Dynamic tracking in interventional MRI using wavelet-encoded gradient-echo sequences

Michael Wendt, Martin Busch, G. Lenz, Jeffrey L. Duerk, Jonathan S. Lewin, Rainer Seibel, Dietrich Grönemeyer

Research output: Contribution to journalArticlepeer-review

Abstract

This work describes a newly developed magnetic resonance imaging (MRI) data-acquisition strategy which replaces the standard Fourier phase-encoding with the spatially localized coefficients of wavelet-encoding and offers a new technique for image guidance when combined with a dynamic tracking algorithm. By using this new technique, only a specific fraction of the entire raw data set needs to be updated and reconstructed to visualize the movement of an interventional device during an MR guided procedure. The combination of wavelet-encoding and a dynamic tracking algorithm was implemented in twodimensional and three-dimensional gradient-echo sequences on a 0.2-T open C-arm-shaped MR system (Siemens, Erlangen Germany) and tested in phantom and in vitro experiments. When applying the wavelet-encoding direction parallel to the movement of a straight interventional device, only those spatially localized wavelet-coefficients mainly affected by the interventional device are updated. This led to potential increases of the image frame rate by a factor of up to seven.

Original languageEnglish (US)
Pages (from-to)803-809
Number of pages7
JournalIEEE transactions on medical imaging
Volume17
Issue number5
DOIs
StatePublished - 1998

Keywords

  • Fast magnetic resonance imaging (MRI)
  • Interventional MRI
  • Tip-tracking
  • Wavelet-encoding

ASJC Scopus subject areas

  • Software
  • Radiological and Ultrasound Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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