ArticleZeitschrift fur medizinische Physik2024
Imaging doses for different CBCT protocols on the Halcyon 3.0 linear accelerator - TLD measurements in an anthropomorphic phantom.
Article in Zeitschrift fur medizinische Physik, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 10 citations in OpenAlex.
- First dosimetric evaluation of deformable dose accumulation in human individuals.Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al] · 2026Article
- Patient doses in image-guided radiotherapy: status in Europe for cone-beam CT imaging in the pelvic region.Radiology and oncology · 2026Article
- Comparison of Low-Dose, Standard-Dose, and High-Definition CBCT Protocols for STL Reconstruction Accuracy in Digital Bone Scaffold Workflows.International journal of dentistry · 2026Article
- From standard to stratified: Modeling NTCP and EAR to personalize daily MV-CBCT in radiotherapy.Journal of applied clinical medical physics · 2025Article
- Development of a patient-specific cone-beam computed tomography dose optimization model using machine learning in image-guided radiation therapy.Radiological physics and technology · 2025Article
- Enhancing patient positioning accuracy: evaluating daily cone beam computed tomography in the halcyon system.Japanese journal of clinical oncology · 2025Article
- Investigation of the beam width and profile of kilovoltage CBCT using different measurement techniques and analysis of the dosimetric effects of beam parameters.Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology · 2025Article
- Feasibility of Radiophotoluminescent Glass Dosimeter for Measuring Radiation Dose in Kilovoltage Cone-beam Computed Tomography.Journal of medical physicsArticle
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Authors and funding
9 authors at 1 institution in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
introductionImage guided radiotherapy allows for particularly conformal tumour irradiation through precise patient positioning. Becoming the standard for radiotherapy, this increases imaging doses to the patient. The Halcyon 3.0 linear accelerator (Varian Medical Systems, Palo Alto, CA) requires daily imaging due to its geometry. For this reason, the accelerator is equipped with on-line kV and MV imaging. However, daily CBCT images required for irradiation apply additional radiation, which increases the dose to normal tissue and therefore can affect the patient's secondary cancer risk. In this study, actual organ doses were measured for the kV system, and a comparison of normal tissue doses for all available kV CBCT protocols was presented to demonstrate differences in imaging doses across entities and protocols. In addition, effective dose and secondary cancer risk from imaging are evaluated. MATERIAL AND
methodsMeasurements were performed with thermoluminescent dosimeters in an anthropomorphic phantom positioned according to each entity (brain, head and neck, breast, lung, pelvis). CBCT images were obtained, using all available pre-set protocols without further adjustment of the parameters. Measured doses for each position and each protocol were then compared and secondary cancer risk of relevant and specifically radiosensitive organs was calculated.
resultsIt was found that imaging doses for protocols such as Pelvis and Head could be reduced by up to half using the corresponding Fast and Low Dose modes, respectively. On the other hand, larger field sizes or the Large mode yielded higher doses than their initial protocols. Image Gently was found to spare normal tissue best, however it is not suitable for certain entities due to low image quality or insufficient projection data. DISCUSSION: By using appropriate kV-CBCT protocols, it is possible to reduce imaging doses to a significant extent and therefore spare healthy tissue. Combined with studies of image quality, the results of this study could lead to adjustments in workflow regarding the choice of protocols used in daily routine. This could prevent unnecessary radiation exposure and reduce secondary cancer risk.
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