- 作者：Martin Law ; lawwm@ha.org.hk" class="auth_mail" title="E-mail the corresponding author ; Wang-Kei Ma ; Damian Lau ; Eva Chan ; Lawrance Yip ; Wendy Lam
- 关键词：Full spine scoliosis radiography ; Cumulative effective dose ; Cumulative cancer risk
- 刊名：European Journal of Radiology
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：85
- 期：3
- 页码：625-628
- 全文大小：462 K
Methods
Organ absorbed doses of full spine exposed scoliotic patients at different age were computer simulated with the use of PCXMC software. Gender specific effective dose was then calculated with the ICRP-103 approach. Values of lifetime attributable cancer risk for patients exposed at different age were calculated for both patient genders and for Asian and Western population. Mathematical fitting for effective dose and for lifetime attributable cancer risk, as function of exposed age, was analytically obtained to quantitatively estimate patient cumulated effective dose and cancer risk.
Results
The cumulative effective dose of full spine radiography with posteroanterior and lateral projection for patients exposed annually at age between 5 and 30 years using digital radiography system was calculated as 15 mSv. The corresponding cumulative lifetime attributable cancer risk for Asian and Western population was calculated as 0.08–0.17%. Female scoliotic patients would be at a statistically significant higher cumulated cancer risk than male patients under the same full spine radiography protocol.
Conclusion
We demonstrate the use of computer simulation and analytic formula to quantitatively obtain the cumulated effective dose and cancer risk at any age of exposure, both of which are valuable information to medical personnel and patients’ parents concern about radiation safety in repetitive full spine radiography.