نتایج جستجو برای: ultrasound imaging

تعداد نتایج: 544100  

Journal: :Archives of disease in childhood. Fetal and neonatal edition 2003
E H Whitby M N Paley M F Smith A Sprigg N Woodhouse P D Griffiths

BACKGROUND Magnetic resonance (MR) imaging of the neonate has been restricted by the need to transport the sick baby to the large magnetic resonance scanners and often the need for sedation or anaesthesia in order to obtain good quality images. Ultrasound is the reference standard for neonatal imaging. OBJECTIVE To establish a dedicated neonatal MR system and compare the clinical usefulness o...

Journal: :Journal of biomedical optics 2012
Yu Wang Todd N Erpelding Ladislav Jankovic Zijian Guo Jean-Luc Robert Guillaume David Lihong V Wang

We present an integrated photoacoustic and ultrasonic three-dimensional (3-D) volumetric imaging system based on a two-dimensional (2-D) matrix array ultrasound probe. A wavelength-tunable dye laser pumped by a Q-switched Nd:YAG laser serves as the light source and a modified commercial ultrasound imaging system (iU22, Philips Healthcare) with a 2-D array transducer (X7-2, Philips Healthcare) d...

2013
Furqan Shaikh Jack Brzezinski Sarah Alexander Cristian Arzola Jose C A Carvalho Joseph Beyene Lillian Sung

Objective To determine whether ultrasound imaging can reduce the risk of failed lumbar punctures or epidural catheterisations, when compared with standard palpation methods, and whether ultrasound imaging can reduce traumatic procedures, insertion attempts, and needle redirections. Design Systematic review and meta-analysis of randomised controlled trials. Data sources Ovid Medline, Embase, and...

2003
Emad M. Boctor Gabor Fichtinger Russell H. Taylor Michael A. Choti

Recent studies have shown that radio frequency (RF) ablation is a simple, safe and potentially effective treatment for selected patients with liver metastases. Despite all recent therapeutic advancements, however, intra-procedural target localization and precise and consistent placement of the tissue ablator device are still unsolved problems. Various imaging modalities, including ultrasound (U...

Journal: :Cancer research 2013
Sunitha V Bachawal Kristin C Jensen Amelie M Lutz Sanjiv S Gambhir Francois Tranquart Lu Tian Jürgen K Willmann

While there is an increasing role of ultrasound for breast cancer screening in patients with dense breast, conventional anatomical ultrasound lacks sensitivity and specificity for early breast cancer detection. In this study, we assessed the potential of ultrasound molecular imaging using clinically translatable vascular endothelial growth factor receptor type 2 (VEGFR2)-targeted microbubbles (...

Introduction: In spite of all the researches on medical imaging, this field is still hot. It is the third major area of research, conducted in the world. Unfortunately, there is no statistical evaluation available of the student theses in Iran. It does not seem like a policy is going to be established to address this issue. Providing a statistical insight to activities done in ...

2012
Animesh Barua

Tumor-associated neoangiogenesis (TAN) is an early event in ovarian cancer (OVCA) development. Increased expression of vascular endothelial growth factor receptor 2 (VEGFR2) by TAN vessels presents a potential target for early detection by ultrasound imaging. The goal of this study was to examine the suitability of VEGFR2-targeted ultrasound imaging agents in detecting spontaneous OVCA in layin...

2016
Alexander S. Hannah Geoffrey P. Luke Stanislav Y. Emelianov

Microbubbles are widely used as contrast agents to improve the diagnostic capability of conventional, highly speckled, low-contrast ultrasound imaging. However, while microbubbles can be used for molecular imaging, these agents are limited to the vascular space due to their large size (> 1 μm). Smaller microbubbles are desired but their ultrasound visualization is limited due to lower echogenic...

2012
Andrej Varchola Eduard Gröller Milos Sramek

Ultrasound (US) imaging is due to its real-time character, low cost, noninvasive nature, high availability, and many other factors, considered a standard diagnostic procedure during pregnancy. The quality of diagnostics depends on many factors, including scanning protocol, data characteristics and visualization algorithms. In this work, several problems of ultrasound data visualization for obst...

Journal: :Optics letters 2011
Liang Song Konstantin Maslov Lihong V Wang

Although ultrasound arrays have been exploited in photoacoustic imaging to improve imaging speed, ultrasound-array-based optical-resolution photoacoustic microscopy (OR-PAM) has never been achieved previously to our knowledge. Here we present our development of multifocal OR-PAM using a microlens array for optical illumination and an ultrasound array for photoacoustic detection. Our system is c...

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