MRI - K-space
14 important questions on MRI - K-space
What is a downside of thin slices?
How do you get k-space data? When do you get more information in the k-space? Does time play a role?
- When you add a gradient.
- You get more information when you use gradient echo (length of the gradient area determines how much k-space is sampled) => you get a full k-space line in stead of a halve.
- Time does not play a role.
How to go from picture to k-space?
- Each pixel will be transformed in to a pixel with a certain spatial frequency
- Then they will be placed on the k-space according to their spatial frequency.
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What happens when you take out the middel of the k-space?
What happens when you only take the center part of the k-space?
Which point is the k-space contain the highest signal to noise?
So you have three G(radiants) what do they mean?
- Gy = phase encoding => which line on the x-axis are we encoding
- Gx = read-out encoding (spatial frequency encoding) => negative and positive gradient for left and right. You start from the middle to one end and then form that end to the right.
When is the echo time with sequential encoding?
What is the impact of smaller slices?
How does echo planar imaging work?
•EPI creates multiple gradient echoes after one excitation (dynamic imaging)
•EPI suffers from large image distortions due cumulative k-space errors
Turbo spin echo?
?
•Multiple spin-echoes are used to generate multiple k-lines within 1 TR
•Due to T2 decay, each k-line has different T2-weighting, which acts as a blurring filter in image space.
What is the difference between 2D and 3D imaging?
- In 3D encoding there is are 2 phase encodings and 1 frequency encodings.
- In 2D there is only 1 phase encoding and 1 frequency encoding. The third one is are the longitudinal encodings (slices).
You can image a small part (Field of View). What happens then?
What happens when you take a smaller field of view?
Signals that are outside our field of view are going to show up in the image.
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