Survey of CT radiation dose to 1200 cancer patients
10.3760/cma.j.issn.1673-422X.2014.04.019
- VernacularTitle:1200例肿瘤患者CT检查辐射剂量的调查研究
- Author:
Shuli LI
;
Qing LI
;
Yi ZHANG
;
Cheng LIU
;
Lin ZHANG
- Publication Type:Journal Article
- Keywords:
Tomography,X-ray computed;
Radiation dosage;
Radiation protection
- From:
Journal of International Oncology
2014;41(4):302-305
- CountryChina
- Language:Chinese
-
Abstract:
Objective To survey the CT radiation dose to cancer patients,and to compare it with diagnostic reference level (DRL) provided by newly issued national standard.Methods Computed tomography dose index weighted (CTDIw) of 5 CT equipments was measured by the standard phantom with typical scanning protocol and radiation dose parameters including average computed tomography dose index volume (CTDIvol),dose length product (DLP),75％ DLP with 900 adult and 300 pediatric cancer patients were collected.According to age stage,effective dose was estimated.Results The measured CTDIw for head scanning was on the same level with DRL,while lumbar vertebra and abdominal scanning were lower than DRL.To adults,DLP of cerebrovascular enhanced scanning and effective dose of abdominal enhanced scanning were the highest.To pediatric patients,there was no significant difference in DLP among different ages.Conclusion CTDI only reflects the dose contribution from a slice,but do not reflect the cumulative dose.For the patients need multiphase scanning,because they may be exposed to high dose,national standard should provide DLP value as the diagnostic reference level.Using individual scanning protocol is an effective method to reduce radiation dose of pediatric patient.
