WO2016092780A1 - Appareil ct de mammographie - Google Patents

Appareil ct de mammographie Download PDF

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Publication number
WO2016092780A1
WO2016092780A1 PCT/JP2015/006003 JP2015006003W WO2016092780A1 WO 2016092780 A1 WO2016092780 A1 WO 2016092780A1 JP 2015006003 W JP2015006003 W JP 2015006003W WO 2016092780 A1 WO2016092780 A1 WO 2016092780A1
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WO
WIPO (PCT)
Prior art keywords
gantry
radiation
mammography
radiation source
breast
Prior art date
Application number
PCT/JP2015/006003
Other languages
English (en)
Inventor
Wataru Kaku
Sakiko Yamaguchi
Takahiro Noguchi
Hitomi Ogasawara
Kazuhiro Watanabe
Original Assignee
Canon Kabushiki Kaisha
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Application filed by Canon Kabushiki Kaisha filed Critical Canon Kabushiki Kaisha
Publication of WO2016092780A1 publication Critical patent/WO2016092780A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/502—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for diagnosis of breast, i.e. mammography

Definitions

  • the present invention relates to a mammography CT apparatus that radiographs a breast of an object by using radiation.
  • a mammography CT apparatus that radiographs a breast by irradiating the breast with radiation while rotating a radiation source and a radiation detector, which are disposed in a gantry so as to oppose each other, around the breast is available.
  • the gantry of the mammography CT apparatus is provided with an opening portion that allows a breast of an object to be exposed at a location between the radiation source and the radiation detector.
  • the radiation source and the radiation detector rotate around the breast exposed from the opening portion to radiograph the breast (refer to, for example, PTL 1).
  • an object needs to maintain a posture on a planar gantry. Therefore, the head or the waist of the object is subjected to pressure at the planar gantry. This sometimes makes it difficult for the object to maintain the posture.
  • the present invention is carried out to overcome the above-described problem.
  • the present invention provides a mammography CT apparatus that allows the object to easily maintain the posture and the breast to be radiographed.
  • a mammography CT apparatus that radiographs a breast of an object.
  • the mammography CT apparatus includes a gantry where a radiation source and a radiation detector are disposed so as to oppose each other.
  • the gantry includes an inclined portion that is inclined in a form of a cone and a planar portion that is formed along an end portion of the inclined portion, the planar portion having an opening portion into which the breast of the object is inserted.
  • the gantry is shaped like a truncated cone.
  • the opening portion into which the breast of the object is inserted is provided at an upper surface of the truncated cone.
  • the mammography CT apparatus allows an object to easily maintain a posture and a breast to be radiographed.
  • Fig. 1A is an external view of a mammography CT apparatus according to a first embodiment of the present invention.
  • Fig. 1B is another external view of the mammography CT apparatus according to the first embodiment of the present invention.
  • Fig. 2 illustrates a structure of the mammography CT apparatus according to the first embodiment of the present invention.
  • Fig. 3 illustrates a structure of a radiation source of the mammography CT apparatus according to the present invention.
  • Fig. 4 illustrates a state in which an object is being radiographed at the mammography CT apparatus according to the present invention.
  • Fig. 5 illustrates a state in which the object is being radiographed at the mammography CT apparatus according to the present invention.
  • Fig. 1A is an external view of a mammography CT apparatus according to a first embodiment of the present invention.
  • Fig. 1B is another external view of the mammography CT apparatus according to the first embodiment of the present invention.
  • Fig. 2 illustrates a structure of the mamm
  • Fig. 6 is an external view of a mammography CT apparatus according to a second embodiment of the present invention.
  • Fig. 7A is an external view of a mammography CT apparatus according to a third embodiment of the present invention.
  • Fig. 7B is a sectional view of the mammography CT apparatus along a broken line VIIB-VIIB.
  • Fig. 8A is another external view of the mammography CT apparatus according to the third embodiment of the present invention.
  • Fig. 8B is a sectional view of the mammography CT apparatus along a broken line VIIIB-VIIIB.
  • Fig. 9 is an external view of a mammography CT apparatus according to a fourth embodiment of the present invention.
  • Figs. 1A and 1B are each an external view of a mammography CT apparatus according to a first embodiment of the present invention.
