Characterization of a thin film phantom for contrast and resolution measurements

A novel test device that has the potential to facilitate day-to-day maintenance and quality assurance of ultrasonic medical imaging systems was developed and tested. The device consists of small echogenic particles deposited on a thin film substrate in patterns similar to those found on conventional eye charts, which can be scanned to produce recognizable images that can be quantitatively evaluated in a quick and repeatable fashion. An evaluation system consisting of this device and a related assessment methodology was tested at several locations by both physicians and sonographers. The results of the testing and responses of the users were both encouraging and insightful.

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Thin film phantom for blood flow simulation

McAleavey

Hah²,

Parker³

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121)

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The Thin Film Phantom is a new type of ultrasound resolution test object. It is comprised of a thin planar substrate that is acoustically matched to the surrounding media. Precisely located scatterers on the surface of the substrate generate echo signals. We show that by vibrating the substrate in a suitable manner, an echo signal may be generated which simulates bi-directional flow. We demonstrate that a vibration of low amplitude at frequency fo produces a Doppler spectral signal at fo and -fo, within the limits of aliasing. Furthermore, by driving the film with a bandlimited noise signal, we illustrate how a velocity distribution may be simulated. A time-varying flow velocity may be simulated by varying the noise bandwidth with time. Finally, using this technique we demonstrate a system that simulates an arterial flow pattern including its characteristic velocity distribution, in forward and reverse directions simultaneously.

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Characterization of a thin film phantom for contrast and resolution measurements

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A thin film phantom for blood flow simulation and Doppler test

A thin film phantom for blood flow simulation and Doppler test

Analysis and evaluation of a novel quality assurance device for ultrasonic medical imaging systems

Thin film phantom for blood flow simulation

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