JP2011083499A5 - - Google Patents

Claims (4)

A radiation source that emits radiation; and
A detector that is arranged opposite to the radiation source and outputs two-dimensional data of a digital quantity of electricity corresponding to the radiation when the radiation is incident;
Any one of the radiation source and detector pair, the detector, or the object is moved relative to the remaining elements of the radiation source, the detector, and the object. Transportation means;
Data collecting means for collecting the data output from the detector in units of frames while the pair of the radiation source and the detector, the detector, or the object is moved by the moving means;
Using the data collected by the data collection means and a reference tomographic plane set in an imaging space existing between the radiation source and the detector, a three-dimensional image of the imaging region of the object is obtained. In a radiation imaging apparatus, comprising: a first image creation means for creating,
A phantom for calibrating parameters defining the imaging space including the three-dimensional position of the reference tomographic plane;
Second image creation means for creating an image for calibration based on data collected by the data collection means when radiation is emitted from the radiation source in a state where the phantom is arranged in the imaging space;
Calibration means for calibrating the parameter based on information of a known amount of the phantom and projection position information of the phantom obtained from the calibration image ;
The phantom is
A first phantom for obtaining parameters of a three-dimensional positional relationship between the radiation source and the detector;
A second phantom for obtaining parameters of a three-dimensional positional relationship with respect to the object at the time of relative movement of the radiation source and the radiation detector;
A radiation imaging apparatus , comprising: a third phantom for measuring a projection angle of radiation emitted from the radiation source toward the detector . The radiation source is an X-ray tube that emits X-rays as the radiation,
The detector is a detector for detecting the X-rays irradiated from the X-ray tube;
The first image creating means creates a three-dimensional image in which the data collected by the data collecting means is processed as the three-dimensional image based on a tomosynthesis method to optimize the focus of the imaging part of the object. Means to
The second image creation means is means for processing the data collected by the data collection means based on a tomosynthesis method to create the calibration image.
The radiation imaging apparatus according to claim 1. A radiation source that emits a radiation source and a detector that detects the radiation as an electrical signal are opposed to each other with an object interposed therebetween, and the pair of the radiation source and the detector is rotated around the object. The radiation source in a radiation imaging apparatus that detects radiation emitted from the radiation source and transmitted through the object as an electrical signal by a detector, and creates an image of the imaging region of the object based on the electrical signal A phantom device for calibrating a three-dimensional spatial positional relationship between the detector and the detector,
A first phantom for obtaining parameters of a three-dimensional positional relationship between the radiation source and the detector;
A second phantom for obtaining parameters of a three-dimensional positional relationship with respect to the object at the time of relative movement of the radiation source and the radiation detector;
A third phantom for measuring a projection angle of radiation emitted from the radiation source toward the detector;
A phantom device characterized by comprising: 4. The phantom device according to claim 3, wherein the third phantom and the second phantom have a structure created as a set of phantoms.