Abstract:
A method for determining if an object of a scan generated by a movable scanner has moved by comparing images generated at a plurality of orientations of the movable scanner and information related to such images. The object is scanned at a first orientation of the movable scanner, and scanned a second time at the first orientation of the movable scanner. A first brightness quantity is generated based on scanning the object at the first orientation, and a second brightness quantity is generated based on scanning the object the second time at the first orientation. The method also includes determining a motion factor based on the first brightness quantity, the second brightness quantity, and first and second images generated at the first orientations of the movable scanner.
Abstract:
A method of and apparatus for displaying tomographic information are disclosed. A compact region within an imaged target is defined. An image is generated showing part of the target encircling the compact region.
Abstract:
In one embodiment of a method of and apparatus for correcting for scatter, an object, which may be the jaw of a dental patient, is subjected to x-rays or other penetrating radiation. An intensity distribution of the transmitted radiation is detected. A first array of voxel data representing the absorption of the radiation by the object is reconstructed from the detected intensity. A radiation scatter pattern is calculated by forward projection from the first array using one or more point spread functions. The detected intensity is corrected using the calculated radiation scatter pattern. A second array of voxel data representing the absorption of the radiation by the object is reconstructed from the corrected detected intensity.
Abstract:
A method and apparatus for locating an elongated object in a three dimensional data array are disclosed. A slice of data generally lengthways of the elongated object is selected. Points on the object in the selected slice are identified. Data including the points are transposed parallel to the slice and transversely to the elongated object to align the points in a direction parallel to the slice and transverse to the elongated object. A current slice is selected that is rotated around the length direction of the object relative to the previously selected slice. The identifying and transposing are repeated to align points on the object in a direction parallel to the current slice and transverse to the elongated object.
Abstract:
In one embodiment of a method of and apparatus for correcting for scatter, an object, which may be the jaw of a dental patient, is subjected to x-rays or other penetrating radiation. An intensity distribution of the transmitted radiation is detected. A first array of voxel data representing the absorption of the radiation by the object is reconstructed from the detected intensity. A radiation scatter pattern is calculated by forward projection from the first array using one or more point spread functions. The detected intensity is corrected using the calculated radiation scatter pattern. A second array of voxel data representing the absorption of the radiation by the object is reconstructed from the corrected detected intensity.
Abstract:
A system for removing artifacts caused by x-ray reflective materials from an x-ray image of a patient's teeth. The system includes an x-ray source, an x-ray detector that captures several x-ray images, and a surface scanner that captures a surface scan of the patient's teeth. An image processor generates three-dimensional models from the optical surface data and the CT volumetric data. The models are resized and oriented to be of the same scale and orientation and then overlaid to create a combined data set. Data points that extend beyond the surface of the patient's teeth in the surface model are identified and may be removed if it is determined that they are artifacts. An artifact-reduced CT model is then displayed.
Abstract:
A method and apparatus for locating an elongated object in a three dimensional data array are disclosed. A slice of data generally lengthways of the elongated object is selected. Points on the object in the selected slice are identified. Data including the points are transposed parallel to the slice and transversely to the elongated object to align the points in a direction parallel to the slice and transverse to the elongated object. A current slice is selected that is rotated around the length direction of the object relative to the previously selected slice. The identifying and transposing are repeated to align points on the object in a direction parallel to the current slice and transverse to the elongated object.
Abstract:
A method and a system for generating a panoramic x-ray image by obtaining volumetric x-ray image data having a first plurality of slices, segmenting the x-ray image data into a first portion above a vertical threshold and a second portion below the vertical threshold, and separating the second portion into a second plurality of slices. Further, the method and the system include generating a plurality of curves for each slice in the second plurality of slices, generating a master arch for the second plurality of slices, and generating a panoramic image based on the master arch.
Abstract:
In a method and apparatus for generating a view of a jaw, a tomographic dataset of a volume including at least part of the jaw is obtained. Inner and outer surfaces of the jaw are identified in the tomographic dataset. Data for a region with boundaries related to the identified inner and outer surfaces are selected. A panoramic view is generated from the selected data and is displayed.
Abstract:
A method of and apparatus for displaying tomographic information are disclosed. A compact region within an imaged target is defined. An image is generated showing part of the target encircling the compact region.