1 Department of Oral and Maxillofacial Surgery, Plastic Surgery, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz , Germany.
2 Department of Prosthodontics, University of Heidelberg, Dental School , Heidelberg , Germany.
Dentomaxillofac Radiol. 2019 Mar;48(3):20180184. doi: 10.1259/dmfr.20180184. Epub 2019 Jan 3.
: In a retrospective cohort study CBCT images of 4986 patients from the patient database from the Department of Oral Radiology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany were included and the rate of re-exposures was counted. Patients were stratified into those who received a scan with the small field-of-view CBCT or the large field-of-view CBCT. The effect of patient-related parameters as age and gender was implicated. As a further device-specific parameter, the statistical analysis included whether the selection of the field of view due to the device type had a significant influence on the occurrence of re-exposures. Furthermore, the rescans were analyzed with regard to their causes.
: In total, CBCT images of 82 (1.6%) patients had to be repeated. Looking at the two different devices, in 42 (1.3%) patients that received a scan with the large field-of-view CBCT and in 40 (2.3%) patients that received a scan with the small field-of-view CBCT respectively needed a retake. There was no statistically significant correlation between age and gender to retakes. For the small field-of-view-size significantly more retakes were observed than for the large one. With 46% motion artifacts were the most frequent causes for a re-exposure of the patient.
: Gender and age did not have an impact on the occurrence of re-exposures. Patients who received a scan with the small field-of-view CBCT were significantly more often rescanned than those with the large field-of-view CBCT.
在一项回顾性队列研究中，纳入了德国美因茨约翰内斯古腾堡大学医学中心口腔放射学系患者数据库中的 4986 名患者的 CBCT 图像，并计算了再次曝光的比例。患者分为接受小视野 CBCT 或大视野 CBCT 扫描的患者。研究涉及了与患者相关的参数，如年龄和性别。作为进一步的设备特定参数，统计分析包括由于设备类型选择视野是否对再次曝光的发生有显著影响。此外，还分析了重新扫描的原因。
总共，有 82 名（1.6%）患者的 CBCT 图像需要重复扫描。观察两种不同的设备，在接受大视野 CBCT 扫描的 42 名（1.3%）患者和接受小视野 CBCT 扫描的 40 名（2.3%）患者中，分别有需要重新扫描。年龄和性别与再次扫描之间没有统计学上的显著相关性。在小视野尺寸的情况下，明显观察到更多的重新扫描。由于运动伪影，46%是患者再次曝光的最常见原因。
性别和年龄对再次曝光的发生没有影响。接受小视野 CBCT 扫描的患者比接受大视野 CBCT 扫描的患者更频繁地需要重新扫描。
