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Fundamentals

MRI fundamentals

QuestionAnswer
A positive change in frequency followed by an equal negative change in frequency, both for the same duration, will________ the net phase of stationary protons? have no effect on
which of the following is a linearly varying magnetic field?a. raw datab. a gradientc. a gradient
which physical gradient must be used for slice selection in order to produce a sagittal image? x gradient
The slice select gradient must be turned on turned on during which of the following events? application of RF energy
Which of the following is NOT determined by the slice select process? field of view
which of the following has an effect on the resulting slice thickness? the range of frequencies at which the RF energy is applied
To make an oblique image which is oriented at an angle between transverse and coronal, which of the following physical gradients must be applied for slice select gradient? y and z together
Given a sagittal image, which of the following statements is ALWAYS TRUE? slice selection was accomplished with the x-gradient
The frequency encoding gradient must be turned on during which of the following events? readout of the echo
In a vertical field magnet, which axis corresponds to the longitudinal direction, if the patient is in a head-first, supine position? y axis
To completely phase encode a single slice, how many TR periods are required? as many TR periods as phase line in the resulting image matrix. (phase encodings)
During a six minute scan, when is the data used to form the lower third of the image collected? throughout the entire scan
Created by: martinezjg