Many discharged patients who encounter other diseases that require MRI and CT examinations ask if they can have them done? Are they worried that the valves, wires and temporary pacemaker leads in their bodies will cause harm to their bodies? Will the test results be affected? Please rest assured that, if necessary, you can do these tests, the impact on the body (especially nuclear magnetic, there will be some thermal effects) is relatively small, generally will not cause substantial harm (before the examination, it is recommended to communicate with the examining doctor, if necessary, the need to adjust the parameters of the examination equipment can be examined, the majority of hospitals do not have the ability to check). The quality of imaging, there will be some impact (especially the heart valves and sternal wire position), but away from the heart valves and sternal wire position of the diagnostic results of the examination organs generally will not cause any impact.