48results about "Radiation diagnostics for dentistry" patented technology

The present invention provides a method for producing a dental restoration for preferably at least a part of at least one tooth. The method comprises the step of obtaining design data, wherein the design data includes acquired data and preliminary design data of the dental restoration. The method further comprises the step of modifying the preliminary design data before at least one manufacturing step to obtain modified design data and producing the dental restoration based on the modified design data.

Systems and methods for the calibration of X-ray devices and systems are described in this application. In particular, this application describes a calibration apparatus for an X-ray imaging system that comprises a housing containing an X-ray sensor and a calibration array having multiple calibration targets located within or on a substrate. Each calibration target comprises an element with an X-ray absorption higher than that of the material of the substrate. The multiple targets are in a fixed spatial relationship relative to each other. The calibration apparatus can be incorporated into an aligner that is used with the X-ray imaging system. That calibration apparatus increases the accuracy of the construction of a three dimensional (3D) image from a series of two dimensional (2D) images taken by the X-ray imaging system. Other embodiments are described.

A method for automatic registration of dental image data comprises receiving three-dimensional intraoral surface scan data of a dentition of a patient, receiving three-dimensional volumetric scan data of the dentition, generating a first set of descriptors characterizing tooth crown surfaces of the dentition from the intraoral surface scan data, generating a second set of descriptors characterizing tooth crown surfaces of the dentition from the volumetric scan data, determining a best-fit registration transform based on the first and second sets of descriptors, and aligning the intraoral surface scan data and the volumetric scan data based on the best-fit registration transform.

The present invention relates to a device and a method for reconstructing three-dimensional oral scan data by using a computed tomography (CT) image. According to an embodiment of the present invention, reconstruction is performed by generating 3D coordinate information and 3D feature points from a CT image without geometric distortion and locally matching the CT image and scan key frames obtained from a scanner, so that errors due to accumulated matching of the scan key frames can be reduced, thereby reducing geometric distortion of an oral scan model.

The present invention provides a method of matching data, which is performed by an apparatus for matching data, the method including synchronizing acquisition time points of cone beam computed tomography (CBCT) data and 3D scan data, conforming coordinate systems of the CBCT data and the 3D scan data, constructing a 3D scan image in which a motion is corrected by matching depth maps created each time the 3D scan data are acquired, and constructing a CBCT 3D image in which the motion is corrected from the CBCT data by applying motion information acquired by matching the depth maps.

Embodiments may provide a method for measuring a site of bone graft and an amount of bone graft around a virtual fixture. To this end, according to embodiments, a type of bone defect may be determined based on bone density information of an alveolar bone around a virtual fixture, and the site of bone graft and the amount of bone graft may be determined according to the determined type of bone defect. According to embodiments, there is an advantageous effect that accurate information can be provided to a user to enable precise grafting during implant surgery.

The present invention provides a method for creating a 2D panoramic image of an intraoral cavity (6), comprising the steps of: A) providing a plurality of projection images acquired while a recording unit comprising a radiation source (2) and an electronic image sensor (3) rotates at least partially around the intraoral cavity (6) in a given position; B) calculating an image comprising at least one anatomical feature from the plurality of projection images using a calculation rule having reconstruction parameters; C) providing a model of at least one anatomical feature describing the at least one anatomical feature at a target position in the image; D) identifying the at least one anatomical feature in the calculated image; E) applying a metric to the calculated image. step F) determining a deviation between an actual position of the at least one identified anatomical feature in the computed image and a target position of the at least one anatomical feature in the model; step F) modifying at least one of the reconstruction parameters and recalculating at least one portion of the image showing the at least one anatomical feature using the computation rule and the at least partially modified reconstruction parameters or modifying a pixel transformation and applying the pixel transformation to at least one portion of the computed image showing the at least one anatomical feature so that at least this portion of the image is recalculated; step G) deriving a 2D panoramic image from the recalculated image; and step H) outputting the 2D panoramic image.

The present invention provides an intraoral x-ray system, the intraoral x-ray system comprising: an x-ray source located within the environment; a robotic arm including an actuatable scissor arm having a first end configured to be attached to a mounting and a second end attached to an x-ray source, at least one of the first end and the second end including a rotatable actuatable joint; a position sensor for determining variations in position and / or orientation of the environment relative to the X-ray source and variations in position and / or orientation of the mobile X-ray sensor relative to the X-ray source; and a drive unit for actuating the robot arm as a function of the determined variation in position and / or orientation to control the position and / or orientation of the X-ray source relative to a predetermined position and / or orientation of the X-ray source.

