US 2015/0305702 A1 · RADIATION TOMOGRAPHIC IMAGE GENERATING APPARATUS, AND RADIATION TOMOGRAPHIC IMAGE GENERATING METHOD

Abstract

This invention identifies a metal area of actual measurement projection data from the actual measurement projection data and an actual measurement reconstruction image obtained by image reconstruction of the actual measurement projection data, to acquire metal area identification data. In the actual measurement projection data, a resulting image has pixel values in the metal area such as of wire or screws, for example, not so different from pixel values of other areas, which makes it difficult to identify the metal area accurately. However, the metal area can be identified with increased accuracy. Based on the metal area identification data, data replacement of the metal area of the actual measurement projection data p1 is carried out with data obtained from pixels adjacent the metal area, thereby to acquire replacement projection data, which is put to image reconstruction to generate a replacement reconstruction image without the metal area. Since the metal area is identified with increased accuracy, the tissue adjacent the metal area of the tomographic image (replacement reconstruction image) can be restored with increased accuracy.

Claims10

Dependent claims

(canceled)

A radiation tomographic image generating apparatus comprising:

an actual measurement image reconstruction unit for carrying out image reconstruction of a plurality of actual measurement projection data acquired from different directions with respect to an inspection object including a high radiation absorber, to generate an actual measurement reconstruction image;
a high absorber area identifying unit for identifying a high absorber area of the actual measurement projection data from the actual measurement projection data and the actual measurement reconstruction image, to acquire high absorber area identification data;
a data replacing unit for carrying out, using the high absorber area identification data, data replacement of the high absorber area of the actual measurement projection data with data obtained from pixels adjacent the high absorber area, to acquire replacement projection data;
a replacement image reconstruction unit for carrying out image reconstruction of the replacement projection data to generate a replacement reconstruction image;
a difference processing unit for determining a difference between the actual measurement projection data and the replacement projection data to acquire difference projection data;
a difference image reconstruction unit for carrying out image reconstruction of the difference projection data to generate a difference reconstruction image;
and
a composite image generating unit for generating a composite reconstruction image by selecting at least one image from among the actual measurement reconstruction image, the replacement reconstruction image and the difference reconstruction image on an area-by-area basis.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/424,909Filed 31 Aug 2012

Published

29 Oct 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61B 6/5258
Devices using data or image processing specially adapted for radiation diagnosis: involving detection or reduction of artifacts or noise
A61B 6/025
Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis: tomosynthesis
A61B 6/03
Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis: computed tomography [CT]
A61B 6/12
Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment: arrangements…

Radiation tomographic image generating apparatus, and radiation tomographic image generating method

Life of this patent

Radiation tomographic image generating apparatus, and radiation tomographic image generating method

Life of this patent

Abstract

Claims10