JP2018179983A - Reference gauge for x-ray ct apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new reference gauge for an X-ray CT apparatus which contributes to the evaluation of the basic characteristics or to the calibration of the X-ray CT apparatus for industrial products, and to provide a reference gauge for an X-ray CT apparatus which can be widely applied to industrial products made of various types of materials.SOLUTION: The reference gauge for an X-ray CT apparatus has a reference gauge body C having a first member 10 and a second member 20 freely removable from or attachable to the first member 10. The first member 10 is provided with a reception unit 11 capable of receiving the second member 20, the second member 20 is provided with an insertion unit 21 to be inserted into the reception unit 11. The first member 10 and the second member 20 are made of different materials.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a reference gauge for an X-ray CT apparatus for evaluating basic characteristics of a CT (Computer Tomography) apparatus using X-rays.

  X-ray CT apparatuses have been widely used mainly in the medical field in order to obtain cross-sectional images or three-dimensional images of the inside of an object to be measured. In this X-ray CT apparatus, basic characteristics (for example, contrast scale, spatial resolution, contrast resolution, etc.) of the X-ray CT apparatus are evaluated and calibrated using a reference machine called a phantom (hereinafter referred to as a reference gauge) That is commonly done.

  By the way, in recent years, from the feature that the inside of the object of the X-ray CT apparatus can be observed nondestructively, application is expected also in various industrial fields other than the medical field for the purpose of nondestructive inspection and defect inspection of industrial products. There is. Conventionally, as a reference gauge for such industrial products, a step cylinder as shown in FIGS. 1 and 2 of Patent Document 1, a step phantom as shown in FIG. 2 of Non-Patent Document 1, etc. are used. It has been

  Under these circumstances, industrial applications such as observation and dimension measurement of built-in parts of industrial products and microscopic applications are activated, and the standard for the purpose of calibration of dimensions in three-dimensional measurement and evaluation of X-ray CT system Various improvements in gauges have been proposed (for example, Patent Documents 1 to 3).

Patent Document 1 describes a standard gauge technique for calibration and evaluation of an X-ray CT apparatus comprising a beryllium molded body and an outer package including the beryllium molded body.
Further, Patent Document 2 describes a cylindrical structure having a circular cross section and a hollow inside, and a technique of an X-ray calibration phantom in which a plurality of indexes are provided on the surface thereof, and Patent Document 3 Describes a calibrator technique in which a plurality of balls of different outer diameters are disposed outside the circumference of a cylinder or cylinder.

JP 2012-189517 A JP 2001-149363 A JP, 2014-190933, A

Yamamoto Koji, 3 others "Evaluation accuracy of measurement dimensions using X-ray CT" Aichi National Science and Technology Research Center Research Report 2014 p. 22-25

  By the way, in the measurement of the X-ray CT apparatus, the material (size) and the like of the object to be measured are based on the X-ray source of the X-ray CT apparatus, the X-ray detector, and the specification, performance and setting conditions of the optical system Many variable factors are intertwined until the final measurement data is obtained.

  For example, it is known that the absorptivity of X-rays varies depending on the material, and generally, the higher the density, the higher the absorptivity, and the larger the atomic number, the higher the absorptivity. Therefore, in the X-ray CT apparatus to be used, it is necessary to confirm in advance whether or not the desired measurement accuracy is secured with the configuration / material that the user wants to measure.

  In particular, industrial products are usually configured such that built-in parts are covered with exterior parts. Therefore, in order to accurately evaluate the basic characteristics of the X-ray CT apparatus, it is desirable to use a reference gauge of a configuration in which the material corresponding to the built-in component is covered with the material corresponding to the exterior component.

  In addition, industrial products are usually composed of a plurality of different materials, and in order to carry out calibration for measuring the dimensions of built-in parts, standards composed of the same materials as exterior parts and built-in parts It is desirable to use a gauge, and in order to correspond to a large number of objects to be measured, it is desirable to be able to select the material of the reference gauge in accordance with the material to be measured.

However, the standard gauge disclosed in Patent Document 1 is configured to cover the beryllium molded body with the exterior body, and the material of the exterior body and the material inside the exterior body are changed according to the material of the industrial product that the user wants to measure It was not possible.
Further, the calibrators described in Patent Document 2 and Patent Document 3 are not premised on calibration at the time of measuring the built-in component, and the material was not a configuration covered with another material.
Moreover, it was not configured to be able to measure the performance of the device with respect to the damping factor of the material.

The present invention has been made in consideration of the above points, and provides a novel reference gauge for X-ray CT apparatus which contributes to basic characteristic evaluation and calibration of X-ray CT apparatus for industrial products. As an issue.
Another object of the present invention is to provide a reference gauge for an X-ray CT apparatus which can be widely compatible with industrial products formed of various materials.

In order to solve the above problems, a reference gauge for an X-ray CT apparatus according to the present invention comprises a reference gauge main body having a first member and a second member which is attachable to and detachable from the first member, the first member Is provided with a receptacle capable of receiving the second member, the second member is provided with an insertion part inserted into the receptacle, and the first member and the second member are made of different materials. It is characterized by being formed by
The term "reception" as used herein refers to accepting that at least a part of the second member intrudes in the inward direction of the first member.

  According to the reference gauge for X-ray CT apparatus of the present invention, since the insertion portion of the second member is inserted into the receiving portion of the first member, the second member is disposed in the first member at the insertion location. Can be measured. That is, the same configuration as when measuring the built-in parts of industrial products can be created, and the accuracy of basic characteristic evaluation and calibration of the X-ray CT apparatus for industrial products can be improved.

In a preferred embodiment of the present invention, the first member and / or the second member includes a member group including a plurality of members formed of materials having different absorption coefficients of radiation.
Thus, the material of the reference gauge can be easily changed in accordance with the material of the industrial product to be measured by having a member group consisting of a plurality of members formed of materials having different radiation absorption coefficients. As a result, it is possible to provide a reference gauge that widely corresponds to industrial products formed of various materials.

