Siemens Safety Part 3

Why is it vital to ensure the patient's hands and legs are not touching or crossed during the scan?. To keep the patient from falling asleep. To prevent the formation of electrical current loops that can cause RF burns. To ensure the patient stays perfectly centered in the bore. To make it easier for the technologist to see the patient’s face.

What should be done for patients with tattoos or permanent makeup before the MRI begins?. The tattoos must be surgically removed. The area should be documented and can be covered with damp compresses to reduce heat risks. Tattoos are a complete contraindication, and the scan must be cancelled. The patient must wear a lead-lined sleeve over the tattoo.

Which safety device is given to the patient so they can signal for help at any time?. A metal whistle. A laser pointer. A squeeze bulb (call button). A handheld radio.

When positioning a patient using the laser-light localizer, what instruction must be given?. "Look directly at the red light.". "Keep your eyes closed.". "Breathe as deeply as possible.". "Hold your breath for one minute.".

For sedated or helpless patients, what is a mandatory safety requirement throughout the scan?. They must be left alone to ensure they stay asleep. They must be scanned without any coils attached. The MRI magnet must be turned to a lower power setting. They must be supervised by a nurse or trained healthcare professional for the entire duration.

What does the "Emergency Shutdown Switch" (Table/Electronics Stop) do?. It turns off the magnetic field completely. It disconnects the electronics from line voltage but does NOT turn off the magnet. It releases the liquid helium into the atmosphere. It automatically calls the fire department.

If a patient is physically trapped or caught between the table and the gantry, which button should be used?. The Table Stop / Manual Release button. The Quench button. The Intercom volume button. The Lights Off switch.

When should the "Magnet Stop" (Quench) button be pressed?. When the patient feels slightly warm. When there is a software error on the computer. Only in an extreme emergency presenting a risk of bodily harm or death from the magnetic field. Every time a scan is completed to save power.

What happens physically during a "Quench"?. The room is filled with fire-extinguishing foam. Superconductivity breaks down and the magnetic field dissipates within about 20 seconds as helium escapes. The electricity to the hospital is cut off. The patient table is ejected from the room at high speed.

After a quench has been triggered, what is the immediate priority for the staff?. To start cleaning the machine. To try and capture the escaping helium in bags. To evacuate the patient and personnel from the room immediately to avoid helium exposure. To call the billing department to report the expense.