Department of Diagnostic and Interventional Radiology, University Hospital Jena, Am Klinikum 1, Jena 07747, Germany.
Medical Physics Group, Department of Diagnostic and Interventional Radiology, University Hospital Jena, Philosophenweg 3, Jena 07743, Germany.
Radiat Prot Dosimetry. 2022 May 13;198(6):325-333. doi: 10.1093/rpd/ncac038.
Size-specific dose estimate ($\mathbf{SSDE}$) index appears to be more suitable than the commonly used volume computed tomography dose index ($\mathbf{C}{\mathbf{TDI}}{\mathbf{vol}}$) to estimate the dose delivered to the patient during a computed tomography (CT) scan. We evaluated whether an ${\mathbf{SSDE}}{\mathbf{BMI}}$ can be determined from the patient's body mass index ($\mathbf{BMI}$) with sufficient reliability in the case that a $\mathbf{SSDE}$ is not given by the CT scanner. For each of the three most used examination types, CT examinations of 50 female and 50 male patients were analyzed. The $\mathbf{SSDE}$ values automatically provided by the scanner were compared with ${\mathbf{SSDE}}{\mathbf{BMI}}$ determined from $\mathbf{C}{\mathbf{TDI}}{\mathbf{vol}}$ and $\mathbf{BMI}$. A good accordance of ${\mathbf{SSDE}}_{\mathbf{BMI}}$ and $\mathbf{SSDE}$ was found for the chest and abdominal regions. A low correlation was observed for the head region. The presented method is a simple and practically useful surrogate approach for the chest and abdominal regions but not for the head.
体积 CT 剂量指数（CTDIvol）常用于估计 CT 扫描时患者所接受的剂量，而基于体素的剂量估计（SSDE）指数似乎更适合。我们评估了在 CT 扫描仪未提供 SSDE 的情况下，能否根据患者的体重指数（BMI）可靠地确定 BMI 相关的 SSDE（SSDEBMI）。分析了三种最常用的检查类型中，各 50 名女性和 50 名男性患者的 CT 检查。将扫描仪自动提供的 SSDE 值与从 CTDIvol 和 BMI 确定的 SSDEBMI 进行比较。对于胸部和腹部区域，发现 SSDEBMI 与 SSDE 具有很好的一致性。而对于头部区域，相关性较低。该方法对于胸部和腹部区域是一种简单且实用的替代方法，但对于头部区域则不然。
