Patent RU-2677830-C1 (RU)
Inventor: TOIMELA LASSE
IPC: G06T11/00
Filed: 2014-12-18
Granted: 2019-01-21
Abstract: FIELD: medicine.SUBSTANCE: group of inventions relates to medical equipment, specifically to means of generating digital panoramic dental images. Method for generating a digital dental panoramic image, comprises using several individual overlapping frames taken along a dental arch by a dental panoramic x-ray imaging apparatus, said apparatus including an x-ray source for generating an x-ray beam and having a focus, and an image detector having pixel columns, and said frames being taken by moving the x-ray source and the image detector around a patient's head, and calculating the panoramic image by summing information of the frames, wherein the panoramic image is generated by summing information of the frames with respect to information of location and orientation of the x-ray beam and the x-ray detector at times when taking the frames, forming a virtual panoramic curve taking into account the information of the location and the orientation of the x-ray beam and the image detector, which shows the desired tomographic layer, which will be shown through the panoramic image, determining the location of the desired point or points (P) taking into account information of the location and orientation of the x-ray beam and the image detector at times when taking the frames, and determining the location of the desired point or points (P) on the curve for the column (C) of the generated panoramic image, forming a column (C) of the panoramic image by summing up those columns of individual frames for which the point (P) is projected as observed from the focus of the radiation source, and said projection (P-> P') determines the direction of the projection point (P) in relation to a particular individual frame, determining the desired direction of observation (D) for at least one desired point (P) and calculating for a column in a separate frame a weighting factor which is based on the angle between the direction of observation (D) and the direction determined by a line extending from the focus of the radiation source to said point (P), and using a weighting factor in summing information from frames to give less weight to a column of a frame with a large angle between the direction of the vector, showing the desired direction of observation (D), and said direction determined by a line extending from the focus of the radiation source to the point (P). Method of generating and presenting digital dental panoramic images includes using several separate overlapping frames taken along the dental arch by means of an x-ray device for generating a dental panoramic image, said apparatus including an x-ray source for generating an x-ray beam and having a focus, and an image detector having pixel columns, and a display, and the frames are taken by moving the x-ray source and the image detector around the patient’s head, calculating the panoramic image by summing information from the frames, and presenting the panoramic image of the tomographic layer thus formed on the display, wherein at least two panoramic images observed from different directions are generated, and for each such direction of observation several images showing different tomographic layers are generated, for each such observation direction, one of said several images, showing the different tomographic layers, is chosen to represent said direction of observation, and said at least two panoramic images showing views from different directions are presented on the display simultaneously, sequentially, as a combination image or as a moving image. Methods are carried out by means of corresponding devices comprising an x-ray source having a focus, and an image detector having a plurality of pixel columns, wherein the x-ray source and the image detector are placed in the device at a distance from each other, drive means for moving the x-ray source and the image detector around the patient's head, a control system (CS), and a user interface (UI).EFFECT: inventions widens the capacity of generating dental panoramic images from frame data obtained with a single scan.18 cl, 7 dwg