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MR Physics Services

MR plays an important and expanding role in diagnostic healthcare. Clinical Scientists can provide the MR physics support that is crucial to the development of new and existing MR techniques in an effective, safe and time-efficient manner. Established since 1986, the MR Physics group at Guy’s and St Thomas’ offers the following services.


We can provide the role of MR Safety Expert, advising on a range of MR safety issues to help establish and maintain safe working practices for your patients and staff.

MR protocol development

We can provide physics support to review existing clinical protocols, using technical knowledge and understanding of the latest developments and evidence base to highlight areas that have potential for improvement in terms of quality and/or time efficiency. We offer support for sites wishing to set up new MR services incorporating advanced MR techniques, such as MR-guided breast biopsies, cardiac MRI, functional MRI, brain perfusion and MR spectroscopy.

Purchasing and site planning

We can advise and provide support to sites on the procurement of MRI systems and system upgrades to help decide the appropriate level of functionality to meet your needs.

Acceptance testing & quality assurance

We offer acceptance testing of all clinical MRI systems on site using appropriate test phantoms and analysis software, including mapping of the magnetic fringe field. We can repeat assessments as part of an annual QA as well as help you to set up and audit a more regular QA program.

Geometrical distortion measurements

We can make a detailed assessment of the system-based distortions of an MR scanner to assist with the use of MRI for surgical, radiotherapy treatment and biopsy planning purposes.

RF cage checks

We can perform measurements of RF attenuation for MRI scanning rooms, typically with the magnet on field, avoiding the significant costs and system downtime associated with ramping down the magnet.

Acoustic noise measurements

We can measure acoustic noise, both inside and outside the scan room, to determine the expected noise exposure of staff and patients.


The MR Physics group has a wealth of teaching experience, contributing to several graduate and postgraduate courses as well as BAMRR and BIR study days and other national and international meetings. We can cover the basic concepts of MR to advanced cutting-edge techniques and their clinical applications. Teaching sessions can be provided covering general or specific aspects of MR physics as required.