quiz 4 Flashcards
Gradients serve many functions in MRI. Select all that apply to them.
Slice selection
Phase encoding
Frequency encoding
Which gradient(s) are used gradient produce an oblique view of anatomy in MRI ?
A combination of 2 gradients are used
The two points along a gradient contain a range of frequencies. This band of frequencies are called?
bandwidth
The range of frequencies the RF pulse sends in to match the band of frequencies along our slope is termed?
transmit bandwidth
When increasing your slice thickness from 3mm to 10mm select the two items needed to achieve this.
Shallow slope of the gradient.
broad transmit bandwidth
Which gradient is turned on during the echo (signal)?
frequency encoding
Frequency encoding typically is along the long axis of the anatomy.
true/false
true
Phase encoding is typically along the short axis
true false
true
The frequency encoding gradient is also called the?
readout gradient
The steepness of the slope of the read out gradient will determine the Frequency Field of View
true/false
true
A steep phase encoding gradient results in large phase shifts
true/false
true
The amount of time the read out gradient is left on is known as the acquisition window.
true/false
true
The frequency matrix and the acquisition window are somewhat related
true/false
true
The rate at which we sample and store data points is commonly called.
sampling frequency
The sampling frequency is determined by the Nyquist theorem.
true/false
true
