Opt., 25 (8), pp. Am., 141 (3), pp. In: J. Biomed. If someone were to throw a stone in a pond, and you and some friends, standing at several places around the pond, recorded how long it took the ripples to reach the edge of the pond, you would, together, be able to triangulate where the stone hit the pond. 4324–4336, 2012. Med. Measurements of acoustic pressure are made with calibrated hydrophones. Am., 136 (4), pp. For example, in the last few years, clinical trials have demonstrated the ability of ultrasound to destroy cells through rapid heating for the treatment of cancer and neurological disorders, target the delivery of anticancer drugs, stimulate or modulate the excitability of neurons, and temporarily open the blood-brain barrier to allow drugs to be delivered more effectively. B. E. Treeby, B. T. Cox, E. Z. Zhang, S. K. Patch, P. C. Beard, Measurement of broadband temperature-dependent ultrasonic attenuation and dispersion using photoacoustics Journal Article. In: Acoustics Today, 15 (2), pp. Advanced photoacoustic image reconstruction using the k-Wave toolbox Conference. Am. Soc. SPIE, Photons Plus Ultrasound: Imaging and Sensing, 9708 , 2016. These ultrasound bioeffects offer enormous potential to develop new ways to treat major diseases. Cookies are used by this site. Biol., 37 (2), pp. Comput. Artifact trapping during time reversal photoacoustic imaging for acoustically heterogeneous media Journal Article. In: Applied Optics, 50 (19), pp. In: J. Acoust. 041009, 2016. Browse Hierarchy MPHY0018: MPHY0018: Ultrasound in Medicine. A monitor function for spectral moving mesh methods applied to nonlinear acoustics Conference. Opt., 20 (12), pp. This source pressure is used to define the source in k-Wave, and amplitude scaling is applied to match the drive level used in validation experiments. 244101, 2017. M. D. Brown, E. Z. Zhang, B. E. Treeby, P. C. Beard, B. T. Cox, Reverberant cavity photoacoustic imaging Journal Article, B. E. Treeby, J. Jaros, E. Martin, B. T. Cox, From biology to bytes: Predicting the path of ultrasound waves through the human body Journal Article. WC1E 6BT. For a year while writing up my PhD (on geoacoustic inversion in shallow water) I sang with the choir at Lichfield Cathedral. M. M. Betcke, B. T. Cox, N. Huynh, E. Z. Zhang, P. C. Beard, S. R. Arridge, Acoustic Wave Field Reconstruction From Compressed Measurements With Application in Photoacoustic Tomography Journal Article. The 2nd International Workshop on Medical Ultrasound Tomography (MUST 2019). These treatments are all completely non-invasive and have the potential to significantly improve outcomes for patients. 1499-1510, 2014. In: IEEE Trans. Med. Similarly, measurements of linear fields after propagation through 3D printed anatomical skull bone mimicking phantoms (see Figure 2) agreed well with simulations. 289–300, 2011. In: Commun. Med. Repeatability and Reproducibility of Hydrophone Measurements 056016, 2012. 4950-4973, 2016. Am., 144 (4), pp. In: J. Biomed. 1382-1393, 2018. Cox BT, Treeby BE (2010) Effect of sensor directionality on photoacoustic imaging: a study using the k-wave toolbox, Proc. The use of ultrasound as a diagnostic imaging tool is well known, particularly during pregnancy where ultrasound is used to create pictures of the developing babies. Imaging, 29 (2), pp. N. Huynh, F. Lucka, E. Z. Zhang, M. M. Betcke, S. R. Arridge, P. C. Beard, B. T. Cox, Single-pixel camera photoacoustic tomography Journal Article. In: J. Acoust. In: IEEE Trans. In: J. Biomed. In: Phys. To send an email to Ben Cox please complete the short form below. In: IEEE Trans. Phys. Toward accurate quantitative photoacoustic imaging: learning vascular blood oxygen saturation in three dimensions Journal Article. In the UCL Biomedical Ultrasound Group, our focus is less on conventional ultrasound imaging than on two other exciting medical imaging modalities that use ultrasound: photoacoustic tomography and ultrasound computed tomography. Ferroelectr. 036015, 2015. In: IEEE Trans. 8908–8940, 2016. 125007, 2017. The disadvantages are that the image contrast (the echogenicity) can be weak for some important targets such as small blood vessels, the images are usually just a 2D slice through the tissue, and the echogenicity cannot be easily related to more basic quantities such as bulk modulus or optical absorption (which is directly linked to the chemical differences between the different constituents of the tissue). Photoacoustic imaging, particularly inverse problems including quantitative photoacoustic imaging (and therefore light transport in tissue), Wave modelling using spectral and k-space methods (, Other areas of acoustics, including architectural acoustics, University College London, Gower Street, London, WC1E 6BT Tel: +44 (0) 20 7679 2000. 