keyword
MENU ▼
Read by QxMD icon Read
search

Ultrasound phantom

keyword
https://www.readbyqxmd.com/read/28211622/mri-guided-focused-ultrasound-robotic-system-for-animal-experiments
#1
Marinos Yiannakou, Georgios Menikou, Christos Yiallouras, Cleanthis Ioannides, Christakis Damianou
BACKGROUND: In this paper an MRI-guided focused ultrasound (MRgFUS) robotic system was developed that can be used for conducting experiments in small animals.The target for this robotic system regarding motion was to move a therapeutic ultrasound transducer in two Cartesian axes. METHODS: A single element spherically focused transducer of 3 cm diameter, focusing at 7 cm and operating at 0.4 MHz was used. The positioning device incorporates only MRI compatible materials...
February 17, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28211003/an-easy-to-build-low-budget-point-of-care-ultrasound-simulator-from-linux-to-a-web-based-solution
#2
Domagoj Damjanovic, Ulrich Goebel, Benedikt Fischer, Martin Huth, Hartmut Breger, Hartmut Buerkle, Axel Schmutz
BACKGROUND: Hands-on training in point-of-care ultrasound (POC-US) should ideally comprise bedside teaching, as well as simulated clinical scenarios. High-fidelity phantoms and portable ultrasound simulation systems are commercially available, however, at considerable costs. This limits their suitability for medical schools. A Linux-based software for Emergency Department Ultrasound Simulation (edus2TM) was developed by Kulyk and Olszynski in 2011. Its feasibility for POC-US education has been well-documented, and shows good acceptance...
December 2017: Critical Ultrasound Journal
https://www.readbyqxmd.com/read/28210824/ultrasound-palpation-for-fast-in-situ-quantification-of-articular-cartilage-stiffness-thickness-and-relaxation-capacity
#3
M Schöne, R M Schulz, H Tzschätzsch, P Varga, K Raum
Most current cartilage testing devices require the preparation of excised samples and therefore do not allow intra-operative application for diagnostic purposes. The gold standard during open or arthroscopic surgery is still the subjective perception of manual palpation. This work presents a new diagnostic method of ultrasound palpation (USP) to acquire applied stress and strain data during manual palpation of articular cartilage. With the proposed method, we obtain cartilage thickness and stiffness. Moreover, repeated palpations allow the quantification of relaxation effects...
February 16, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28190986/algorithms-for-automatically-pointing-ultrasound-imaging-catheters
#4
Paul M Loschak, Laura J Brattain, Robert D Howe
A system for automatically pointing ultrasound (US) imaging catheters will enable clinicians to monitor anatomical structures and track instruments during interventional procedures. Off-the-shelf US catheters provide high quality US images from within the patient. While this method of imaging has been proven to be effective for guiding many interventional treatments, significant training is required to overcome the difficulty in manually steering the imager to point at desired structures. Our system uses closed-form four degree of freedom (DOF) kinematic solutions to automatically position the US catheter and point the imager...
February 2017: IEEE Transactions on Robotics: a Publication of the IEEE Robotics and Automation Society
https://www.readbyqxmd.com/read/28186887/accelerated-singular-value-based-ultrasound-blood-flow-clutter-filtering-with-randomized-singular-value-decomposition-rsvd-and-randomized-spatial-downsampling
#5
Pengfei Song, Joshua Trzasko, Armando Manduca, Bo Qiang, Ramanathan Kadirvel, David Kallmes, Shigao Chen
Singular value decomposition (SVD)-based ultrasound blood flow clutter filters have recently demonstrated substantial improvement in clutter rejection for ultrafast plane wave microvessel imaging, and have become the commonly used clutter filtering method for many novel ultrafast imaging applications such as functional ultrasound and super-resolution imaging. At present, however, the computational burden of SVD remains as a major hurdle for practical implementation and clinical translation of this method. To address this challenge, in the study we present two blood flow clutter filtering methods based on randomized singular value decomposition (rSVD) and randomized spatial downsampling to accelerate SVD clutter filtering with minimal compromise to the clutter filter performance...