In a preferred embodiment of the present invention, the first member and / or the second member has a measurement assisting portion formed of materials having different radiation absorption coefficients inside the member.
As described above, by providing the measurement assisting portion inside the member, the accuracy of calibration can be improved by using the measurement assisting portion as an index.

In a preferred embodiment of the present invention, the first member and / or the second member has a measurement support space inside the member.
As described above, by providing the auxiliary measurement space inside the member, it is possible to improve the calibration accuracy by using the auxiliary measurement part as an index.

In a preferred embodiment of the present invention, the outer shape of the reference gauge body is formed in a substantially prismatic shape.
By forming the outer shape of the reference gauge main body into a substantially prismatic shape in this way, it is possible to perform basic characteristic evaluation in a situation closer to the substantially prismatic object to be measured.

In a preferred embodiment of the present invention, the outer shape of the reference gauge body is formed in a substantially cylindrical shape.
By forming the outer shape of the reference gauge main body in a substantially cylindrical shape in this way, the attenuation factor etc. of the material can be accurately measured by making the distance through which the X-ray passes through the reference gauge main body always the same distance. .

In a preferred embodiment of the present invention, the outer shape of the reference gauge main body is formed in a substantially elliptic cylindrical shape.
Thus, by forming the outer shape of the reference gauge main body into a substantially elliptic cylindrical shape, the attenuation rate of the material, etc. can be accurately measured by continuously changing the distance through which the X-ray passes through the reference gauge main body according to the rotation angle. be able to.

In a preferable mode of the present invention, the outer shape of the reference gauge main body is formed in a substantially cylindrical shape, and the receiving portion and / or the insertion portion is formed in a substantially elliptic cylindrical shape.
By thus forming the outer shape of the reference gauge body in a substantially cylindrical shape and forming the receiving portion and / or the insertion portion in a substantially elliptic cylindrical shape, the performance of the device with respect to the attenuation factor of the material of the reference gauge body is precisely adjusted. It can be measured.

In a preferred embodiment of the present invention, the outer shape of the reference gauge main body is formed in a substantially elliptic cylindrical shape, and the receiving portion and / or the insertion portion is formed in a substantially cylindrical shape.
As described above, the outer shape of the reference gauge body is formed in a substantially elliptic cylindrical shape, and the receiving portion and / or the insertion portion is formed in a substantially cylindrical shape, so that the performance of the device with respect to the attenuation factor of the material of the reference gauge body is precisely adjusted. It can be measured.

In a preferred embodiment of the present invention, the second member is further provided with a second receiving portion for receiving the first member, and the first member is a second insertion portion inserted into the second receiving portion. Furthermore, the receiving portion and the second receiving portion are formed in the same shape, and the insertion portion and the second insertion portion are formed in the same shape.
With such a configuration, the measurement of the second member in the first member and the measurement of the first member in the second member can be performed simultaneously. Further, the types of materials of the member group can be reduced.

In a preferred embodiment of the present invention, the first member and / or the second member has a liquid storage portion capable of containing a liquid inside the member.
As described above, by providing the liquid storage portion capable of containing the fluid such as liquid or gel inside the member, it is possible to perform measurement in the fluid.

  In a preferred embodiment of the present invention, the reference gauge body further comprises a third member detachably attachable to the second member, the third member having a third receiving portion capable of receiving the second member, The second member may be accommodated in the receiving portion and the third receiving portion.

In a preferred embodiment of the present invention, the third member includes a member group including a plurality of members formed of materials having different absorption coefficients of radiation.
Thus, the measurement data acquired by one measurement can be increased by having the member group which also consists of several members in the 3rd member.

Another aspect of the present invention is characterized by including a reference gauge main body formed in a tubular shape, the outer shape being formed in a substantially cylindrical shape, and the inner shape being formed in a substantially elliptical middle shape.
By thus forming the outer shape of the reference gauge body in a substantially cylindrical shape and forming the inner shape in a substantially elliptic cylindrical shape, it is possible to accurately measure the performance of the device with respect to the attenuation factor of the material of the reference gauge body. .

Another aspect of the present invention is characterized by comprising a reference gauge main body formed in a tubular shape, the outer shape being formed in a substantially elliptical shape, and the inner shape being formed in a substantially circular shape.
As described above, the outer shape of the reference gauge body is formed in a substantially elliptic cylindrical shape, and the inner shape is formed in a substantially cylindrical shape, so that the performance of the device with respect to the attenuation factor of the material of the reference gauge body can be accurately measured. .

The present invention can provide an unprecedented reference gauge for X-ray CT apparatus that contributes to basic characterization and calibration of the X-ray CT apparatus for industrial products.
In addition, the present invention can provide a reference gauge for an X-ray CT apparatus which can be widely compatible with industrial products formed of various materials.

  Other objects, features and advantages will be apparent on reading the following detailed description of the invention when taken in conjunction with the drawings and the claims.

It is a figure which shows the usage method of the reference | standard gauge for X-ray CT apparatus of this invention. It is a perspective view of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 1 of this invention. It is a figure of the 1st member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 1 of this invention. It is a figure of the 2nd member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 1 of this invention. It is a perspective view of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 2 of this invention. It is a figure of the 1st member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 2 of this invention. It is a figure of the 2nd member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 2 of this invention. It is a perspective view of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 3 of this invention. It is a figure of the 1st member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 3 of this invention. It is a figure of the 2nd member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 3 of this invention. It is a figure which shows the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 4 of this invention. It is a figure which shows the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 5 of this invention. It is a figure which shows the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 6 of this invention. It is a figure of the 1st member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 7 of this invention. It is a figure of the 2nd member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 7 of this invention. It is a figure of the 1st member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 8 of this invention. It is a figure of the 2nd member of the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 8 of this invention. It is a figure which shows the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 9 of this invention. It is a figure which shows the reference | standard gauge for X-ray CT apparatuses which concerns on Embodiment 10 of this invention.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments 1 to 10 of the present invention will be described in detail with reference to FIGS. The technical scope of the present invention is not limited to the embodiments shown in the attached drawings, and can be appropriately modified within the scope described in the claims.

