YY/T 0643-2008Methods of measuring the performance of ultrasonic pulse-echo diagnostic equipment (English PDF)

1.1 Scope

This standard defines the pulse-echo measurement described in medical diagnostic system performance parameters, and gives the test methods.

This standard applies to single-element transducer array of ultrasonic diagnostic equipment in the ultrasonic frequency range 0.5MHz ~ 25MHz. This standard does not apply to ultrasound systems.

1.2 Purpose

It provides general acceptable basis for the measurement and reporting of the entire diagnostic system main performance parameters, especially for similar diagnostic applications without Between manufacturers of similar devices to provide the same basis for comparison, select the specified performance parameters and the corresponding measurement method. Furthermore, the purpose of To obtain a set of measurements and results from the application of the recommended method provided useful basis for predicting the device performance in a particular diagnostic applications.

In order to be able to generally applicable, in a specified process without using expensive and common equipment. When the basic system has about a specific diagnosis system When the member (such as a transducer) a variety of optional, when applicable requirements of this standard will each option as a separate system.

The main part of the standard consists of six terms, namely to specify a specific system performance parameter (or a group of related articles in each Parameters) and give the appropriate measurement method.

The necessary data and measurement methods, principles and related equipment (applies to two or more terms) is given in the Appendix.

Measuring the acoustic output of diagnostic equipment have been proposed in other publications, and therefore not specified in this standard.

2.1 Transducer element

Made of a specific material capable of electrical energy into mechanical energy but also mechanical energy into electrical energy element.

2.2 Transducer

Design of the input signal at the output of the desired characteristics of the output signals received from the system and provide a signal to another device of the system. Head of Prior to the actual applications, the transducer this term represents the complete mechanical assemblies, including the transducer element and the damping of mechanical and electronic And matching means.

2.3 Standard working distance

The transducer in the water, from the surface of the transducer element to the left from the transducer beam axial direction of the last one of the most sound pressure.

Great value distance between locations. For a circular plane without any means focusing transducer element, standard working distance of about equal Rao 2/lambda, which Lambda is the medium in the water and the operating frequency corresponding to the acoustic wavelength, Rao is the transducer element metallized area of a circle radius.

2.4 Beam axis

At a distance of more than the standard working distance of the ultrasound beam, the straight line connecting the measured spatial-peak amplitude of the sound pressure points (in accordance with the rules of the regression calculation).

For a non-focused transducer emitting acoustic beam must be doubled to twice the standard within the scope of the working distance at equal intervals to select these points.

For focused transducer (status unknown or focusing transducers) must be standard operating distance on both sides of the point (but no more than two of the distance Fold) in the lower lobe level at least 10dB maximum sound pressure amplitude than the center of the beam area next to any beam measured at equal intervals to select these points.