Limited precision of head standardization is a problem in the prior art.　In the present invention, positioning of a patient head is standardized using two cameras, namely, a first digital camera 11 and a second digital camera 12. In a profile positioning step, while a display on a first monitor 13 is viewed, the vertical position of the first digital camera 11 is adjusted, and instructions are given to the patient to adjust the forward-backward position of the head so that the point of intersection of a first vertical reference line VL1 and a first horizontal reference line HL1 corresponding to the camera optical axis of the first digital camera 11 is in the center of the ear canal of the patient. In a front positioning step, while a display on a second monitor 16 is viewed, the vertical position of the second digital camera 12 is adjusted so that a second horizontal reference line HL2 passes through the center of the left and right eyeballs of the patient, and instructions are given to the patient to adjust the left-right inclination of the head and face such that the heights of the left and right eyes are equal, and to adjust the left-right orientation of the head and face so that a second vertical reference line VL2 passes through the center of the left and right eyes of the patient.

To provide a technology capable of reducing the number of types of size of a waterproof bag, and making body fluid such as saliva hard to enter the inside of the waterproof bag.SOLUTION: An imaging plate protection assembly can accommodate a plurality of imaging plates. The imaging plate protection assembly includes a plurality of waterproof bags and a holding member. The plurality of waterproof bags accommodate the plurality of imaging plates, respectively. The holding member holds the plurality of imaging plates accommodated in the plurality of water proof bags at predetermined positions.SELECTED DRAWING: Figure 1

To detect a defect in an imaging plate by a method other than visual inspection.SOLUTION: An image generation device includes: an acquisition part for acquiring a plurality of X-ray images on the basis of X-ray information from each imaging plate irradiated with an X-ray after an X-ray is radiated to an imaging plate unit configured so that at least two imaging plates used in an intraoral method are stacked with each other; a detection part for detecting a defect on an image on the basis of the plurality of X-ray images; and an output part for outputting a result of the detection by the detection part.SELECTED DRAWING: Figure 2

The present invention relates to a computer-implemented X-ray imaging method for generating a panoramic image (1) with reduced overlap (8) of adjacent teeth, the method comprising the steps of acquiring a plurality of 2D X-ray images (2) in a plurality of different X-ray imaging directions (3) by rotating an X-ray source (4) and an X-ray detector (5) around a patient's jaw (6), respectively, and further comprising the steps of identifying, from among the corresponding X-ray imaging directions (3), one or more regions (7) each including at least one pair of overlapping adjacent teeth (8) in the 2D X-ray images (2) and / or in a temporary panoramic image reconstructed from the 2D X-ray images (2), from which an optimal X-ray imaging direction (3') for reducing the overlap in the reconstructed panoramic image (1) can be determined, and determining, from among the corresponding X-ray imaging directions (3) of the 2D X-ray images identified in the step of identifying one or more regions (7) each including at least one pair of overlapping adjacent teeth (8), one or more optimal X-ray imaging directions (3') for reducing the overlap in the reconstructed panoramic image (1), respectively.

To prevent an X-ray detecting unit including an X-ray detector from contacting the shoulders of a subject while improving the resolution of a panoramic image.SOLUTION: A panoramic X-ray imaging apparatus 20 includes: an X-ray generating unit; an X-ray detecting unit 44; a support 40 (for example, a turning arm) that supports the X-ray generating unit and the X-ray detecting unit 44; a drive mechanism 60 that turns at least the X-ray generating unit and the X-ray detecting unit 44 by driving the support 40; a displacement mechanism 82 ( for example, a vertical drive unit) that adds movement including a displacement component in a direction different from the turning to the X-ray detecting unit 44; a subject holding unit 32 that holds an imaging subject M; and a turning control unit (for example, an imaging control unit 100) that controls the turning by the drive mechanism and the displacement mechanism. The turning control unit controls the drive mechanism 60 and the displacement mechanism 82 so as to add the movement to the X-ray detecting unit 44, the movement avoiding the contact with the shoulders of the imaging subject during the turning of the X-ray generating unit and the X-ray detecting unit by the drive mechanism 60 during the panoramic X-ray imaging.SELECTED DRAWING: Figure 13

The present invention provides a method of matching data, which is performed by an apparatus for matching data, the method including synchronizing acquisition time points of cone beam computed tomography (CBCT) data and 3D scan data, conforming coordinate systems of the CBCT data and the 3D scan data, constructing a 3D scan image in which a motion is corrected by matching depth maps created each time the 3D scan data are acquired, and constructing a CBCT 3D image in which the motion is corrected from the CBCT data by applying motion information acquired by matching the depth maps.

