Measurement of the spatial resolution and the relative density resolution in an industrial cone-beam micro computed tomography system

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WANG Yan-Fang, UE Jie-Min, CAO Da-Quan, SUN Cui-Li, ZHAO Wei, WEI Cun-Feng, SHI Rong-Jian and WEI Long. Measurement of the spatial resolution and the relative density resolution in an industrial cone-beam micro computed tomography system[J]. Chinese Physics C, 2013, 37(7): 078202. doi: 10.1088/1674-1137/37/7/078202
WANG Yan-Fang, UE Jie-Min, CAO Da-Quan, SUN Cui-Li, ZHAO Wei, WEI Cun-Feng, SHI Rong-Jian and WEI Long. Measurement of the spatial resolution and the relative density resolution in an industrial cone-beam micro computed tomography system[J]. Chinese Physics C, 2013, 37(7): 078202.  doi: 10.1088/1674-1137/37/7/078202 shu
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Received: 2012-08-31
Revised: 2012-11-06
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Measurement of the spatial resolution and the relative density resolution in an industrial cone-beam micro computed tomography system

Abstract: The spatial resolution and the relative density resolution are the two most critical indicators in CT system. The method recommended in the ASTM E1695-95 and GJB 5311-2004 is only suitable to the fan-beam CT system. In this paper, for industrial cone-beam micro CT system, we will adopt the edge response function (ERF) created by the step edges of a steel ball to measure the system 3D PSF and MTF. To describe the contrast discrimination function more accurately, we will first propose to extend the two-dimensional measurement region to the three-dimensional space. Our experimental spatial resolution is (55.56±0.56) lp/mm and the relative density resolution is 1% within 300 μm×300 μm×300 μm according to the 3σ rule.

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