Which of the following could cause an incident during an MRI scan?

Patient movement during the scan is indeed a significant factor that can lead to incidents during an MRI procedure. When a patient moves, it can cause blurring and artifacts in the resulting images, which may lead to diagnostic inaccuracies. In some cases, excessive movement can even necessitate the repetition of scans, increasing the time required for the procedure and potentially affecting patient comfort and safety.

Other options, while they may have implications for safety and effectiveness, do not generally cause incidents in the same manner. Non-ferromagnetic surgical clips are specifically designed to be safe for use in an MRI environment and do not pose a risk of being attracted by the magnet. MRI-compatible headphones are utilized to enhance patient comfort and communication during the scan, and they are designed to be safe to use inside the magnetic field. Properly secured IV lines are also crucial for patient safety and do not inherently pose a risk during the MRI scan as long as they are managed correctly. Thus, movement is the most direct factor that can lead to incidents in the context of an MRI.