New approaches to contrast agent modelling
نویسندگان
چکیده
Current options for modelling contrast agent nonlinearities do not predict acoustic propagation. Other popular formulae are restricted to the linear steady state (e.g. for crosssections, sound speed and attenuation). Hence all options for modelling contrast agents have limited applicability to most of the insonification conditions to which they are exposed in vivo. This paper provides a theoretical framework into which any nonlinear single-bubble model can be input, to predict the sound speeds and attenuations which clouds of contrast agents would produce. These two propagation characteristics are fundamental to the quantitative interpretations of signals from contrast agents in the clinical environment.
منابع مشابه
A New Potential Contrast Agent for Magnetic Resonance Imaging: Iron Oxide-4A Nanocomposite
Background: Magnetic resonance imaging (MRI) contrast agents have an important role to differentiate healthy and diseased tissues. Access and design new contrast agents for the optimal use of MRI are necessary. This study aims to evaluate iron oxide–4A nanocomposite ability to act as a magnetic resonance imaging contrast agent.Materials and Methods: Iron oxide–4A nanocomposite (F4A) was syn...
متن کاملEmergency department resource optimisation for improved performance: a review
Emergency departments (EDs) have been becoming increasingly congested due to the combined impacts of growing demand, access block and increased clinical capability of the EDs. This congestion has known to have adverse impacts on the performance of the healthcare services. Attempts to overcome with this challenge have focussed largely on the demand management and the application of system wide p...
متن کاملA Robust Feedforward Active Noise Control System with a Variable Step-Size FxLMS Algorithm: Designing a New Online Secondary Path Modelling Method
Several approaches have been introduced in literature for active noise control (ANC)systems. Since Filtered-x-Least Mean Square (FxLMS) algorithm appears to be the best choice as acontroller filter. Researchers tend to improve performance of ANC systems by enhancing andmodifying this algorithm. This paper proposes a new version of FxLMS algorithm. In many ANCapplications an online secondary pat...
متن کاملLocalized Aortic Root Dissection Secondary to Contrast Agent Injection: Feasibility of Conservative Follow-up With Echocardiography
Introduction: Iatrogenic aortocoronary dissection (ACD) is a nightmare in interventional cardiology. Although ACD is rarely reported, the real-world prevalence is suspected of being higher due to unreported cases. The right coronary artery (RCA) ostium is involved in the majority of cases, and dissections are usually limited to the aortic sinus in half of the clinical presentat...
متن کاملModelling Integrated Multi-item Supplier Selection with Shipping Frequencies
There are many benefits for coordination of multiple suppliers when single supplier cannot satisfy buyer demands. In addition, buyer needs to purchase multiple items in a real supply chain. So, a model that satisfies these requests has many advantages. We extend the existing approaches in the literature that assume all suppliers need to be put on a common replenishment cycle and each supplier ...
متن کامل