Unit 5 Quiz Flashcards
What is the purpose of spatial encoding in MRI?
To assign spatial locations to image signals
In MRI, what is the function of the magnetic field gradients during spatial encoding?
To vary the resonant frequency of spins along different directions
Which gradient is responsible for dividing the object into slices along the z-axis?
Slice-select gradient
The process of assigning spatial locations to the signals in the phase-encode direction is known as:
Phase encoding
What is the role of the readout gradient in spatial encoding?
Encodes spatial information in the frequency direction
In MRI, the matrix size refers to the number of pixels in:
Two-dimensional space
In MRI, the readout gradient is applied during which part of the imaging sequence?
When signal is received
Once the slice is selected, the signal is located or __________ along both axes of the image.
Encoded
The position of a nucleus along a gradient can be identified according to its _______?
Precessional frequency
To give each slice a thickness, a _______ of nuclei must be excited by the excitation pulse.
Band
The frequency encoding gradient is switched on when the signal received & is often called the _____________
Readout gradient
Enough frequencies must occur during readout to achieve sufficient data points. This is determined by the ______________
Receive bandwidth
