Oral and Maxillofacial Radiology, University of North Carolina Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA.
Oral and Maxillofacial Radiology, University of North Carolina Adams School of Dentistry, University of North Carolina at Chapel Hill, NC, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2020 Dec;130(6):717-724. doi: 10.1016/j.oooo.2020.06.004. Epub 2020 Jun 17.
This study assessed effective doses (E) from conventional and stationary intraoral tomosynthesis (s-IOT) radiography for posterior bitewing (PBW) examinations and evaluated the effect of sensor attenuation.
An adult human tissue-equivalent phantom and optically stimulated luminescent dosimeters were used. Series of 4 PBW radiographs were acquired with circular and rectangular collimation. s-IOT PBW radiographs were acquired with built-in rectangular collimation. Radiographs were acquired without and with a sensor in the beam path.
E (in µSv) was 15.7 and 8.2 for conventional-circular, 4.6 and 1.1 for conventional-rectangular, and 11.9 and 5.9 for s-IOT in sensor-absent and sensor-present scenarios, respectively. For sensor-absent exposures, E for conventional-rectangular was 29.3% and E for s-IOT was 75.8% of the conventional-circular dose. With the sensor present, these values were 13.4% and 72.0%, respectively (P < .001). Sensor-present E was lower than sensor-absent E for all modalities (P < .001). Reductions in equivalent doses were similar to effective dose reductions.
For PBW examinations, E for s-IOT was smaller than for conventional radiography with circular collimation, but larger than for conventional radiography with rectangular collimation. The presence of a sensor maintained these differences but reduced E for all modalities.
本研究评估了传统和固定式口腔体层摄影术（s-IOT）用于后牙区（PBW）拍摄的有效剂量（E），并评估了探测器衰减的影响。
使用成人组织等效体模和光激励发光剂量计。采集了 4 张 PBW 射线照片，采用圆形和矩形准直器。内置矩形准直器采集 s-IOT PBW 射线照片。在束路径中有无探测器的情况下采集射线照片。
在无探测器的情况下，传统圆形、传统矩形和 s-IOT 的 E（µSv）分别为 15.7、4.6 和 11.9；在有探测器的情况下，E 分别为 8.2、1.1 和 5.9。对于无探测器的曝光，传统矩形的 E 为传统圆形的 29.3%，s-IOT 的 E 为传统圆形的 75.8%。有探测器时，这些值分别为 13.4%和 72.0%（P<0.001）。对于所有模式，有探测器时的 E 均低于无探测器时的 E（P<0.001）。当量剂量的降低与有效剂量的降低相似。
对于 PBW 检查，s-IOT 的 E 小于圆形准直器的传统射线摄影术，但大于矩形准直器的传统射线摄影术。探测器的存在维持了这些差异，但降低了所有模式的 E。
