Patent ID: 6893157
Filing Date: 2005-05-17
Classification: A61B,G21K

Abstract:
1. A radiation image obtaining system comprising: a radiation source; a radiation image detector for recording a radiation image of a subject by irradiation thereof by radiation emitted from a radiation source, which has passed through the subject; and a grid provided between the radiation image detector and the radiation source, parallel to a recording surface of the radiation image detector; an angle/position detection member provided between the radiation source and the radiation image detector, having at least two detection portions having a transmittance rate with respect to radiation emitted from the radiation source different from their surroundings, which are provided at predetermined positions with respect to the recording surface; and an angle/position calculating means for calculating a position of the radiation source with respect to the recording surface and/or an angle of a central axis of the radiation emitted from the radiation source with respect to the recording surface; wherein at least two lines, which pass through positions of images of the detection portions, recorded in the radiation image detector by irradiation thereof by the radiation which has passed through the detection portions, and the predetermined positions of the detection portions, are obtained; and the angle/position calculating means calculates the position of the radiation source with respect to the recording surface and/or the angle of the central axis of the radiation emitted from the radiation source with respect to the recording surface based on distances between an intersection of the at least two lines and the predetermined positions of the detection portions, or distances between the position of the intersection of the at least two lines and the positions of the images of the detection portions.