  First, an example of the X-ray CT apparatus A used for measuring the X-ray CT apparatus reference gauge C according to the present invention (hereinafter referred to as the reference gauge main body C) will be described with reference to FIG. Embodiments 1 to 10 of the reference gauge body C will be described with reference to FIGS.

<X-ray CT system>
FIG. 1 is a schematic view showing measurement of a reference gauge body C using an X-ray CT apparatus A. As shown in FIG. The X-ray CT apparatus A shown in FIG. 1 includes an X-ray source A1 for irradiating X-rays, an X-ray detector A2 disposed opposite to the X-ray source A1, and the X-ray sources A1 and X1. And a position adjustment pedestal A3 of the reference gauge main body C disposed between the line detectors A2.

  The position adjustment pedestal A3 has a rotary table A4 capable of rotating the reference gauge main body C, and a movable base A5 for moving the reference gauge main body C in parallel with the X-ray irradiation direction. It is configured to be able to move and hold at a preferred position for measuring. Although not shown, the position adjustment pedestal A3 may further be provided with a height adjustment mechanism for adjusting the height position of the reference gauge main body C.

  There is also an X-ray CT apparatus A which rotates the X-ray source A1 and the X-ray detector A2 about the object to be measured (reference gauge main body C) without rotating the rotary table A4. The operation principle is the same as that of the X-ray CT apparatus, and therefore, the case where an X-ray CT apparatus for rotating the rotary table A4 is used will be described here.

  In the measurement using the X-ray CT apparatus A, the measurement target (reference gauge main body C) is held at a preferable position for measurement by the position adjustment pedestal A3, and is rotated by the rotation table A4 while the side surface of the measurement target X-rays are emitted from the X-ray source A1 disposed in the direction (horizontal direction). The X-rays pass through the object to be measured and reach the X-ray detector A2, whereby measurement data D can be obtained.

  That is, as a calibration method of measurement conditions of the X-ray CT apparatus using the reference gauge main body C according to the present invention, a moving step of moving the reference gauge main body C using the position adjustment pedestal A3, and The measurement process which acquires measurement data D, and the calibration process which calibrates each measurement condition using this measurement data D are included.

The measurement conditions referred to herein indicate the wavelength and intensity of X-rays irradiated from the X-ray source A1, the sensitivity and resolution of the X-ray detector A2, the change of the position and material of the reference gauge main body C, and the like.
The reference gauge main body C according to the present invention has precise dimensions described in the specification of the reference gauge main body C, and comparison with the measurement data D is performed based on the dimensions described in the specification.
That is, by comparing the actually measured values of the shape and dimension of the reference gauge main body C specified in advance with the calculated values of the shape and dimension of the reference gage body C calculated based on the measurement data D of the X-ray CT apparatus A, Calibration and evaluation of measurement conditions and calculated values of the X-ray CT apparatus A are performed using measured values as standard values.

First Embodiment
2 to 5 show a reference gauge body C1 according to the first embodiment. The reference gauge main body C1 according to the first embodiment includes a first member 10 and a second member 20 attachable to and detachable from the first member 10. FIG. 2 shows a perspective view of a state in which the first member 10 and the second member 20 are combined. FIG. 3 shows a perspective view of the first member 10 and the second member 20 in an exploded state. FIG. 4 shows an external view of the first member 10, and FIG. 5 shows an external view of the second member 20. As shown in FIG.

  The outer shape of the reference gauge main body C1 according to the first embodiment is formed substantially in a prismatic shape as a whole. Although FIG. 2 to FIG. 5 show the square-bar-like reference gauge main body C1, a triangular prism, a hexagonal prism, an octagonal prism or the like may be adopted.

The first member 10 includes a receiving portion 11 capable of receiving the second member 20, a measurement assisting portion 12 formed of a material having a different absorption coefficient of radiation inside the member (in the first member 10), and the inside of the member And a measurement auxiliary space 13 formed by providing a space in one member 10).
The first member 10 is formed in a substantially square pole shape, and has an upper surface 10a, an outer peripheral surface 10b, and a lower surface 10c.

  Further, as shown in FIG. 3, the first member 10 is a member group formed of a plurality of members including first members 10A and 10B of substantially the same shape formed of materials having different absorption coefficients of radiation (first It may have a member group 10G). In addition, in FIG. 3, although the 1st member group 10G which consists of two 1st members 10A and 10B was illustrated, the 1st member 10A, 10B, 10C ... and the 1st containing two or more members The member group 10G may be used.

  The receiving portion 11 is formed in a substantially prismatic shape in conformity with the outer shape of the reference gauge main body C1, and has an upper receiving portion 111 formed in a small diameter square pole shape and a lower receiving portion 112 formed in a large diameter square pole shape. And. The receiving portion 11 may be set to have a shape and a size for receiving at least a part of the second member 20, and more preferably, a shape and a size corresponding to the insertion portion 21 of the second member 20 described later. It is set to. Specifically, although the two-stage receiving portion 11 including the upper receiving portion 111 and the lower receiving portion 112 has been illustrated, it may have a single-stage structure, or may have three or more stages.

The upper receiving portion 111 has a top surface 111a and an inner circumferential surface 111b.
The lower receiving portion 112 is formed to have a diameter larger than that of the upper receiving portion 111, and thus the top surface 112a formed between the lower receiving portion 112 and the upper receiving portion 111, and the inner circumferential surface 112b larger than the inner circumferential surface 111b. have.

  The measurement assisting portion 12 is a member embedded in the first member 10, and is formed of a material different from the first member 10 in absorption coefficient of radiation. Therefore, when X-ray measurement is performed, the shape, position, and size of the measurement assisting unit 12 are reflected in the measurement data D (measurement assisting unit data 12D of FIG. 1) and described in the specification of the reference gauge main body C. By comparing with the dimensions, it is used for basic characteristic evaluation and calibration of the X-ray CT apparatus A.

