Module 5: RF Coils & Ancillary Equipment Used in Brain & Neck Imaging Flashcards
(10 cards)
Ideally how should a RF be placed for brain and neck imaging?
It should be centered to the anatomy, parallel to the Z-axis and if possible, as close to the middle of the bore of the magnet as possible to minimize Bo and B1 magnetic inhomogeneity.
The benefit of phased array coils is that they have the sensitivity of smaller coils, with the ability to cover _____
a) small areas
b) cover large areas
c) cover all areas
d) cover small blemishes
cover large areas.
True or false, temporomandibular joint (TMJ) imaging require surface coils.
True
surface coils perform best when they are ___ degrees to the Z-axis because they are a linear RF coil.
90
Remember to use the coil within its limits. Match the field-of-view to the size of the coil and anatomy of interest to prevent _____ artifact. Do not cross or loop coil cables. Inspect the coil for wear, and never use a coil with exposed wiring. Do not use the inherent body coil with a transmit-receive coil in the bore. Always follow safe MR scanning procedures.
wrap
Which of the following is correct when using a coil?
a) Match the FOV to the size of the coil
b) Make sure to cross or loop coil cables
c) use an inherent body coil with a transmit-recieve coil in the bore
d) a coil with exposed wiring may be used
a) match the FOV to the size of the coil to prevent wrap artifacts
What is a Contrast Media Power Injector and when would you use one in an MRI environment?
Dynamic scans or contrast-enhanced angiography sequences need injectors because of the need to control timing, bolus volume and flow rate.
By being able to control these three settings, you can better visualize pathologies such as a dynamic pituitary scan or maximize enhancement in an MR-angiogram. These injectors also have safety features such as pressure limits and prompt the user if it is not safe to use.
What is a Drug Infusion Pump used for?
MRI infusion pumps are available for patients that need continuous IV infusion within the MRI environment.
This device comes with the ability to choose from a drug library and allows technologists to program a set dose, concentration and time based on patient weight.
What do Patient Monitoring Systems monitor?
patients from the critical care ward may need to be monitored during their exam. Monitoring devices have the capability to measure ECG, pulse rate, pulse oximetry, blood pressure from cuff or arterial line. They provide figures, waveforms and alarms. Accompanying physicians and nurses will assess vital signs with these waveforms during their exam.
What does an Anesthesia Machine do?
The machine includes a ventilator that helps intubated patients breathe. This machine is commonly used in intensive care unit patients under general anesthesia (ie. Propofol) who are intubated. Other uses include outpatients who need to be under general anesthetics to have their exam completed, ussually due to claustrophobia or if the patient is in too much pain.
