Abstract
FBCT, Ref-DTS-AIP, Ref-DTS-4DCT-Phase and Ref-DTS-4DCT-Amp with OBI-DTS are 5.62mm, 1.56mm, 1.22mm, and 1.20mm, respectively. In scenario 4, the corresponding errors are 4.46mm, 1.60mm, 1.56mm, and 1.00mm, respectively. In summary, Ref-DTS-FBCT has the worst registration accuracy among all the methods. Ref-DTS-4DCT-phase is more accurate than Ref-DTS-AIP for registering moving target position. Preliminary results indicated that the localization accuracy could be further improved with Ref-DTS-4DCT-Amp when breathing amplitude changes dramatically from CT scan to on-board DTS scan. Conclusions: Both Ref-DTS-4DCT-Amp and Ref-DTS4DCT-Phase are potentially very useful for moving target localization when used appropriately for different patient scenarios. Imaging dose can be significantly reduced using these methods compared to 3D or 4D CBCT.
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