  • Fig. 1A is an external view of the mammography CT apparatus, and illustrates a gantry 10 and a bed 20.
  • the gantry 10 is provided with a radiation source and a radiation detector in its interior.
  • the bed 20 supports an object P.
  • Fig. 1B illustrates a state in which the object P lies face down on the gantry 10 and the bed 20.
  • the gantry 10 is provided with, in its interior, the radiation source that generates radiation, and the radiation detector that detects the radiation generated from the radiation source. As illustrated in Figs. 1A and 1B, the gantry 10 has an annular shape. Part of the gantry 10 is a truncated cone. The gantry 10 is hollow. An opening portion 15 is provided at a planar portion 14 corresponding to an upper end of the gantry 10. That is, the upper end of the gantry 10 including the truncated cone in which the opening portion 15 is provided is a planar surface.
  • the gantry 10 has a truncated cone 11 and a cylindrical portion 12.
  • the truncated cone 11 and the cylindrical portion 12 are each hollow.
  • a lower surface of the truncated cone 11 is joined to an upper surface of the cylindrical portion 12.
  • a joining surface of the truncated cone 11 and a joining surface of the cylindrical portion 12 join hollow portions in the interior of the gantry 10.
  • the truncated cone 11 of the gantry 10 includes an inclined portion 13 having a conical inclined surface and a planar portion 14 (upper surface of the truncated cone 11).
  • the gantry 10 includes the inclined portion 13 that is inclined in the form of a cone, and the planar portion 14 that is formed along an end portion of the inclined portion 13.
  • the opening portion 15 into which the breast of the object P is inserted is provided at the planar portion 14.
  • the gantry 10 has a convex shape formed by the inclined portion 13 and the planar portion 14.
  • the object P is placed on the inclined portion 13 and the planar portion 14 of the gantry 10.
  • the end portion of the inclined portion 13 has the form of a concentric circle.
  • the planar portion 14 is provided along the concentric circle of the inclined portion 13. That is, the planar portion 14 is concentrically provided along the inclined portion 13.
  • the planar portion 14 is formed with a size where a standard body shape is assumed. More specifically, it is desirable that the diameter width of the planar portion 14 be greater than the shoulder width of the object P.
  • the diameter width of the planar portion 14 is greater than the diameter width of the opening portion 15, and is less than the diameter width of a concentric circle that is formed by the inclined portion 13.
  • the diameter width of the planar portion 14 is, for example, in the range of from 80 cm to 120 cm.
  • the opening portion 15 into which the breast of the object P is inserted is provided in the vicinity of the center of the planar portion 14.
  • the mammography CT apparatus includes the bed 20 for placing the object P thereon.
  • the bed 20 is provided so as to contact a side surface of the gantry 10.
  • a side surface of the bed 20 is curved in accordance with the cylindrical shape (cylindrical portion 12) of the gantry 10.
  • the height of the cylindrical portion 12 and the height of the bed 20 are the same.
  • a top plate of the bed 20 is joined to the inclined portion 13 of the gantry 10.
  • the object P lies face-down on the gantry 10 and the bed 20, and the breast of the object P is exposed from the opening portion 15 to allow the breast to be radiographed by the mammography CT apparatus.
  • the object P gets onto the bed 20, and lies face-down on the bed 20 from the gantry 10 while inserting either the left breast or the right breast into the opening portion 15.
  • the object and the waist of the object is placed on the gantry 10 including the conical inclined surface.
  • the position of the opening portion 15 into which one of the breasts of the object P has been inserted is highest. From there, at a side of the head of the object P, the gantry 10 is inclined downwardly and forwardly from the object P, and, at a side of the waist of the object P, the gantry 10 is inclined downwardly and backwardly from the object P.
  • the legs of the object P are supported by the bed 20, and the waist of the object P is supported by the inclined portion 13.
  • the upper half of the body of the object P is supported by the planar portion 14.
  • the arms of the object P are supported by the inclined portion 13.
  • the head of the object P is supported by the inclined portion 13. That is, since, the waist, the arms, and the head of the object P are supported by the inclined surface (inclined portion 13) of the gantry 10, the object P can easily maintain the face-down lying posture.
