Patent · US Expired

Adaptive dose modulation during CT scanning

US5867555A · kind A · utility

55Cited by

5References

7Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Stefan Popescu · Erlangen, DE
Dietmar Hentschel · Vacha, DE
Karl-Ernst Strauss · Dormitz, DE
Heiko Wolf · Thalwil, CH

Key dates

Filing date	Mar 4, 1997
Grant date	Feb 2, 1999
Priority date	—
Expiry date	Mar 4, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG01N2223/612
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In a method for reducing a radiation dose in an x-ray CT (computed tomography) system, a maximum x-ray attenuation per projection is computed for every projection or for every n.sup.th projection and the measured angular attenuation profile for a last half rotation of the x-ray beam around a subject is stored, an extrapolation method is conducted for computing an extrapolated attenuation profile for a next half rotation based on the measured angular attenuation profile for the last half rotation, and a process is conducted for setting a dose level for the x-ray beam for a next projection, based on the extrapolated attenuation profile. The x-ray beam can be modulated, with characteristics of the beam modulation being set or controlled dependent on the extrapolated attenuation profile.

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