![]() Slanted-Edge versus Siemens Star contains a detailed comparison of results. The Siemens Star is included in the ISO 12233:2014 standard along with the slanted-edge and hyperbolic wedge, all of which are supported by Imatest modules. When placed off-axis, the chart will have segments that cover sagittal and tangential directions in addition to vertical and horizontal directions. ![]() Since the Imatest Star module analysis is extremely noise-resistant, measurements are highly repeatable. Siemens star MTF20 (the spatial frequency where MTF is 20% of its low frequency value) is a good estimate of limiting resolution. The Sinusoidal Siemens Star test chart allows you to measure MTF and limiting resolution with a chart that provides angular response and may be less affected by signal processing (especially sharpening) than slanted-edges.
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