268例雙源CT冠狀動脈CTA成像的輻射劑量水平研究

Study of the radiation dose levels of dual-source ct coronary artery CTA imaging in 268 cases

目的瞭解雙源CT冠狀動脈CTA成像的輻射劑量水平及其主要影響因素,探討相應改善空間與措施。方法對2013年6月~12月在本院冠狀動脈CTA成像檢查的268例病人的輻射劑量及相關掃描參數進行記錄、統計、分析。結果冠狀動脈CTA的X射線劑量CTDIVol 13.09±5.05mGy(中位值10.73 mGy),DLP 201.66±82.26 mGy.cm(中位值168mGy.cm),X射線有效吸收劑量ED 3.43±1.4mSv(中位值2.85mSv)。X射線輻射劑量與體重指數存在顯著正相關性,與心率存在一定負相關性,與心律不齊也密切相關。結論目前本院冠狀動脈CTA的X射線輻射劑量已基本控製在可接受的較低水平,通過掌握相關適應症及調整相關參數,可避免接受不必要的較大劑量輻射劑量的可能。

Objective To explore the radiation dose levels for dual-source CT coronary artery CTA imaging.Methods Radiation dose data of dual-source CT coronary artery CTA imaging of 268 patients from June to December 2013 in Macao Kiang Wu Hospital were studied.Results The X-ray doses of dual-source CT coronary artery CTA:CTDIVol is about 13.09±5.05mGy(median 10.73 mGy),DLP is about 201.66±82.26 mGy.cm(median 168mGy.cm)and effective dose(ED)is about 3.43±1.4mSv(median 2.85mSv).Radiation dose has a strong positive relation to BMI,negative relation to heart rate and arrhythmia.Conclusion The X-ray radiation dose for dual-source CT coronary artery CTA imaging at Macao Kiang Wu Hospital has been controlled to acceptable low level.By mastering the relevant indications and adjustment of parameters unnecessary high radiation dose can be avoided.