Weight used for partially scanning for quantum segmental multi-sectional CT imaging

A technique of CT scanning, pitch, used in the direction of instruments used for radiological diagnosis, computerized tomography scanners, generation of 2D images

Inactive Publication Date: 2005-09-07
GE MEDICAL SYST GLOBAL TECH CO LLC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if there is enough instantaneous resolution to allow seeking a minimum range of source angles in 180+ sector angles (π+2Γ), it is not always possible to achieve this minimum due to scanner speed and patient heart rate constraints

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Weight used for partially scanning for quantum segmental multi-sectional CT imaging
  • Weight used for partially scanning for quantum segmental multi-sectional CT imaging
  • Weight used for partially scanning for quantum segmental multi-sectional CT imaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Referring to Figure 1 and figure 2 A computed tomography (CT) imaging apparatus 10 includes a gantry 12 representing a "third generation" CT scanner. The gantry 12 contains an x-ray source 14 which emits a beam of x-rays 16 towards a detector array 18 on the gantry 12 on the opposite side thereof. The detector array 18 consists of detector units 20 which detect X-rays emitted after passing through an object 22, such as a medical patient. The detector array 18 can be assembled in a single-slice or multi-slice configuration. Each detector unit 20 produces an electrical signal indicative of the beam-attenuated intensity of the active X-ray beam after passing through the patient 22 . During a scan in which X-ray projection data is collected, the gantry 12 and the components fixed thereto rotate about a center of rotation 24 .

[0025] The rotation of the gantry 12 and the operation of the X-ray source are managed by a control mechanism 26 of the CT apparatus 10 . The co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

In one embodiment, the present invention is a method for reconstructing an image from a set of projection data acquired in a computed tomgraphic (CT) scan of an object (22). The method includes the steps of: selecting a pitch in a range between a zero pitch and a high-speed (HS) pitch; helically scanning the object with a CT imaging system (10) having a multislice detector (18) and a moving radiation source (14), at the selected pitch, to acquire projection data; helically interpolating the acquired projection data; to generate or synthesize projections in a plane of reconstruction for a source angle beta spanning a partial scan angle; applying a partial scan weight WPS written as: WPS( beta , gamma ) = beta -< pi >/2+ GAMMA /2( GAMMA - gamma )    beta inf = < pi >/2- GAMMA ≤ beta ≤ beta <-> = < pi >/2+ GAMMA -2 gamma WPS( beta , gamma ) = 1.0    beta <->≤ beta ≤ beta <+> = 3< pi >/2- GAMMA -2 gamma WPS( beta , gamma ) = 3< pi > /2+ GAMMA - beta /2( GAMMA + gamma )    beta <+>≤ beta ≤ beta sup = 3< pi >/2+ GAMMA to the generated or synthesized projections in a plane of reconstruction, where gamma is a fan angle, beta a source angle, and GAMMA a maximum fan angle; and filtering and backprojecting the weighted projections.

Description

technical field [0001] The present invention relates to a computerized tomography (CT) imaging method and its device, in particular to a method and its device for reconstructing an object image based on partial scanning. Background technique [0002] In at least one known computed tomography (CT) imaging apparatus, an X-ray source projects a fan-shaped beam that is collimated to lie in the X-Y plane of a Cartesian coordinate system, commonly referred to as the "imaging plane". flat". X-rays pass through the object to be imaged, such as a patient. The beam attenuated by the object impinges on the radiation detector array. The radiation intensity of the attenuated beam received by the detector array depends on how attenuated the X-rays are by the object. Each detector element in the detector array produces a separate electrical signal at the detector location which measures the degree of beam attenuation. Individual attenuation measurements are collected from all detectors...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03G06T11/00
CPCY10S378/901G06T11/005G06T2211/421A61B6/027
Inventor G·M·贝森
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap