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- W2896884881 abstract "Respiratory tracking using a single fiducial has been considered a method completely lacking of target rotation information. However, the uncertainty of the model is based on the intensity agreement between two sets of 21x21pixel arrays of the position-tracking image and the corresponding DRR’s generated from the planning system . This study is to explore the relationship between target rotation and the uncertainty of a single fiducial-based system. A respiratory motion phantom was used to simulate a lung tumor target. In test “A”, a 64 mm mini-ball cube with three 5x1 mm cylindrical fiducials was inserted to the lung module. One fiducial was used for the model. In the test “B”, a single 0.4x20mm fiducial, folded to about 3x5mm spherical cluster, was imbedded in the lung module. During treatment, 2 cm longitudinal, linear lung tumor motion was simulated, combined with different, fixed, yaw rotational angles between 0 – 60°. Rotational boundary corrections were automatically disabled while the tracking model was obtained. The uncertainties of the final tracking models displayed on the treatment console were recorded by averaging 15 images' uncertainties taken during module's longitudinal motion. Yaw angles from 0-60° in 10-degree intervals respective to initial simulation image were used. The test was repeated with each phantom twice. An End-to-End test was performed. Motion of phantom with yaw rotation results in a significant increase of the single fiducial-based tracking uncertainty for both types of fiducials, the cylindrical and cluster. (Table 1). Both uncertainties significantly increase from 0-60°. The cylindrical fiducial uncertainty ranged from 18% to 58% from 0-60°.The clustered fiducial uncertainty ranged from 17% to 26% from 0-60°. Cylindrical fiducial uncertainty is higher than that from the spherical fiducial for all yaw angles. Greater than 1mm treatment inaccuracy was indicated per its End-to End film dosimetry test when the uncertainty exceeded the default value (40%).Abstract TU_26_3147; Table 1Uncertainty (%) as function of yaw angle for two different fiducials. Ucyl - cylindrical Uncertainty Uclu - Spherical Cluster Uncertainty Scyl -Cylindrical Std dev Sclu - Spherical ClusterYaw Angle°Ucyl%Uclu%scyl%sclu%018.517.00.311.011019.617.70.820.512023.719.20.670.743030.821.80.640.604039.523.90.460.474544.624.60.480.805049.724.90.380.596057.725.70.350.57 Open table in a new tab This investigation suggests that the uncertainty of the model can directly imply the degree of yaw rotation of the target when a single unsymmetrically-shaped fiducial is used. The type and shape of this fiducial also contribute to the sensitivity of rotational detection in respiratory tracking." @default.
- W2896884881 created "2018-10-26" @default.
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- W2896884881 date "2018-11-01" @default.
- W2896884881 modified "2023-09-26" @default.
- W2896884881 title "Impact of Target Rotational Deviations in a Single Fiducial Based Respiratory Tumor Tracking" @default.
- W2896884881 doi "https://doi.org/10.1016/j.ijrobp.2018.07.1391" @default.
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