Mri fbp and phase encoding
Download
1 / 23

MRI, FBP and phase encoding - PowerPoint PPT Presentation


  • 124 Views
  • Uploaded on

MRI, FBP and phase encoding. Spins. Precession. RF pulse. T1 and T2. Bloch Equations. Receiver. T1 and T2. Effect of tissue. Slice selection. Slice selection. FBP. Filtered Back Projection. Filtered B a ck Projection. Filtered Back Projection. Filtered backprojection.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'MRI, FBP and phase encoding' - tania


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript













Filtered b a ck projection
Filtered Back Projection



Mri fbp and phase encoding

Filtered backprojection

  • Filter the measured projection data at different projection

  • angles with a special function.

  • Backproject the filtered projection data to form the

  • reconstructed image.

  • Filtering can be implemented in 2 ways, in the spatial domain, the filter operation is

  • equivalent to to convolving the measured projection data using a special convolving

  • function h(t)

  • More efficient multiplication will be in the spatial frequency domain.

  • FFT the measured projection data into the frequency domain:

  • p(,)=FT {p(t, )

  • Multiply the the fourier transform projections with the special function.

  • Inverse Fourier transform the product p’(,).