Andreas Heinrich1, Jens Rump1, Felix Gttler1, Christian Seebauer2, Bernd Hamm1, Ulf Teichgrber1
1Department of Radiology,
For a non-invasive assessment of the birth process under MR control, an MR-compatible cardiotocograph (CTG) was developed and tested for a safe monitoring of physiological parameters (heart rate, uterine contraction). Voltages generated by the MRI led to disturbances of heart rate data, whereas uterine contraction data were minor influenced. The effects of spoiled and balanced gradient-echo sequences on CTG was examined. Disturbances caused by MRI mainly depends on repetition time (TR). In order to overcome this, a MR-noise-filter (TR-dependend frequency comb filter and a low pass filter) was developed and analyzed. As a result, the fetal heart rate as well as the uterine contraction could be assessed clearly during MR image acquisition.