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Water-fat Separation in 3D Projection MRI
Image reconstruction from data acquired with 3D projection MRI is modified to obtain separate images with water and fat components, based on their differing resonance frequency.
Motivation:
In magnetic resonance imaging (MRI), water and fat resonate at slightly different frequencies. This can create image artefacts. On the other hand, the effect can be used to separate the two major components in the human body which both hold diagnostic value. In projection MRI, off-resonant signal shows a particular behaviour known as ringing and blurring. Thus, only one component can be “sharp” in the reconstructed images. Being a nuisance in the first place, this effect can be utilised to tune the image contrast. In a further step, this additional information should be used to separate water and fat.
Methods:
3D projection images are reconstructed from the same data set but with different resonance offsets. The different appearance of water and fat in the images is used to extract information about the two components, based on a suitable model.
Tasks:
• Get familiar with projection MRI, in particular the zero-echo time (ZTE) imaging technique
• Perform simulations for different situations: water and fat are a) in the same location, or b) located next to each other
• Create a model that enables separating two components with different resonance frequency
• Apply the technique to different data sets
Type of work:
Semester project (1 student): 30% Theory, 70% Software
Motivation: In magnetic resonance imaging (MRI), water and fat resonate at slightly different frequencies. This can create image artefacts. On the other hand, the effect can be used to separate the two major components in the human body which both hold diagnostic value. In projection MRI, off-resonant signal shows a particular behaviour known as ringing and blurring. Thus, only one component can be “sharp” in the reconstructed images. Being a nuisance in the first place, this effect can be utilised to tune the image contrast. In a further step, this additional information should be used to separate water and fat.
Methods: 3D projection images are reconstructed from the same data set but with different resonance offsets. The different appearance of water and fat in the images is used to extract information about the two components, based on a suitable model.
Tasks: • Get familiar with projection MRI, in particular the zero-echo time (ZTE) imaging technique • Perform simulations for different situations: water and fat are a) in the same location, or b) located next to each other • Create a model that enables separating two components with different resonance frequency • Apply the technique to different data sets
Type of work: Semester project (1 student): 30% Theory, 70% Software
Separating water and fat components in projection MRI data.
Separating water and fat components in projection MRI data.