Convolution kernel design and efficient algorithm for sampling density correction

Kenneth O. Johnson, James G. Pipe

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Sampling density compensation is an important step in non- cartesian image reconstruction. One of the common techniques to determine weights that compensate for differences in sampling density involves a convolution. A new convolution kernel is designed for sampling density attempting to minimize the error in a fully reconstructed image. The resulting weights obtained using this new kernel are compared with various previous methods, showing a reduction in reconstruction error. A computationally efficient algorithm is also presented that facilitates the calculation of the convolution of finite kernels. Both the kernel and the algorithm are extended to 3D.

Original languageEnglish (US)
Pages (from-to)439-447
Number of pages9
JournalMagnetic Resonance in Medicine
Volume61
Issue number2
DOIs
StatePublished - Feb 1 2009

Keywords

  • Gridding
  • Non-cartesian
  • Psf weighting
  • Sampling density

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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