SU-E-I-09: Patient Organ Doses from KV-CBCT Acquisitions as Function of Patient Size and Scan Protocols

Medical Physics
Alan P Nelson, George X Ding

Abstract

To investigate the organ dose dependence on patient size and position resulting from an image guidance procedures. Depending upon the degree of variability between patients, the feasibility tabulating the organ dose based upon patient size and imaging acquisition procedure. Such tables could be useful in estimating and accounting for organ dose resulting from imaging procedures. Monte-Carlo methods were used to calculate radiation dose to the patient resulting from a kV CBCT imaging scan based upon CT image data. A Python program was created to generate DVHs using the calculated 3D dose matrix and the DICOM-RT Structure Set for the patient. A number of head and pelvic CT scans were used in the study, and the resulting DVHs were analyzed to determine the variation of organ dose as a function of patient size. For the head scans in supine position, the average of the mean doses for some organs, along with the standard deviation in those mean doses, are as follows:Brainstem: 0.25cGy +/- 0.02cGyBrain: 0.26cGy +/- 0.01cGyOptic Chiasm: 0.22 +/- 0.03cGyBone: 0.55 +/- 0.04cGyAnterior Skin: 0.13 +/- 0.05cGyPosterior Skin: 0.23 +/- 0.06cGyEye: 0.11cGy +/- 0.05cGyFor Pelvic scans, dose to organs such as rectum, have likewise been shown to ...Continue Reading

Citations

Aug 8, 2013·Physics in Medicine and Biology·George X Ding, Arnold W Malcolm

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