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Recognized Consensus Standards

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Part B: Supplementary Information Sheet (SIS)
FR Recognition List Number 028 Date of Recognition 03/16/2012 
FR Recognition Number 12-105
Standard
NEMA UD 2-2004 (R2009)
Acoustic Output Measurement Standard for Diagnostic Ultrasound Equipment Revision 3
Scope/Abstract
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.

Extent of Recognition
Complete standard
Rationale for Recognition
This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.
Public Law, CFR Citation(s) and Procode(s)
Regulation Number Device Name Device Class Product Code
§892.1570 Media, Coupling, Ultrasound Class 2 MUI
§892.1570 Transducer, Ultrasonic, Diagnostic Class 2 ITX
§892.1560 System, Imaging, Pulsed Echo, Ultrasonic Class 2 IYO
§892.1550 System, Imaging, Pulsed Doppler, Ultrasonic Class 2 IYN
§892.1540 Monitor, Ultrasonic, Nonfetal Class 2 JAF
Relevant FDA Guidance and/or Supportive Publications
Guidance for Industry and FDA Staff Information for Manufacturers Seeking Marketing Clearance of Diagnostic Ultrasound Systems and Transducers Document issued on: September 9, 2008
FDA Technical Contacts
 Keith Wear
  FDA/OMPT/CDRH/OSEL/DAM/
  301-796-2538
  keith.wear@fda.hhs.gov
 Lauren N. Hefner
  FDA/OMPT/CDRH/OIR/DRH/MUIS/
  301-796-6881
  lauren.hefner@fda.hhs.gov
Standards Development Organization
NEMA National Electrical Manufacturers Association https://www.nema.org/
FDA Specialty Task Group (STG)
Radiology
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