Egeresi Lilla Szatmáriné, Urbán László, Dankó Zsolt, Balázs Ervin, Berényi Ervin, Marosi Mária, Kiss János, Bágyi Péter, Képes Zita, Emri Miklós, Balkay László
Division of Radiology and Imaging Science, Department of Medical Imaging, Faculty of Medicine, University of Debrecen, Nagyerdei St. 98, H-4032 Debrecen, Hungary.
Doctoral School of Molecular Medicine, Nagyerdei St. 98, H-4032 Debrecen, Hungary.
Diagnostics (Basel). 2025 Jun 28;15(13):1654. doi: 10.3390/diagnostics15131654.
: We assessed the frequency and causes of discrepancies in CT dose indices such as dose-length product (DLP), size-specific dose estimate (SSDE), and effective dose (ED), as calculated by CT dose-monitoring systems. Our secondary aim was to demonstrate the estimation of size-specific ED (SED) from the patients' dose records. : The retrospective study included dosimetric data of 79,383 consecutive CT exams performed on two CT scanners. The following dose values were recorded from both the locally developed dose-monitoring system (DMS) and a commercial dose-monitoring program (DW): DLP, SSDE, and ED. Only the DMS provided bodyweight-corrected effective dose (SED) and the SED based on previous published data. : Without body-region-specific analysis, there were no tendentious differences between the DLP, ED, or SSDE values obtained from DW and DMS. However, the body region-based correlation revealed substantial differences between ED and ED, primarily related to inadequate identification of the body. SSDE showed strong correlation to each anatomical category and CT device, except for the head region, where inadequate consideration of CT inclination was the reason for the biased SSDE value. Furthermore, by analyzing the SED, SSDE, and SED correlations, we concluded that SED is a promising figure for estimating the SED value. : SED provides suitable supplementary size-specific dose data to SDDE and may be a preferable choice for estimating cumulative doses in routine radiological practice.
我们评估了CT剂量监测系统计算得出的剂量长度乘积（DLP）、体型特异性剂量估计值（SSDE）和有效剂量（ED）等CT剂量指标差异的频率及原因。我们的次要目的是根据患者的剂量记录来演示体型特异性有效剂量（SED）的估算。
这项回顾性研究纳入了在两台CT扫描仪上连续进行的79383例CT检查的剂量学数据。从本地开发的剂量监测系统（DMS）和一个商业剂量监测程序（DW）中记录了以下剂量值：DLP、SSDE和ED。只有DMS提供了体重校正有效剂量（SED）以及基于先前发表数据的SED。
在未进行身体部位特异性分析的情况下，从DW和DMS获得的DLP、ED或SSDE值之间没有倾向性差异。然而，基于身体部位的相关性显示，ED和SED之间存在显著差异，主要与身体识别不充分有关。除头部区域外，SSDE与每个解剖类别和CT设备都显示出很强的相关性，在头部区域，对CT倾斜度考虑不足是导致SSDE值有偏差的原因。此外，通过分析SED、SSDE和SED的相关性，我们得出结论，SED是估算SED值的一个有前景的指标。
SED为SDDE提供了合适的补充体型特异性剂量数据，并且在常规放射实践中可能是估算累积剂量的更优选择。
