Journal ArticleDOI
Coded excitation system for improving the penetration of real-time phased-array imaging systems
Reads0
Chats0
TLDR
A very simple coded excitation for phased arrays based on the principles of 'pseudochirp' excitation and equalization filtering is described, capable of SNR improvements of about 15 dB with range sidelobe levels acceptable for many medical imaging applications.Abstract:
Based on an analysis of the inherent signal-to-noise ratio (SNR) in medical ultrasound imaging, SNR improvements of 15-20 dB are theoretically possible for real-time phased-array imagers using coded excitation. A very simple coded excitation for phased arrays based on the principles of 'pseudochirp' excitation and equalization filtering is described. This system is capable of SNR improvements of about 15 dB with range sidelobe levels acceptable for many medical imaging applications. Such improvements permit increased operating frequencies, and hence enhanced spatial resolution, for real-time array imagers. Both simulations and measurements are used to demonstrate the efficacy of the method. >read more
Citations
More filters
Patent
Transducer array imaging system
TL;DR: In this article, the authors consider methods and devices for communicating an acoustic emission via an array of transducers and wirelessly communicating data via a transceiver, where the transceiver may be in communication with the array of Transducers.
Journal ArticleDOI
Synthetic Aperture Ultrasound Imaging
TL;DR: The paper describes the use of synthetic aperture (SA) imaging in medical ultrasound, where data is acquired simultaneously from all directions over a number of emissions, and the full image can be reconstructed from this data.
Journal ArticleDOI
Use of modulated excitation signals in medical ultrasound. Part I: basic concepts and expected benefits
TL;DR: This paper, the first from a series of three papers on the application of coded excitation signals in medical ultrasound, discusses the basic principles and ultrasound-related problems of pulse compression and the selection of coded waveforms suitable for ultrasound imaging.
Journal ArticleDOI
Coded excitation for diagnostic ultrasound: a system developer's perspective
R.Y. Chiao,Xiaohui Hao +1 more
TL;DR: This paper compares chirp and Golay code performance with respect to image quality and system requirements, then shows clinical images that illustrate the current applications of coded excitation in B-mode, harmonic, and flow imaging.
Journal ArticleDOI
Use of modulated excitation signals in medical ultrasound. Part II: design and performance for medical imaging applications
TL;DR: Design methods of linear FM signals and mismatched filters are presented, in order to meet the higher demands on resolution in ultrasound imaging, and it is shown that for the small time-bandwidth products available in ultrasound, the rectangular spectrum approximation is not valid, which reduces the effectiveness of weighting.
References
More filters
Journal ArticleDOI
Scattering of Ultrasound by Blood
TL;DR: The ultrasonic volumetric scattering cross section of the erythrocyte has been measured over a range of frequencies by comparing the rms value of the gated backscattered signal from the blood with that of a wave reflected from a flat reflector with known reflection coefficient.
Journal ArticleDOI
Relationship between collagen and ultrasonic backscatter in myocardial tissue
TL;DR: The results of this study may suggest that the magnitude of ultrasonic scattering in regions of remote myocardial infarct is sensitive not only to the concentration of molecular collagen but also to the organizational state of this structural protein.
Journal ArticleDOI
Analysis and measurement of ultrasound backscattering from an ensemble of scatterers excited by sine‐wave bursts
Rubens A. Sigelmann,John M. Reid +1 more
TL;DR: In this article, the authors developed a practical approximation for the backscattering of periodic bursts of sine waves by a volume of randomly distributed scatterers, which is applied to the measurement of a volumetric backscatter cross section, using a substitution method in which the rms value of the gated backscattered signal is compared with the value of a wave reflected from a target of known coefficient of reflection.
Journal ArticleDOI
An investigation of a spread energy method for medical ultrasound systems: Part one: Theory and investigation
TL;DR: In this article, a medical ultrasound device using a Golay code was proposed and investigated theoretically, enabling the spread energy method to be used to help overcome the restraints of the parameters of resolution, peak power and penetration.
Related Papers (5)
Coded excitation for diagnostic ultrasound: a system developer's perspective
R.Y. Chiao,Xiaohui Hao +1 more