Patent · US Expired

Computer tomography apparatus with a conical radiation beam and a helical scanning trajectory

US6269141A · kind A · utility

34Cited by

4References

6Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Roland Proksa · Hamburg, DE
Jan Timmer · Cologne, DE

Key dates

Filing date	Aug 5, 1999
Grant date	Jul 31, 2001
Priority date	—
Expiry date	Aug 5, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG01N2223/419
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention relates to a computer tomography apparatus in which the scanning trajectory is shaped as a helix and a conical radiation beam traverses the examination zone. According to the invention, the dimension of the detector window (or the part thereof which is used for the reconstruction) is a factor of 3, 5, 7 . . . larger than the distance between neighboring turns of the helix. Using this geometry, each voxel in the examination zone is irradiated exactly from an angular range of 3.pi., 5.pi., 7.pi. . . . when it traverses the cone beam. Such data acquisition yields an improved image quality.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.