ArticleMedical physics2019
Organ doses from CT localizer radiographs: Development, validation, and application of a Monte Carlo estimation technique.
Article in Medical physics, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 19 citations in OpenAlex.
- Patient Centring in CT: An International Survey of Clinical Practice and Future Directions.Journal of medical radiation sciences · 2026Article
- Determining the scanning range of coronary computed tomography angiography based on deep learning.World journal of radiology · 2025Article
- Radiation dose proportions of localizer radiograph and bolus tracking in low-dose pediatric cardiothoracic computed tomography.Pediatric radiology · 2025Article
- Comparing organ and effective dose of various CT localizer acquisition strategies: A Monte Carlo study.Medical physics · 2025Article
- Evaluation of direct point dose estimation based on the distribution of the size-specific dose estimate.Physical and engineering sciences in medicine · 2024Article
- Surface-based anthropomorphic bone structures for use in high-resolution simulated medical imaging.Physics in medicine and biology · 2023Article
- Organ doses and cancer risk assessment in patients exposed to high doses from recurrent CT exams.European journal of radiology · 2022Article
- A scanner-specific framework for simulating CT images with tube current modulation.Physics in medicine and biology · 2021Article
- Comparison of 12 surrogates to characterize CT radiation risk across a clinical population.European radiology · 2021Article
- Machine learning for the prediction of pseudorealistic pediatric abdominal phantoms for radiation dose reconstruction.Journal of medical imaging (Bellingham, Wash.) · 2020Article
- A Preliminary Study of Personalized Head CT Scan in Pediatric Patients.Dose-response : a publication of International Hormesis SocietyArticle
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9 authors at 2 institutions in 1 country.
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Abstract
purposeThe purpose of this study was to simulate and validate organ doses from different computed tomography (CT) localizer radiograph geometries using Monte Carlo methods for a population of patients.
methodsA Monte Carlo method was developed to estimate organ doses from CT localizer radiographs using PENELOPE. The method was validated by comparing dosimetry estimates with measurements using an anthropomorphic phantom imbedded with thermoluminescent dosimeters (TLDs) scanned on a commercial CT system (Siemens SOMATOM Flash). The Monte Carlo simulation platform was then applied to conduct a population study with 57 adult computational phantoms (XCAT). In the population study, clinically relevant chest localizer protocols were simulated with the x-ray tube in anterior-posterior (AP), right lateral, and PA positions. Mean organ doses and associated standard deviations (in mGy) were then estimated for all simulations. The obtained organ doses were studied as a function of patient chest diameter. Organ doses for breast and lung were compared across different views and represented as a percentage of organ doses from rotational CT scans.
resultsThe validation study showed an agreement between the Monte Carlo and physical TLD measurements with a maximum percent difference of 15.5% and a mean difference of 3.5% across all organs. The XCAT population study showed that breast dose from AP localizers was the highest with a mean value of 0.24 mGy across patients, while the lung dose was relatively consistent across different localizer geometries. The organ dose estimates were found to vary across the patient population, partially explained by the changes in the patient chest diameter. The average effective dose was 0.18 mGy for AP, 0.09 mGy for lateral, and 0.08 mGy for PA localizer.
conclusionA platform to estimate organ doses in CT localizer scans using Monte Carlo methods was implemented and validated based on comparison with physical dose measurements. The simulation platform was applied to a virtual patient population, where the localizer organ doses were found to range within 0.4%-8.6% of corresponding organ doses for a typical CT scan, 0.2%-3.3% of organ doses for a CT pulmonary angiography scan, and 1.1%-20.8% of organ doses for a low-dose lung cancer screening scan.
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