1. A method for generating a digital dental panoramic image, comprising: using several individual overlapping frames 300 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 300 being taken by moving the x-ray source and the image detector around a patient's head, and calculating the panoramic image 200 by summing information of the frames 300 , wherein the panoramic image 200 is generated by summing information of the frames 300 with respect to information of location and orientation of the x-ray beam and the x-ray detector at times when taking the frames.