Radiation dose and cancer risk from pediatric CT examinations on 64-slice CT: A phantom study
| Autor: | Pek-Lan Khong, Martin Law, Shi Ting Feng, Quan Fei Meng, Bingsheng Huang, Sherry Ng, Zi Ping Li |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Male
Thorax China medicine.medical_specialty Neoplasms Radiation-Induced Radiation Dosage Risk Assessment Whole-Body Counting Imaging phantom Risk Factors Humans Medicine Radiology Nuclear Medicine and imaging Pelvis Lung Phantoms Imaging business.industry Incidence Thyroid Cancer General Medicine medicine.disease medicine.anatomical_structure Child Preschool Abdomen Female Tomography Radiology Tomography X-Ray Computed business Nuclear medicine |
| Zdroj: | European Journal of Radiology. 76:e19-e23 |
| ISSN: | 0720-048X |
| DOI: | 10.1016/j.ejrad.2010.03.005 |
| Popis: | Objective: To measure the radiation dose from CT scans in an anthropomorphic phantom using a 64-slice MDCT, and to estimate the associated cancer risk. Materials and methods: Organ doses were measured with a 5-year-old phantom and thermoluminescent dosimeters. Four protocols; head CT, thorax CT, abdomen CT and pelvis CT were studied. Cancer risks, in the form of lifetime attributable risk (LAR) of cancer incidence, were estimated by linear extrapolation using the organ radiation doses and the LAR data. Results: The effective doses for head, thorax, abdomen and pelvis CT, were 0.7 mSv, 3.5 mSv, 3.0 mSv, 1.3 mSv respectively. The organs with the highest dose were; for head CT, salivary gland (22.33 mGy); for thorax CT, breast (7.89 mGy); for abdomen CT, colon (6.62 mGy); for pelvis CT, bladder (4.28 mGy). The corresponding LARs for boys and girls were 0.015–0.053% and 0.034–0.155% respectively. The organs with highest LARs were; for head CT, thyroid gland (0.003% for boys, 0.015% for girls); for thorax CT, lung for boys (0.014%) and breast for girls (0.069%); for abdomen CT, colon for boys (0.017%) and lung for girls (0.016%); for pelvis CT, bladder for both boys and girls (0.008%). Conclusion: The effective doses from these common pediatric CT examinations ranged from 0.7 mSv to 3.5 mSv and the associated lifetime cancer risks were found to be up to 0.16%, with some organs of higher radiosensitivity including breast, thyroid gland, colon and lungs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect