1[1]Maureemootoo K, Webb S, Leach MO, et al. The performance characteristics of a simulator-based CT scanner [J]. IEEE Trans Med Imaging, 1988, 7(2): 91-8.
3[3]Goodenough DJ, Levy JR, Kasales C. Development of phantoms for spiral CT[J]. Comput Med Imaging Graph, 1998, 22(3): 247-55.
4[4]White DR, Speller RD. The measurement of effective photon energy and "linearity" in computerized tomography[J]. Br J Radiol, 1980,53(1):5-11.
5[5]NingRL, ChenB, YuRF, et al. Flatdetector-basedcone-beam volume CT angiography imaging: system evaluation [J]. IEEE Trans Med Imaging, 2000, 19(9): 949-63.
6[6]Josip N, Keith IP, Richard AS. Linearity and contrast scale control in computed tomography [J]. Med Phys, 1989, 16(1): 110-3.