低剂量CT肺部扫描患者剂量与图像质量研究

肺部低剂量CT扫描在肺癌筛查、肺炎和肺血管等肺部疾病诊断中，主要通过降低管电压、管电流等方式，在能够获取足够诊断信息的基础上，大幅降低了受检者辐射剂量。目前研究主要采用对临床受检者和拟人肺部模体进行扫描的方式，以医师主观方法对低剂量CT的图像质量进行评价，多数研究报道在大幅降低管电流的条件下，结合IMR算法的低剂量CT可达到主观满意的图像质量。虽然目前还没有公认的低剂量CT扫描参数，但随着公众对辐射防护重视度的提高和研究的深入，低剂量CT扫描在临床肺部疾病筛查和诊断中将会得到普及。

Study on patient dose and image quality of low-dose CT in lung scanning

Without affecting the acquisition of sufficient diagnostic information, low-dose CT scan can significantly reduce the radiation dose of patients in the screening of lung diseases, such as lung cancer, pneumonia, pulmonary vascular diseases, which mainly achieved by reducing tube voltage and tube current. At present, the main way of research is to scan the clinical subjects and anthropomorphic lung phantom, and then the doctors’ subjective judgment is used to evaluate the image quality of low-dose CT. Most studies had reported that the low dose CT combined with IMR algorithm can achieve subjectively satisfactory image quality under the condition of greatly reducing the tube current. Although there is no recognized scanning parameters, low-dose CT will be widely used in clinical screening and diagnosis of lung diseases with the rising awareness of radiation protection and in-depth research.