放射線治療計画における義歯アーチファクトの影響と改善策 : ガントリ傾斜撮影から再構成したCT水平断像の利用

概要

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Intensity-modulated radiation therapy(IMRT) radiation treatment planning(RTF) requires accuracy. Metal artifacts are one of the factors that influence RTF. The metal artifacts from dental structures are problems at the level of the oropharynx, since these artifacts impair visualization of tumors or lymph nodes and change CT(computed tomography) values. We simulated RTF at the level of the oropharynx using CT images with and without artifacts from dental structures. Gantry tilt scanning was performed to avoid artifacts from dental structures and transverse images reconstructed from oblique images by gantry tilt scanning using a technique of multiplanar reconstruction(MPR). The reconstructed transverse images were used for the RTF. The reconstructed transverse images were useful to obtain accurate target volumes and the RTF of two opposed equally weighted beams by correct CT values. As dose distribution was changed slightly by the metal artifacts, the use of CT images without artifact is recommended in RTF.
社団法人日本放射線技術学会の論文
2007-03-20