February 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28168822/circumferential-strain-by-velocity-vector-imaging-and-speckle-tracking-echocardiography-validation-against-sonomicrometry-in-an-aortic-phantom
#6
Johan Petrini, Maria J Eriksson, Kenneth Caidahl, Matilda Larsson
BACKGROUND: Evaluation of arterial deformation and mechanics using strain analysis on ultrasound greyscale images has gained increasing scientific interest. The aim of this study was to validate in vitro measurements of circumferential strain by velocity vector imaging (VVI) and speckle-tracking echocardiography (STE) against sonomicrometry as a reference method. METHOD: Two polyvinyl alcohol phantoms sized to mimic the descending aorta were constructed and connected to a pulsatile flow pump to obtain high-resistance flow profiles...
February 6, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28167319/uniform-tissue-lesion-formation-induced-by-high-intensity-focused-ultrasound-along-a-spiral-pathway
#7
Kui Qian, Chenghai Li, Zhengyang Ni, Juan Tu, Xiasheng Guo, Dong Zhang
Both theoretical and experimental studies were performed here to investigate the lesion formation induced by high-intensity focused ultrasound (HIFU) operating in continuous scanning mode along a spiral pathway. The Khokhlov-Zabolotskaya-Kuznetsov equation and bio-heat equation were combined in the current model to predict HIFU-induced temperature distribution and lesion formation. The shape of lesion and treatment efficiency were assessed for a given scanning speed at two different grid spacing (3mm and 4mm) in the gel phantom studies and further researched in ex vivo studies...
January 24, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28166493/a-gpu-accelerated-3d-coupled-sub-sample-estimation-algorithm-for-volumetric-breast-strain-elastography
#8
Bo Peng, Yuqi Wang, Timothy J Hall, Jingfeng Jiang
Our primary objective of this work was to extend a previously published 2D coupled sub-sample tracking algorithm for 3D speckle tracking in the framework of ultrasound breast strain elastography. In order to overcome heavy computational cost, we investigated the use of a graphic processing unit (GPU) to accelerate the 3D coupled sub-sample speckle tracking method. The performance of the proposed GPU implementation was tested using a tissue-mimicking (TM) phantom and in vivo breast ultrasound data. The performance of this 3D sub-sample tracking algorithm was compared with the conventional 3D quadratic subsample estimation algorithm...
January 31, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28166491/photoacoustic-ultrasound-tomography-with-s-sequence-aperture-encoding
#9
Quinn Barber, Roger J Zemp
A combined photoacoustic-ultrasound (PAUS) tomography system is introduced using a ring-array and novel aperture encoding schemes. The ultrasound sub-system is able to achieve diffraction limited half-wavelength isotropic in-plane spatial resolution unlike previous systems. S-sequence aperture encoding improves signal-to-noise ratio for the ultrasound tomography sub-system. We measured an average resolution of 139 44m for S-Sequence ultrasound tomography, and a resolution of 180 32m for photoacoustic tomography...
January 30, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28166189/evaluation-of-three-dimensional-printed-materials-for-simulation-by-computed-tomography-and-ultrasound-imaging
#10
James J Mooney, Nabeel Sarwani, Melissa L Coleman, Joseph S Fotos
INTRODUCTION: The use of three-dimensional (3D) printing allows for creation of custom models for clinical care, education, and simulation. Medical imaging, given the significant role it plays in both clinical diagnostics and procedures, remains an important area for such education and simulation. Unfortunately, the materials appropriate for use in simulation involving radiographic or ultrasound imaging remains poorly understood. Therefore, our study was intended to explore the characteristics of readily available 3D printing materials when visualized by computed tomography (CT) and ultrasound...
