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Parameter distribution models for estimation of population based left ventricular deformation using sparse fiducial
Espen W Remme1, Kevin F Augenstein, Alistair A Young
1Institute for Surgical Research, Rikshospitalet University Hospital, 0027 Oslo, Norway. espen.remme@medisin.uio.no
IEEE Transactions on Medical Imaging
|March 10, 2005
Summary
This study introduces a novel method for estimating left ventricular (LV) motion using 3-D imaging and fiducial markers. The technique accurately reconstructs LV deformation in normal subjects, validated against MR tagging.
Area of Science:
- Cardiovascular Imaging
- Biomedical Engineering
- Medical Physics
Background:
- Accurate assessment of left ventricular (LV) motion is crucial for diagnosing cardiac conditions.
- Existing methods for quantifying LV deformation may have limitations in accuracy or applicability across different imaging modalities.
Purpose of the Study:
- To develop and validate a novel method for estimating left ventricular (LV) motion and deformation using 3-D imaging.
- To assess the accuracy of the proposed method by comparing its results with established techniques like MR tagging.
Main Methods:
- A finite element mesh of the LV was created and deformed using nodal parameters optimized to manually tracked fiducial markers in 3-D images.
- A parameter distribution model (PDM) of LV deformations, derived from MR tagging studies, was employed to filter and refine the estimated deformation.
- The method was applied to 13 normal, untagged cardiac studies and the results were compared to those obtained from MR tagging.
Main Results:
- The estimated end-systolic (ES) circumferential and longitudinal strain values showed good agreement with MR tagging, with mean differences of 0.1 +/- 3.2% and 0.3 +/- 3.0%, respectively.
- The calculated apex-base twist angle at ES also demonstrated high accuracy, with a mean difference of 1.0 +/- 2.3 degrees compared to MR tagging.
- The method successfully reconstructed LV deformation in normal subjects, indicating its potential for clinical application.
Conclusions:
- Fiducial marker fitting combined with a parameter distribution model (PDM) enables accurate reconstruction of left ventricular (LV) deformation.
- This method offers a robust approach for quantifying LV motion and deformation across various 3-D imaging modalities.
- The findings suggest this technique can reliably assess cardiac mechanics in normal individuals, paving the way for its use in disease states.