To provide an image processing device, an X-ray CT imaging system, and an image processing method capable of accurately removing a metal artifact.SOLUTION: An image processing device 8 includes a communication interface 86, an arithmetic part 84, and a display part 81. The arithmetic part 84 reconfigures X-ray projection data, and calculates, as a gradient vector, a vector in a direction of a change when there is a change in continuity of a structure between each voxel of three-dimensional shape data extracted from three-dimensional CT image data and an adjacent voxel in the case where the three-dimensional CT image data includes a metal artifact A, and executes subtraction processing for the voxel having a gradient vector in which an angular difference for an axially parallel direction is within a predetermined range with a direction parallel to an axial direction of a pivot as the axially parallel direction.SELECTED DRAWING: Figure 1

Disclosed is a device for matching three-dimensional intra-oral scan data, the device comprising a computed tomography (CT) image depth map generation unit, a depth map coordinate difference information determination unit, a depth map correction unit, and an intra-oral scan model recovery unit. The CT image depth map generation unit generates a depth map of a CT frame from a CT image by using information about a single scan frame of the scan data. The depth map coordinate difference information determination unit determines depth map coordinate difference information between the depth map of the CT frame and a depth map of the scan frame. The depth map correction unit corrects the depth map of the scan frame on the basis of the depth map coordinate difference information. The intra-oral scan model recovery unit recovers a three-dimensional intra-oral scan model on the basis of the corrected depth map of the scan frame.

The present invention relates to a method for X-ray projection geometry calibration in X-ray cone beam computed tomography, comprising at least one step (S1) of acquiring a two-dimensional X-ray image (1) or sinogram (2) of at least a part of an object (3) generated by relatively rotating a detector and an X-ray source projecting X-rays towards the detector around the object (3), characterized in that the method further comprises at least one step (S4) of detecting at least one feature (3 a) of the object (3) in the two-dimensional X-ray image (1) or sinogram (2) by using a trained artificial intelligence algorithm, and at least one step (S5) of generating calibration information defining the geometry of the X-ray projection based on the detection.

To provide an oral cavity imaging device capable of suppressing increase in a temperature of an imaging part disposed in the oval cavity even when imaging is executed at a high frame rate, for example.SOLUTION: An oral cavity imaging device 1 includes an imaging part 2 for detecting a radioactive ray passing through an object in a state of being disposed in the oral cavity, and a control part 3 for controlling the imaging part 2 in a state of being disposed outside the oral cavity. The imaging part 2 includes an image sensor 22 having a plurality of pixels DA for acquiring an image of the object. In a state that power is supplied to the control part 3, the control part 3 executes supply of power to the image sensor 22 in an imaging period that the image sensor 22 executes imaging, and stops supply of power to the image sensor 22 in a stand-by period that the image sensor 22 stands by.SELECTED DRAWING: Figure 3

A dental imaging systems provides multiple dental imaging functions, including digital x-ray, 3D dental scanning, and intraoral imaging. The system includes imaging trays that can be inserted into the mouth and positioned around the teeth. Each imaging tray has exterior and interior sidewalls connected by a floor. One or more imaging sensors are mounted on the sidewalls and can sense x-ray radiation, visible light, ultraviolet light, and infrared light. The imaging trays are designed to interface with an umbilical, which contains cables for transmitting power, data, and light. A workstation communicates with the imaging trays via the umbilical. The dental imaging system is capable of performing digital x-ray imaging, 3D dental scanning, and intraoral imaging, providing improved speed and patient comfort.

A method is provided for obtaining operating parameters of an x-ray CBCT imaging device in light of the acquisition of a data set of a patient's maxillofacial region. [Solution] The method includes identifying a first maxillofacial region of interest (ROI1) on a patient, determining the height of the horizontal plane of ROI1 when the patient is in an occlusal position or biting a patient positioning assembly, acquiring a first set of data relative to ROI1 using x-ray CBCT imaging, reconstructing axial CBCT slices based on the first set, displaying the reconstructed axial CBCT slices of ROI1 from the acquired first set of data, defining a second region of interest (ROI2) based on the intersection of the displayed reconstructed axial CBCT slices of ROI1 with ROI1, and obtaining operating parameters based on ROI2 in consideration of acquiring a second set of data including ROI2.

Disclosed is a device, for matching oral scan data, comprising a first matching unit, a teeth segmentation unit, and a second matching unit. The first matching unit matches a coordinate system of three-dimensional oral scan data to a coordinate system of a three-dimensional oral computed tomography (CT) image by using three-dimensional feature points of the three-dimensional oral scan data and three-dimensional feature points of the three-dimensional oral CT image. The teeth segmentation unit segments teeth from the three-dimensional oral scan data on the basis of the three-dimensional feature points of the three-dimensional oral scan data to generate surface information relating to the segmented teeth. The second matching unit matches the three-dimensional oral scan data and the three-dimensional oral CT image, which have matching coordinate systems, by means of the surface information.

