Mrso stuvia Study guides, Class notes & Summaries

Purpose of RF (B1) field - Answer excite hydrogen protons RF energy is absorbed by tissues - Answer within the volume of the RF transmit coil. This is a thermogenic process. Thermogenic process - Answer Results in production of heat. Ex: RF energy absorption MRI local and whole-body tissue heating is due to - Answer magnetic induction Types of RF coil designs - Answer -linearly polarized -circularly polarized (quadrature) Function of coils - Answer -transmit only -receive only ...

IEC DB/DBA limits for MRI - Answer 140 DB 99 DBA parameters to reduce noise in MRI - Answer -thicker slices -larger FOV -smaller matrix -parallel imaging -reducing bandwidth (increasing TE) -active noise reduction -Low SAR RF mode (increase in echo spacing)-thicker slices MRI sequence that produces the most and least noise in MRI - Answer Most noise EPI/DWI least noise spin echo sequence an increase in slew rate and gradient amplitude causes an increase in - Answer Peripheral ...