  • the object P can maintain the face-down lying posture without the head or waist being pressed against the gantry 10 and being subjected to pressure.
  • the human body is, structurally speaking, such that movable angles of the head and the waist when they are forwardly bent are greater than movable angles of the head and the waist when they are backwardly bent.
  • the object P When the object P is in the face-down lying posture, the object P can place the arms around the convex-shaped gantry 10 (inclined portion 13) so as to embrace the gantry 10. Therefore, the object P can be positioned in a more comfortable posture.
  • Fig. 2 illustrates an internal structure of the gantry 10 of the mammography CT apparatus.
  • the mammography CT apparatus is provided with a radiation source 104 that generates radiation, a radiation detector 105 that detects the radiation generated from the radiation source 104, an arm 106 that connects the radiation source 104 and the radiation detector 105 to each other, a rotation driving unit 107 that rotates the arm 106 around a rotation axis C, a controller 108 that controls each structural element of the mammography CT apparatus, and a power source unit 111 that supplies electrical power to each structural element of the mammography CT apparatus.
  • the object P lies face-down from the gantry 10 to the bed 20.
  • a breast S of the object P is inserted into the opening portion 15 of the gantry 10.
  • the breast S of the object P is disposed at a location between the radiation source 104 and the radiation detector 105.
  • the gantry 10 is formed with an annular shape around the rotation axis C that extends through the center of the opening portion 15 and in a perpendicular direction.
  • Fig. 2 is a sectional view in which a cross section includes the rotation axis C of the gantry 10.
  • the radiation source 104 and the radiation detector 105 are disposed so as to oppose each other at two sides of the rotation axis C in the interior of the gantry 10 having an annular structure.
  • the radiation detector 105 is capable of detecting the radiation emitted by the radiation source 104.
  • the radiation source 104 and the radiation detector 105 are connected to each other by the arm 106.
  • the arm 106 is rotationally driven around the rotation axis C by the rotation driving unit 107. Therefore, it is possible to rotate the radiation source 104 and the radiation detector 105 while the radiation source 104 and the radiation detector 105 oppose each other.
  • the controller 108 controls, for example, the rotation of the arm 106 at the rotation driving unit 107, the application of radiation of the radiation source 104, the detection of radiation by the radiation detector 105, and the output of image data.
  • the controller 108 includes a CPU and a memory in its interior. The CPU executes a control program stored in the memory, to control each structural element. More specifically, the controller 108 controls the speed of rotation of the arm 106 per second at the rotation driving unit 107.
  • the rotation driving unit 107 is capable of rotating the arm 106 at this speed of rotation.
  • the controller 108 also controls radiography conditions including a tube voltage and a tube current at the radiation source 104.
  • the radiation source 104 is capable of applying radiation under such radiography conditions.
  • the controller 108 controls the timing of acquiring image data based on the radiation and detection of radiation by the radiation detector 105.
  • the radiation detector 105 may have the function of automatically detecting the application of radiation from the radiation source 104.
  • the automatic detection function is a function in which, when radiation is applied from the radiation source 104, the radiation detector 105 detects the radiation and accumulates radiation signals.
  • the controller 108 causes the radiation detector 105 to start an actual reading operation and acquire image data.
  • the power source unit 111 supplies electric power to each structural element.
  • the power source unit 111 supplies electric power to the radiation source 104.
  • the radiation source 104 is capable of applying radiation on the basis of a tube voltage or a tube current of the electric power supplied from the power source unit 111.
  • Fig. 3 illustrates a structure of the radiation source 104 of the mammography CT apparatus.
  • the radiation source 104 includes a radiation tube housing 201, an electron emission source 202, an anode 203, a target 2031, and a radiation transmission window 204.
  • the radiation source 104 is hermetically sealed by the radiation tube housing 201, and includes, in its interior, the electron emission source 202 that generates electrons, the anode 203, and the target 2031.
  • the radiation tube housing 201 includes the radiation transmission window 204 that allows radiation generated by the target 2031 to pass therethrough to the outside of the radiation tube housing 201.
  • the radiation tube housing 201 is a cylindrical container formed of a metal, and its interior is maintained in a vacuous state.
  • the electron emission source 202 includes a cathode 2021, a converging electrode 2022, and a grid electrode 2023.