February 4, 2017: Simulation in Healthcare: Journal of the Society for Simulation in Healthcare
https://www.readbyqxmd.com/read/28165578/a-randomized-study-of-training-with-large-versus-small-vessel-size-on-successful-ultrasound-guided-peripheral-venous-access
#11
Joshua Davis, Timothy Faust, Azeem Tajani, Amanda Bates, Jenna Jarriel, Arthur Au, Jason Matthew Fields
PURPOSE: Our objective was to investigate whether training on phantoms with smaller or larger vessels would improve success rate in novice medical students learning this skill. METHODS: Medical students who participated in a voluntary, extracurricular ultrasound training day were asked to participate in the study as part of their procedural training. They were given a standardized education and demonstration of how to use ultrasound to place a peripheral intravenous (IV) catheter...
January 31, 2017: Journal of Vascular Access
https://www.readbyqxmd.com/read/28165390/a-dual-modality-system-for-both-multi-color-ultrasound-switchable-fluorescence-and-ultrasound-imaging
#12
Jayanth Kandukuri, Shuai Yu, Bingbing Cheng, Venugopal Bandi, Francis D'Souza, Kytai T Nguyen, Yi Hong, Baohong Yuan
Simultaneous imaging of multiple targets (SIMT) in opaque biological tissues is an important goal for molecular imaging in the future. Multi-color fluorescence imaging in deep tissues is a promising technology to reach this goal. In this work, we developed a dual-modality imaging system by combining our recently developed ultrasound-switchable fluorescence (USF) imaging technology with the conventional ultrasound (US) B-mode imaging. This dual-modality system can simultaneously image tissue acoustic structure information and multi-color fluorophores in centimeter-deep tissue with comparable spatial resolutions...
February 4, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28165334/sensitivity-of-simulated-transcranial-ultrasound-fields-to-acoustic-medium-property-maps
#13
James L B Robertson, Eleanor Martin, Ben Cox, Bradley Treeby
High intensity transcranial focused ultrasound is an FDA approved treatment for essential tremor, while low-intensity applications such as neurostimulation and opening the blood brain barrier are under active research. Simulations of transcranial ultrasound propagation are used both for focusing through the skull, and predicting intracranial fields. Maps of the skull acoustic properties are necessary for accurate simulations, and can be derived from medical images using a variety of methods. The skull maps range from segmented, homogeneous models, to fully heterogeneous models derived from medical image intensity...
February 6, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28159770/ultrasonic-mirror-image-from-ruthenium-plaque-facilitates-calculation-of-uveal-melanoma-treatment-dose
#14
Charlotte Alfast Espensen, Peter Koch Jensen, Lotte Stubkjær Fog, Ane Lindegaard Appelt, Kristian Klemp, Hans Callø Fledelius, Lena Specht, Jens Folke Kiilgaard
BACKGROUND/AIMS: To present a new method to determine dose depth and the distance from the concave side of the plaque to the tumour base in patients with uveal melanoma treated with ruthenium-106 based on ultrasonic mirror image. METHODS: We used the mirror image associated with ultrasound during plaque brachytherapy to determine intraobserver reproducibility and interobserver agreement between two surgeons. 230 eyes with primary uveal melanoma were included in a retrospective analysis to determine the distance from the plaque to the tumour base using ultrasound...
February 3, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28157909/experimental-evaluation-of-the-resolution-and-quantitative-accuracy-of-temperature-modulated-fluorescence-tomography
#15
Tiffany C Kwong, Farouk Nouizi, Yuting Lin, Jaedu Cho, Yue Zhu, Uma Sampathkumaran, Gultekin Gulsen
Previously, we reported on the spatial resolution and quantitative accuracy of temperature-modulated fluorescence tomography (TM-FT) using simulation studies. TM-FT is a novel fully integrated multimodality imaging technique that combines fluorescence diffuse optical tomography (FT) with focused ultrasound. Utilizing unique thermo-reversible fluorescent nanocapsules (ThermoDots), TM-FT provides high-resolution cross-sectional fluorescence images in thick tissue (up to 6 cm). Focused ultrasound and temperature-sensitive ThermoDots are combined to provide accurate localization of these fluorescent probes and functional a priori information to constrain the conventional FT reconstruction algorithm...