The measurement assisting portion 12 is formed, for example, in a spherical shape or a rod-like shape, and in FIGS. 2 to 4, the measurement assisting portion 12a formed in a large diameter spherical shape and the measurement assistance formed in a medium diameter spherical shape The portion 12 b and the small-diameter spherical measurement auxiliary portion 12 c are disposed at different heights. The measurement aids 12a, 12b and 12c are arranged on a circle of the same diameter d in plan view (see FIG. 4 (b)).
Examples of the measurement assisting unit 12 include beads and balls. The shape, size, and arrangement of the measurement assisting portion 12 can be freely set, and even if a plurality of spheres are arranged in a spiral or a plurality of rods are arranged in the vertical direction and the horizontal direction Good.

The measurement auxiliary space 13 is a space formed in the first member 10, and is formed in, for example, a spherical shape or a rod shape. The auxiliary measurement space 13 may be formed to be embedded in the first member 10 in the same manner as the auxiliary measurement portion 12 or, as shown in FIGS. 2 to 4, to communicate with the outside of the first member 10. It may be formed in Further, the shape, size, and position of the auxiliary measurement space 13 can be changed as appropriate as the auxiliary measurement portion 12.
The shape, position, and size of the measurement auxiliary space 13 are reflected in the measurement data D in the same manner as the measurement auxiliary portion data 12D, and compared with the dimensions described in the specification of the reference gauge main body C, X-ray CT. It is used for basic characteristic evaluation and calibration of the device A.

  The second member 20 is formed by providing a space in the insertion portion 21 inserted into the receiving portion 11, the pedestal portion 22 provided below the insertion portion 21, and the inside of the member (in the second member 20). And a measurement auxiliary space 23. Although not shown, a measurement aid similar to the measurement aid 12 of the first member 10 may be further provided.

  Further, like the first member 10, the second member 20 is a member group formed of a plurality of members including second members 20A and 20B of substantially the same shape formed of materials having different radiation absorption coefficients. The second member group 20G may have two member groups 20G) (see FIG. 3), and the second member group 20G may include two or more members (second members 20A, 20B, 20C,...).

The insertion portion 21 is formed in a substantially prismatic shape to match the outer shape of the reference gauge main body C 1, and the upper insertion portion 211 inserted into the upper receiving portion 111 and the lower insertion portion 212 inserted into the lower receiving portion 112. ,have. That is, the upper insertion portion 211 is formed in a small diameter square prism, and the lower insertion portion 212 is formed in a large diameter square prism.
The upper insertion portion 211 has an upper surface 211 a facing the top surface 111 a and an outer peripheral surface 211 b facing the inner peripheral surface 111 b.
The lower insertion portion 212 is formed to have a diameter larger than that of the upper insertion portion 211, and has an upper surface 212a facing the top surface 112a and 212b facing the inner circumferential surface 112b.
In addition, although the receiving part 11 of 2 step | paragraph structure comprised from the upper insertion part 211 and the lower insertion part 212 was illustrated, 1 step structure may be sufficient and the structure of 3 or more steps may be sufficient.

The pedestal portion 22 is formed in a square prism as a whole, and is a lower surface provided with an upper surface 22a facing the lower surface 10c of the first member 10, an outer peripheral surface 22b, and a fixing portion 24 fixed to the X-ray CT apparatus A. And 22c. Since the width and depth of the pedestal 22 are configured to match the outer shape of the first member 10, the reference gauge main body C1 as a whole is a square prism when the first member 10 and the second member 20 are combined. Is formed. That is, the outer peripheral surface 10 b of the first member 10 and the outer peripheral surface 22 b of the pedestal 22 are configured to coincide with each other.
Therefore, although the insertion portion 21 is disposed in the first member 10, the pedestal portion 22 is disposed outside the first member 10.

  The measurement assisting space 23 may be embedded in the second member 20 like the measurement assisting portion 12 like the measurement assisting space 13 provided in the first member 10, or is formed to communicate with the second member 20 outside. You may In the present embodiment, the diameter of the auxiliary measurement space 23 is formed to the same diameter as the auxiliary measurement space 13 of the first member 10, and when the first member 10 and the second member 20 are combined, the auxiliary measurement space 23 and the measurement auxiliary space 13 are arranged at a position where they are combined.

  Further, the dimensions of the first member 10 and the second member 20, and the positions and sizes of the measurement assisting portion 12 and the measurement assisting spaces 13 and 23 are also precisely described in the specification of the reference gauge main body C1. Comparison with measured data D is performed based on the dimensions described in this specification. For example, the shape, size, and position of the insertion portion 21, the pedestal portion 22, and the auxiliary measurement space 23 are reflected in the measurement data D (refer to the insertion portion data 21D, pedestal portion data 22D, and auxiliary auxiliary space data 23D in FIG. 1). By comparing with the dimensions described in the specifications of the reference gauge main body C, it is used for basic characteristic evaluation and calibration of the X-ray CT apparatus A.

Further, although not shown, a gap may be formed between the receiving portion 11 and the insertion portion 21 by forming a groove or a space on the surface (side surface or the like) of the insertion portion 21. That is, a groove or the like is formed between the top surfaces 111a and 112a of the receiving portion 11 and the upper surfaces 211a and 212a of the insertion portion 21 or between the inner peripheral surfaces 111b and 112b of the receiving portion 11 and the outer peripheral surfaces 211b and 212b of the insertion portion 21. You may form a space.
Thus, the gap formed between the receiving portion 11 and the insertion portion 21 can be used for comparison with the measurement data D, as in the measurement auxiliary space 23 and the like.

  As materials used for the first member 10 and the second member 20, metals such as aluminum, stainless steel, tungsten, ceramics, PE (polyethylene), nylon, PTFE (fluororesin, trade name Teflon (registered trademark)) Etc. can be illustrated. In addition to this, it is naturally possible to adopt a material that can be applied to all the materials to be measured by the X-ray CT apparatus A.

