System and method for tomographic reconstruction utilizing circular trajectory and scanogram to reduce artifacts

a tomographic reconstruction and scanogram technology, applied in tomography, instruments, applications, etc., can solve the problems of difficult to handle changes in the imaged subject, insufficient projection data acquired from a circular scan of a cone beam, and high frequency artifacts

Inactive Publication Date: 2009-08-27
KK TOSHIBA +1
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  • Abstract
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Problems solved by technology

It is well known that the projection data acquired from a cone-beam circular scan are not sufficient for volumetric reconstruction.
The high frequency artifacts due to the longitudinal abrupt change in the imaged subject are difficult to handle.
The additional scan may increase the complexity of the scan protocol and increase the scan time and radiation dose.

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  • System and method for tomographic reconstruction utilizing circular trajectory and scanogram to reduce artifacts
  • System and method for tomographic reconstruction utilizing circular trajectory and scanogram to reduce artifacts
  • System and method for tomographic reconstruction utilizing circular trajectory and scanogram to reduce artifacts

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[0025]FIG. 1 shows an x-ray computed topographic imaging device according to the present invention. The projection data measurement system constituted by gantry 1 accommodates an x-ray source 3 that generates a cone-beam of x-ray flux approximately cone-shaped, and a two-dimensional array type x-ray detector 5 consisting of a plurality of detector elements arranged in two-dimensional fashion, i.e., a plurality of elements arranged in one dimension stacked in a plurality of rows. X-ray source 3 and two-dimensional array type x-ray detector 5 are installed on a rotating ring 2 in facing opposite sides of a subject, who is laid on a sliding sheet of a bed 6. Two-dimensional array type x-ray detector 5 is mounted on rotating ring 2. Each detector element will correspond with one channel. X-rays from x-ray source 3 are directed on to subject through an x-ray filter 4. X-rays that have passed through the subject are detected as an electrical signal by two-dimensional array type x-ray dete...

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Abstract

A computed tomography apparatus and method using line data estimated from circle data and scanogram data. An image of a subject is reconstructed using the circle data and the estimated line data. The circle data and scanogram data may be weighted in estimating the line data. The apparatus and method are useful in diminishing or eliminating streak artifacts in reconstructed images such as images including the spine.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to computed tomographic (CT) imaging, and in particular to CT imaging using scanograms to estimate line data from circular scans.[0003]2. Discussion of the Background[0004]In three-dimensional (3D) cone-beam computed tomography, the circular scan is widely used because of its convenience. It is well known that the projection data acquired from a cone-beam circular scan are not sufficient for volumetric reconstruction. The so-called cone-beam artifacts are found in the reconstructed images from circle-only cone-beam scan data. The low frequency shadow artifacts can be reduced by interpolation in the radon space. The high frequency artifacts due to the longitudinal abrupt change in the imaged subject are difficult to handle. A typical high frequency cone-beam artifact is the streaks off spines.[0005]To eliminate the cone beam artifacts in circular cone-beam scans, an additional line scan, arc...

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H05G1/60
CPCA61B6/027A61B6/032
Inventor NAKANISHI, SATORUZOU, YUZAMYATIN, ALEKSANDRSILVER, MICHAEL D.
Owner KK TOSHIBA
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