Prospective registration of human head magnetic resonance images for reproducible slice positioning using localizer images. Gedat, E., Braun, J., Sack, I., & Bernarding, J. J Magn Reson Imaging, 20(4):581--587, Oct, 2004.
Prospective registration of human head magnetic resonance images for reproducible slice positioning using localizer images. [link]Paper  doi  abstract   bibtex   
To facilitate assessing brain tumor growth and progression of stroke lesions by reproducible slice positioning in human head magnetic resonance (MR) images, a method for prospective registration is proposed that adjusts the image slice position without moving the patient and with no additional scans.The gradient reference frame of follow-up examinations was adjusted to achieve the same image slice positioning relative to the patient as in the previous examination. The three-dimensional geometrical transformation parameters for the gradients were determined using two-dimensional image registration of three orthogonal localizer images. The method was developed and evaluated using a phantom with arbitrarily adjustable position. Feasibility for in vivo applications was demonstrated with brain MR imaging (MRI) of healthy volunteers.Standard retrospective registration was used for assessing the quality of the method. The accuracy of the realignment was 0.0 mm +/- 1.2 mm and -0.2 degrees +/- 0.9 degrees (mean +/- SD) in phantom experiments. In 10 examinations of volunteers, misalignments up to 49.2 mm and 21 degrees were corrected. The accuracy of the realignment after prospective registration was 0.1 mm +/- 1.5 mm and 0.2 degrees +/- 1.5 degrees.Image-based prospective registration using localizer images of the pre- and postexaminations is a robust method for reproducible slice positioning.
@article{ Gedat2004,
  author = {Gedat, Egbert and Braun, Juergen and Sack, Ingolf and Bernarding,
	Johannes},
  title = {Prospective registration of human head magnetic resonance images
	for reproducible slice positioning using localizer images.},
  journal = {J Magn Reson Imaging},
  year = {2004},
  volume = {20},
  pages = {581--587},
  number = {4},
  month = {Oct},
  abstract = {To facilitate assessing brain tumor growth and progression of stroke
	lesions by reproducible slice positioning in human head magnetic
	resonance (MR) images, a method for prospective registration is proposed
	that adjusts the image slice position without moving the patient
	and with no additional scans.The gradient reference frame of follow-up
	examinations was adjusted to achieve the same image slice positioning
	relative to the patient as in the previous examination. The three-dimensional
	geometrical transformation parameters for the gradients were determined
	using two-dimensional image registration of three orthogonal localizer
	images. The method was developed and evaluated using a phantom with
	arbitrarily adjustable position. Feasibility for in vivo applications
	was demonstrated with brain MR imaging (MRI) of healthy volunteers.Standard
	retrospective registration was used for assessing the quality of
	the method. The accuracy of the realignment was 0.0 mm +/- 1.2 mm
	and -0.2 degrees +/- 0.9 degrees (mean +/- SD) in phantom experiments.
	In 10 examinations of volunteers, misalignments up to 49.2 mm and
	21 degrees were corrected. The accuracy of the realignment after
	prospective registration was 0.1 mm +/- 1.5 mm and 0.2 degrees +/-
	1.5 degrees.Image-based prospective registration using localizer
	images of the pre- and postexaminations is a robust method for reproducible
	slice positioning.},
  doi = {10.1002/jmri.20153},
  institution = {Institutes for Medical Informatics, Charit� University Medicine Berlin,
	Germany. egbert.gedat@charite.de},
  keywords = {Brain, pathology; Humans; Image Processing, Computer-Assisted, methods;
	Magnetic Resonance Imaging; Phantoms, Imaging; Reproducibility of
	Results},
  language = {eng},
  medline-pst = {ppublish},
  owner = {Heiko},
  pmid = {15390147},
  timestamp = {2013.07.26},
  url = {http://dx.doi.org/10.1002/jmri.20153}
}
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