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A NOVEL GEOMETRY OF COMPUTED TOMOGRAPHY

IP.com Disclosure Number: IPCOM000235670D
Publication Date: 2014-Mar-19
Document File: 5 page(s) / 42K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes detector module geometry of an X-ray computed tomography (CT) system that eliminates gaps between modules. The detector modules are on multiple plans instead of one circular arc of conventional CT geometry, where outer modules are closer to the object, the inner ones are further.

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A NOVEL GEOMETRY OF COMPUTED TOMOGRAPHY

BRIEF ABSTRACT

The invention proposes detector module geometry of an X-ray computed tomography (CT) system that eliminates gaps between modules. The detector modules are on multiple plans instead of one circular arc of conventional CT geometry, where outer modules are closer to the object, the inner ones are further.

KEYWORDS

X-ray tube, geometry, modules, FOV

DETAILED DESCRIPTION

Certain objects or patient body which requires scanning are too large for a conventional computed tomography (CT) system. In a conventional CT system, detector modules are placed on the same distance to the isocenter and view angles are the same. Further, there exist gaps between the modules. Module gaps introduce artifacts and reduce image quality. Certain valuable X-ray flux escapes through module gaps. As a result, there is reduction in some dose at the edge of human body.

Therefore, there is a need in the art for a technique to improve image quality for an enlarged field of view (FOV).

The invention proposes a technique for improving image quality for an enlarged field of view (FOV). The technique includes detector module geometry of an X-ray computed tomography (CT) system that eliminates gaps between modules. The detector modules are on multiple plans instead of one circular arc of conventional CT geometry, where outer modules are closer to the object, the inner ones are further. FIGURE 1 depicts proposed geometry of detector modules in comparison to that of conventional geometry in a CT system.

The functioning of the proposed detector module geometry is illustrated in FIGURE 2. Taking, for example, five modules, such that, view angles are α1, α2 and α3, the view...