Abstract

Info

Title:: Effects of fiducial artifact on dose calculation and distribution of Cyberknife treatment

Author(s):: JING Sheng-hua; LI Ao-mei; JI Xiao-qin; SHEN Ze-tian; ZHOU Han; LI Bing; ZHU Xi-xu; Department of Radiation Oncology, General Hospital of Eastern Theater Command, Nanjing 210002, China

Keywords:: Keywords: Cyberknife fiducial artifact dose calculation dose distribution

Abstract:: Abstract: Objective To analyze the effects of fiducial artifact on the dose calculation and distribution of Cyberknife treatment. Methods The original CT images and the CT images without fiducial artifacts of Lucy phantom were acquired by the GSI scanning technology of energy spectral CT and MARS reconstruction technology. Cyberknife Multiplan?system was used for the design and calculation of the isocentric plan based on the two groups of CT images, and the effects of fiducial artifacts on the dose calculation and distribution were analyzed. Results The CT value of the artifact area on the CT images was affected by fiducial artifact, and the maximum change was up to 63.22%. The existence of fiducial artifact led to the underestimation of the maximum dose of the normal tissues around the fiducial (artifact area), and the overestimations of the minimum dose of the normal tissues around the fiducial (artifact area) and PTVdose coverage. Conclusion Energy spectral CT can be used to reduce the effect of fiducial artifact on the dose calculation and distribution of Cyberknife treatment.