ArticleTranslational cancer research2020
Geometric accuracy evaluation of a six-degree-of-freedom (6-DoF) couch with cone beam computed tomography (CBCT) using a phantom and correlation study of the position errors in pelvic tumor radiotherapy.
Article in Translational cancer research, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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6 citing papers in PubMed.
- Dosimetric intercomparison for stereotactic radiotherapy of multiple brain metastases.Physics and imaging in radiation oncology · 2026Article
- Recent Advances and Current Challenges in Stereotactic Body Radiotherapy for Ultra-Central Lung Tumors.Cancers · 2024Review
- Evaluation of positioning accuracy in head-and-neck cancer treatment: A cone beam computed tomography assessment of three immobilization devices with volumetric modulated arc therapy.Journal of biological methods · 2024Article
- An empirical approach to the definition of the target margins in eye radiosurgery.Journal of applied clinical medical physics · 2023Article
- Clinical Analysis of Rotational-Translational Error Coupling in 3DoF Versus 6DoF CBCT Couch Corrections:A Cross-Sectional Study.Technology in cancer research & treatmentArticle
- Effectiveness of 6D couch with daily cone beam computed tomography in reducing PTV margins for glioblastoma multiforme.Journal of neurosciences in rural practiceArticle
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Abstract
backgroundTo assess the position accuracy of the six-degree-of-freedom (6-DoF) couch based on cone beam computed tomography (CBCT) and exploit the correlation of the six degrees errors.
methodsCT scans of an anthropomorphic phantom and patients were obtained at 3 mm slice thicknesses using a Philips scanner at the head, first supine and prostrate positions. An Eclipse Treatment Planning System was used to create a treatment plan. Different levels of known position errors were introduced to simulate patient position status for the anthropomorphic phantom. CBCT datasets for each position were acquired and registered to original CT datasets to evaluate the accuracy of the 6-DoF couch and determine the setup errors of patients. The setup errors of 200 CBCT datasets from 14 patients with pelvic tumors were analyzed. The correlations between six degrees position errors were finally extracted.
resultsFor the phantom study, the difference between known introduced errors and the setup errors were almost negligible. The deviation (mean ± one standard deviation) in registration methods were (0.01±0.02) cm, (0.04±0.075) cm, (0.02±0.004) cm, (0.01±0.04)°, (0.1±0.08)°, (0.03±0.05)° and (0.01±0.01) cm, (0.03±0.007) cm, (0.01±0.01) cm, (0.05±0.06)°, (0.08±0.08)°, (0.04±0.05)° for supine and prone position, respectively. The deviation in positions were (0.07±0.10) cm, (0.16±0.02) cm, (0.08±0.06) cm, (0.54±0.46)°, (0.24±0.16)°, (0.09±0.09)° and (0.06±0.09) cm, (0.19±0.09) cm, (0.09±0.07) cm, (0.49±0.49)°, (0.16±0.08)°, (0.1±0.13)° for bone and soft tissue registration methods, respectively. For patient data, the setup errors were (-0.07±0.22) cm, (0.14±0.35) cm, (-0.12±0.4) cm, (0.79±1.6)°, (0.41±0.71)°, (-0.03±0.8)° for supine position and (0.16±0.27) cm, (0.19±0.48) cm, (-0.05±0.34) cm, (1.1±1.49)°, (0.65±1.00)°, (-0.23±0.75)° for prone position, respectively. There is a significant moderate correlation between the longitudinal and pitch directions and between the vertical and pitch directions when the patient is in the supine position.
conclusionsThe six-dimensional couch positioning verification system based on CBCT has high accuracy and can meet the requirements of precise radiotherapy for pelvic tumors. There is a certain correlation between translation direction and rotation direction.
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