Imaging from coupled physics

Arridge, Simon; Scherzer, Otmar

doi:10.1088/0266-5611/28/8/080201

Cited by 30 publications

(42 citation statements)

References 9 publications

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“…Photoacoustic imaging (PAI) is among the most prominent coupled-physics techniques [3]. It operates with laser excitation and records acoustic pressure, as the coupled modality.…”

Section: Photoacoustic Imagingmentioning

confidence: 99%

Texture Generation for Photoacoustic Elastography

2015

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Elastographic imaging is a widely used technique which can in principle be implemented on top of every imaging modality. In elastography, the specimen is exposed to a force causing local displacements in the probe, and imaging is performed before and during the displacement experiment. From the computed displacements material parameters can be deduced, which in turn can be used for clinical diagnosis. Photoacoustic imaging is an emerging image modality, which exhibits functional and morphological contrast. However, opposed to ultrasound imaging, for instance, it is considered a modality which is not suited for elastography, because it does not reveal speckle patterns. However, this is somehow counter-intuitive, because photoacoustic imaging makes available the whole frequency spectrum as opposed to single frequency standard ultrasound imaging. In this work, we show that in fact artificial speckle patterns can be introduced by using only a band-limited part of the measurement data. We also show that after introduction of artificial speckle patterns, deformation estimation can be implemented more reliably in photoacoustic imaging.

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“…Photoacoustic imaging (PAI) is among the most prominent coupled-physics techniques [3]. It operates with laser excitation and records acoustic pressure, as the coupled modality.…”

Section: Photoacoustic Imagingmentioning

confidence: 99%

Texture Generation for Photoacoustic Elastography

2015

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“…In particular, its wavelength dependence provides spectroscopic (chemical) information on the absorbing molecules (chromophores). Photoacoustic Tomography (PAT ) is an "Imaging from Coupled Physics"-technique [3] that employs laser-generated ultrasound (US) to obtain optical absorption images with the high spatial resolution of US. For recent reviews on the physical principles, technical realizations and (pre-)clinical applications of PAT, we refer the reader to [63,4,48,66].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Compressed Sensing 4D Photoacoustic Tomography by Simultaneous Motion Estimation

Lucka¹,

Huynh²,

Betcke³

et al. 2018

SIAM J. Imaging Sci.

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A crucial limitation of current high-resolution 3D photoacoustic tomography (PAT) devices that employ sequential scanning is their long acquisition time. In previous work, we demonstrated how to use compressed sensing techniques to improve upon this: images with good spatial resolution and contrast can be obtained from suitably sub-sampled PAT data acquired by novel acoustic scanning systems if sparsity-constrained image reconstruction techniques such as total variation regularization are used. Now, we show how a further increase of image quality can be achieved for imaging dynamic processes in living tissue (4D PAT). The key idea is to exploit the additional temporal redundancy of the data by coupling the previously used spatial image reconstruction models with sparsity-constrained motion estimation models. While simulated data from a two-dimensional numerical phantom will be used to illustrate the main properties of this recently developed jointimage-reconstruction-and-motion-estimation framework, measured data from a dynamic experimental phantom will also be used to demonstrate its potential for challenging, large-scale, real-world, three-dimensional scenarios. The latter only becomes feasible if a carefully designed combination of tailored optimization schemes is employed, which we describe and examine in more detail.

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“…PAT visualizes the capability of a medium to transform optical (infrared) waves into ultrasound waves to be measured on the surface of the medium [17,28,30]. PAT is called coupled physics imaging technique since it combines two kind of waves [1]. As stand alone imaging techniques PAT and OCT are not capable of recovering all diagnostically relevant physical parameters, but only some combinations of them, see [3] for PAT and [12] for OCT.…”

Section: Introductionmentioning

confidence: 99%