Radiat Prot Dosimetry. 2021 Dec 30;197(3-4):135-145. doi: 10.1093/rpd/ncab171.
We assessed variations in chest CT usage, radiation dose and image quality in COVID-19 pneumonia. Our study included all chest CT exams performed in 533 patients from 6 healthcare sites from Brazil. We recorded patients' age, gender and body weight and the information number of CT exams per patient, scan parameters and radiation doses (volume CT dose index-CTDIvol and dose length product-DLP). Six radiologists assessed all chest CT exams for the type of pulmonary findings and classified CT appearance of COVID-19 pneumonia as typical, indeterminate, atypical or negative. In addition, each CT was assessed for diagnostic quality (optimal or suboptimal) and presence of artefacts. Artefacts were frequent (367/841), often related to respiratory motion (344/367 chest CT exams with artefacts) and resulted in suboptimal evaluation in mid-to-lower lungs (176/344) or the entire lung (31/344). There were substantial differences in CT usage, patient weight, CTDIvol and DLP across the participating sites.
我们评估了 COVID-19 肺炎患者中胸部 CT 检查的使用情况、辐射剂量和图像质量的变化。我们的研究包括来自巴西 6 个医疗中心的 533 名患者的所有胸部 CT 检查。我们记录了患者的年龄、性别和体重，以及每位患者的 CT 检查次数、扫描参数和辐射剂量（容积 CT 剂量指数-CTDIvol 和剂量长度乘积-DLP）。6 名放射科医生对所有胸部 CT 检查进行了肺部病变类型评估，并将 COVID-19 肺炎的 CT 表现分类为典型、不确定、非典型或阴性。此外，每例 CT 均评估了诊断质量（最佳或次佳）和伪影的存在。伪影很常见（367/841），常与呼吸运动有关（344/367 例有伪影的胸部 CT 检查），导致中下肺（176/344）或整个肺（31/344）评估不佳。参与的各个站点之间的 CT 使用情况、患者体重、CTDIvol 和 DLP 存在很大差异。
