Post-processing technique for reducing metallic clip artifacts i

Details Post-processing technique for reducing metallic clip artifacts i Post-processing technique for reducing metallic clip artifacts i

1991-09-16

1993-09-07

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

36441316, 36441319, 382 54, G06K 900

Patent

active

052436640

ABSTRACT:
Radiation from an x-ray source (14) is collected by radiation detectors (16) to generate an original set of CT line integral data (18). The original CT data is subject to a first order correction and reconstructed (20) to generate a first order corrected image representation (22). A first artifact image representation (26) is generated (24) from the first order corrected image. The artifact image representation and the first order corrected image representation are subtractively combined (28) to generate a second order corrected image representation (30). A bone and high density clip image representation (142) is generated from the second order corrected image. The bone and clip image representation is forward projected (144) to generate a first high contrast line integral data set (146). High contrast model line integral data corresponding to rays which traverse the high density clip are topologically transposed (148) for corresponding rays of the original CT data. The topologically transposed CT data is reconstructed (160) to generate a third order corrected image representation (34). A second artifact image representation (38) is derived (36) from the third order image representation. The second artifact image representation and the third order corrected image representation are subtractively combined (40) to produce a fourth order corrected image representation (42) which is displayed on a video monitor (44) or the like.

REFERENCES:
patent: 4217641 (1980-08-01), Napastok
patent: 4590558 (1986-05-01), Glover et al.
patent: 4792900 (1989-12-01), Jones et al.
patent: 4920491 (1990-04-01), Eberhard et al.
patent: 5123054 (1992-06-01), Hava et al.
"An Algorithm For the Reduction of Metal Clip Artifacts in CT Reconstructions" Glover and Pelc, Med. Phys. vol. 8 No. 6, Nov.-Dec. 1981, pp. 799-807.
"Image Reconstruction From Limited Data", Medoff, et al., International Workshop on Physics and Engineering in Medical Imaging, Mar. 15-18, 1982.
"Reduction of CT Artifacts Caused by Metallic Implants", Kalender, et al. Radiology 1987; 164: 576-577.

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