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Questions and Answers
What is the unit of K space?
What is the unit of K space?
- Tesla
- Radiants per cm (correct)
- Hertz
- Amperes per meter
How are data collected and stored in K space?
How are data collected and stored in K space?
- After performing frequency or phase encoding (correct)
- Through a separate storage device
- Directly from the signal receiver
- By converting MRI signals to digital format
What does the center of the echo represent in the frequency axis of K space?
What does the center of the echo represent in the frequency axis of K space?
- Zero signal amplitude
- Variable signal amplitude
- Minimum signal amplitude
- Maximum signal amplitude (correct)
How are the central lines of K space filled with data?
How are the central lines of K space filled with data?
What is the purpose of altering the slope of the phase encoding gradient after each TR?
What is the purpose of altering the slope of the phase encoding gradient after each TR?
Flashcards
What is the unit of K space?
What is the unit of K space?
The unit of measurement for K-space, representing the spatial frequency of the signal.
How is data collected and stored in K space?
How is data collected and stored in K space?
Data is collected by applying frequency and phase encoding gradients to manipulate the signals from the spins in the body.
What does the center of the echo represent in the frequency axis of K space?
What does the center of the echo represent in the frequency axis of K space?
The central line of K space represents the strongest signal received from the center of the object being scanned.
How are the central lines of K space filled with data?
How are the central lines of K space filled with data?
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What is the purpose of altering the slope of the phase encoding gradient after each TR?
What is the purpose of altering the slope of the phase encoding gradient after each TR?
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Study Notes
K Space Basics
- The unit of K space is cycles per centimeter (cycles/cm).
Data Collection and Storage in K Space
- Data is collected in K space by sampling the magnetic resonance signal in a Cartesian grid.
- The data is stored in a 2D array, with each point representing the spatial frequency-domain information.
Center of the Echo in K Space
- The center of the echo represents the zero-frequency point in the frequency axis of K space.
Filling the Central Lines of K Space
- The central lines of K space are filled with data through the process of encoding, which involves the manipulation of magnetic field gradients.
Purpose of Altering the Phase Encoding Gradient
- Altering the slope of the phase encoding gradient after each TR (repetition time) is done to fill in the rest of the K space, allowing for the creation of a complete image.
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