Determination of the Radiation Dose Level in Different Slice Computerized Tomography

Öz

Today, many imaging tools have emerged in the medical field using ionizing radiation. Computed tomography (CT) is regarded the most creative and  common modality among the other imaging devices. In CT imaging, radiation may scatter to the environment from the patient and the interaction medium. In this study, two CT scanners with  different slice numbers were used to measure the scatter radiation dose to the environment. Alderson rando phantom was utilized in the acquired CT exams as human body simulation. Radiation dose levels at different distances were determined by placing thermoluminescence dosimeters in the surrounding environment (at different distances) during phantom’s head-neck and thorax CT imaging. As a result, it has been found that the radiation dose varies between 13.90±1.96 µSv and 96.79±11.12 µSv in head and neck CT imaging. While, in thorax CT scan,  the radiation dose varies between 5.28±0.84 µSv and 20.63±1.76 µSv.

Anahtar Kelimeler

• CT,Radiation Dose,TLD,X ray

Kaynakça

1. Health risks from exposure to low levels of ionizing radiationBEIR VII. Washington DC: National Academies Press, 2005.
2. Mitelman F, Johansson B, Mertens FE. Mitelman database of chromosome aberrations in cancer. Cancer Genome Anatomy Project, 2007.
3. Hall EJ, Brenner DJ. Cancer risks from diagnostic radiology. Br J Radiol.2008 May;81(965):362-78.
4. Berrington de Gonzalez A, Mahesh M, Kim KP, Bhargavan M, Lewis R, Mettler F, Land C. Projected cancer risks from computed tomographic scans performed in the United States in 2007. Arch Intern Med. 2009 Dec 14;169(22):2071-7.
5. What’s NEXT? Nationwide Evaluation of X-ray Trends: 2000 computed tomography. (CRCPD publication no. NEXT_2000CTT.) Conference of Radiation Control Program Directors, Department of Health and Human Services, 2006
6. Mettler FA Jr, Wiest PW, Locken JA, Kelsey CA. CT scanning: patterns of use and dose. J Radiol Prot 2000;20:353-9.
7. White KS. Helical/spiral CT scanning: a pediatric radiology perspective. Pediatr Radiol 1996;26:5-14.
8. Linton OW, Mettler FA Jr. National conference on dose reduction in CT, with an emphasis on pediatric patients. AJR Am J Roentgenol 2003;181:321-9.

9. Brenner DJ, Elliston CD. Estimated radiation risks potentially associated with full-body CT screening. Radiology 2004; 232:735-8.
10. McNitt-Gray MF. AAPM/RSNA physics tutorial for residents topics in CT: radiation dose in CT. Radiographics 2002; 22:1541-53.
11. Günay, O., Abamor, E. Environmental radiation dose rate arising from patients of PET/CT. International Journal of Environmental Science and Technology, 1-8. (2018).
12. V.Every, R.J. Petty. Measurements of computed tomography radiation scatter. Australas Phys.Eng. Sci. Med.1992, 15(1) pp.15-24.
13. Palacı, H., Günay, O., Yarar, O. Türkiye’deki Radyasyon Güvenliği ve Koruma Eğitiminin Değerlendirilmesi. Avrupa Bilim ve Teknoloji Dergisi, (14), (2014), 249-254.
14. Stoeckelhuber BM, Leibecke T, Schulz E, et al. (2005). Radiation dose to the radiologist’s hand during continuous CT fluoroscopy-guided interventions. Cardiovasc Intervent Radiol. 28: pp. 589–594.
15. Kuru, L. İ., Gunay, O., Palacı, H., & Yarar, O. Bilgisayarlı tomografilerde hastanın aldığı efektif radyasyon dozunun belirlenmesi. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 21(1), (2019), 436-443.
16. M.Salvado et.al.,(2005). Monte Carlo calculation of radiation dose in CT examinations using phantom and patient tomographic models. Radiation Protection Dosimetry. 114(1-3):364-8.
17. D.Richard et.al.,.Patient and Personnel Exposure during CT Fluoroscopy-guided Interventional Procedures. RSNA Radiology V. 2000, 216 (1).
18. [18]Tekin H.O., Manici T. and Ekmekci C. "Investigation of backscattered dose in a computerized tomography (CT) facility during abdominal CT scan by considering clinical measurements and application of Monte Carlo method." Journal of Health Science 4 (2016): 131-134.
19. Tekin H. O., Cavlı, B., Altunsoy, E. E., Manici, T., Ozturk, C., and Karakas, H. Ml. "An investigation on radiation protection and shielding properties of 16 slice computed tomography (CT) facilities." International Journal of Computational and Experimental Science and Engineering 4.2 (2018): 37-40.