Searched for: subject%3A%22Photoacoustic%255C+imaging%22
(1 - 14 of 14)
document
Oza, Jimeet (author)
Atrial fibrillation is a cardiac arrhythmia resulting from abnormal electrical conduction and impulse formation within the atria. To address this condition, a minimally invasive procedure called cardiac ablation is performed. Real-time visual feedback during this procedure plays a critical role in determining its success.<br/><br/>Photoacoustic...
master thesis 2023
document
Hosseini, Fatemeh (author), Mozaffarzadeh, M. (author), Mahlooiifar, Ali (author), Verweij, M.D. (author), de Jong, N. (author)
In recent years, transcranial photoacoustic (TPA) imaging has become a popular modality for diagnosis of brain disorders. However, due to the presence of skull, TPA images are strongly degraded. Acoustically, this degradation is mainly categorized into the phase aberration, mode-converted shear waves, and multiple scattering. Previous studies...
conference paper 2022
document
Pieters, Cedric (author), Westerveld, W.J. (author), Mahmud-Ul-Hasan, Hasan (author), Severi, Simone (author), Kjellman, Jon (author), Jansen, Roelof (author), Rochus, Veronique (author), Rottenberg, Xavier (author)
Photoacoustic tomography defines new challenges for ultrasound detection compared to ultrasonography. To address these challenges, a sensitive, small, scalable, and broadband optomechanical ultrasound sensor (OMUS) has been developed. The OMUS is an on-chip optical ultrasound sensor, using optical interferometric ultrasound detection. It...
conference paper 2022
document
van Heumen, Saskia (author)
Lymphedema is the accumulation of protein-rich fluid in the intersitium (i.e., dermal backflow (DBF)), causing swelling. It is a commonly seen due to iatrogenic damage to the lymphatics after surgical and radiotherapeutic treatment of cancer. An important microsurgical treatment is lymphovenous bypass (LVB) surgery, during which a lymphatic...
master thesis 2021
document
Hakakzadeh, Soheil (author), Mozaffarzadeh, M. (author), Mostafavi, Seyed Masood (author), Amjadian, Mohammadreza (author), Kavehvash, Zahra (author), Verweij, M.D. (author), de Jong, N. (author)
In circular photoacoustic computed tomography, for data acquisition, a single-element transducer rotates around the region of interest (ROI). Due to the limited acceptance angle of the finite size transducer, the reconstructed image becomes blurred, and tangential resolution/contrast degrades in off-center locations in the ROI. In this paper, we...
conference paper 2021
document
Miri Rostami, Seyyed Reza (author), Mozaffarzadeh, M. (author), Hariri, Ali (author), Jokerst, Jesse V. (author), Ghaffari-Miab, Mohsen (author)
Double-stage delay-multiply-and-sum (DS-DMAS) is one of the algorithms proposed for photoacoustic image reconstruction where a linear-array transducer is used to detect signals. This algorithm provides a higher contrast image in comparison with the conventional delay-multiply-and-sum (DMAS) and delay-and-sum (DAS), but it imposes a high...
conference paper 2019
document
Miri Rostami, Seyyed Reza (author), Mozaffarzadeh, M. (author), Ghaffari-Miab, Mohsen (author), Hariri, Ali (author), Jokerst, Jesse (author)
Double-stage delay-multiply-and-sum (DS-DMAS) is an algorithm proposed for photoacoustic image reconstruction. The DS-DMAS algorithm offers a higher contrast than conventional delay-and-sum and delay-multiply and-sum but at the expense of higher computational complexity. Here, we utilized a compute unified device architecture (CUDA) graphics...
journal article 2019
document
Iskander-Rizk, Sophinese (author), Kruizinga, P. (author), Beurskens, Robert (author), Springeling, Geert (author), Mastik, Frits (author), de Groot, N.M.S. (author), Knops, Paul (author), van der Steen, A.F.W. (author), van Soest, Gijs (author)
In interventional electrophysiology, catheter-based radiofrequency (RF) ablation procedures restore cardiac heart rhythm by interrupting aberrant conduction paths. Real-time feedback on lesion formation and post-treatment lesion assessment could overcome procedural challenges related to ablation of underlying structures and lesion gaps. This...
journal article 2019
document
Paridar, Roya (author), Mozaffarzadeh, M. (author), Basij, Maryam (author), Mehrmohammadi, Mohammad (author), Orooji, Mahdi (author)
Delay-and-Sum (DAS), as a non-adaptive beamforming method, is one of the most common algorithms used in Photoacoustic imaging due to its simple implementation. The results obtained from this algorithm suffer from low resolution and high sidelobes. The adaptive Minimum variance (MV) method improves the image quality compared to DAS in terms of...
conference paper 2018
document
Wu, Min (author), Springeling, Geert (author), Lovrak, M. (author), Mastik, Frits (author), Iskander-Rizk, Sophinese (author), Wang, Tianshi (author), Van Beusekom, Heleen M.M. (author), van der Steen, A.F.W. (author), van Soest, G. (author)
Lipid deposition can be assessed with combined intravascular photoacoustic/ultrasound (IVPA/US) imaging. To date, the clinical translation of IVPA/US imaging has been stalled by a low imaging speed and catheter complexity. In this paper, we demonstrate imaging of lipid targets in swine coronary arteries in vivo, at a clinically useful frame...
journal article 2017
document
Lajoinie, Guillaume (author), Linnartz, Erik (author), Kruizinga, P. (author), de Jong, N. (author), Stride, Eleanor (author), Van Soest, Gijs (author), Versluis, Michel (author)
Microbubbles are used to enhance the contrast in ultrasound imaging. When coated with an optically absorbing material, these bubbles can also provide contrast in photoacoustic imaging. This multimodal aspect is of pronounced interest to the field of medical imaging. The aim of this paper is to provide a theoretical framework to describe the...
journal article 2017
document
Jansen, K. (author), Van Soest, G. (author), Van der Steen, A.F.W. (author)
The vulnerable atherosclerotic plaque is believed to be at the root of the majority of acute coronary events. Even though the exact origins of plaque vulnerability remain elusive, the thin-cap fibroatheroma, characterized by a lipid-rich necrotic core covered by a thin fibrous cap, is considered to be the most prominent type of vulnerable plaque...
journal article 2014
document
Jansen, K. (author), Van der Steen, A.F.W. (author), Wu, M. (author), Van Beusekom, H.M.M. (author), Springeling, G. (author), Li, X. (author), Zhou, Q. (author), Shung, K.K. (author), De Kleijn, D.P.V. (author), Van Soest, G. (author)
The natural history of atherosclerosis is marked by changes in the lipid biochemistry in the diseased arterial wall. As lesions become more vulnerable, different cholesterol species accumulate in the plaque. Understanding unstable atherosclerosis as a pharmacological and interventional therapeutic target requires chemically specific imaging of...
journal article 2014
document
Jansen, K. (author), Wu, M. (author), Van der Steen, A.F.W. (author), Van Soest, G. (author)
The presence of lipids in atherosclerotic coronary lesions is an important determinant of their potential to trigger acute coronary events. Spectroscopic intravascular photoacoustic imaging (sIVPA) has the potential to automatically detect lipids in atherosclerotic lesions. For realtime in vivo imaging, limiting the number of excitation...
journal article 2013
Searched for: subject%3A%22Photoacoustic%255C+imaging%22
(1 - 14 of 14)