Research Investigation Of Patient Radiation Dose In CT Examination Based On Information Technology

Object: A method of automatic monitoring patient radiation dose during CT scanningwas investigated with information techniques. Using this method, a survey of CT radiationdose from a region or a period time could be done. Compared with diagnostic referencelevels (DRL) provided by newly issued national standard, which kinds of CT examinationhave high dose are easily observable and which scanning protocols need to be improvedcan be found. A strategic decision of CT radiation controlling would be acquired.Method: CTDIwof5CT equipments was verified by dosimeter measurement. Theradiation parameter means has been explained. Applied with radiation dose structurereports (RDSR) defined with DICOM standard, an analysis of CT radiation dose has beenconducted.1260radiation dose information were auto retrieved from PACS with selfdesigned software. Dose parameters combined with scanning region were extracted tocreate patient radiation dose databases. According to age, patients were divided into adultand pediatric groups. Mean CTDIvoland DLP value were calculated respectively andeffective dose were estimated.75thDLP value was also computed to compare withDiagnostic reference level (DRL).Result: The measured CTDIwof5CT equipment was on the same level. CTDIwof headscanning was as same as DRL, while spine and abdominal scanning were lower than DRL.To adults, DLP of cerebrovascular enhanced scanning and effective dose of abdominalenhanced scanning was highest. To pediatric patients, there was no significant difference inDLP among different ages. Conclusion: Applying PACS is an efficient and simple method to acquire patient radiationdose. It is found that CTDI only reflects the dose contribution from a slice, but do notreflect the cumulative dose. For the patients need multiphase scanning, such as abdominalenhanced scanning, because they may be exposed to high dose, national standard shouldprovide DLP value as the diagnostic reference level. Using individual scanning protocol isan effective method to reduce radiation dose of pediatric.