Amri 310 week 6 knowledge check
___ are designed with additional loops and circuitry to improve the efficiency
with which the MR signal is induced in the coil - correct answer ✔Quadrature
coils
A disadvantage of GRE is that it doesn't provide a good signal (SNR) and
therefore the image is grainer - correct answer ✔True
CSE sequences have the advantage of shorter scan times - correct answer
✔False
Which describes a phased array coil? - correct answer ✔Set of receive coil
channels that appear to overlap within the coil cover
Typically surface coils can only__ signal - correct answer ✔Receive
Typically ___ coils can transmit RF and receive MR signal - correct answer
✔volume
_____________ coils are two surface coils that work in tandem using the
same receiver/circuitry. - correct answer ✔helmholtz pair
Which is not a type of coil architecture? - correct answer ✔multi-slice
Maximum signal is produced in the receiver coil when the net magnetization is
tipped - correct answer ✔90 degrees
, ___ is the conventional symbol for the radio frequency field strength - correct
answer ✔B1
The coils inside the scanner that are closer to the patient are the ______ coils
- correct answer ✔Rf
All of the following are examples of surface coils except - correct answer
✔Head coil
Which of the following coils yields the high SNR of a sensitive, small surface
coil, yet covers a large area ? - correct answer ✔Phased array coil
Which type of RF coil is much more efficient in the transfer of RF energy to
the patient ? - correct answer ✔
The multi-turn solenoid, bird cage coil, single turn solenoid, and saddle coil
are typically operated as ___ of RF energy - correct answer ✔Transmit and
receive
Parallel imaging causes the MRI scanner to sample twice as many phase
encoding steps, thus increasing scan time. - correct answer ✔False
Which coil is most useful when imaging the prostate on a 1.5 T scanner ? -
correct answer ✔Endorectal coil
The frequency of the radio frequency coil is defined by the __ relationship -
correct answer ✔Larmor
___ are designed with additional loops and circuitry to improve the efficiency
with which the MR signal is induced in the coil - correct answer ✔Quadrature
coils
A disadvantage of GRE is that it doesn't provide a good signal (SNR) and
therefore the image is grainer - correct answer ✔True
CSE sequences have the advantage of shorter scan times - correct answer
✔False
Which describes a phased array coil? - correct answer ✔Set of receive coil
channels that appear to overlap within the coil cover
Typically surface coils can only__ signal - correct answer ✔Receive
Typically ___ coils can transmit RF and receive MR signal - correct answer
✔volume
_____________ coils are two surface coils that work in tandem using the
same receiver/circuitry. - correct answer ✔helmholtz pair
Which is not a type of coil architecture? - correct answer ✔multi-slice
Maximum signal is produced in the receiver coil when the net magnetization is
tipped - correct answer ✔90 degrees
, ___ is the conventional symbol for the radio frequency field strength - correct
answer ✔B1
The coils inside the scanner that are closer to the patient are the ______ coils
- correct answer ✔Rf
All of the following are examples of surface coils except - correct answer
✔Head coil
Which of the following coils yields the high SNR of a sensitive, small surface
coil, yet covers a large area ? - correct answer ✔Phased array coil
Which type of RF coil is much more efficient in the transfer of RF energy to
the patient ? - correct answer ✔
The multi-turn solenoid, bird cage coil, single turn solenoid, and saddle coil
are typically operated as ___ of RF energy - correct answer ✔Transmit and
receive
Parallel imaging causes the MRI scanner to sample twice as many phase
encoding steps, thus increasing scan time. - correct answer ✔False
Which coil is most useful when imaging the prostate on a 1.5 T scanner ? -
correct answer ✔Endorectal coil
The frequency of the radio frequency coil is defined by the __ relationship -
correct answer ✔Larmor
