PATIENT-SPECIFIC ORGAN DOSES FROM PEDIATRIC HEAD CT EXAMINATIONS
| Autor: | V F Cassola, William Jaramillo Garzón, D F A Aldana |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Adolescent
Computed tomography Radiation Dosage Imaging phantom 030218 nuclear medicine & medical imaging Red bone marrow 03 medical and health sciences 0302 clinical medicine Conversion coefficients Medicine Humans Radiology Nuclear Medicine and imaging Child Radiometry Radiation Radiological and Ultrasound Technology medicine.diagnostic_test business.industry Phantoms Imaging Public Health Environmental and Occupational Health Infant Newborn Infant General Medicine Patient specific Clinical routine 030220 oncology & carcinogenesis Absorbed dose Child Preschool business Nuclear medicine Tomography X-Ray Computed Head Monte Carlo Method |
| Zdroj: | Radiation protection dosimetry. 191(1) |
| ISSN: | 1742-3406 |
| Popis: | The aim of this work was to estimate patient’s organ absorbed doses from pediatric helical head computed tomography (CT) examinations using the Size-Specific Dose Estimate (SSDE) methodology and to determine organ dose to SSDE conversion coefficients for clinical routine. Patient-specific organ and tissue absorbed doses from 139 Head CT scans performed in pediatric patients from 0 to 15 years old in a Public Hospital in Tunja, Colombia were estimated. The calculations were made through Monte Carlo simulations, based on patient-specific information, dosimetric CT quantities (CTDIvol, DLP) and age-specific computational human phantoms matched to patients on the basis of gender and size. SSDE showed to be a good quantity for estimate patient-specific organ doses from pediatric head CT examinations when appropriate phantom’s attenuation-based size metrics are chosen to match for any patient size. Strong correlations between absorbed dose and SSDE were found for skin (R2 = 0.99), brain (R2 = 0.98) and eyes (R2 = 0.97), respectively. Besides, a good correlation between SSDE and absorbed dose to the red bone marrow (tissue extended outside the scan coverage) was observed (R2 = 0.94). SSDE-to-organ-dose conversion coefficients obtained in this study provide a practical way to estimate patient-specific organ head CT doses. |
| Databáze: | OpenAIRE |
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