Podcast
Questions and Answers
What is in and out-of-phase imaging used for in abdominal imaging?
What is in and out-of-phase imaging used for in abdominal imaging?
- To identify fat-related pathology (correct)
- To identify bone-related pathology
- To identify muscle-related pathology
- To identify nerve-related pathology
What is the relationship between field of view and resolution?
What is the relationship between field of view and resolution?
- Increasing field of view increases resolution
- Increasing field of view decreases resolution (correct)
- Field of view has no effect on resolution
- Field of view only affects signal-to-noise
How does increasing the image matrix affect signal-to-noise ratio?
How does increasing the image matrix affect signal-to-noise ratio?
- Increases signal-to-noise
- Decreases signal-to-noise (correct)
- Has no effect on signal-to-noise
- Increases resolution
What parameter controls T2 contrast and decreases signal in the image?
What parameter controls T2 contrast and decreases signal in the image?
What does in-plane resolution define?
What does in-plane resolution define?
What parameter is used for diffusion-weighted imaging and allows us to view motion of molecules in the patient?
What parameter is used for diffusion-weighted imaging and allows us to view motion of molecules in the patient?
What are sat bands used for in MRI imaging?
What are sat bands used for in MRI imaging?
What is the relationship between receiving bandwidth and sample time in MRI?
What is the relationship between receiving bandwidth and sample time in MRI?
What is fat saturation used for in MRI imaging?
What is fat saturation used for in MRI imaging?
What parameter is used in phase-contrast imaging to measure blood flow velocity?
What parameter is used in phase-contrast imaging to measure blood flow velocity?
What can be a challenge when targeting fat saturation in MRI imaging?
What can be a challenge when targeting fat saturation in MRI imaging?
What does TI do in MRI?
What does TI do in MRI?
What is the center of k-space in MRI?
What is the center of k-space in MRI?
What is the difference between 2D and 3D imaging techniques in MRI?
What is the difference between 2D and 3D imaging techniques in MRI?
What is contrast in MRI?
What is contrast in MRI?
How does increasing the number of signal averages affect scan time?
How does increasing the number of signal averages affect scan time?
What is the appropriate TE value to achieve a T1 weighted image in MRI?
What is the appropriate TE value to achieve a T1 weighted image in MRI?
What is the parameter made up of phase encoding and frequency encoding and determines the level of detail in the image?
What is the parameter made up of phase encoding and frequency encoding and determines the level of detail in the image?
Flashcards
In and out-of-phase imaging
In and out-of-phase imaging
Abdominal imaging technique using two datasets to identify fat-related issues.
TE (Echo Time)
TE (Echo Time)
Determines image contrast based on when data is acquired relative to RF pulses.
Saturation Bands (Sat Bands)
Saturation Bands (Sat Bands)
Used to remove unwanted signal from outside the imaging area.
Fat Saturation (Fat Sat)
Fat Saturation (Fat Sat)
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Suppression Pulses
Suppression Pulses
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Spatial pre-saturation
Spatial pre-saturation
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Chemical pre-saturation
Chemical pre-saturation
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2D Imaging
2D Imaging
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3D Imaging
3D Imaging
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Sequential Data Collection
Sequential Data Collection
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Interleaving
Interleaving
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Skipping
Skipping
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interleaving
interleaving
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Slice thickness
Slice thickness
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2D sequential imaging
2D sequential imaging
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K space
K space
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2D-volumetric data collection
2D-volumetric data collection
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3D-volumetric data collection
3D-volumetric data collection
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Study Notes
- In and out-of-phase imaging is used in abdominal imaging to identify fat-related pathology.
- Two sets of data are acquired, one where fat and water are in phase and one where they're out of phase.
- The TE determines the type of contrast obtained in the images.
- Saturation bands or sat bands are used to remove unwanted tissue from images.
- Sat bands can be used to suppress flow and reduce aliasing in images.
- Fat saturation or fat sat is used to suppress fat in images.
- Fat sat can be difficult to target in non-uniform isocenters or with high susceptibility tissues.
- The use of sat bands and fat sat can increase scan time and patient heating due to increased RF pulses.
- Suppression pulses can be chemical or spatial pre-saturation pulses.
- Sat bands are placed in areas where unwanted tissue needs to be removed, while fat sat is used to suppress fat in images.
- The text discusses different techniques for removing unwanted signals from MRI images.
- One technique is using spatial pre-saturation, where RF pulses are delivered at the frequency of the unwanted signal to excite and then remove it from the image.
- Another technique is using chemical pre-saturation, also known as fat saturation, to remove fat signals from the image.
- The text also discusses 2D and 3D imaging techniques and their respective benefits and disadvantages.
- 2D imaging is faster and can achieve high in-plane resolution, while 3D imaging has higher signal-to-noise and post-reconstruction options.
- Sequential data collection and interleaving are two ways to acquire data for 2D and 3D imaging.
- Sequential data collection can lead to cross-excitation between slices, so a gap is added between slices.
- Interleaving involves collecting data from non-adjacent slices, which can reduce cross-excitation.
- 3D volumetric data collection can be done using different techniques, such as Cartesian, radial, or spiral.
- The choice of imaging technique depends on the desired outcome and the characteristics of the patient and the imaging equipment.
- Skipping a slice in MRI imaging can prevent cross-excitation artifacts.
- Each slice in MRI imaging is typically 3 millimeters thick.
- There are different techniques for collecting MRI data, including 2D sequential imaging.
- In 2D sequential imaging, each slice has its own k space and data is collected in sequential order.
- Interleaving can be used to fill slices in 2D sequential imaging.
- Echoes must be placed within each k space to meet phase encoding direction limits.
- 2D-volumetric data collection involves filling multiple slices at once.
- 3D-volumetric data collection involves filling an entire volume at once.
- The choice of MRI data collection technique can impact image quality and scan time.
- Understanding the different options for MRI data collection is important for optimizing imaging results.
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