Figure 3 shows images for target localization for the patient in Figure 1. The CBCT image is matched to the planning CT image. The CBCT image datasets was reconstructed from the full projection set with a pixel pitch of 1 mm in all dimensions. From the full projection set, the projections at maximum inspira- tion and maximum expiration were used to generate respiration correlated CBCT images shown in Fig- ure 4. The image datasets acquired using respiration correlated CBCT at the time of treatment can be used to compare to the 4DCT image data acquired at the time of planning, although both methods employ different surrogates and data for sorting.
Table I shows the volumes of the targets treated for each patient. In seven of the 12 patients, a helical scan was done to comply with the RTOG 0236 study; however a 4DCT scan was also acquired to assess target motion. Table I indicates the PTV volume based on both helical and 4DCT for these patients. For 11 patients treated, targets were peripheral and located in the upper lobe. In one patient, the lesion was in the lower lobe and adjacent to both the stomach and heart. For this patient, we used a more conservative dose fractionation sche- dule to limit normal tissue toxicity.
Table II shows the 4DCT measured tumour motion at the time of planning and the average tumour motion for each treatment fraction mea- sured using respiration correlated CBCT at the treatment unit. The data represents the tumour amplitude in three dimensions following target localization using the full projection CBCT dataset and the reference CT dataset for matching. Four of
Figure 3 shows images for target localization for the patient in Figure 1. The CBCT image is matched to the planning CT image. The CBCT image datasets was reconstructed from the full projection set with a pixel pitch of 1 mm in all dimensions. From the full projection set, the projections at maximum inspira- tion and maximum expiration were used to generate respiration correlated CBCT images shown in Fig- ure 4. The image datasets acquired using respiration correlated CBCT at the time of treatment can be used to compare to the 4DCT image data acquired at the time of planning, although both methods employ different surrogates and data for sorting.
Table I shows the volumes of the targets treated for each patient. In seven of the 12 patients, a helical scan was done to comply with the RTOG 0236 study; however a 4DCT scan was also acquired to assess target motion. Table I indicates the PTV volume based on both helical and 4DCT for these patients. For 11 patients treated, targets were peripheral and located in the upper lobe. In one patient, the lesion was in the lower lobe and adjacent to both the stomach and heart. For this patient, we used a more conservative dose fractionation sche- dule to limit normal tissue toxicity.
Table II shows the 4DCT measured tumour motion at the time of planning and the average tumour motion for each treatment fraction mea- sured using respiration correlated CBCT at the treatment unit. The data represents the tumour amplitude in three dimensions following target localization using the full projection CBCT dataset and the reference CT dataset for matching. Four of
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