Correction of motion artifacts in cone-beam CT using a patient-specific respiratory motion model.

Medical Physics
Qinghui ZhangGig S Mageras

Abstract

Respiratory motion adversely affects CBCT image quality and limits its localization accuracy for image-guided radiation treatment. Motion correction methods in CBCT have focused on the thorax because of its higher soft tissue contrast, whereas low-contrast tissue in abdomen remains a challenge. The authors report on a method to correct respiration-induced motion artifacts in 1 min CBCT scans that is applicable in both thorax and abdomen, using a motion model adapted to the patient from a respiration-correlated image set. Model adaptation consists of nonrigid image registration that maps each image to a reference image in the respiration-correlated set, followed by a principal component analysis to reduce errors in the nonrigid registration. The model parametrizes the deformation field in terms of observed surrogate (diaphragm or implanted marker) position and motion (inhalation or exhalation) between the images. In the thorax, the model is obtained from the same CBCT images that are to be motion-corrected, whereas in the abdomen, the model uses respiration-correlated CT (RCCT) images acquired prior to the treatment session. The CBCT acquisition is a single 360 degrees rotation lasting 1 min, while simultaneously recording patie...Continue Reading

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Citations

Oct 4, 2011·Physics in Medicine and Biology·Zhihua Qi, Guang-Hong Chen
Apr 6, 2013·Medical Physics·Yongbin ZhangLei Dong
Oct 14, 2011·Medical Physics·Zhihua Qi, Guang-Hong Chen
Nov 7, 2012·Medical Physics·Hao GaoLei Xing
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