[1] FELDKAMP L A, DAVIS L C, KRESS J W. Practical cone-beam algorithm［J］. JOSA A, 1984,1(6):612-619.

[2] NOO F, CLACKDOYLE R, MENNESSIER C, et al.. Analytic method based on identification of ellipse parameters for scanner calibration in cone-beam tomography［J］. Phys Med Biol, 2000,45(11):3489-3508.

[3] YANG K, KWAN A L, MILLER D F, et al.. A geometric calibration method for cone beam CT systems［J］. Med Phys, 2006,33(6):1695-1706.

[4] ZHANG F, JIANG H, YAN B, et al.. Geometric calibration for half-cover scanning in circular cone-beam CT［J］. Opt. Precision Eng., 2013, 21(7):1559-1665.(in Chinese)

[5] SMEKAL L V, KACHELRIEβ M, STEPINA E, et al.. Geometric misalignment and calibration in cone-beam tomography［J］. Medical Physics, 2004,31(12):3242.

[6] CHO Y, MOSELEY D J, SIEWERDSEN J H, et al.. Accurate technique for complete geometric calibration of cone-beam computed tomography systems［J］. Med Phys, 2005,32(4):968-983.

[7] LI X, ZHANG D, LIU B. A generic geometric calibration method for tomographic imaging systems with flat-panel detectors—A detailed implementation guide ［J］. Medical Physics, 2010,37(7):3844.

[8] LI Y Q, LIN H B.Camera calibration in morphology measurement of axisymmetric body［J］. Opt. Precision Eng., 2011, 19(8):1957-1963.(in Chinese)

[9] GROSS D, HEIL U, SCHULZE R, et al.. Auto calibration of a cone-beam-CT［J］. Medical Physics, 2012,39(10):5959.

[10] KINGSTON A, SAKELLARIOU A, VARSLOT T, et al.. Reliable automatic alignment of tomographic projection data by passive auto-focus ［J］. Medical Physics, 2011,38(9):4934.

[11] YUANZHENG M, HUI G, XIAOQUAN Y. Online geometric calibration of cone-beam computed tomography for arbitrary imaging objects［J］. IEEE Transactions on Medical Imaging, 2013,32(2):278-288.

[12] SAWALL S, KNAUP M, KACHELRIEβ M. A robust geometry estimation method for spiral, sequential and circular cone-beam micro-CT［J］. Medical Physics, 2012,39(9):5384.

[13] HARTLEY R, ZISSERMAN A. Multiple View Geometry in Computer Vision［M］. Cambridge Univ. Press, 2000.

[14] COLOMBO C, DEL B A, PERNICI F. Metric 3D reconstruction and texture acquisition of surfaces of revolution from a single uncalibrated view［J］. IEEE Trans. Pattern Anal. Mach. Intell., 2005,27(1):99-114.

[15] XU J, TSUI B M. A graphical method for determining the in-plane rotation angle in geometric calibration of circular cone-beam CT systems［J］. IEEE Trans. Med. Imaging, 2012,31(3):825-833.

[16] FITZGIBBON A, PILU M, FISHER R B. Direct least square fitting of ellipses［J］. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1999,21(5):476-480.

[17] ZOU X B, ZENG L. Half-cover scanning and reconstructing for helical cone-beam CT ［J］. Opt. Precision Eng., 2010,18(2):434-442.(in Chinese)