Method and MR device for simulating electrical simulations in a subject by MR stimulation

US6169403A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Franz Hebrank · Herzogenaurach, DE
• Matthias Gebhardt · Erlangen, DE
• Helmut Lenz · Tutzing, DE

Key dates

• Filing date: Apr 27, 1999
• Grant date: Jan 2, 2001
• Expiry date: Apr 27, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/385
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method or apparatus for the simulation of electrical stimulations in an examination subject which are generated by rapidly switched gradient fields of an MR device, and wherein aborting of the executed measuring sequence occurs given the crossing of a threshold value in an online monitoring, wherein the crossing of the threshold value is signaled prior to the execution of the measuring sequence in a look-ahead monitoring, at least one gradient signal G(t) is determined which is defined by the time characteristic of the gradient pulses, at least one first filtered gradient signal G.sub.F1 (t) is formed by filtering the gradient signal G(t) with a first filtering function f.sub.F1 (t) a stimulation signal Stim(t) is formed which describes the stimulation of the examination subject, from the first filtered gradient signal G.sub.F1 (t), and the stimulation signal Stim(t) is compared to a definable stimulation threshold value Stim.sub.lim. If Stim.sub.lim is exceeded an indicator indicating that a stimulation has occurred is emitted.