Patients with Implants and Devices

Which organization defines the standardized MRI labeling terms used by both the FDA and the IEC?. ACR (American College of Radiology). ASTM International. AMA (American Medical Association). ISMRM (International Society for Magnetic Resonance in Medicine).

Which of the following terms is NO LONGER considered a valid or defined term for describing MRI implants?. MR Safe. MR Conditional. MR Compatible. MR Unsafe.

According to the video, which materials would typically be labeled as "MR Safe"?. Titanium and Stainless-Steel. Wood, glass, and plastic. Pacemakers and Heart Valves. Copper and Aluminum.

What is the critical requirement for a device labeled as "MR Conditional"?. It can be scanned in any magnet as long as it's not a 3T system. It is safe only within specifically defined conditions of use. The patient must sign a waiver before the scan. It must be removed from the patient before the scan.

A heart valve has a condition of "Maximum whole-body average SAR of 2.0 W/kg for 15 minutes of scanning." What does this 15-minute limit typically refer to?. The total duration of the entire MRI appointment. The maximum length of any single pulse sequence. The time the patient is allowed to stay in the magnet room. The time required for the device to cool down between scans.

If you cannot identify a specific implant, how should you assess the risk of torque forces from the static magnetic field?. Assume it is non-ferrous unless it sticks to a handheld magnet. Torque is not a concern if the item is made of titanium. Torque is only a concern for items larger than 10 cm. Assume it is ferromagnetic unless you can prove otherwise.

Which magnetic field is primarily responsible for causing vibration in conductive (but not necessarily ferrous) metallic implants?. The Static Magnetic Field (B0). The RF Field (B1). The Switched Gradient Magnetic Fields. The earth's magnetic field.

According to the ACR guidance document, who is NOT considered a reliable source for determining if an implant is safe for MRI?. The Medical Director of the MRI facility. Level 2 MRI Personnel. The referring physician or the implanting surgeon. The attending MRI Radiologist.

Where is an implant most likely to experience the most significant gradient switching (and thus the highest risk of vibration or induced current)?. At the exact center (isocenter) of the magnet. Close to or at the ends of the gradient coil. Outside of Zone IV. The location does not matter if the magnet is on.

What is the primary concern when a metallic lead or wire is exposed to the RF (B1) field?. It will become permanently magnetized. It will dissolve in the patient's bloodstream. Thermal heating due to induced currents. It will change the patient's blood type.