  • the cathode 2021 generates heat as a result of supply of electric power to generate electrons.
  • the electrons generated by the cathode 2021 are emitted towards the anode 203 due to a potential difference between the cathode 2021 and the anode 203.
  • the electrons pass through an electron lens that is formed by a focus aperture 2024 of the focusing electrode 2022 and the grid electrode 2023, and is converged into a circular electron beam.
  • the target 2031 is a member that generates radiation as a result of collision of the electrons.
  • the target 2031 is formed by evaporation on a surface of the anode 203 with which the electron beam collides, and is kept at a ground potential.
  • the interior of the anode 203 has a hollow structure such that it can be cooled by a water cooling system.
  • the surface of the anode 203 where the target 2031 has been formed by evaporation is inclined by a predetermined angle with respect to a path (broken line 205) of the electron beam.
  • the electron beam is incident upon the target 2031 at this inclination angle.
  • the broken line 205 represents a direction of application of the electron beam.
  • the radiation transmission window 204 is formed in a direction of reflection of the electron beam.
  • the radiation transmission window 204 is a plate member formed of a material, such as beryllium, that allows radiation to pass therethrough.
  • a circular hole in the radiation tube housing 201 is brazed with the radiation transmission window 204 so as to cover the circular hole.
  • the radiation that is emitted from the target 2031 is transmitted through the radiation transmission window 204, so that the radiation is formed into a conical beam (area surrounded by broken lines 206), and the conical beam is applied towards the outside of the radiation tube housing 201. That is, the emission angle/shape of the radiation beam is determined by, for example, the angle of incidence of the electron beam with respect to the target and the shape/position of the radiation transmission window.
  • the radiation source 104 has a cylindrical shape as a whole, and applies conical radiation from an end portion of the radiation source 104 obliquely upward with respect to a longitudinal direction of the radiation tube housing 201 (direction of the electron beam).
  • the radiation source 104 may be a transmission radiation source. More specifically, the radiation source 104 includes a transmission target, an electron emission source that is disposed so as to be separated from and oppose the transmission target, and a radiation tube housing in which the pressure in its internal space is reduced. The electrons emitted from the electron emission source are applied towards the transmission target. When the electron emission source applies an electron beam to the transmission target, radiation can be generated. Even if the radiation source 104 is a transmission radiation source, the radiation source 104 is capable of applying conical radiation.
  • the radiation source 104 may have what is called a mono-tank structure in which a radiation tube for generating radiation and a high-voltage generating unit for operating the radiation tube are integrated with each other.
  • Figs. 4 and 5 each illustrate a state in which a breast of an object P is being radiographed by the mammography CT apparatus (a state in which radiation is being applied to the breast).
  • the radiation source 104 is disposed along the inclined surface (inclined portion 13) of the gantry 10. Even if the radiation source 104 rotates around the rotation axis C, the radiation source 104 does not collide with the inclined surface of the gantry 10. More specifically, the radiation source 104 is disposed along the inclined surface of the gantry 10 such that the radiation source 104 is parallel to the inclined surface (inclined portion 13) of the truncated cone shaped gantry 10. In other words, the inclined surface (inclined portion 13) of the gantry 10 is parallel to a longitudinal direction of the radiation source 104. It can be said that the inclined surface (inclined portion 13) of the gantry 10 is parallel to the direction of application of the electron beam that is generated from the electron emission source of the radiation source 104.
  • the inclined surface (inclined portion 13) of the gantry 10 is not parallel to the direction of application of radiation at the radiation source 104.
  • a planar-portion-14-side side surface of the radiation source 104 is a parallel surface.
  • the planar-portion-14-side side surface (planar surface) of the radiation source 104 is parallel to the planar portion 14 of the gantry 10.
  • a planar-portion-14-side end portion of the radiation that is applied from the radiation source 104 is parallel to the planar portion 14 of the gantry 10. That is, the radiation that is applied from the radiation source 104 is applied along the planar portion 14 of the gantry 10.
  • Symbol X denotes an application region of radiation that is emitted in the shape of a cone from the radiation source 104.
