Simplified size adjusted dose reference levels for adult CT examinations: A regional study
Abstract
Purpose To investigate retrospective classification of adult patients into small, average, and large based on effective diameter (EDia) from localizer image of computed tomography (CT) scans and to develop regional diagnostic reference levels (DRLs) and achievable doses (AD).Method The patients falling within the mean ± standard deviation (SD) of EDia were classified as average; those below this range as small and above as large. The CTDI vol,dose-length-product (DLP) and size-specific dose estimates (SSDE) of all adult patients undergoing CT examinations in 8 CT facilities for 11 months (Dec. 2019 - Oct. 2020) were evaluated. The 75th and 50th percentile values were compared with national and international values.Results Of the total of 69,434 CT examinations, nearly 80% fell within average size. The 75th percentile values of CTDI vol and DLP for small patients for abdomen-pelvic exams were nearly half of average sized patients. Similarly, the 75th percentile values for large patients were nearly double. Similar findings were not found for chest exams. Analysis of image quality and dose factors such as noise, mean axial length, slice thickness, mean number of sequences, use of iterative reconstruction and tube current modulation (TCM) resulted in identification of opportunities for improvement and optimization of different CT facilities.Conclusions DRLs for adult patients were found to vary widely with patient size and thus establishing DRLs only for standard sized patient is not adequate. Simplified and intuitive methods for size classification was shown to provide meaningful information for optimization for patients outside the standard size adult.
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In CT, the predominant DRL metrics are CTDIvol (mGy) and DLP (mGy·cm).
“In CT, the two primary metrics recommended for DRLs are the volume-weighted computed tomography dose index (CTDIvol) and the dose-length product (DLP).85”
From Computed Tomography Diagnostic Reference Levels Worldwide and in Jordan: Implications for Patient Dose Reduction (2026) · cites this paper as [85]
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Relationships of radiation dose indices with body size indices in adult body computed tomography
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“85 These parameters constitute the foundation of national and international dose audits owing to their practicality, repeatability, and accessibility from practically all contemporary CT scanners.”
- Authors
- Moghadam, N., Lecomte, R., Mercure, S., Rehani, M. M., & Nassiri, M. A.
- Affiliations
- Centre Hospitalier Universitaire de Sherbrooke (CA)
- Université de Sherbrooke (CA)
- Massachusetts General Hospital (US)
- Corresponding author
- Moghadam, Narjes
- Venue
- European Journal of Radiology
- Publisher
- Elsevier BV
- Published
- 2021-09
- Volume
- 142
- Pages
- 109861
- ISSN
- 0720-048X (ISSN-L)
- OpenAlex
- W3181651327
- Cited by
- 16
- References
- 42
- Citations by year
- 2026: 5 · 2024: 3 · 2023: 4 · 2022: 4
- FWCI
- 1.45
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- European Journal of Radiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Radiation Dose and Imaging
- Physical Sciences › Physics and Astronomy › Radiation › Advanced Radiotherapy Techniques
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Digital Radiography and Breast Imaging
- Keywords
- diagnostic reference levels, effective diameter, size-specific dose estimate, dose-length product, CT radiation dose, abdominal and pelvic CT, chest CT, iterative reconstruction, tube current modulation, dose optimization, image quality
- MeSH terms
- Abdomen, Adult, Humans, Radiation Dosage, Reference Values, Retrospective Studies, Tomography, X-Ray Computed
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