ArticleRadiation oncology (London, England)2016
Evaluation of gantry speed on image quality and imaging dose for 4D cone-beam CT acquisition.
Article in Radiation oncology (London, England), 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.
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21 citing papers in PubMed, 35 citations in OpenAlex.
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- Using 4DCBCT simulation and guidance to evaluate inter-fractional tumor variance during SABR for lung tumor within the lower lobe.Scientific reports · 2021Article
- Technical Note: Comparison of the internal target volume (ITV) contours and dose calculations on 4DCT, average CBCT, and 4DCBCT imaging for lung stereotactic body radiation therapy (SBRT).Journal of applied clinical medical physics · 2020Article
- Estimation of effective imaging dose and excess absolute risk of secondary cancer incidence for four-dimensional cone-beam computed tomography acquisition.Journal of applied clinical medical physics · 2019Article
- Quantifying the accuracy of deformable image registration for cone-beam computed tomography with a physical phantom.Journal of applied clinical medical physics · 2019Article
- Daily edge deformation prediction using an unsupervised convolutional neural network model for low dose prior contour based total variation CBCT reconstruction (PCTV-CNN).Biomedical physics & engineering express · 2019Article
- Low dose cone-beam computed tomography reconstruction via hybrid prior contour based total variation regularization (hybrid-PCTV).Quantitative imaging in medicine and surgery · 2019Article
- Quantitative evaluation of 4D Cone beam CT scans with reduced scan time in lung cancer patients.Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology · 2019Article
- First clinical retrospective investigation of limited projection CBCT for lung tumor localization in patients receiving SBRT treatment.Physics in medicine and biology · 2019Article
- Evaluation and Clinical Application of a Commercially Available Iterative Reconstruction Algorithm for CBCT-Based IGRT.Technology in cancer research & treatment · 2019Article
- On the improvement of CBCT image quality for soft tissue-based SRS localization.Journal of applied clinical medical physics · 2018Article
- Low dose CBCT reconstruction via prior contour based total variation (PCTV) regularization: a feasibility study.Physics in medicine and biology · 2018Article
- Cone-beam CT reconstruction for non-periodic organ motion using time-ordered chain graph model.Radiation oncology (London, England) · 2017Article
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Authors and funding
9 authors at 3 institutions in 1 country.
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Abstract
backgroundThis study investigates the effect of gantry speed on 4DCBCT image quality and dose for the Varian On-Board Imager®.
methodsA thoracic 4DCBCT protocol was designed using a 125 kVp spectrum. Image quality parameters were evaluated for 4DCBCT acquisition using Catphan® phantom with real-time position management™ system for gantry speeds varying between 1.0 to 6.0°/s. Superior-inferior motion of the phantom was executed using a sinusoidal waveform with five second period. Scans were retrospectively sorted into 4 phases (CBCT-4 ph) and 10 phases (CBCT-10 ph); average 4DCBCT (CBCT-ave), using all image data from the 4DCBCT acquisitions was also evaluated. The 4DCBCT images were evaluated using the following image quality metrics: spatial resolution, contrast-to-noise ratio (CNR), and uniformity index (UI). Additionally, Hounsfield unit (HU) sensitivity compared to a baseline CBCT and percent differences and RMS errors (RMSE) of excursion were also determined. Imaging dose was evaluated using an IBA CC13 ion chamber placed within CIRS Thorax phantom using the same sinusoidal motion and image acquisition settings as mentioned above.
resultsSpatial resolution decreased linearly from 5.93 to 3.82 lp/cm as gantry speed increased from 1.0 to 6.0°/s. CNR decreased linearly from 4.80 to 1.82 with gantry speed increasing from 1.0 to 6.0°/s, respectively. No noteworthy variations in UI, HU sensitivity, or excursion metrics were observed with changes in gantry speed. Ion chamber dose rates measured ranged from 2.30 (lung) to 5.18 (bone) E-3 cGy/mAs.
conclusionsA quantitative analysis of the Varian OBI's 4DCBCT capabilities was explored. Changing gantry speed changes the number of projections used for reconstruction, affecting both image quality and imaging dose if x-ray tube current is held constant. From the results of this study, a gantry speed between 2 and 3°/s was optimal when considering image quality, dose, and reconstruction time. The future of 4DCBCT clinical utility relies on further investigation of image acquisition and reconstruction optimization.
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