Premium
SU‐E‐T‐16: A Feasibility Investigation: Radiotherapy Dose Calculation On KV Cone‐Beam CT Image for Lung Tumor
Author(s) -
Ma C
Publication year - 2013
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.4814450
Subject(s) - hounsfield scale , imaging phantom , cone beam computed tomography , nuclear medicine , cone beam ct , dosimetry , medicine , image guided radiation therapy , radiation treatment planning , calibration , medical imaging , radiation therapy , computed tomography , radiology , mathematics , statistics
Purpose: To eveluate the performance of the KV CBCT image data used for dose calculation with precise calibration of Hounsfield units(HU)to electron density(HU‐density). Methods: The CBCT calibration was analysed with different field angle in this study. A clinical treatment planning system was employed for plan CT and KV CBCT image to dose calculations and subsequent comparisons. Two HU‐density tables generated using the Computerized Imaging Reference Systems(CIRS) phantom. By performing dose comparision between CT and CBCT image‐based plans. Results: The results showed that a max of about 4% dose discrepancy was observed for inserts.The sigle field isodose curves were very close and less discrepant. The lung clinical patient study indicated that the volume of lung tumor achieved the prescribed dose in CBCT was lower than the CT plan. Conclusion: Our study showed that the dosimetric accuracy of CBCT‐based dose calculation for lung tumor is acceptable only for the purpose of dosimetric checks with calibration applied. KV CBCT images can not replace the traditional CT images for accuracy dose calculation.