Range/velocity limitations for time-domain blood velocity estimation

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Range/velocity limitations for time-domain blood velocity estimation.

The traditional range/velocity limitation for blood velocity estimation systems using ultrasound is elucidated. It is stated that the equation is a property of the estimator used, not the actual physical measurement situation, as higher velocities can be estimated by the time domain cross-correlation approach. It is demonstrated that the time domain technique under certain measurement condition...

متن کامل

Implementation of Ultrasound Time-domain Cross-correlation Blood Velocity Estimators Implementation of Ultrasound Time-domain Cross-correlation Blood Velocity Estimators

The implementationof real-time blood velocity estimators using time-domain cross-correlation is investigated. The basic algorithm is presented for doing stationary echo canceling, cross-correlation estimation and subsequent velocity estimation. Sampled data acquired at rates of approximately 20 MHz are used in the algorithm imposing a heavy burden on the signal processing hardware. The algorith...

متن کامل

Large Scale Experiments Data Analysis for Estimation of Hydrodynamic Force Coefficients Part 1: Time Domain Analysis

This paper describes various time-domain methods useful for analyzing the experimental data obtained from a circular cylinder force in terms of both wave and current for estimation of the drag and inertia coefficients applicable to the Morison’s equation. An additional approach, weighted least squares method is also introduced. A set of data obtained from experiments on heavily roughened circul...

متن کامل

Stationary Echo Canceling in Velocity Estimation by Time-domain Cross-correlation Stationary Echo Canceling in Velocity Estimation by Time-domain Cross-correlation

The application of stationary echo canceling to ultrasonic estimation of blood velocities using time-domain cross-correlation is investigated. Expressions are derived that shows the innuence from the echo canceler on the signals that enter the cross-correlation estimator. It is demonstrated that the ltration results in a velocity dependent degradation of the signal-to-noise ratio. An analytic e...

متن کامل

Discrete-time adaptive windowing for velocity estimation

We present methods for velocity estimation from discrete and quantized position samples using adaptive windowing. Previous methods necessitate tradeoffs between noise reduction, control delay, estimate accuracy, reliability, computational load, transient preservation, and difficulties with tuning. In contrast, a first-order adaptive windowing method is shown to be optimal in the sense that it m...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Ultrasound in Medicine & Biology

سال: 1993

ISSN: 0301-5629

DOI: 10.1016/0301-5629(93)90091-2