JPWO2020185823A5

JPWO2020185823A5 -

Info

Publication number: JPWO2020185823A5
Application number: JP2021555215A
Authority: JP
Publication date: 2023-11-21

Claims

An intraoral imaging device (300) for tomosynthesis imaging, comprising:
(a) an intraoral detector (20 ) coupled to a frame (78 ; 278), said frame (78; 278) defining a target aperture (168) for an incident radiation beam;
(b) an enclosure (310) configured to seat against, but not attached to or connected to, the target aperture (168) ;
(i) at least one X-ray source (10; 210) configured to emit a radiation beam from each of a plurality of focal points (f) within said enclosure (310) ;
(ii) a collimator (320) having a stationary, movable, or rolling shutter aperture (122, 124; 324, 325) for forming a collimated beam from said emitted radiation beam and for forming a collimated beam from said emitted radiation beam; a collimator (320) arranged to pass a radiation beam through the target aperture (168) and direct it as the incident radiation beam to the detector (20) ;
(iii) the shutter aperture (122, 124) of the collimator (320) in the enclosure (310) having a plurality of radiopaque markers (320) and in the path of the collimated beam ; a geometric calibration phantom (160) disposed near or within the phantom ( 324, 325) ;
Intraoral imaging device.

a linear or radial array or line of X-ray sources, wherein said at least one X-ray source (10; 210) is individually energized to supply said radiation beam in turn from each of said plurality of focal points (f); The apparatus (300) of claim 1, which is a patch panel or a concave spherical patch panel.

Claim 1, further comprising a source transport assembly (330) configured to move the position of the at least one X-ray source (10; 210) along a transport path within the enclosure (310). The device (300) described.

The apparatus (300) of claim 1, wherein the enclosure (310) is configured to be mechanically or magnetically positioned on the frame (78; 278).

The stationary collimator aperture (122, 124; 325) is configured to accommodate a radiation beam large enough to illuminate the detector surface, but to avoid radiation to tissue surrounding the detector area. The apparatus (300) of claim 1, wherein the apparatus (300) is configured to:

The collimator (320) moves the collimator (320) synchronously with the emission from each of the plurality of focal points (f) to move the collimator aperture (122, 124; 324, 325) into the target aperture (168). 4. Apparatus (300) according to claim 1 or 3, wherein the collimator movement device is preferably mechanically coupled to a source transport assembly (330).

The rolling shutter aperture (122, 124; 325) is operated by electromechanical means to open and/or roll the opening of the rolling shutter aperture (122, 124; 325) to 2. The device (300) of claim 1, wherein the device (300) allows release from each of the following.

Claim 6, further comprising a control logic processor (340) configured to execute programmed instructions for driving the collimator movement device in synchronization with emission from each of the plurality of focal points (f). (300).

The apparatus (300) of claim 1, wherein the markers of the plurality of markers are formed from a radiopaque material having an atomic number not greater than 80.

9 . The marker of the plurality of markers ( 320 ) is obtained from the group consisting of chrome steel, ceramic, tungsten carbide, and gold, or the marker of the plurality of markers ( 320 ) is formed from ceramic. (300).

The apparatus (300) of claim 1, wherein the markers of the plurality of markers (320) are arranged in first and second parallel layers.

A method for intraoral tomosynthesis imaging, the method comprising:
(a) acquiring a single shot radiographic or projection image using at least one x-ray source and an intraoral detector mounted on the frame;
(b) seating an enclosure containing the at least one x-ray source, a collimator, and a geometric calibration phantom relative to the target aperture such that it is not attached to the target aperture;
(c) emitting a radiation beam from each of a plurality of focal points within the enclosure;
(d) using a stationary aperture, a moving aperture, or a rolling shutter aperture of the collimator to form a collimated beam from the emitted radiation beam and direct the collimated radiation beam to the target aperture; and directing the radiation beam to the detector as an incident radiation beam;
(e) determining the focus of an x-ray beam onto the intraoral detector using the geometric calibration phantom having a plurality of radiopaque markers, the geometric calibration phantom comprising: determining a focus of the x-ray beam on the intraoral detector located within the path of the collimated beam and near or within the shutter aperture of the collimator within the enclosure;
including,
Methods for intraoral tomosynthesis imaging.

13. The method of claim 12, further comprising triggering emission of the radiation beam when the collimator is in position.

The collimator is a first collimator (320; 325), and the method includes a first collimator (320; 325) in which the detector (20) faces the at least one X-ray source. 13. The method of claim 12, further comprising using a set of radiopaque markers on the surface, the set of markers being positioned within the field of view of the radiation as it appears in an x-ray image.

13. The method of claim 12, further comprising allowing maximum range from the source to detector by second processing and subsequent mechanical maneuvering.