529-537, 2018. Design of multi-frequency acoustic kinoforms Journal Article. Uncertainties in the measured pressure can arise from various sources including positioning and other measurement conditions, fluctuations in the drive conditions and hydrophone sensitivity, and uncertainty on calibration data. E. S. Wise, B. T. Cox, J. Jaros, B. E. Treeby, Representing arbitrary acoustic source and sensor distributions in Fourier collocation methods Journal Article. However, the underlying physics is complex and the scale of the modelling problem requires extremely large amounts of computer memory. In: Appl. Soc. 2224-2253, 2018. Your can find your Research Finance Administrator at. Modeling power law absorption and dispersion for acoustic propagation using the fractional Laplacian Journal Article. Source Normalized Impact per Paper (SNIP). 3145-3154, 2011. 076007, 2018. E. Z. Zhang, B. Povazay, J. Laufer, A. Alex, B. Hofer, R. B. Pedley, C. Glittenberg, B. E. Treeby, B. T. Cox, P. C. Beard, W. Drexler, Multimodal photoacoustic and optical coherence tomography scanner using an all optical detection scheme for 3D morphological skin imaging Journal Article. profile page to: UCL Principal Supervisor,UCL Subsidiary Supervisor, Please report any queries concerning the data shown on this page IEEE International Ultrasonics Symposium, 2014. 2497-2508, 2016. This almost instantaneous pressure rise acts like a stone that has been thrown into a pond: it generates a wave – an ultrasound pulse – that travels through the tissue to the surface where it can be detected by ultrasound sensors. Ben Cox. In: J. Acoust. S. Rajagopal, T. Sainsbury, B. E. Treeby, B. T. Cox, Laser generated ultrasound sources using carbon-polymer nanocomposites for high frequency metrology Journal Article. Photoacoustic tomography with a single detector in a reverberant cavity Journal Article. Laser generated ultrasound sources using polymer nanocomposites for high frequency metrology Conference, E. S. Wise, J. L. Robertson, B. T. Cox, B. E. Treeby, Staircase-free acoustic sources for grid-based models of wave propagation Conference, D. R. Ramasawmy, E. Martin, J. 261901, 2020. T. Saratoon, T. Tarvainen, B. T. Cox, S. R. Arridge, A gradient-based method for quantitative photoacoustic tomography using the radiative transfer equation Journal Article, K. Firouzi, B. T. Cox, B. E. Treeby, N. Saffari, A first-order k-space model for elastic wave propagation in heterogeneous media Journal Article. Proc. 1426-1436, 2008. Ultra. Control, 67 (3), pp. Freq. Browse Hierarchy MPHY0018: MPHY0018: Ultrasound in Medicine. Biography. In: J. Biomed. 201-208, 2010. k-Wave: MATLAB toolbox for the simulation and reconstruction of photoacoustic wave-fields Journal Article. Because if we know where in the tissue a pressure rise occurred, we know where in the tissue there are regions of higher optical absorption. Ben’s research interests are principally numerical modelling and image reconstruction in photoacoustic imaging and biomedical ultrasound. Time domain simulation of harmonic ultrasound images and beam patterns in 3D using the k-space pseudospectral method Conference. Photoacoustic Tomography International Symposium on Nonlinear Acoustics (AIP Conference Proceedings). Your can find your Research Finance Administrator at. Estimating blood oxygenation from photoacoustic images: can a simple linear spectroscopic inversion ever work? Am., 144 (2), pp. J. L. Robertson, E. Martin, B. T. Cox, B. E. Treeby, Sensitivity of simulated transcranial ultrasound fields to acoustic medium property maps Journal Article. In: IEEE Trans. or Ivory, B. Zeqiri, B. T. Cox, B. E. Treeby, Measurement of the temperature-dependent speed of sound and change in Gruneisen parameter of tissue-mimicking materials Conference. M. D. Brown, D. I. Nikitichev, B. E. Treeby, B. T. Cox, Generating arbitrary ultrasound fields with tailored optoacoustic surface profiles Journal Article. Am., 129 (6), pp. B. T. Cox, J. Laufer, K. P. Kostli, P. C. Beard, Experimental validation of photoacoustic k-space propagation models Conference. Because optical absorption is related directly to the chemical structure of the tissue constituents, photoacoustic tomography can reveal fundamental information about what the tissue is made of, or what it contains, or how it is changing over time. Comput. In: Applied Optics, 49 (8), pp. Imag., 3 (4), pp. 2741–2748, 2010. While measurements made using the same hydrophone in the same acoustic field can be made very consistently, accurately measuring absolute pressure is challenging. 1866-1875, 2005. A map showing these pressure increases is called a photoacoustic image, and it can be a map of the whole 3D tissue volume (see Figure 4). Opt., 24 (12), pp. Send an email to Ben Cox. Dr Ben Cox UCL Department of Medical Physics and Biomedical Engineering. A clinical ultrasound image can be thought of as a map of the echogenicity of the tissue, with some tissues appearing bright and some appearing dark (see Figure 3). 387–396, 2010.
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