Cone beam CT: Transforming radiation treatment guidance, planning, and monitoring

2014 ◽  
pp. 241-252
Keyword(s):  
Radiation Treatment ◽  
Cone Beam Ct ◽  
Cone Beam

scholarly journals Positioning errors of metal localization devices with motion artifacts on kV and MV cone beam CT

BJR|Open ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 20190013
Author(s):  
Teh Lin ◽  
Chang-Ming Charlie Ma
Keyword(s):  
Radiation Treatment ◽  
Cone Beam Ct ◽  
Motion Artifacts ◽  
Cone Beam ◽  
Breathing Cycle ◽  
Metal Artifacts ◽  
Motion Direction ◽  
Image Guided Radiation Therapy ◽  
Positioning Errors ◽  
Image Volume

Objective: To investigate motion artifacts on kV CBCT and MV CBCT images with metal localization devices for image-guided radiation therapy. Methods: The 8 μ pelvis CBCT template for the Siemens Artiste MVision and Pelvis template for the Varian IX on-board Exact Arms kV were used to acquire CBCT images in this study. Images from both CBCT modalities were compared in CNRs, metal landmark absolute positions, and image volume distortion on three different planes of view. The images were taken on a breathing-simulated thoracic phantom in which several typical metal localization devices were implanted, including clips and wires for breast patients, gold seeds for prostate patients, and BBs as skin markers. To magnify the artifacts, a 4 cm diameter metal ball was also implanted into the thoracic phantom to mimic the metal artifacts. Results: For MV CBCT, the CNR at a 4 sec breathing cycle with 1 cm breathing amplitude was 5.0, 3.4 and 4.6 for clips, gold seeds and BBs, respectively while it was 1.5, 2.0 and 1.6 for the kV CBCT. On the images, the kV CBCT showed symmetric streaking artifacts both in the transverse and longitudinal directions relative to the motion direction. The kV CBCT images predicted 89 % of the expected volume, while the MV CBCT images predicted 95 % of the expected volume. The simulated soft tissue observed in the MVCT could not be detected in the kV CBCT. Conclusion: The MV CBCT images showed better volume prediction, less streaking effects and better CNRs of a moving metal target, i.e. clips, BBs, gold seeds and metal balls than on the kV CBCT images. The MV CBCT was more advantageous compared to the kV CBCT with less motion artifacts for metal localization devices. Advances in knowledge: This study would benefit clinicians to prescribe MV CBCT as localization modality for radiation treatment with moving target when metal markers are implanted.

scholarly journals Evaluation of Elekta 4D cone beam CT-based automatic image registration for radiation treatment of lung cancer

2015 ◽  
Vol 88 (1053) ◽  
pp. 20140620 ◽  
Author(s):  
Jun Li ◽  
Amy Harrison ◽  
Yan Yu ◽  
Ying Xiao ◽  
Maria Werner-Wasik ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Image Registration ◽  
Radiation Treatment ◽  
Cone Beam Ct ◽  
Cone Beam
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