Objective - MR examination during quantitative muscular exercise is currently unavailable because the MR instrument has a long gantry and exercise machines are made from ferromagnetic materials such as iron. The purpose of this study was to develop a quantitative, continuously monitored, voluntary isometric exercise device (QIED) for MR examination and to analyse the feasibility of performing MR examination using the new device. Methods and results - The QIED, which consists of 1) a handgrip (rubber cuff), 2) an extension plastic tube, 3) a pressure transducer, and 4) a pressure digital display that includes the power supply. Components 1 and 2 are non-magnetic. Although components 3 and 4 are ferromagnetic, they can be set up outside the MR examination room using component 2 to prevent them from influencing the MR instrument and examination. We did not observe MR image noise or artifacts in the phantom study using the QIED. MR examination and low sensitivity 31P-MRS could be feasible during quantitative isometric exercise using the QIED. Conclusion - Exercise MR examination using the QIED will provide useful information for the detailed evaluation of cardiac patients.
- Magnetic resonance imaging
- Phosphorus-31 magnetic resonance spectroscopy
- Stress exercise
- Ventricular function