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. At the same time, it’s frustrating that creating affordable housing is so extremely complex when we all know that housing is the answer to homelessness.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. I’m grateful to our partners at Evernorth, who have developed the expertise to navigate and blend various funding sources and their myriad regulations. But sometimes it tries to accomplish so much within a single project or policy that it ends up failing to accomplish anything at all.” If it can get it all done, then it has done much more. It adds goals - many of them laudable - and in doing so, adds obstacles, expenses and delays. From the story, “You might assume that when faced with a problem of overriding public importance, government would use its awesome might to sweep away the obstacles that stand in its way. As our latest affordable housing project gets out of the ground, this article hits home.
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