Calibrating and Measuring CT Density ASTM E1935

Calibrating and Measuring CT Density ASTM E1935

ASTM E1935 provides the knowledge for measuring the density calibration of X- and γ-ray computed tomography (CT) systems and using this information to determine material densities from CT images. All values are stated in SI units.

    Scope:

    ASTM E1935 is an excellent method for measuring density variations; these measurements can evaluate parts, compare different systems, or characterize a particular system. This method is helpful for the determination of the adequate X-ray energy of a CT system. The ASTM E1935 test method is more precise and less susceptible to errors than other CT-based approaches.

    Test Procedure:

    In ASTM E1935, measured mean CT values of the known standards are determined from an image evaluation, and their linear attenuation coefficients are calculated by multiplying their measured physical density by their published mass attenuation coefficient. The density calibration is accomplished by applying linear regression to the data. Once calibrated, the linear attenuation coefficient of an unknown feature in an image is measured by determining its mean CT value. Its density is then extracted from a knowledge of its mass attenuation coefficient.

    Data:

    The linear attenuation coefficient of the region of interest is obtained using the equation from the known calibration parameters.

    NCT = a·μ + b 

    Here μ is the linear attenuation coefficient and N CT is the CT number.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services

    POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services

    POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services

    POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have 500+ Material Test already Done for top companies

      Send us a request

        idea icon

        Want to connect with an expert before you leave?