The reference gauge main body C according to the present invention comprises a first member 10 and a second member 20 detachable from the first member 10, and the first member 10 is a receptacle capable of receiving the second member 20. 11, the second member 20 is provided with the insertion portion 21 to be inserted into the receiving portion 11, and the first member 10 and the second member 20 are formed of different materials.
With such a configuration, the insertion portion 21 of the second member 20 is inserted into the receiving portion 11 of the first member 10, so the second member 20 is disposed in the first member 10 in the insertion portion. The measurement can be performed with the above configuration. That is, by inserting the insertion portion 21 into the receiving portion 11, the second member 20 formed of a material different from the first member 10 is disposed in the first member 10. Therefore, basic characteristic evaluation and calibration of the X-ray CT apparatus A can be performed with the same configuration as that of an industrial product (a configuration in which a pseudo built-in component is covered by an exterior component).

Further, according to the present invention, the first member 10 and / or the second member 20 is a member group consisting of a plurality of members formed of materials having different radiation absorption coefficients (the first member group 10G and / or the second It has member group 20G). Thus, by providing the first member 10 and / or the second member 20 having a member group consisting of a plurality of members, the combination of the first member 10 and the second member 20 can be selected and the user wants to verify A material corresponding to the material to be measured can be selected.
For example, FIG. 3 shows how the first member group 10G (first members 10A and 10B) and the second member group 20G (second members 20A and 20B) are appropriately selected and combined according to the material to be measured. It is shown.

  Further, according to the present embodiment, the outer shape of the reference gauge main body C1, the receiving portion 11, and the inserting portion 21 are each formed in a substantially prismatic shape. This makes it possible to evaluate the basic characteristics of the X-ray CT apparatus assuming a substantially prismatic object to be measured. That is, it is possible to evaluate the attenuation factor of X-rays with respect to the edge portion of the prismatic column, and to perform basic characteristic evaluation and calibration in a situation closer to the object to be measured of the substantially prismatic column.

Second Embodiment
Hereinafter, the reference gauge body C2 according to the second embodiment of the present invention will be described in detail with reference to FIGS. 6 and 8. The reference gauge main body C2 according to the second embodiment is characterized by having an outer shape different from that of the reference gauge main body C1 according to the first embodiment. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

  As in the first embodiment, the reference gauge main body C2 according to the second embodiment includes the first member 10 and the second member 20 attachable to and detachable from the first member 10. FIG. 6 shows a perspective view of a state in which the first member 10 and the second member 20 are combined. FIG. 7 shows an external view of the first member 10, and FIG. 8 shows an external view of the second member 20. As shown in FIG. The outer shape of the reference gauge main body C2 according to the second embodiment is formed in a substantially cylindrical shape as a whole.

The first member 10 has a receiving portion 11 capable of receiving the second member 20, and a measurement assisting portion 12 formed of materials having different absorption coefficients of radiation inside the member (in the first member 10) There is.
The receiving portion 11 is formed in a substantially cylindrical shape in conformity with the outer shape of the reference gauge main body C2, and has a small diameter upper cylindrical receiving portion 111 and a large diameter cylindrical lower receiving portion 112. And.
The measurement assisting portion 12 is a columnar pin material extending in the vertical direction, and is formed one by one at symmetrical positions around the axis of the first member 10.

The second member 20 is formed by providing a space in the insertion portion 21 inserted into the receiving portion 11, the pedestal portion 22 provided below the insertion portion 21, and the inside of the member (in the second member 20). And a measurement auxiliary space 23. Further, although not shown in the figure, the bottom surface of the pedestal 22 may have a fixing portion 24 fixed to the X-ray CT apparatus A described in the previous embodiment.
The insertion portion 21 is formed in a substantially cylindrical shape in conformity with the outer shape of the reference gauge main body C2, and the upper insertion portion 211 inserted into the upper receiving portion 111 and the lower insertion portion 212 inserted into the lower receiving portion 112 ,have. That is, the upper insertion portion 211 is formed in a small diameter cylindrical shape, and the lower insertion portion 212 is formed in a large diameter cylindrical shape.
The measurement auxiliary space 23 is formed in a cylindrical shape that communicates with the upper and lower sides of the second member 20.

  According to the present embodiment, the outer shape of the reference gauge main body C2, the receiving portion 11, and the inserting portion 21 are each formed in a substantially cylindrical shape. As a result, when measurement is performed while rotating around the axis of the reference gauge main body C2, the X-ray transmission distance can be kept constant at all times. That is, when the reference gauge body C2 is rotated about the axis, X-rays arriving at the same position of the X-ray detector A2 are always transmitted through the reference gauge body C2 by the same distance. Thereby, the attenuation factor etc. of the material can be measured accurately.

Embodiment 3
Hereinafter, the reference gauge main body C3 according to Embodiment 3 of the present invention will be described in detail with reference to FIG. 9 and FIG. The reference gauge main body C3 according to the third embodiment is characterized by having an outer shape different from that of the reference gauge main bodies C1 and C2 according to the first and second embodiments. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

As in the first and second embodiments, the reference gauge main body C3 according to the third embodiment includes the first member 10 and the second member 20 attachable to and detachable from the first member 10. FIG. 9 shows a perspective view of a state in which the first member 10 and the second member 20 are combined. FIG. 10 shows an external view of the first member 10, and FIG. 11 shows an external view of the second member 20. As shown in FIG. The outer shape of the reference gauge main body C3 according to the third embodiment is formed in a substantially elliptic cylindrical shape as a whole.
Further, although not shown in the figure, the bottom surface of the pedestal 22 may have a fixing portion 24 fixed to the X-ray CT apparatus A described in the previous embodiment.

