SU-E-T-404: A Prototype Program for Analyzing 4D Image Guidance Shifts for Lung SBRT

Medical Physics
Brian WangBill J Salter

Abstract

A prototype in-house program was developed to assist deriving image guidance shifts clinically using our 4DCT method for lung SBRT. Our in-house prototype program was implemented in MATLAB. The 4D DICOM CT dataset of interest is imported by the program from AW and subsequently accepts input from the user regarding the desired relative IGRT shifts. The DICOM header information defining the relative 4D dataset origin is then read in and the desired relative IGRT shifts are applied to re-define the origin for the dataset that is to be shifted. Lastly, the redefined (shifted) origin coordinates are written to the header of the 4D dataset and the dataset is then exported to AW as DICOM files. We used this program to process 4DCT datasets for four patients with 3-5 fractions each. The clinical shifts that were derived previously, without this program, were applied to the images and the acceptability of these shifts were evaluated. All slices and planes of the shifted 4D dataset were reviewed and, in general, demonstrated acceptable re-centering of the target within the ITV. However, it is noted that some small adjustments to the shift coordinates would likely have been made had we had the opportunity to visualize the shifted 4D datas...Continue Reading

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