Accuracy of dose calculation based on artefact corrected Cone Beam CT images of lung cancer patients
نویسندگان
چکیده
منابع مشابه
Shading correction for cone-beam CT in radiotherapy: Validation of dose calculation accuracy using clinical images
Cone-beam CT (CBCT) images are routinely acquired to verify patient position in radiotherapy (RT), but are typically not calibrated in Hounsfield Units (HU) and feature non-uniformity due to X-ray scatter and detector persistence effects. This prevents direct use of CBCT for re-calculation of RT delivered dose. We previously developed a prior-image based correction method to restore HU values a...
متن کاملCorrection of megavoltage cone‐beam CT images of the pelvic region based on phantom measurements for dose calculation purposes
Megavoltage cone-beam CT (MVCBCT) is an imaging technology that provides a 3D representation of the patient in treatment position. Because it is a form of x-ray tomography, MVCBCT images give information about the attenuation coefficients of the imaged tissues, and thus could be used for dose calculation. However, the cupping and missing data artifacts seen on MVCBCT images can cause inaccuraci...
متن کاملDetection of lung cancer using CT images based on novel PSO clustering
Lung cancer is one of the most dangerous diseases that cause a large number of deaths. Early detection and analysis can be very helpful for successful treatment. Image segmentation plays a key role in the early detection and diagnosis of lung cancer. K-means algorithm and classic PSO clustering are the most common methods for segmentation that have poor outputs. In t...
متن کاملSU-E-T-520: Quantitative Evaluation of Metal Artifacts in CT and Cone-Beam CT Images on the Accuracy of Dose Calculation.
PURPOSE To investigate effects of metal artifacts on the dose calculation accuracy of three dose calculation algorithms on CT and cone-beam CT images. METHODS A phantom with and without metal objects was scanned using CT simulator and on-board kV CBCT. Conformal 5-field treatment plans with identical physical and dosimetric parameters were created in the Eclipse™ treatment planning system for...
متن کاملEvaluation of accuracy of 3D reconstruction images using multi-detector CT and cone-beam CT
PURPOSE This study was performed to determine the accuracy of linear measurements on three-dimensional (3D) images using multi-detector computed tomography (MDCT) and cone-beam computed tomography (CBCT). MATERIALS AND METHODS MDCT and CBCT were performed using 24 dry skulls. Twenty-one measurements were taken on the dry skulls using digital caliper. Both types of CT data were imported into O...
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ژورنال
عنوان ژورنال: Physics and Imaging in Radiation Oncology
سال: 2017
ISSN: 2405-6316
DOI: 10.1016/j.phro.2016.11.001