  • the radiation that is emitted from the radiation source 104 is applied such that a boundary surface at an upper side (planar-portion-14 side) of the application region X is substantially flush with an opening surface of the opening portion 15. That is, an angle ⁇ that is formed between the boundary plane of the application region X and a longitudinal axis of the radiation source 104 is substantially equal to an angle ⁇ formed by the inclined portion 13 of the gantry 10 and the opening surface of the opening portion 15.
  • the truncated cone shaped gantry 10 is formed such that its inclined side surface is formed substantially at the angle ⁇ with respect to the opening surface of the opening portion that is situated at a location corresponding to an apex of the gantry 10.
  • the angle ⁇ is an angle that is formed between the longitudinal axis of the radiation source 104 and an application boundary plane that is closer to an axis of the application region X of the radiation.
  • the angle ⁇ is an angle that is formed between the longitudinal axis of the radiation source 104 and the planar portion 14 of the gantry 10.
  • the angle ⁇ is an angle that is formed between the planar portion 14 of the gantry 10 and an axis along the direction of application of the electron beam that is generated from the electron emission source of the radiation source 104.
  • the radiation detector 105 is disposed so as to oppose the radiation source 104 with the rotation axis C in between.
  • the radiation source 104 and the radiation detector 105 are connected to each other by the arm 106.
  • the arm 106 is rotationally driven around the rotation axis C by the rotation driving unit 107.
  • the radiation detector 105 detects radiation that has passed through an object by using a photoelectric transducer, and outputs the radiation as an electrical signal.
  • the radiation detector 105 includes a conversion panel that detects radiation that has passed through the object, an absorbing plate that absorbs back scattered radiation, an electricity storage unit, and an interface (I/F) for outputting information converted into an electrical signal from the radiation.
  • the interface (I/F) allows an electrical signal to be output to an external device.
  • a grid that removes scattered radiation produced by the object may be provided at a radiation detection side of the radiation detector 105.
  • a radiation intercepting unit 301 is provided at an opposite side of the rotation axis C at the radiation detector 105 (that is, a side opposite to a detection surface of radiation. Therefore, it is possible to reduce unnecessary exposure of objects other than the object P to radiation.
  • the radiation source 120 when a radiation source 120 has a mono-tank structure, the radiation source 120 has a shape that is suitable for the inclined surface of the gantry 10. More specifically, the radiation source 120 is shaped in accordance with the shape of the interior of the gantry 10 including the inclined portion 13 and the planar portion 14. The radiation source 120 is bent in an L shape.
  • the radiation source 120 is formed along an inside wall of the inclined portion and an inside wall of the planar portion 14. More specifically, a planar-portion-14-side side surface of the radiation source 120 is parallel to the planar portion 14 of the gantry 10, and has a planar shape. Part of the radiation tube housing of the radiation source 120 is parallel to the inclined portion 13 of the gantry 10. In addition, part of the radiation tube housing of the radiation source 120 is parallel to a direction of the rotation axis C that is situated between the radiation source 104 and the radiation detector 105.
  • a target of the radiation source 120 is provided near the planar portion 14 of the gantry 10.
  • the inclined surface of the gantry 10 is parallel to a direction of application of an electron beam that is generated from an electron emission source of the radiation source 120.
  • a planar-portion-14-side end portion of the radiation that is applied from the radiation source 120 is parallel to the planar portion 14 of the gantry 10. That is, the radiation that is applied from the radiation source 120 is applied along the planar portion 14 of the gantry 10.
  • the mammography CT apparatus radiographs a tomographic image of a breast by applying radiation to the breast while the radiation source 104 (120) and the radiation detector 105 rotates around the breast. Portions that do not exist in the application region X of radiation cannot be radiographed. Since the portion where breast cancer most commonly occurs is at an outer side of an upper portion of the breast, it is desirable that the breast be radiographed including this portion.
  • the boundary plane of the application region X of radiation substantially corresponds to the opening surface, the breast can be radiographed including the portion where breast cancer most commonly occurs.
  • the mammography CT apparatus includes a gantry 10 where a radiation source 104 and a radiation detector 105 are disposed so as to oppose each other.
  • the gantry 10 includes an inclined portion 13 that is inclined in a form of a cone and a planar portion 14 that is formed along an end portion of the inclined portion 13, the planar portion 14 having an opening portion 15 into which the breast of the object P is inserted.
