5.1 This test method is one of those required to determine if the presence of a medical device may cause injury to individuals during an MR examination and in the MR environment. Other safety issues which should be addressed include but may not be limited to magnetically induced torque (see Test Method F2213) and RF heating (see Test Method F2182). The terms and icons in Practice F2503 should be used to mark the device for safety in the magnetic resonance environment.

5.2 If the device deflects less than 45°, then the magnetically induced deflection force is less than the force on the device due to gravity (its weight). For this condition, it is assumed that any risk imposed by the application of the magnetically induced force is no greater than any risk imposed by normal daily activity in the Earth's gravitational field. This statement does not constitute an acceptance criterion, however it is provided for a conservative reference point. It is possible that a greater magnetically induced deflection force can be acceptable and would not harm a patient. For forces greater than gravity the location of the implant and means of fixation must be considered. Magnetically induced deflection forces greater than the force of gravity may be acceptable when they can be justified for the specific case.

5.3 A deflection of less than 45° at the location of the maximum spatial gradient of the static magnetic field in one MR system does not preclude a deflection exceeding 45° in a system with a higher field strength or larger static field spatial gradients.

5.4 This test method alone is not sufficient for determining if a device is safe in the MR environment.