Fast algorithm for calculation of inhomogeneity gradient in magnetic resonance imaging data

Cheukkai Hui, Yu Xiang Zhou, Ponnada Narayana

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Purpose To develop and implement a new approach for correcting the intensity inhomogeneity in magnetic resonance imaging (MRI) data. Materials and Methods The algorithm is based on the assumption that intensity inhomogeneity in MR data is multiplicative and smoothly varying. Using a statistically stable method, the algorithm first calculates the partial derivative of the inhomogeneity gradient across the data. The algorithm then solves for the gradient field and fits it to a parametric surface. It was tested on both simulated and real human and animal MRI data. Results The algorithm is shown to restore the homogeneity in all images that were tested. On real human brain images the algorithm demonstrated superior or comparable performance relative to some of the commonly used intensity inhomogeneity correction methods such as SPM, BrainSuite, and N3. Conclusion The proposed algorithm provides an alternative method for correcting the intensity inhomogeneity in MR images. It is shown to be fast and its performance is superior or comparable to algorithms described in the published literature. Due to its generality, this algorithm is applicable to MR images of both humans and animals.

Original languageEnglish (US)
Pages (from-to)1197-1208
Number of pages12
JournalJournal of Magnetic Resonance Imaging
Issue number5
StatePublished - Nov 2010


  • MRI
  • bias field
  • intensity gradient
  • intensity inhomogeneity
  • surface-fitting

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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