CAMRT MRI In Practice Chapter 7 Protocol Optimization Exam Questions With Detailed Answers Graded A+

In MRI what is the main source of noise? - ACCURATE ANSWER-Thermal motion from the patient, it is also generated by background electrical noise of the system. What factors affect SNR (9) - ACCURATE ANSWER-Magnetic field strength proton density coil type and placement TR TE flip angle NSA receive bandwidth voxel volume B0 increases SNR ___________ - ACCURATE ANSWER-increases Proton density increases, SNR _____________ - ACCURATE ANSWER-Increases is it better for SNR to use a large or small coil? - ACCURATE ANSWER-the smallest coil possible for the body part should be used as noise is collected from the entire coil. Should the coil be placed parallel or perpendicular to B0? - ACCURATE ANSWER-perpendicular, in the transverse plane. As the TR increases SNR __________ - ACCURATE ANSWER-Increases (more mag is available to be flipped into the transverse plane).