R Salomir1, M Viallon1, Joerg
Roland2, Sylvain Terraz1, Denis Morel3, CD
Becker1, P Gross2
1Radiologie, Hopital Universitaire de
Genve, Geneva, Switzerland; 2Siemens Medical Solutions, Erlangen,
Germany; 3Anesthesiology, University Hospitals of Geneva, Geneva,
Switzerland
A
new method for reference-less MR thermometry is described based on the
fundamental theoretical frame of harmonic functions. The method was
implemented for a thin open border and validated for 2D situation with HIFU
heating in phantoms and in vivo rabbit thigh, and also with baseline
acquisition in volunteers liver. Measurement accuracy in liver under free
breathing was as good as 0.5C for 0.3 seconds temporal resolution. The
method is insensitive to periodic or accidental motion, tissue expansion or
drift, and to external perturbation from interventional device.
Keywords