Correlation Analysis for Angular Compounding in Strain Imaging
Min Rao,Tomy Varghese +1 more
TL;DR: A theoretical analysis of the correlation between pre- and postcompression radio-frequency echo signals acquired from the same location but at different beam insonification angles helps in finding optimum compounding schemes for elastography.
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Abstract: Spatial angular compounding for elastography is a new technique that enables the reduction of noise artifacts in elastograms. This technique is most effective when the angular strain estimates to be averaged or compounded are uncorrelated. In this paper, we present a theoretical analysis of the correlation between pre- and postcompression radio-frequency echo signals acquired from the same location but at different beam insonification angles. The accuracy of the theoretical results is verified using radio- frequency pre- and postcompression echo signals acquired using a real-time clinical scanner on tissue-mimicking uniformly elastic and homogenous phantoms. The theory predicts an increased signal decorrelation with an increase in the beam-steered insoniflcation angle as the applied strain increases and for increasing depths in the medium. Theoretical results provide useful information regarding the correlation of the angular strain estimates obtained from different beam angles that helps in finding optimum compounding schemes for elastography.
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Citations
Estimation of the Optimal Maximum Beam Angle and Angular Increment for Normal and Shear Strain Estimation
Min Rao,Tomy Varghese +1 more
TL;DR: This paper presents error propagation analysis using the least-square fitting process for the optimization of the angular increment and the maximum beam steered angle in ultrasound elastography.
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2-D FFT for Periodic Noise Removal on Strain Image & &
Jing Wang,Dong C. Liu +1 more
- 18 Jun 2010
TL;DR: This paper presents a 2-D FFT removal algorithm for reducing such artifacts in ultrasonic strain imaging and demonstrates that the proposed method performs quite well in removing strain image artifacts.
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Noise reduction for ultrasonic elastography using transmit-side frequency compounding: a preliminary study
Shaoguo Cui,Dong C Liu +1 more
TL;DR: Simulation results based on an uniformly elastic tissue model demonstrate the decorrelation among sub-elastograms and the improvement in elastographic signal-to-noise ratio (SNRe) achieved by compounding sub-Elastograms.
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Normal and shear strain imaging using 2D deformation tracking on beam steered linear array datasets
Haiyan Xu,Tomy Varghese +1 more
TL;DR: Parallelogram shaped two-dimensional deformation tracking is demonstrated in beam-steered radiofrequency data, enabling its use in the estimation of normal and shear strain components.
Spatial Angular Compounding of Photoacoustic Images
TL;DR: Three spatial-angular compounding methods implemented by combining multiple images acquired as an ultrasound probe was rotated about the elevational axis with the laser beam and target fixed have promising potential to enhance image quality in multiple photoacoustic applications.
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References
Optimum displacement for compound image generation in medical ultrasound
TL;DR: The optimum aperture displacement for efficient incoherent averaging (i.e. compounding) is computed and found to equal approximately one-half the aperture length.
148
Normal and shear strain estimation using beam steering on linear-array transducers
Min Rao,Quan Chen,Hairong Shi,Tomy Varghese,Ernest L. Madsen,James A. Zagzebski,Thaddeus Wilson +6 more
TL;DR: Initial results using beam steering on a linear array transducer attached to a commercial scanner to acquire echo signals for estimating 2-D displacement vectors are presented and features on shear strain images generated for the inclusion phantom agree with those predicted using FEA analysis.
63
Noise reduction using spatial-angular compounding for elastography
TL;DR: A new approach is described that enables the reduction of noise artifacts in elastography without a significant reduction in either the contrast or spatial resolution.
Improvements in elastographic contrast-to-noise ratio using spatial-angular compounding.
TL;DR: The experimental results provide guidelines for the practical range of maximum insonification angles and estimates of the optimum angular increment and demonstrate the improved visual characteristics of the compound elastogram.
Spatial-angular compounding for elastography using beam steering on linear array transducers
TL;DR: Quantitative experimental results demonstrate that spatial angular compounding for elastography provides significant improvement in both the elastographic signal-to-noise ratio and the contrast- to-Noise ratio.