JP2007136163A5

JP2007136163A5 -

Info

Publication number: JP2007136163A5
Application number: JP2006284593A
Authority: JP
Filing date: 2006-10-19
Publication date: 2009-01-15
Anticipated expiration: 2026-10-19

Claims

An X-ray source that emits X-rays;
A target that outputs a digital electrical signal corresponding to incident X-rays at a constant frame rate, and a pair of the X-ray source and the detector facing each other across the target. Moving drive means for moving around,
Storage means for sequentially storing, as frame data, electrical signals output by the detector at the frame rate as the movement driving means moves the X-ray source and the detector around the object;
Panorama image generating means for generating a panoramic image of a desired tomographic plane designated in advance based on the frame data stored in the storage means;
Using the frame data, a specified partial area of the panoramic image is focused according to a desired position on the space where the X-ray source and the detector are moved by the movement driving means. And a partial cross-sectional image generating means for generating a partial cross-sectional image.

The panoramic image photographing device according to claim 1,
Variable on coordinates determined by the position in the space, a plurality of frame data stored in the storage means, and the mapping position when the frame data is mapped on the memory space to reconstruct a panoramic image A pre-measurement means for presetting correspondence information between a gain defined as a slope of a simple curve and
The panoramic image generation means is means for generating the panoramic image by referring to the correspondence information according to the position of the desired tomographic plane in the space,
The partial cross-sectional image generation unit is a panoramic image photographing device that is a unit that generates the partial cross-sectional image by referring to the correspondence information according to a position of the partial region in the space.

The panoramic image photographing device according to claim 2,
The movement drive means is means for moving the pair of the X-ray source and the detector so that the desired tomographic plane is in focus,
The pre-measurement means includes
Means for setting the correspondence information of the desired tomographic plane from the frame data read from the storage means;
Means for calculating the correspondence information of each position in the space as three-dimensional information from the correspondence information of the desired tomographic plane;
A panoramic image photographing apparatus.

The panoramic image photographing device according to claim 3,
The detector is a line detector having a line-shaped detection surface on which the X-rays are incident,
The panorama image photographing apparatus in which the gain takes the same value for each position at a position parallel to the detection surface of the detector in the space.

The panoramic image photographing device according to claim 2,
The movement driving means is means for moving the pair of the X-ray source and the detector along the desired tomographic plane ,
The rotation driving means is configured to provide a distance ratio between the distance between the X-ray source and the object and the distance between the object and the detector and the X so that the desired tomographic plane is always in focus. Panorama image photographing device as means for adjusting the moving speed of a pair of a radiation source and the detector

The panoramic image photographing device according to claim 2,
The panoramic image generating means
Panoramic image display means for displaying a panoramic image of the desired tomographic plane;
The partial cross-sectional image generating means
A region of interest setting means capable of interactively setting a partial region of interest in the panoramic image displayed by the panoramic image display means as the partial region;
Receiving means for interactively receiving the gain of the cross section defined by the region of interest as information on the specified distance;
Gain acquisition means for acquiring a gain according to the cross-section conversion information with reference to the correspondence information from the desired cross-section conversion information;
A panoramic image photographing apparatus comprising: a partial cross-sectional image calculating unit that calculates an image corresponding to the cross-sectional conversion information as the partial cross-sectional image based on the gain acquired by the gain acquiring unit and the frame data.

The panoramic image photographing device according to claim 2,
The pre-measurement means includes
A pre-imaging means for photographing the panoramic image by placing a phantom device provided with a phantom for measuring a distance in a linear direction connecting the X-ray source and the detector at a position where the object is placed;
Means for setting the desired gain for each of the distances while the photographer visually observes the phantom reflected in the panoramic image photographed by the preliminary photographing means;
A panoramic image photographing device comprising: means for storing the set correspondence information of the distance and the gain in a memory.

The panoramic image photographing device according to claim 1,
A panoramic image photographing apparatus provided with contrast enhancing means for enhancing the contrast of the partial sectional image on the partial sectional image generated by the partial sectional image generating means.

An electrical signal output by the radiation detector at a constant frame rate as the X-ray source and detector pair are moved around the object in a state where the X-ray source and the detector are opposed to each other with the object sandwiched therebetween. As sequentially
Based on the stored frame data, a panoramic image of a tomographic plane designated in advance is generated,
Using the frame data, a partial cross-sectional image in which a specified partial area of the panoramic image is focused according to a desired position on a space in which the X-ray source and the detector are moved is obtained. An image processing method in panoramic photography, characterized in that:

A program stored in memory and readable by a computer,
The electrical signals output by the radiation detector at a constant frame rate are sequentially stored as the X-ray source and detector pair are moved around the object in a state of facing each other with the object interposed therebetween. In the program that processes the frame data obtained
In the computer,
Generating a panoramic image of a desired tomographic plane specified in advance using the stored frame data;
Using the frame data, the designated partial area of the panoramic image of the desired tomographic plane is focused according to a desired position on the space where the X-ray source and the detector are moved. Generating a partial cross-sectional image;
A program characterized by being executed functionally.