Motion Estimation Applied to Reconstruct Undersampled Dynamic MRI

  • Claudia Prieto
  • Marcelo Guarini
  • Joseph Hajnal
  • Pablo Irarrazaval
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4872)

Abstract

Magnetic Resonance Imaging (MRI) has become an important tool for dynamic clinical studies. Regrettably, the long acquisition time is still a challenge in dynamic MRI. Several undersampled reconstruction techniques have been developed to speed up the acquisition without significantly compromising image quality. Most of these methods are based on modeling the pixel intensity changes. Recently, we introduced a new approach based on the motion estimation of each object element (obel, a piece of tissue). Although the method works well, the outcome is a trade off between the maximum undersampling factor and the motion estimation accuracy. In this work we propose to improve its performance through the use of additional data from multiple coils acquisition. Preliminary results on cardiac MRI show that further undersampling and/or improved reconstruction accuracy is achieved using this technique. Furthermore, an approximation of the vector field of motion is obtained. This method is appropriate for sequences where the obels’ intensity through time is nearly constant.

Keywords

motion estimation MRI dynamic images undersampling 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Claudia Prieto
    • 1
  • Marcelo Guarini
    • 1
  • Joseph Hajnal
    • 2
  • Pablo Irarrazaval
    • 1
  1. 1.Pontificia Universidad Católica de Chile, Departamento de Ingenieria Eléctrica, Vicuna Mackenna 4860, Email: pim@ing.puc.clChile
  2. 2.Hammersmith Hospital, Imperial College London, Du Cane Road W12 ONNUK

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