Purpose: The purpose of this study was to evaluate the effects of target diameter and display-field of view (D-FOV) in modulation transfer function (MTF) by circular edge strategy using the computed tomography (CT) image measurement program “CTmeasure”.
Methods: We calculated the MTF (MTF
edge) using the circular edge strategy applied to cylindrical phantom (200 mm
φ) that inserted with cylinders have 10, 20, 30, and 40 mm diameters. The phantom images were reconstructed using filtered back projection method varied with D-FOV (240, 320, 400, and 500 mm). The study compared both MTF
edge and MTF
wire at MTF
50% and MTF
10% for target diameter and D-FOV, respectively.
Results: The MTF
edge by the different of target diameter indicated in rough compatibility. However, MTF
edge of D-FOV diameters (320, 400, and 500 mm) decreased in the high frequency range.
Conclusions: The circular edge strategy for MTF depended on the D-FOV, however, it was little dependent on target diameter using the CT image measurement program “CTmeasure”.
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