RF Coils: Use and Safety Part 1

RF coils can differ in their function. Which of the following is NOT a functional configuration for an RF coil?. Transmit only. Receive only. Static only. Transmit and Receive (T/R).

In terms of design, RF coils are categorized as being either linearly polarized or: Triangulated. Circularly polarized (Quadrature). Digitally polarized. Magnetically shielded.

Why is it visually difficult to tell the difference between a receive-only coil and a transmit-and-receive coil?. They are always the same color. Depending on the vendor, they can have very similar physical appearances. They both require liquid helium cooling. They are both built into the floor of the room.

According to the video, what is the most important practice to ensure everyone knows whether they are using a receive-only or a T/R coil?. Memorizing the user manual. Only using one type of coil in the facility. Asking the patient which coil they prefer. Ensuring coils are appropriately and properly labeled.

What is the role of the integrated body coil when a separate receive-only coil is being used?. It acts as the transmit coil. It remains completely dormant. It records the patient's heart rate. It cools the room temperature.

What does the system software do to a receive-only coil while the body coil is transmitting RF energy?. It increases the power to the receive-only coil. It "detunes" the coil to prevent current induction. It physically moves the coil away from the patient. It turns off the main magnetic field.

Why is it dangerous to leave a receive-only coil inside the magnet bore if it is NOT plugged in?. The patient might trip over it. The system does not know it is there and will not detune it during RF transmission. It will cause the liquid helium to boil off instantly. It makes the images look too bright.

What is the "least" severe consequence of scanning a receive-only coil that is not physically connected to the magnet?. A software update will be required. The patient will experience a minor headache. The coil will be damaged or destroyed (rendered worthless). The scanner will simply turn itself off.

What is the "worst-case scenario" mentioned in the video if an unplugged receive-only coil is left in the bore during a scan?. The lights in the room will flick. The coil could catch fire. The MRI computer will delete all patient data. The table will lock in place forever.

If you are not planning to use a specific RF coil for a scan, what is the best safety practice?. Hide it behind the gantry. Ensure it is either plugged in or completely removed from the magnet. Lay it on the floor inside the magnet room. Wrap it in a wet towel.