hardware/instrumentation Flashcards
a 6 in surface coil (linear coil) is able to receive signal how deep in pt?
3 in (SNR penetration depth=1/2 of coil diameter
permanent magnets with a vertical magnetic field use surface coils that are ___ because the secondary magnetic field (B1) created by RF coils must be perpendicular to orientation of B0
solenoids
what is another word for a circularly polarized transmission or receiver coil with two orthogonal transmission or receiver channels?
quadrature
The CPU (central processing unit) used to plot and adjust slices in in an MR sequence in the ___
scan control room
The array processor is responsible for reconstructing the collected MR images/data using the FT, and is located in the ___
MR equipment room
The RF power amplifier is located within the ___
equipment room
doubling the field strength will ___ SNR
double
the intensity limit for static magnetic fields in clinical use is limited by the FDA to___ field strength for all patients, but ___ for all patients over one month of age
4T and 8T
doubling field strength results in a ___ increase in SAR potential
fourfold
liquid cryogens are cooled in a superconducting magnet at a temp of ___ ___ ___
4 Kelvin
270 degrees C
-452 degrees F
What information is obtained from QA?
- center frequency
- transmit gain
- SNR
- geometric accuracy
- low/high contrast spatial resolution
what does QA stand for and what goal does it stand for?
- quality assurance
- maintaining a desired level of consistency and image quality requirements in radiology
what does QC stand for and what does it reflect?
- Quality control
- the set of activities used to fulfill the requirements for quality.
what does SPT stand for?
system performance testing
What does PIQT stand for?
periodic image quality test