  • the gantry 10 is shaped like a truncated cone.
  • the opening portion 15 into which the breast of the object P is inserted is provided at the upper surface of the truncated cone.
  • the object P can easily maintain a face-down lying posture and the breast can be radiographed.
  • the object P lies face-down, the head or waist is not subjected to pressure, as a result of which the object P feels less pain. Consequently, it is possible to provide a mammography CT apparatus that is suitable for examining a breast and that is capable of radiographing the breast.
  • Fig. 6 is an external view of a mammography CT apparatus according to a second embodiment of the present invention.
  • the second embodiment differs from the first embodiment in that a side-surface opening portion 401 is provided at a peripheral edge of a gantry 10.
  • Fig. 6 illustrates a state in which, when an object P lies face-down on the gantry 10 of the mammography CT apparatus according to the present invention, the side-surface opening portion 401 of the gantry 10 is not covered for extracting a biopsy tissue sample of the object P or for treating the object P.
  • a breast of the object P can be subjected to three-dimensional radiation radiography, so that it is possible to determine the location of a tissue where the existence of a legion is suspected in three-dimensional coordinates.
  • a biopsy tissue sample can be extracted while the state of the breast of the object P is maintained after taking radiographs, it is possible to increase the precision with which the breast is examined while reducing the examination time.
  • treatment such as puncturing
  • the side-surface opening portion 401 is provided in the peripheral edge of the gantry 10.
  • the side-surface opening portion 401 in the peripheral edge of the gantry 10 can be covered and uncovered.
  • a cover (not shown) for covering the side-surface opening portion 401, it is possible to cover the side-surface opening portion 401 as shown in Fig. 1.
  • the cover for covering the side-surface opening portion 401 has the same size as the side-surface opening portion 401, and has the same shape as the gantry 10.
  • a side-surface opening portion 401 may be provided in either the left side or the right side of the gantry 10, or side-surface opening portions 401 may be provided in the left and right sides of the gantry 10. That is, one side-surface opening portion 401 may be provided in the gantry 10, or a plurality of side-surface opening portions 401 may be provided in the gantry 10.
  • the side-surface opening portion 401 may be used not only for extracting a biopsy tissue sample after taking radiographs, but also for correcting the position of a breast of the object P by a procedure performed by, for example, an examination technician before taking radiographs.
  • the controller 108 may control the radiation source 104 and the radiation detector 105 such that they stop at locations that are situated away from the side-surface opening portion 401. That is, the controller 108 controls the radiation source 104 and the radiation detector 105 so as not to stop at the side-surface opening portion 401.
  • a covering/uncovering sensor is provided at the side-surface opening portion 401.
  • the radiation source 104 and the radiation detector 105 may be controlled so as to move to locations that are situated away from the side-surface opening portion 401.
  • the covering/uncovering sensor when the covering/uncovering sensor is a contact sensor, the covering/uncovering sensor detects whether or not the cover for covering the side-surface opening portion 401 is in contact with the side-surface opening portion 401.
  • the controller 108 determines that the side-surface opening portion 401 is covered.
  • the controller 108 determines that the side-surface opening portion 401 is not covered.
  • the covering/uncovering sensor When the covering/uncovering sensor is an illuminance sensor, the covering/uncovering sensor detects whether or not the interior of the gantry 10 is dark. When the illuminance sensor has detected that the interior of the gantry 10 is dark, the illuminance sensor determines that the side-surface opening portion 401 is covered by the cover. At this time, the controller 108 determines that the side-surface opening portion 401 is covered. When the illuminance sensor has detected that the interior of the gantry 10 is bright, the illuminance sensor determines that the side-surface opening portion 401 is not covered by the cover. At this time, the controller 108 determines that the side-surface opening portion 401 is not covered.
  • the controller 108 prohibits the application of radiation by the radiation source 104.
  • the controller 108 stops the rotationally driving of the radiation source 104 and the radiation detector 105 by the rotational driving unit 107.
  • the controller 108 allows the rotational driving unit 107 to cause the radiation source 104 to apply radiation.
  • the controller 108 allows the radiation source 104 and the radiation detector 105 to be rotationally driven by the rotational driving unit 107.
