Magnetic resonance imaging method with adherence to SAR limits

US6759847B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerhard Brinker · Erlangen, DE
• Wolfgang Renz · Erlangen, DE

Key dates

• Filing date: Oct 11, 2002
• Grant date: Jul 6, 2004
• Expiry date: Oct 11, 2022

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/055
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method for magnetic resonance imaging with adherence to SAR limit values, a patient is charged with a radio-frequency pulse sequence via at least one transmission antenna for the implementation of a measurement in a magnetic resonance tomography apparatus, and the magnetic resonance signals that are produced are acquired in a spatially resolved manner via at least one reception antenna and are further-processed for producing magnetic resonance images or spectra. SAR values are determined before the implementation of the measurement on the basis of patient data and the position of the patient relative to the transmission antenna for planned parameters of the measurement, and the parameters are modified as needed until the SAR values lie within the SAR limit values. The position of the patient relative to the transmission antenna is exactly determined by an imaging magnetic resonance pre-measurement. The method enables adherence to the SAR limit values without having to take large tolerances into consideration. No additional hardware whatsoever and no positioning rule for the user are required for the realization of the method.