Control method for SAR-optimized activation of a coil array

US7847550B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dirk Diehl · Erlangen, DE
• Juergen Nistler · Erlangen, DE
• Wolfgang Renz · Erlangen, DE
• Markus Vester · Koblenzer Straße, DE
• Sebastian Wolf · London, GB

Key dates

• Filing date: Jan 14, 2009
• Grant date: Dec 7, 2010
• Expiry date: Apr 19, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/288
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A control device for a magnetic resonance system activates the coils of a transmission array and a gradient magnet system of the magnetic resonance system by causing an excitation pulse to be supplied to each coil. A magnetization that exhibits a first actual inhomogeneity thereby is generated in an excitation volume of the magnetic resonance system. The control device determines the excitation pulse for each coil using a start pulse and a maximum allowable inhomogeneity. The respective start pulse has a total time duration. When the control device activates the coils of the transmission array and of the gradient magnet system corresponding to the start pulse, a magnetization that exhibits a second actual inhomogeneity that is smaller than the maximum permissible inhomogeneity is generated in the excitation volume. The control device determines an intermediate point of the start pulse so that the respective start pulse is divided into a first pulse part and a second pulse part that is complementary to the first pulse part. The first pulse part corresponds to a respective low-energy portion of the start pulse, the second pulse part with a high-energy portion of the respective start …