The receiving portion 11 is formed in a substantially elliptic cylindrical shape in conformity with the outer shape of the reference gauge main body C3, and is formed into an elliptical cylindrical shape with a small diameter, and a lower cylindrical receiving portion 112 formed with a large diameter elliptical cylinder. And.
The insertion portion 21 is formed in a substantially elliptic cylindrical shape to match the outer shape of the reference gauge main body C 3, and the upper insertion portion 211 inserted into the upper receiving portion 111 and the lower insertion portion 212 inserted into the lower receiving portion 112. ,have. That is, the upper insertion portion 211 is formed in a small diameter elliptic cylinder, and the lower insertion portion 212 is formed in a large diameter oval cylinder.

  According to the present embodiment, the outer shape of the reference gauge main body C3, the receiving portion 11, and the inserting portion 21 are each formed in a substantially elliptic cylindrical shape. Thus, when measurement is performed while rotating around the axis of the reference gauge main body C3, the X-ray transmission distance can be changed by the rotation angle. That is, when the reference gauge main body C3 is rotated about the axis, the X-ray reaching the same position of the X-ray detector A2 has the transmission distance continuously changed due to the rotation angle. Thereby, the attenuation factor etc. of the material can be measured accurately.

Fourth Embodiment
Hereinafter, the reference gauge main body C4 according to the fourth embodiment of the present invention will be described in detail with reference to FIG. The reference gauge main body C4 according to the fourth embodiment is characterized in that the first member 10 and the second member have the same outer shape. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

  The reference gauge main body C4 according to the fourth embodiment includes the first member 10 and the second member 20 attachable to and detachable from the first member 10 as in the first to third embodiments. FIG. 12 shows a side view in which the first member 10 and the second member 20 are separated.

The first member 10 has a receiving portion 11 capable of receiving the second member 20 and a second insertion portion 14 inserted into the second member 20, and the second insertion portion 14 has a small diameter. The formed upper insertion portion 141 and the lower insertion portion 142 formed to have a large diameter are provided.
The upper insertion portion 141 has a top surface 141 a and an inner circumferential surface 141 b.
Since the lower insertion portion 142 is formed to have a diameter larger than that of the upper insertion portion 141, a top surface 142 a formed between the lower insertion portion 141 and the upper insertion portion 141, and an inner circumferential surface 142 b larger than the inner circumferential surface 141 b have.

The second member 20 has an insertion portion 21 inserted into the receiving portion 11 of the first member 10 and a second receiving portion 25 into which the second insertion portion 14 is inserted. An upper receiving portion 251 into which the upper insertion portion 141 is inserted and a lower receiving portion 252 into which the lower insertion portion 142 is inserted are provided at 25.
The upper receiving portion 251 has an upper surface 251a facing the top surface 141a and an outer peripheral surface 251b facing the inner peripheral surface 141b.
The lower receiving portion 252 is formed larger in diameter than the upper receiving portion 251, and has an upper surface 252a facing the top surface 142a and 252b facing the inner peripheral surface 142b.

  And the receiving part 11 and the 2nd receiving part 25 are formed in the same shape, and the insertion part 21 and the 2nd insertion part 14 are formed in the same shape. Therefore, the first member 10 and the second member 20 according to the present embodiment are configured in the same shape.

According to this embodiment, by forming the receiving portion and the inserting portion in each of the first member 10 and the second member 20, the measurement result of the second member 20 in the first member 10 and the inside of the second member 20 can be obtained. The measurement results of the first member 10 can be measured at the same time.
Further, by forming the first member 10 and the second member 20 in the same shape, the number of the first member group 10G and / or the second member group 20G can be reduced. That is, in the first to third embodiments, since the shapes of the first member 10 and the second member 20 are different, it is necessary to prepare materials for the first member 10 and the second member 20, respectively. According to the present embodiment, since the first member 10 can be diverted to the second member 20 or the second member 20 can be diverted to the first member 10 since they are formed in the same shape, the same material is used. The first member 10 and the second member 20 need not be prepared.

Fifth Embodiment
Hereinafter, a reference gauge main body C5 according to Embodiment 5 of the present invention will be described in detail with reference to FIG. The reference gauge main body C5 according to the fifth embodiment is characterized in that the first member 10 is provided with a liquid storage portion capable of containing a liquid. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

  As in the first to fourth embodiments, the reference gauge main body C5 according to the fifth embodiment includes the first member 10 and the second member 20 attachable to and detachable from the first member 10. FIG. 13 shows a side view in which the first member 10 and the second member 20 are separated.

The first member 10 has a receiving portion 11 capable of receiving the second member 20, and a liquid storage portion 15 capable of containing a liquid inside the member (in the first member 10).
The liquid storage portion 15 may be provided with a liquid introduction port 15 a communicating with the outside of the first member 10.

  As described above, by providing the liquid storage portion 15 in the first member 10, it is possible to cope with the measurement in the case where the object to be measured includes a fluid such as a liquid or a gel. Also, it is naturally possible to provide the second member 20 with a liquid storage portion.

Embodiment 6
Hereinafter, a reference gauge body C6 according to Embodiment 6 of the present invention will be described in detail with reference to FIG. The reference gauge main body C6 according to the sixth embodiment is characterized by further including a third member 30. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

  The reference gauge main body C6 according to the sixth embodiment is a second member in addition to the first member 10 and the second member 20 attachable to and detachable from the first member 10 shown in the first to fifth embodiments. And 20 a third member 30 which is detachable. FIG. 14 shows a side view in which the first member 10, the second member 20 and the third member 30 are separated.

  The reference gauge main body C6 according to the present embodiment further includes a third member 30 which is detachable from the second member 20. The third member 30 has a third receiving portion 31 capable of receiving the second member 20, and the second member 20 is disposed at the receiving portion 11 of the first member 10 and the third receiving portion 31 of the third member 30. As a result, it is accommodated so as to be sandwiched between the first member 10 and the third member 30.

The third member 30 has an upper surface 30a facing the lower surface 10c of the first member 10, an outer peripheral surface 30b coinciding with the outer peripheral surface 10b of the first member 10, and a lower surface 30c.
Further, although not shown in the figure, the lower surface 30c of the third member 30 may be provided with a fixing portion 24 fixed to the X-ray CT apparatus A described in the above embodiment.
Further, the third receiving portion 31 has an inner circumferential surface 31 a facing the outer circumferential surface 212 b of the lower insertion portion 212 and a bottom surface 31 b facing the lower surface 212 c of the lower insertion portion 212.

