Bertine L. Stehouwer1, Wybe J.M. van der Kemp1, Peter R. Luijten1, Maurice A.A.J. van den Bosch1, Wouter B. Veldhuis1, Jannie P. Wijnen1, Dennis W.J. Klomp1
1Radiology, University Medical Center Utrecht, Utrecht, Netherlands
We investigated the phosphomonoester / phosphodiester ratio in the breast of healthy females, and the influence of the menstrual cycle on the ratio, using 31P magnetic resonance spectroscopy at 7.0 Tesla. Five premenopausal and five postmenopausal women were included. A variation in ratios was seen throughout the menstrual cycle, however no particular pattern could be objectified. The ratio always remained <1. When using 31P MRS in a clinical setting a variation between women and between moments in the menstrual cycle has to taken into account.