Patent ID: 6768917
Filing Date: 2004-07-27
Classification: A61B,G01R

Abstract:
A method of forming a magnetic resonance image of an object to be examined, comprising the steps of:inserting a microcoil into the object being examined, determining the position of the microcoil, determining a geometrical relationship between the position of the microcoil and the object being examined, acquiring reference magnetic resonance signals at a reference temperature after the microcoil is inserted into the object being examined, after the magnetic resonance signals at the reference temperature are obtained, increasing the temperature in an area proximate the microcoil and acquiring measuring magnetic resonance signals after the temperature in the area proximate the microcoil has been increased, determining a temperature dependent chemical shift upon comparison of the measuring magnetic resonance signals to the reference magnetic resonance signals, determining a local variation in temperature, in the area proximate the microcoil, on the basis of the temperature dependent chemical shift and the determined position of the microcoil, reconstructing the magnetic resonance image from the acquired magnetic resonance signals and on the basis of the determined position of the microcoil, the reconstruction step including reconstructing a reference magnetic resonance image from the reference magnetic resonance signals and reconstructing a measuring magnetic resonance image from the measuring magnetic resonance signals, reproducing a detail of the object being examined and an indication of the position of the microcoil together in the magnetic resonance image, and deriving a correct position of the detail of the object being examined in the magnetic resonance image relative to the indication of the position of the microcoil on the basis of the position of the indication of the position of the microcoil and the determined geometrical relationship between the position of the microcoil and the object being examined.