Customer Service:
Mon - Fri: 8:30 am - 6 pm EST

 Most recent

ASME B89.4.23-2020

X-Ray Computed Tomography (CT) Performance Evaluation

The application of X-ray computed tomography (CT) for dimensional metrology has become common in many industries. This is primarily due to the ability of CT systems to measure inside a workpiece without requiring tactile or optical access. However, there are currently no standards that address the performance evaluation of CT systems in a way that includes material influence, which is a dominant source of error when these systems are used to evaluate typical workpieces. For this reason, The American Society of Mechanical Engineers (ASME) decided to form the B89.4.23 Working Group to produce a standard for CT performance evaluation. This Standard is the result of significant effort by the working group to develop a performance evaluation that includes all known sources of error in CT systems.  This Standard provides definitions and a test procedure for the performance evaluation of X-ray CT systems used for dimensional measurements. Manufacturers and users of CT systems may use the results of the test procedure to fulfill contractual requirements or to compare the performance of systems from different suppliers or over time.  The test procedure described in this Standard is intended to report errors that are representative oftypical use cases of CT systems. Users of this Standard seeking to determine measurement error or uncertainty for a particular workpiece or system configuration should perform a specific study for that case.  This Standard is available for public review on a continuing basis. This provides an opportunity for additional public review input from industry, academia, regulatory agencies, and the public-at-large. This first edition of ASME B89.4.23 was approved by the American National Standards Institute on September 3, 2020.

Content Provider
American Society of Mechanical Engineers [ASME]


As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.