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

WANG Yan-Fang; UE Jie-Min; CAO Da-Quan; SUN Cui-Li; ZHAO Wei; WEI Cun-Feng; SHI Rong-Jian; WEI Long

doi:10.1088/1674-1137/37/7/078202

Chinese Physics C> 2013, Vol. 37> Issue(7) : 078202 DOI: 10.1088/1674-1137/37/7/078202

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

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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.

References

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CHEN Zi-Kuan, NING Ruo-La. Proc. of SPIE, 2007. 65100F[2] E1695-1995. American Society for Testing and Material(ASTM), 1995[3] GJB5311-2004, National Military Standard (NMS), 2004[4] CHEN Z K, NING R L. Phy. Med. Bio., 2004, 49(10): 1865-1880[5] YAN Yong-Lian, LIU Li, QUE Jie-Min et al. The Tenth. Conf. on NDT Tech., 2007. 56[6] CHEN Z K, NING R L, Conover D et al. Opt. Eng., 2006, 45(9): 97003-1-11[7] Van de Casteele E, Van Dyck D, Sijbers J et al. Phy. Med. Ima., 2004, 5370: 2089-2096[8] La Feldkamp, Lc Davis, Jw Kress, J. Opt. Soc. Am. A, 1984, 1(6): 612-619[9] Canny J. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1986, PAMI-8(6): 679-698

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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

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Received: 2012-08-31
Revised: 2012-11-06

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2012-08-31
Accepted Date: 2012-11-06
Available Online: 2013-07-05

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.