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X-ray CT apparatus

By determining complementary projection points and calculating weights in the X-ray CT equipment, interpolation and wedging techniques are used to restore the clipped data, which solves the data clipping problem when scanning larger objects and improves image quality and integrity.

Inactive Publication Date: 2006-06-07
TOSHIBA MEDICAL SYST CORP
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Problems solved by technology

However, generalizing the idea to helical cone-beam data is not trivial in any case

Method used

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[0047] Figure 5 Shows the concept of complementary rays. The fan beam ray (β, γ) has an opposing complementary ray (β+π+2γ, −γ), so that the cone beam transformation function g(β, γ)=g(β+π+2γ, −γ). The opposite complementary ray has x-ray radiation opposite to the truncated ray, which has the same path as the truncated ray. Assuming fan beam data is available and needs to fully cover the entire FOV of the object, g(β,γ), β>0, -γ max ≤γ max , beyond the detector angle range. For example, there can be corresponding to γT≤γ≤γ max , the truncated region of γT>0, and the data pair -γ max ≤γ≤γT is known. For example, see Figure 4 . For γT≤γ0≤γ max The intercepting ray (β0, γ0), the complementary ray (β 0 C , gamma 0 C )=(β 0 +π+2γ 0 ,-γ 0 ) is known because γ max ≤γ 0 C ≤-γT.

[0048] The projection angle β±π+γ is complementary to the ray (β,γ). For ring geometries, which do not matter from a pure geometry point of view, their complementary projections are use...

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Abstract

A method, system and computer program product for compensating for unavailability of projection data of a scanned object at selected points that are outside the detection range of a detector. The method includes the step of obtaining projection data of the scanned object, and based on the obtained projection data and the coordinates of the selected point relative to the detector, compensating for the unavailability of the projection data at the selected point. The step of compensating includes determining at least one complementary projection angle and the coordinates of at least one complementary point based on the source projection angle and the coordinates of the selected point relative to the detector, and based on the acquired projection data, the at least one complementary projection angle, and the at least one complementary point coordinates to estimate the projected data values ​​at the selected point.

Description

technical field [0001] The present invention is directed to the restoration of asymmetrically truncated imaging data. More specifically, the present invention relates to X-ray CT equipment for recovering truncated helical cone-beam computed tomography (CT) data when truncation occurs due to displacing the detector so that it sees Field of View (FOV) completely covers the result of oversized objects. Background technique [0002] The present invention encompasses the use of various techniques that are referred to or described in the references listed below, which are cited throughout the specification by their corresponding identification numbers in parentheses. [0003] Reference list [0004] [1] P.E.Danielsson, P.Edholm, J.Eriksson and M.Seger, "For Long Object Helical Accurate 3D reconstruction from cone-beam scanning - a novel detector arrangement and new complete conditions". [0005] [2] V.Liu, R.Lariviere, and G.Wang published "X-ray micro-CT with a moving detecto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03G01N23/04G01T1/00
CPCG06T11/005G06T2211/432A61B6/027Y10S378/901
Owner TOSHIBA MEDICAL SYST CORP
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