  According to the present embodiment, the measurement can be performed in a state in which the second member 20 is completely accommodated. Therefore, the measurement result of the second member 20 in the first member 10 and the measurement result of the second member in the third member 30 can be simultaneously measured. Therefore, a plurality of measurement results can be obtained simultaneously by forming the first member 10 and the third member 30 with materials having different absorption coefficients of radiation.

  The shapes of the receiving portion 11, the third receiving portion 31, and the second member 20 can be changed as appropriate. For example, it is also possible to form the second member 20 in the shape of a sphere, an oval, or the like, and to form the second member 20 in the acceptable receiving portion 11 and the third receiving portion 31.

Seventh Embodiment
Hereinafter, a reference gauge body C7 according to a seventh embodiment of the present invention will be described in detail with reference to FIGS. The reference gauge main body C7 according to the seventh embodiment is characterized in that it has a receiving portion and an inserting portion different in shape from those of the second embodiment. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

  The reference gauge main body C7 according to the seventh embodiment includes the first member 10 having the receiving portion 11 and the second member 20 having the insertion portion 21 insertable into the receiving portion 11 as in the second embodiment. And. FIG. 15 shows the appearance of the first member 10, and FIG. 16 shows the appearance of the second member 20. As shown in FIG. The outer shape of the reference gauge main body C7 according to the seventh embodiment is formed in a substantially cylindrical shape as a whole, and the receiving portion 11 and the insertion portion 21 are formed in a substantially elliptic cylindrical shape. In addition, in FIG.15 and FIG.16, although a mode that both the receiving part 11 and the insertion part 21 were formed in substantially elliptical columnar shape was shown, any one may be formed in substantially elliptical columnar shape.

  According to the present embodiment, the outer shape of the reference gauge main body C7 is formed in a substantially cylindrical shape, and the receiving portion 11 and / or the insertion portion 21 is formed in a substantially elliptic cylindrical shape, thereby changing the reference gauge The distance through which the X-ray X passes through the main body C7 can be changed continuously. This makes it possible to precisely measure the performance of the device with respect to the damping factor of the material of the reference gauge body C7.

Eighth Embodiment
Hereinafter, a reference gauge body C8 according to Embodiment 8 of the present invention will be described in detail with reference to FIGS. 17 and 18. The reference gauge main body C8 according to the eighth embodiment is characterized in that it has a receiving portion and an inserting portion different in shape from those of the second embodiment. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

  The reference gauge main body C8 according to the eighth embodiment includes the first member 10 having the receiving portion 11 and the second member 20 having the inserting portion 21 insertable into the receiving portion 11 as in the third embodiment. And. FIG. 17 shows the appearance of the first member 10, and FIG. 18 shows the appearance of the second member 20. As shown in FIG. The outer shape of the reference gauge main body C8 according to the eighth embodiment is formed in a substantially elliptic cylindrical shape as a whole, and the receiving portion 11 and the insertion portion 21 are formed in a substantially cylindrical shape. In addition, in FIG.17 and FIG.18, although a mode that both the receiving part 11 and the insertion part 21 were formed in substantially cylindrical shape was shown, any one may be formed in substantially cylindrical shape.

  According to the present embodiment, the outer shape of the reference gauge main body C8 is formed in a substantially elliptic cylindrical shape, and the receiving portion 11 and / or the insertion portion 21 is formed in a substantially cylindrical shape. The distance through which the X-ray X passes through the main body C7 can be changed continuously. This makes it possible to precisely measure the performance of the device with respect to the damping factor of the material of the reference gauge body C7.

  In the description of the reference gauge main body described above in the first to eighth embodiments, the use of the first member and the second member in combination has mainly been described, but the first member or the second member may be used alone. Naturally it is also possible to do.

<Embodiment 9>
Hereinafter, a reference gauge main body C9 according to Embodiment 9 of the present invention will be described in detail with reference to FIG. The ninth embodiment is characterized by including a reference gauge main body C9 formed in a tubular shape, the outer shape 41 is formed in a substantially cylindrical shape, and the inner shape 42 is formed in a substantially elliptical middle shape. That is, the measurement auxiliary space is formed in a substantially elliptic cylindrical shape.
The outer shape 41 has a first outer shape 411 formed to have a large diameter and a second outer shape 412 formed to have a small diameter. The inner shape 42 is disposed inside the first outer shape 411 and the second outer shape 412.
Further, although not shown in the figure, it may have a fixing portion 24 fixed to the X-ray CT apparatus A shown in the previous embodiment.

  According to the present embodiment, since the outer shape 41 of the reference gauge main body C9 is formed in a substantially cylindrical shape and the inner shape 42 is formed in a substantially elliptic cylindrical shape, the X-ray of the reference gauge main body C9 is performed along with the change of the rotation angle. The distance through which X passes can be varied continuously. This makes it possible to precisely measure the performance of the device with respect to the damping factor of the material of the reference gauge body C9.

Further, according to the present embodiment, by having the first outer shape 411 and the second outer shape 412 having different diameter sizes, measurement data of different transmission distances can be simultaneously obtained in one measurement.
Although FIG. 19 shows the cylindrical reference gauge main body C9 having the vertically penetrating holes, a hollow cylindrical tube having a top surface or a bottomed cylindrical tube having a bottom surface may be adopted.

<Embodiment 10>
Hereinafter, a reference gauge body C10 according to Embodiment 10 of the present invention will be described in detail with reference to FIG. The reference gauge main body C10 according to the tenth embodiment is characterized by having an outer shape and an inner shape which are different in shape from those of the ninth embodiment. In the second embodiment, the same reference numerals are given to components basically the same as the first embodiment and the description thereof will be simplified.

The reference gauge main body C10 according to the tenth embodiment includes a reference gauge main body C10 formed in a cylindrical shape, the outer shape 41 is formed in a substantially elliptic cylindrical shape, and the inner shape 42 is formed in a substantially circular middle shape It is characterized by That is, the measurement auxiliary space is formed in a substantially cylindrical shape.
The outer shape 41 has a first outer shape 411 formed to a large diameter, and a second outer shape 412 formed to a small diameter, and the inner shape 42 has a first inner shape 421 formed to a large diameter, and a small diameter And a second inner shape 422 formed in

A first inner shape 421 and a second inner shape 422 are arranged inside the first outer shape 411, and only a second inner shape 422 is arranged inside the second outer shape 412.
Further, although not shown in the figure, it may have a fixing portion 24 fixed to the X-ray CT apparatus A shown in the previous embodiment.

According to the present embodiment, the outer shape 41 of the reference gauge main body C10 is formed in a substantially elliptic cylindrical shape, and the inner shape 42 is formed in a substantially cylindrical shape. The distance through which X passes can be varied continuously. This makes it possible to precisely measure the performance of the device with respect to the damping factor of the material of the reference gauge body C10.
In addition, in FIG. 20, although the cylindrical reference gauge main body C10 which has a hole which penetrates up and down is shown, you may employ | adopt a bottomed cylindrical shape which has a top surface cylindrical shape and a bottom face.

  Further, in the description of the reference gauge main body described above in the ninth and tenth embodiments, the outer shape 41 of the two-stage configuration and the inner shape 42 of the one-stage structure and the two-stage configuration are shown. It is naturally possible to do.

C1 to C10 Reference gauge main body 10 first member 10G first member group 11 receiving portion 12 measurement auxiliary portion 13 measurement auxiliary space 14 second insertion portion 20 second member 20G second member group 21 insertion portion 22 pedestal portion 23 measurement auxiliary space 24 fixed part 25 second receiving part 30 third member 31 third receiving part A X-ray CT apparatus A1 X-ray source A2 X-ray detector A3 pedestal for position adjustment A4 rotation table A5 moving table D measurement data

Claims (16)

A reference gauge body having a first member and a second member removably mounted on the first member,
The first member is provided with a receiver capable of receiving the second member,
The second member is provided with an insertion portion to be inserted into the receiving portion,
A reference gauge for an X-ray CT apparatus, wherein the first member and the second member are formed of different materials.   The X-ray CT apparatus according to claim 1, wherein the first member and / or the second member includes a member group including a plurality of members formed of materials having different absorption coefficients of radiation. Reference gauge.   The X-ray according to claim 1 or 2, wherein the first member and / or the second member has a measurement assisting portion formed of materials having different absorption coefficients of radiation inside the member. Standard gauge for CT equipment.   The reference gauge for X-ray CT apparatus according to any one of claims 1 to 3, wherein the first member and / or the second member has a measurement auxiliary space inside the member.   The reference gauge for X-ray CT apparatus according to any one of claims 1 to 4, wherein an outer shape of the reference gauge body is formed in a substantially prismatic shape.   The X-ray CT apparatus reference gauge according to any one of claims 1 to 4, wherein an outer shape of the reference gauge body is formed in a substantially cylindrical shape.   The X-ray CT apparatus reference gauge according to any one of claims 1 to 4, wherein an outer shape of the reference gauge body is formed in a substantially elliptic cylindrical shape. The outer shape of the reference gauge body is formed in a substantially cylindrical shape,
The reference gauge for an X-ray CT apparatus according to any one of claims 1 to 4, wherein the receiving portion and / or the insertion portion is formed in a substantially elliptic cylindrical shape. The outer shape of the reference gauge body is formed in a substantially elliptic cylindrical shape,
The reference gauge for an X-ray CT apparatus according to any one of claims 1 to 4, wherein the receiving portion and / or the insertion portion is formed in a substantially cylindrical shape. The second member is further provided with a second receiving portion for receiving the first member,
The first member is further provided with a second insertion portion to be inserted into the second receiving portion,
The receiving portion and the second receiving portion are formed in the same shape,
The X-ray CT apparatus reference gauge according to any one of claims 1 to 9, wherein the insertion portion and the second insertion portion are formed in the same shape.   The reference gauge for an X-ray CT apparatus according to any one of claims 1 to 10, wherein the first member and / or the second member has a liquid storage portion capable of containing a liquid inside the member. . The reference gauge main body further includes a third member detachably attachable to the second member,
The third member has a third receptacle capable of receiving a second member,
The reference gauge for an X-ray CT apparatus according to any one of claims 1 to 11, wherein the second member is received by the receiving portion and the third receiving portion.   The reference gauge for an X-ray CT apparatus according to claim 12, wherein the third member comprises a plurality of member groups formed of materials having different absorption coefficients of radiation. It has a cylindrical reference gauge body,
The outer shape is formed in a substantially cylindrical shape,
A reference gauge for an X-ray CT apparatus, wherein the inner shape is formed in a substantially elliptical shape. It has a cylindrical reference gauge body,
The outer shape is formed in a substantially elliptical shape,
A reference gauge for an X-ray CT apparatus, wherein the inner shape is formed in a substantially circular shape. A calibration method of an X-ray CT apparatus using the reference gauge for an X-ray CT apparatus according to any one of claims 1 to 15,
The X-ray CT apparatus comprises: an X-ray source for emitting X-rays; an X-ray detector disposed facing the X-ray source; and the X-ray source disposed between the X-ray source and the X-ray detector. And a pedestal for adjusting the position of the reference gauge for the X-ray CT apparatus;
The position adjustment pedestal has a rotary table for rotating the X-ray CT apparatus reference gauge, and a movable table for moving the X-ray CT apparatus reference gauge in parallel with the X-ray irradiation direction,
The moving step of moving the X-ray CT apparatus reference gauge using the position adjustment pedestal, the measurement process of obtaining measurement data of the X-ray CT apparatus reference gauge, and each measurement condition using the measurement data And a calibration step of calibrating the X-ray CT apparatus.