NEMA UD 2-2004 (R2009)

Standard Organization:

NEMA UD 2-2004 (R2009) Acoustic Output Measurement Standard for Diagnostic Ultrasound Equipment Revision 3

Rationale:

This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.

Scope:

This standard covers all active ultrasound apparatus designed for medical diagnostic use, including ultrasonic echo ranging devices (both manual and automatically scanned), through-transmission devices, Doppler echo equipment, and combinations thereof.

This document establishes measurement standards for acoustic output quantities of ultrasonic diagnostic equipment.

Measurements of acoustic output quantities are to be performed in water. However, in order to provide values more typical of what might occur within tissue, derated values of output quantities will be required in addition to the in-water values. To provide an example, detailed derating procedures and requirements are discussed in this standard for a specific model; this is a 0.3 dB/cm-MHz uniform attenuation model, and will be notationally designated by the subscript ".3," i.e., ISPPA.3.

It is anticipated that in the future, different derating factors will be necessary to better represent different applications. The standard provides for the implementation of different derating schemes by the manufacturer, provided that the implementation of that scheme is described.

Code of Federal Regulations:

FDA Guidance:

Guidance for Industry and FDA Staff Information for Manufacturers Seeking Marketing Clearance of Diagnostic Ultrasound Systems and Transducers Document issued on: September 9, 2008