  • the mammography CT apparatus may include a raising-and-lowering mechanism (not shown) that raises and lowers the gantry 10.
  • a raising-and-lowering mechanism (not shown) that raises and lowers the gantry 10.
  • the bed 102 is also capable of being raised and lowered, and the controller 108 controls the amount by which the bed 102 is raised and lowered such that it is substantially the same as the amount by which the gantry 10 is raised and lowered.
  • the object P can be positioned in a comfortable posture without the head or the waist of the object P being subjected to pressure as a result of the head or the waist being pressed against the device.
  • a side-surface opening that can be covered and uncovered is provided in a side surface of the gantry, for example, a biopsy tissue sample can be extracted and an examination technician or the like can perform a procedure through the side-surface opening.
  • Figs. 7A to 8B are external views or sectional views of a mammography CT apparatus according to a third embodiment of the present invention.
  • the third embodiment differs from the first and second embodiments in that grasp portions 30 or grasp portions 40 that an object P grasps are provided at a peripheral edge of a gantry 10 of the mammography CT apparatus.
  • the grasp portions 30 or the grasp portions 40 are provided at the peripheral edge (outer periphery) of a cylindrical portion 12 of the gantry 10.
  • the grasp portions 30 and 40 are not provided at an inclined portion 13 of the gantry 10.
  • Fig. 7A is an external view of the mammography CT apparatus is provided with the grasp portions 30.
  • Fig. 7B is a sectional view of the mammography CT apparatus along a broken line VIIB-VIIB.
  • two grasp portions 30 are provided on the gantry 10 so as to be symmetrically formed on two sides of an opening portion 15. That is, the two grasp portions 30 are provided on the gantry 10 so as to be symmetrically formed on two sides of a body axis of the object P who is placed on the gantry 10 and a bed 20.
  • the grasp portions 30 are curved along the shape of the gantry 10. More specifically, the grasp portions 30 are curved along the shape of the outer edge (outer periphery) of the gantry 10. With the distance between each grasp portion 30 and the gantry 10 being maintained at a constant distance, the grasp portions 30 are provided on the gantry 10. In order not to allow the grasp portions 30 to contact the waist of the object P, the grasp portions 30 are not provided at a bed-20 side of the gantry 10. The two grasp portions 30 may be connected at a side surface of the gantry 10 opposite to the bed-20 side of the gantry 10.
  • the object P When the object P is lying face-down, the arms of the object P are placed on the inclined portion 13 of the gantry 13 so as to embrace the gantry 10. Then, the object P grasps the grasp portions 30. Therefore, the object P is capable of stably maintaining the face-down lying posture by grasping the grasp portions 30.
  • Fig. 8A is an external view of the mammography CT apparatus provided with the grasp portions 40.
  • Fig. 8B is a sectional view of the mammography CT apparatus along a broken line VIIIB-VIIIB.
  • Recessed portions are provided in the peripheral edge (outer periphery) of the gantry 10.
  • the recessed portions function as the grasp portions 40 that an object grasps. More specifically, the recessed portions (grooved portions) are formed as the grasp portions 40 in a peripheral direction of a side surface of the gantry 10.
  • two grasp portions 40 are provided in the gantry 10 so as to be symmetrically formed on two sides of the opening portion 15. That is, the two grasp portions 40 are provided in the gantry 10 so as to be symmetrically formed on two sides of the body axis of the object P who is placed on the gantry 10 and the bed 20.
  • the two grasp portions 40 may be connected to each other.
  • the object P When the object P is lying face-down, the arms of the object P are placed on the inclined portion 13 of the gantry 13 so as to embrace the gantry 10. Then, the object P grasps the grasp portions 40. Therefore, the object P is capable of stably maintaining the face-down lying posture by grasping the grasp portions 40.
  • Fig. 9 is an external view of a mammography CT apparatus according to a fourth embodiment of the present invention.
  • the fourth embodiment differs from the first to third embodiments in that the mammography CT apparatus includes a rotating mechanism that rotates a gantry 10.
  • the mammography CT apparatus is assumed as being disposed in an xy plane.
