may be used instead. When calculating the forearm length, the ulnar styloid process is used. Instead of specifying the position of the ulnar styloid process by image processing, the position may be specified by manually aligning the laser marker with the ulnar styloid process.

  When both of the grips are in the falling posture, the internal unit may be positioned at the center in the left-right direction. According to this, when the measurement is restarted, the movement time is the same regardless of the position where the internal unit is moved to any scanning start position. According to such control, the weight balance of the apparatus can be improved during transport. It is also conceivable to automatically move the assembly including the armrest. It is also conceivable to automate the change in the posture of the grip.

  In the above embodiment, the marker position is detected in real time. However, a temporary transmission image may be acquired by pre-scanning, and the marker position may be specified based on the temporary transmission image. Alternatively, the marker position may be specified based on the transmission image after performing the full range scan.

Reference Signs List 10 bone density measuring system, 12 bone density measuring device, 14 cart, 16 housing, 18 measuring groove, 20 lower part, 22 upper part, 24 middle part, 26 mounting surface, 28 measuring assist mechanism, 40 supporting mechanism, 48 limiting mechanism , 50 gas spring, 52 lock release mechanism, 110 inner bottom plate, 118 internal unit, 120, 122 rail mechanism (slide mechanism), 126 X-ray generator, 134 X-ray detector, 148, 150 grip, 152, 154 elbow pad Members, 166, 168 marker, 176 assembly for left arm, 178 assembly for right arm, 210A, 210B regulating mechanism.

Claims (12)

A first grip that is in an operating position when measuring the right arm and is in a retracted position when measuring the left arm;
A second grip that is in an operating posture when measuring the left arm and is in a retracted posture when measuring the right arm;
A bone density measuring device, characterized by comprising: The device of claim 1,
Including the mounting surface on which the arm that has been measured is mounted,
Each of the operating postures is a falling posture that occurs in a state where the grips fall toward the mounting surface described above,
The respective retracted postures are postures that occur when the grips are separated from the mounting surface.
A bone density measuring device, characterized in that: The device according to claim 2,
Each of the evacuation postures is a standing posture,
A bone density measuring device, characterized in that: The device of claim 1,
A right arm measurement slide member including a right elbow rest that is in contact with the right elbow during the right arm measurement,
A left arm measurement slide member including a left elbow abutment piece abutted on the left elbow at the time of the left arm measurement,
Including
In the operating posture of the first grip, the first grip and the left elbow pad are in a first engagement state,
In the operating posture of the second grip, the second grip and the right elbow rest are in a second engagement state,
A bone density measuring device, characterized in that: The device according to claim 4,
A slit is formed in each of the grips,
Each of the engagement states is a state in which each of the elbow pads is housed in each of the slits.
A bone density measuring device, characterized in that: The device according to claim 4,
A first regulating mechanism that allows a posture change due to the first grip falling down when the first engagement state can be formed, and restricts a posture change due to the falling down of the first grip otherwise;
A second restricting mechanism that allows a posture change due to the falling of the second grip when the second engagement state can be formed, and restricts a posture change due to the falling of the second grip in other cases;
A bone density measuring device, characterized by comprising: The device according to claim 4,
An X-ray attenuation member that slides in conjunction with the slide movement of the right arm measurement slide member, and a right arm measurement marker protruding into the X-ray irradiation space,
An X-ray attenuation member that slides in conjunction with the sliding movement of the left arm measurement slide member, and a left arm measurement marker protruding into the X-ray irradiation space,
A bone density measuring device, characterized by comprising: The apparatus according to claim 7,
A marker position calculation unit that calculates the position of the right arm measurement marker based on the X-ray detection data during the right arm measurement, and calculates the position of the left arm measurement marker based on the X-ray detection data during the left arm measurement.
A measurement site calculation for calculating a right arm bone density measurement site based on the position of the right arm measurement marker at the time of measuring the right arm, and a left arm bone density measurement site based on the position of the left arm measurement marker at the time of measuring the left arm. Department and
A bone density measuring device, characterized by comprising: The device of claim 1,
A first detector for detecting a posture of the first grip;
A second detector for detecting a posture of the second grip;
A control unit that controls device operation based on the detection result of the first detector and the detection result of the second detector;
A bone density measuring device, characterized by comprising: The device according to claim 9,
The control unit prohibits X-ray irradiation when both the first grip and the second grip are in the operating posture and when both the first grip and the second grip are in the retracted posture. Do
A bone density measuring device, characterized in that: In the control method of the bone density measurement device,
Detecting the posture of the first grip gripped when measuring the right arm;
Detecting the posture of the second grip gripped when measuring the left arm;
Controlling the operation of the bone density measuring device based on the posture of the first grip and the posture of the second grip;
A control method comprising: The control method according to claim 11,
In the step of controlling the operation, when one of the first grip and the second grip is in the operating posture and the other is in the retracting posture, X-ray irradiation is permitted. Irradiation is prohibited,
A control method characterized in that: