Analysis of the precision of modulation transfer function measurements with a circular edge: influence of object circularity

Maruyama, Sho

doi:10.1117/1.jmi.10.4.043503

Cited by 1 publication

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, MTF on an image is not consistent everywhere, and edge shapes vary depending on object structure. One study showed that a 1% decrease in circularity from the perfect circle condition resulted in an approximately −35% change at the 50% MTF values attributed to rectangular spatial blurring [40], which may affect the uncertainty value of the fitting parameters for different geometry shapes. We calculated MTF in different regions on the CT image of the hole-plate by applying the Fourier transform to the line spread function, as shown in figure 25.…”

Section: Analysis Of Factors Affecting Results and Uncertainty For Ct...mentioning

confidence: 99%

Type A standard uncertainty evaluation in one measurement through uncertainty propagation from voxel values’ distribution for computed tomography metrology

Ou,

Xiao,

Lan

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

According to the Guide to the Expression of Uncertainty in Measurement (GUM), “Type A evaluation” generally requires repeated measurements, which are time-consuming for CT scans. To solve this problem, we developed a method for estimating the standard deviation of measurement results in one measurement through uncertainty propagation, which can be regarded as repeatability standard deviation to evaluate the type A standard uncertainty. The method first fits the CT voxel value distribution, uses the ISO50 method to determine the spatial distribution of surface points from the voxel value distribution and edge shape interpolation, and then derives the measurement results by fitting geometric parameters with the least square algorithm. Finally, the standard deviation of the measurement results is evaluated according to the distribution of the surface point position through uncertainty propagation. We performed simulations and experiments using the hole-plate with 28 holes to compare the uncertainty evaluated by our method and the type A standard uncertainty evaluated on the basis of a series of observations obtained under repeatability conditions. Both simulation and experimental results show that these two uncertainties follow the same statistical variation pattern. The Pearson Correlation Coefficients of the two uncertainties in simulation and experiment are 0.79 and 0.33, respectively, indicating thatthe uncertainty evaluated by the proposed method can directly replace the type A uncertainty or provide a reference similar to type A uncertainty for the evaluation of the combined uncertainty.

show abstract

Section: Analysis Of Factors Affecting Results and Uncertainty For Ct...mentioning

confidence: 99%

Type A standard uncertainty evaluation in one measurement through uncertainty propagation from voxel values’ distribution for computed tomography metrology

Ou,

Xiao,

Lan

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Analysis of the precision of modulation transfer function measurements with a circular edge: influence of object circularity

Cited by 1 publication

References 28 publications

Type A standard uncertainty evaluation in one measurement through uncertainty propagation from voxel values’ distribution for computed tomography metrology

Type A standard uncertainty evaluation in one measurement through uncertainty propagation from voxel values’ distribution for computed tomography metrology

Contact Info

Product

Resources

About