  • the mammography CT apparatus includes a rotating mechanism (gantry rotating unit 56) that rotates the gantry 10. More specifically, the mammography CT apparatus includes a base 50 that is provided on a floor surface along a direction xy and a support base 52 that is connected to the base 50 and that is provided along a direction z.
  • a movable table 54 that is movable along a vertical direction (direction z) is provided at the support base 52.
  • a gantry rotating unit 56 for rotating the gantry 10 is provided at the movable table 54.
  • the area of a flat portion 14 (upper surface of a truncated cone) in the mammography CT apparatus according to this embodiment is greater than the area of an inclined portion 13.
  • the area of the planar portion 14 (upper surface of the truncated cone) is greater than 1.5 times the area of the inclined portion 13. Therefore, the entire upper half of the body of an object P can contact the planar portion 14.
  • the movable table 54 positions the gantry 10 in the vertical direction (direction z).
  • the gantry rotating unit 56 is capable of rotating the gantry 10 around a rotation axis that is parallel to an axis x in accordance with a radiography posture of the object P.
  • a breast of the object P is placed at substantially the center of a front surface portion of the gantry 10, and an angle of the front surface portion of the gantry 10 is set such that the front surface portion of the gantry 10 opposes the chest of the object P.
  • the movable table 54 and the gantry rotating unit 56 it is possible to perform tomography of the breast while the object P is positioned in any radiography posture, such as from a standing posture to an oblique posture to a face-down lying posture. This allows the breast of the object P to be radiographed while the burden on the object P is reduced.

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  • Health & Medical Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
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  • High Energy & Nuclear Physics (AREA)
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  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Apparatus For Radiation Diagnosis (AREA)

Abstract

Pour permettre à un sujet de maintenir facilement une posture et à un sein d'être radiographié, un appareil CT de mammographie, qui effectue une radiographie d'un sein du sujet P, comprend un portique 10, dans lequel une source de rayonnement 104 et un détecteur de rayonnement 105 sont disposés de façon à être opposés l'un à l'autre. Le portique 10 comprend une partie inclinée 13, qui est inclinée sous une forme de cône, et une partie plate 14, qui est formée le long d'une partie extrémité de la partie inclinée 13, la partie plate 14 ayant une partie ouverture 15 dans laquelle le sein du sujet P est inséré.
PCT/JP2015/006003 2014-12-09 2015-12-03 Appareil ct de mammographie WO2016092780A1 (fr)

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JP2014249442A JP6463110B2 (ja) 2014-12-09 2014-12-09 乳房撮影用ｃｔ装置
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040081273A1 (en) * 1999-11-18 2004-04-29 Ruola Ning Apparatus and method for cone beam volume computed tomography breast imaging
WO2004041089A2 (fr) * 2002-11-08 2004-05-21 Art Advanced Research Technologies Inc. Procede et dispositif de positionnement d'un patient sur une table pour une intervention medicale sur la poitrine
EP1864611A1 (fr) * 2005-04-01 2007-12-12 Keizi Shibuya Système d'examen mammaire
US20080089471A1 (en) * 2006-10-11 2008-04-17 Canon Kabushiki Kaisha Medical breast-image capturing apparatus
US20080101530A1 (en) * 2006-10-31 2008-05-01 Xcounter Ab Imaging arrangement and system for imaging
US20100074400A1 (en) * 2008-09-25 2010-03-25 Fujifilm Corporation Radiation imaging and therapy apparatus for breast

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040081273A1 (en) * 1999-11-18 2004-04-29 Ruola Ning Apparatus and method for cone beam volume computed tomography breast imaging
WO2004041089A2 (fr) * 2002-11-08 2004-05-21 Art Advanced Research Technologies Inc. Procede et dispositif de positionnement d'un patient sur une table pour une intervention medicale sur la poitrine
EP1864611A1 (fr) * 2005-04-01 2007-12-12 Keizi Shibuya Système d'examen mammaire
US20080089471A1 (en) * 2006-10-11 2008-04-17 Canon Kabushiki Kaisha Medical breast-image capturing apparatus
US20080101530A1 (en) * 2006-10-31 2008-05-01 Xcounter Ab Imaging arrangement and system for imaging
US20100074400A1 (en) * 2008-09-25 2010-03-25 Fujifilm Corporation Radiation imaging and therapy apparatus for breast

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