Detuning of an RF shielded MRI scan room

A computer-readable medium carrying a computer program for optimizing a magnetic resonance imaging system, said system comprising a MR imaging apparatus comprising an open magnet system, wherein operation of the MR imaging apparatus creates a magnetic resonance field and generates resonance signals of a predetermined RF frequency, said system further comprising an RF cage, configured to enclose the MR imaging apparatus, wherein the walls of the RF cage are at least partly provided with a covering, said covering is configured in a way that a wavelength of the RF frequency within the covering is reduced, the computer program including instructions for optimizing a layout and/or position of the covering to reduce standing waves in the RF cage, when the computer program is executed in a computer.

A method of eliminating standing RF weaves at an MR frequency in an RF cage that surrounds an MR imaging apparatus, the method comprising:

• generating RF waves with the MR imaging apparatus at the MR frequency;
• reflecting the RF waves from walls of the RF cage;
• with a covering on at least one wall of the RF cage, reducing a wavelength of the RF waves in the covering such that the RF waves destructively interference to eliminate the standing RF waves at the MR frequency.