Disclosed herein are novel methods, devices, and systems for facilitating and / or accelerating movement and / or alignment of teeth by using radiofrequencies such as X-rays. Specifically disclosed is a morphogenetic bone accelerator (MBA) comprising two segments, an upper segment that is configured to cover the upper arch (or maxilla) of a patient's mouth, and a lower segment that is configured to cover the lower arch (or mandible) of the patient's mouth. Both the upper and the lower segments of the MBA comprise a metal wire surrounded by a soft body. The wire conducts or translates benign radiation emitted from a radiation emitting device into a patient's mouth. Such radiation may be low-energy surface X-rays (e.g., having a radiation power range of between 10 and 100 kilovolts (kV)) and / or medium and deep X-rays (e.g., having a radiation power range of between 120 and 200 kV).

A method of displaying multiple bone density performed in a multiple bone density display device when planning an implant procedure includes overlaying a bone density display area including an implant body placement area with a tooth area, displaying a bone density value corresponding to the bone density display area in a first color, and determining whether to display a second color on an edge of the implant body or an edge of the bone density display area displayed in the first color, based on a bone density difference value between an area having a greatest bone density value and an area having a smallest bone density value in the bone density display area. Embodiments have the effect of effective procedure planning by providing bone density information on an implant part when planning an implant procedure.

The present teachings relate to a method for improving usability of dental imaging data, comprising: providing imaging data comprising a plurality of different images of at least one dental imaging modality of a patient; providing metadata for each of the images; selecting one or some of the images; retrieving in response to the selection at least one another image; wherein the retrieval is performed by comparing metadata of at least one of the selected images and metadata of at least one of the retrieved images. The present teachings also relate to systems, software products and storage media.

To provide a technique capable of diagnosing a disease state in a biological tissue in the oral cavity in a low invasive manner in a short time.SOLUTION: A support device 1 includes: an input interface 14 to which image data representing the three-dimensional shape of a biological tissue is input; and a calculation device 11 which derives support information by using the image data input from the input interface 14 and an estimation model 50 that has been trained by machine learning so as to derive support information including at least information about the relative positions of the tooth and the gingiva for supporting diagnosis of a disease state in the biological tissue based on the image data.SELECTED DRAWING: Figure 2

In some embodiments, a method for measuring a periodontal condition can include generating or obtaining radiograph data for a tooth and a respective bone structure, generating or obtaining surface data for the tooth, the surface data including surface information of a gum tissue associated with the tooth, and combining the radiograph data and the surface data such that a feature of the tooth in the radiograph data substantially matches with a corresponding feature of the tooth in the surface data. The method can further include calculating a periodontal parameter from the combination of the radiograph data and the surface data, with the periodontal parameter being indicative of the periodontal condition.

To provide a versatile, cost-optimized X-ray imaging system for a Cephalometric dentomaxillofacial X-ray imaging operation, which makes it possible to carry out one-shot (full-view) and scanning imaging operations.SOLUTION: An X-ray imaging system (100) comprises a controller (132), an X-ray emitter (104) for emitting X-rays (106), primary and secondary collimators (108, 110) for collimating the X-rays, an X-ray receiver (124) for receiving the X-rays from the emitter, and a positioner (120) for positioning an object (102) to be imaged. The controller is configured to select one of one-shot and scanning Cephalometric imaging operations and to control the emitter (106) to emit X-ray radiation and the receiver to receive the emitted radiation in order to acquire X-ray image data in the selected imaging operation.SELECTED DRAWING: Figure 1b

A device is disclosed for diagnosing a dental condition. The device captures image data representative of a tooth of a patient based on data obtained from a hardware device that scans the tooth. The device inputs the image data into a first supervised machine learning model, and receives, as output from the first supervised machine learning model, a plurality of biomarkers, each biomarker corresponding to a different location of the tooth. The device inputs the plurality of biomarkers into a second supervised machine learning model, and receives, as output from the second supervised machine learning model, a diagnosis of a dental condition.

The present invention relates to a method for obtaining operating parameters of an x-ray CBCT imaging device taking into account the acquisition of a set of data of a maxillofacial region of a patient, the method comprising: identifying a first maxillofacial region of interest (ROI1) of the patient; determining the height of a horizontal plane of the patient's first maxillofacial region of interest (ROI1) when the patient is in an occlusal position or biting a patient positioning assembly; acquiring a first set of data relative to the patient's first maxillofacial region of interest (ROI1) including the horizontal plane using x-ray CBCT imaging through a slit-shaped collimator window; and reconstructing axial CBCT slices including the horizontal plane based on the first set of data relative to the patient's first maxillofacial region of interest (ROI1). - displaying reconstructed axial CBCT slices of the patient's maxillofacial first region of interest (ROI1) from the acquired first set of data; - defining at least in part a second region of interest (ROI2) based on an intersection of the displayed reconstructed axial CBCT slices of the patient's maxillofacial first region of interest (ROI1) with ROI1; and - obtaining operating parameters of the x-ray CBCT imaging device based at least on the defined second region of interest (ROI2) in consideration of the acquisition of a second set of data including the defined second region of interest (ROI2). [Selected figure] Figure 3