Surface Coils Flashcards
a ______ coil has a 2 pair of signal detectors offset 90° to each other
Quadrature
True or false:
A T/R coil is easily recognizable compared to a receive coil.
False
Between a 10cm diameter coil & a 15cm diameter coil, which one will yield the highest SNR closest to the coil? (all other factors remaining the same)
10cm coil
the coverage, or penetration sensitivity of a coil is roughly _____ it’s diameter.
1/2
the smaller the coil, the ________ the SNR, but the _______ the coverage.
higher SNR
Smaller coverage
True or false:
The body coil is a type of surface coil
False
True or False:
it is permissible to wrap exposed or frayed wires of a surface coil tightly with approved electrically insulating tape & use the coil until the field service engineer can make a full repair.
False
True or False:
A coil with multiple elements or channels all linked into a single receiver is referred to as a “phased array” coil.
False
In mose MR imaging, _______ transmits the B1 to the patient.
the body coil
What is the main purpose of a surface coil?
Increase SNR
The RF signal transmitted to the patient is an oscillating magnetic field and is referred to as the _________.
B1
Unless specifically stated otherwise by the manufacturer, surface coils placed inside the bore of the system must be ______ in order to reduce the risk of a patient burn.
plugged in
________ is when more than one coil element or channel is connected into a single receiver.
multiplexing
Compared to the body coil, a transmit/receive coil has a ______ B1 field
Smaller
Unless specifically deemed safe by the manufacturer, T/R coils must be _________ when using the body coil to transmit RF.
Removed from the bore.
