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- W2000261929 abstract "Purpose: In order to use linac Cone‐Beam‐CT (CBCT) data for dosimetric planning an electron density calibration is compulsory. Studies on available phantoms for CT performance checks/QA have shown that these are not sufficient for an adequate HU calibration. Therefore we designed a new dedicated phantom and carried out a planning study to determine the usability of such calibrated CBCT data in comparison with diagnostic CT data. Methods: Available linacCBCT options acquire in a single gantry rotation a volumetric CT data set. In order to 3D‐calibrate the system with regard to HU a special phantom has been designed to include the whole imager area. Removable inserts allow flexible positioning of the probes in x‐z as well as z‐direction. Furthermore a performance and image QA part according AAPM recommendations No. 1 has been integrated and evaluated. We compared 20 plan setups (10 in the pelvic and 10 in the thoracic region). Results: Within the field of view the HU variation is up to 5%. Towards the imager edges hounsfield units show small deviations relative to the imager center (max. 8%). Relative dose distributions in CBCT‐based plans show minor differences to plans calculated using a diagnostic CTimage dataset (p=0.002) and absolute dosage deviations are within 1% (p=0.001). Image quality comparisons using the performance and image QA part showed that CBCTimages are of lower quality than diagnostic images, i.e. spatial and low contrast resolution are 2–3 levels below. Conclusions: The newly designed phantom allows real 3D‐calibration of linacCBCT. It is made of water equivalent material and consists of probes with tissue equivalent materials. The phantom has additional scatter material to simulate a real patients' situation. CBCT data can be used for treatment planning. Furthermore the image QA part allows to carry out recommended constancy checks in straightforward approach. We received financial support from Varian Medical Systems to manufacture the prototypes." @default.
- W2000261929 created "2016-06-24" @default.
- W2000261929 creator A5078826401 @default.
- W2000261929 date "2011-06-01" @default.
- W2000261929 modified "2023-09-25" @default.
- W2000261929 title "SU-E-T-187: A Dedicated Phantom for Electron Density Calibration and Image QA of Linac Cone Beam CT Options" @default.
- W2000261929 doi "https://doi.org/10.1118/1.3612137" @default.
- W2000261929 hasPublicationYear "2011" @default.
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