Method for obtaining strain from radially-tagged magnetic...

Details Method for obtaining strain from radially-tagged magnetic... Method for obtaining strain from radially-tagged magnetic...

2007-06-06

2011-12-06

Casler, Brian (Department: 3737)

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

C324S309000

Reexamination Certificate

active

08073523

ABSTRACT:
The present invention relates to a system for obtaining strain corresponding to an object's deformation by radially-tagged magnetic resonance imaging (MRI). The system acquires at least a ring-shaped crown region of Fourier domain (k-space) data for at least two sequential images of a radially-tagged object at different phases of deformation of the radially-tagged object. A first image represents a primary state of the radially-tagged object and a second image represents a secondary state of the radially-tagged object. Additionally, the images include radial tag lines. The first and second images are reconstructed as a reconstructed primary-state image and a reconstructed secondary-state image. The images are reconstructed as weighted by circumferential density of the radial tag lines, such that they are “tag line density-weighted” reconstructed images. Circumferential strain of the radially-tagged object is determined by comparing the two images.

REFERENCES:
patent: 6892089 (2005-05-01), Prince et al.
patent: 2001/0031037 (2001-10-01), Prince et al.
Nicholas J. Tustison and Amir A. Amini, “Biventricular Myocardial Strains via Nonrigid Registration of AnFigatomical . . . ”, IEEE Trans on Med Imaging, 25: No. 1, 94:112 (2006).
Nael F. Osman, Smita Sampath, Ergin Atalar, and Jerry L. Prince, “Imaging Longitudinal Cardiac Strain on Short-Axis Images Using Strain-Encoded MRI”, MRM, 46:324-334 (2001).

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