Departmental Bulletin Paper コーンビーム CT 画像の散乱線補正が領域分割精度に 与える影響の検討

久保田, 純加

The purpose of the study is to use a cone beam CT for the radiation therapy. A cone beam CT system attached to a linear accelerator has no collimator to avoid scattered photons originated in a patient body.So the reconstructed CT values are affected by scattered photons, as a result of it, the CT values are inaccurate. To remove the scattered photons, a scatter kernel method was used in the process of image reconstruction with a maximum likelihood expectation maximization method. The feasibility of the proposed method was evaluated with the result of segmented regions comparing the multi-slice CT and scatter corrected cone beam CT image. Our proposed method could segment the bone, soft tissue and lungareas as well as with the result of the multi-slice CT images.Key Words : cone beam CT, maximum likelihood expectation maximization method, scatter correction

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