1Department of Medical Physics, Maria Skodowska-Curie Memorial Cancer cenetr and Institute of Oncology, Gliwice, Poland; 2Helimed Diagnostic Imaging, Katowice, Poland; 3Helimed Diagnosic Imaging, Katowice, Poland; 4Maria Skodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice, Poland
The puropse of this work was to assess long-term variability of magnetic resonance spectroscopy in vivo using a standard brain phantom. The measurements were performed from April 2006 to September 2009. Short and long echo time spectra were acquired from the volume of interest located in the isocentre. The total number of spectra measured for short echo time was equal to 99, while for long echo time 96. LCModel software was used for estimation of the metabolite levels. Coefficients of variation did not exceed the value of 6% for any metabolite over three years of the experiment.