January 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28151726/2-d-multi-frequency-imaging-of-a-tumor-inclusion-in-homogeneous-breast-phantom-using-harmonic-motion-doppler-imaging-method
#16
Azadeh Kamali Tafreshi, Can Top, Nevzat Gencer
Harmonic Motion Microwave Doppler Imaging (HMMDI) is a novel imaging modality to image the coupled electrical and mechanical properties of body tissues. In this paper, we used two experimental systems with different receiver configurations to obtain HMMDI images from tissue mimicking phantoms at multiple vibration frequencies between 15 Hz and 35 Hz. In the first system, we used a spectrum analyzer to obtain the Doppler data in frequency domain, while in the second one, we used a homodyne receiver that was designed to acquire time domain data...
February 2, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28149518/why-we-should-care-about-soft-tissue-interfaces-when-applying-ultrasonic-diathermy-an-experimental-and-computer-simulation-study
#17
Thaís Pionório Omena, Aldo José Fontes-Pereira, Rejane Medeiros Costa, Ricardo Jorge Simões, Marco Antônio von Krüger, Wagner Coelho de Albuquerque Pereira
BACKGROUND: One goal of therapeutic ultrasound is enabling heat generation in tissue. Ultrasound application protocols typically neglect these processes of absorption and backscatter/reflection at the skin/fat, fat/muscle, and muscle/bone interfaces. The aim of this study was to investigate the heating process at interfaces close to the transducer and the bone with the aid of computer simulation and tissue-mimicking materials (phantoms). METHODS: The experimental setup consists of physiotherapeutic ultrasound equipment for irradiation, two layers of soft tissue-mimicking material, and one with and one without an additional layer of bone-mimicking material...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/28148767/ultrasound-imaging-velocimetry-with-interleaved-images-for-improved-pulsatile-arterial-flow-measurements-a-new-correction-method-experimental-and-in-vivo-validation
#18
Katharine H Fraser, Christian Poelma, Bin Zhou, Eleni Bazigou, Meng-Xing Tang, Peter D Weinberg
Blood velocity measurements are important in physiological science and clinical diagnosis. Doppler ultrasound is the most commonly used method but can only measure one velocity component. Ultrasound imaging velocimetry (UIV) is a promising technique capable of measuring two velocity components; however, there is a limit on the maximum velocity that can be measured with conventional hardware which results from the way images are acquired by sweeping the ultrasound beam across the field of view. Interleaved UIV is an extension of UIV in which two image frames are acquired concurrently, allowing the effective interframe separation time to be reduced and therefore increasing the maximum velocity that can be measured...
February 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28146496/ultrasonic-detection-based-on-polarization-dependent-optical-reflection
#19
Xiaoyi Zhu, Zhiyu Huang, Guohe Wang, Wenzhao Li, Da Zou, Changhui Li
Owing to their extremely wide bandwidths, pure optical ultrasonic detection methods are gaining increasing interest. In this Letter, we proposed a simple ultrasonic detector that is based on the polarization-dependent optical reflection. When the acoustic wave reaches the liquid-glass interface, the acoustic pressure changed the relative refractive index between two media, leading to perturbations in the reflectance of the optical probe beam in glass. Unlike previous studies that detected the modulations in the intensity of the reflected beam, our method, named "polarization-dependent reflection ultrasonic detection (PRUD)," detects the intensity difference between two polarization components of the same probe beam...
February 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28138404/acoustic-radiation-force-impulse-imaging-of-kidneys-a-phantom-study
#20
Szymon Cygan, Magdalena Januszewicz
AIM OF THE STUDY: Since there have been only few works reporting the diagnosis of kidneys using Acoustic Radiation Force Impulse technique and those works do not provide consistent results of shear wave velocity measurements in renal tissue, we have decided to use kidney phantoms with known properties to examine the reliability of the method itself in a controlled setup similar to kidneys examination. MATERIALS AND METHODS: Four gelatin-based phantoms imitating different clinical situations were manufactured - two with thick and two with thin renal cortex, each type at a depth similar to a normal-weight or overweight patient...
December 2016: Journal of Ultrasonography
keyword
keyword
117225
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"