Speckle Decorrelation: Observed, Explained, and Tackled

Brug, Hedser van; Somers, Peter

doi:10.1007/978-3-642-57323-1_2

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…Building the phase di erences of successive frames, and then summing or integrating the di erences has been used in phase sensitive imaging [10][11][12][13][14]. It removes the burden of phase unwrapping and thereby improves results.…”

Section: Discussionmentioning

confidence: 99%

“…We additionally used weights to specify how reliable the respective value of the cross-spectrum C U is. Unfortunately, most algorithms that were used previously to compute weights in astronomy cannot be computed as e iciently as C U , since we used a fast convolution to apply the Gaussian filter in equation (10). We therefore use the weights…”

Section: The Weightsmentioning

confidence: 99%

“…Just integrating the phase di erence of successive frames followed by a summation, as it is commonly used for phase unwrapping [10][11][12][13][14], accumulates the phase noise; except for phase unwrapping it is mathematically equivalent to a direct phase comparison. Without averaging, calculating short time phase differences will not yield any information about phase di erences of uncorrelated speckle pa erns.…”

Section: Introductionmentioning

confidence: 99%

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Phase-sensitive interferometry of decorrelated speckle patterns

Hillmann¹,

Spahr²,

Pfäffle³

et al. 2019

Preprint

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Phase-sensitive coherent imaging exploits changes in the phases of backsca ered light to observe tiny alterations of sca ering structures or variations of the refractive index. But moving sca erers or a fluctuating refractive index decorrelate the phases and speckle patterns in the images. It is generally believed that once the speckle pa ern has changed, the phases are scrambled and any meaningful phase di erence to the original pattern is removed. As a consequence, di usion and tissue motion below the resolution handicap phase-sensitive imaging of biological specimen. Here, we show that, surprisingly, a phase comparison between decorrelated speckle pa erns is still possible by utilizing a series of images acquired during decorrelation. The resulting evaluation scheme is mathematically equivalent to methods for astronomic imaging through the turbulent sky by speckle interferometry. We thus adopt the idea of speckle interferometry to phase-sensitive imaging in biological tissues and demonstrate its e icacy for simulated data and for imaging of photoreceptor activity with phase-sensitive optical coherence tomography. The described methods can be applied to any imaging modality that uses phase values for interferometry.

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Section: Discussionmentioning

confidence: 99%

Section: The Weightsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase-sensitive interferometry of decorrelated speckle patterns

Hillmann¹,

Spahr²,

Pfäffle³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

Phase-sensitive interferometry of decorrelated speckle patterns

Spahr

Pfäffle

Burhan

et al. 2019

Sci Rep

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Phase-sensitive coherent imaging exploits changes in the phases of backscattered light to observe tiny alterations of scattering structures or variations of the refractive index. But moving scatterers or a fluctuating refractive index decorrelate the phases and speckle patterns in the images. It is generally believed that once the speckle pattern has changed, the phases are scrambled and any meaningful phase difference to the original pattern is removed. As a consequence, diffusion and tissue motion that cannot be resolved, prevent phase-sensitive imaging of biological specimens. Here, we show that a phase comparison between decorrelated speckle patterns is still possible by utilizing a series of images acquired during decorrelation. The resulting evaluation scheme is mathematically equivalent to methods for astronomic imaging through the turbulent sky by speckle interferometry. We thus adopt the idea of speckle interferometry to phase-sensitive imaging in biological tissues and demonstrate its efficacy for simulated data and imaging of photoreceptor activity with phase-sensitive optical coherence tomography. We believe the described methods can be applied to many imaging modalities that use phase values for interferometry.

show abstract

Speckle Decorrelation: Observed, Explained, and Tackled

Cited by 2 publications

References 3 publications

Phase-sensitive interferometry of decorrelated speckle patterns

Phase-sensitive interferometry of decorrelated speckle patterns

Phase-sensitive interferometry of decorrelated speckle patterns

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