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Proceedings Paper

Novel spatiotemporal voxel interpolation with multibeat fusion for 3D echocardiography with irregular data distribution
Author(s): Johan G. Bosch; Marijn van Stralen; Marco M. Voormolen; Boudewijn J. Krenning; Charles T. Lancée; Johan H. C. Reiber; Anton F. W. van der Steen; Nico de Jong
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Paper Abstract

We developed a novel multi-beat image fusion technique using a special spatiotemporal interpolation for sparse, irregularly sampled data (ISI). It is applied to irregularly distributed 3D cardiac ultrasound data acquired with a fast rotating ultrasound (FRU) transducer. ISI is based on Normalized Convolution with Gaussian kernels tuned to irregular beam data spacing over cardiac phase (τ), and beam rotation (θ) and elevation angles (φ). Methods: images are acquired with the FRU transducer developed in our laboratory, a linear phased array rotating mechanically continuously at very high speed (240-480rpm). High-quality 2D images are acquired at ~100 frames/s over 5-10 seconds. ECG is recorded simultaneously. Images are irregularly distributed over τ and θ, because rotation is not synchronized to heartrate. ISI was compared quantitatively to spatiotemporal nearest neighbor interpolation (STNI) on synthetic (distance function) data of a pulsating ellipsoid for 32 angles (θ) and 37 phases (τ). ISI was also tested qualitatively on 20 in-vivo cardiac image sets and compared to classical temporal binning with trilinear voxel interpolation, at resolutions of 256*256*400 for 16 phases. Results: From the synthetic data simulations, ISI showed absolute distance errors (mean±SD) of 1.23 ± 1.52mm; considerably lower than for STNI (3.45 ± 3.03mm). For in-vivo images, ISI voxel sets showed reduced motion artifacts, suppression of noise and interpolation artifacts and better delineation of endocardium. Conclusions: ISI improves the quality of 3D+T images acquired with a fast rotating transducer in simulated and in-vivo data. It may also be useful for similar spatiotemporal irregularly distributed data, e.g. freehand 3D echocardiography.

Paper Details

Date Published: 16 March 2006
PDF: 11 pages
Proc. SPIE 6147, Medical Imaging 2006: Ultrasonic Imaging and Signal Processing, 61470Q (16 March 2006); doi: 10.1117/12.652565
Show Author Affiliations
Johan G. Bosch, Erasmus Medical Ctr. (Netherlands)
Marijn van Stralen, Erasmus Medical Ctr (Netherlands)
Interuniv. Cardiology Institute of the Netherlands (Netherlands)
Leiden Univ. Medical Ctr. (Netherlands)
Marco M. Voormolen, Erasmus Medical Ctr. (Netherlands)
Interuniv. Cardiology Institute of the Netherlands (Netherlands)
Boudewijn J. Krenning, Erasmus Medical Ctr. (Netherlands)
Charles T. Lancée, Erasmus Medical Ctr. (Netherlands)
Johan H. C. Reiber, Leiden Univ. Medical Ctr. (Netherlands)
Anton F. W. van der Steen, Erasmus Medical Ctr. (Netherlands)
Interuniv. Cardiology Institute of the Netherlands (Netherlands)
Nico de Jong, Erasmus Medical Ctr. (Netherlands)
Interuniv. Cardiology Institute of the Netherlands (Netherlands)
Univ. of Twente (Netherlands)


Published in SPIE Proceedings Vol. 6147:
Medical Imaging 2006: Ultrasonic Imaging and Signal Processing
Stanislav Emelianov; William F. Walker, Editor(s)

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