几种降低锥束CT辐射剂量的方法

Several Methods for Reducing the Dose of Cone Beam CT

千伏级锥束CT在放射治疗、外科手术、口腔疾病诊断等领域都有广泛的应用。然而,频繁地使用千伏级锥束CT,也会给患者甚至医生带来额外的射线辐射损伤。相关统计结果表明,X射线辐射能够诱发癌症,特别是儿童和女性对射线辐射异常敏感。因此,合理使用锥束CT,同时降低锥束CT辐射剂量,对于降低射线辐射并发症风险显得非常重要。本文总结了降低锥束CT辐射剂量的常用措施,包括降低管电流、局部扫描、脉冲扫描、短扫描以及少投影扫描。辐射剂量的降低有可能会在重建图像中引入噪声、伪影。针对特定的问题,本文也提出了对应的补偿方法。

Kilovoltage cone beam CT has been widely used in radiotherapy, surgical operation and dental diagnosis. However, frequent use of kilovoltage cone beam CT will deliver extra radiation damage to patients, even doctors. Associated statistical results show that most cancers can be induced by X-ray radiation. Meanwhile children and women are especially sensitive to radiation. So reasonable use of cone beam CT and limiting the radiation dose of cone beam CT are very important to reduce the risk of disease induced by radiation. This paper summarizes some techniques of reducing radiation dose of cone beam CT, including lower current, local scan, pulse scan, short scan and view reduced scan. Dose reduction may cause noise or artifacts in image domain. To specific issue, corresponding correcting methods are also proposed in this paper.