Hugo Kroeze1, Irene M.L. van Kalleveen1, Marielle E.P. Philippens2, Onne Reerink2, Peter R. Luijten1, Dennis W.J. Klomp1
1Radiology, UMC Utrecht, Utrecht, Netherlands; 2Radiotherapy, UMC Utrecht, Utrecht, Netherlands
An experimental thin rectal probe was developed for high field MRI. At 300 MHz short electrical dipoles and monopoles can be used instead of conventional coils, making the antenna very thin. This allows insertion of the antenna in narrow lumina. Simulations showed that with an RF power of 25 W a B1+ of 10 uT could be obtained at a distance of 20 mm from the antenna. This was confirmed in a phantom experiment. High resolution FFE images were obtained with this antenna rectally inserted in a healthy, male volunteer.