Martinez Amanda, Yepes Juan F, Jones James E, Wong Phillip, Johnson K Brandon, Canady Sarah, Tang Qing
Dr. Martinez is a resident, Department of Pediatric Dentistry, School of Dentistry, Indiana University and Riley Hospital for Children, Indiana University, Indianapolis, Ind., USA.
Dr. Yepes is a professor; Department of Pediatric Dentistry, School of Dentistry, Indiana University and Riley Hospital for Children, Indiana University, Indianapolis, Ind., USA;, Email:
J Dent Child (Chic). 2023 Jan 15;90(1):3-10.
To compare the effective dose (E) of the Tru-Image® rectangular collimator and the universal round collimator of a Planmeca® wall-mounted radiograph unit for two bitewing radiographs (right and left) on a pediatric phantom.
Absorbed doses utilizing the Tru-Image ®rectangular collimator and universal round collimator were acquired using an anthropomorphic 10-year-old child phantom. Each set of 24 dosimeters was exposed to two bitewing exposures with the manufacturer's child settings. Fifty clinical exposures were completed for each set and three sets were exposed for each collimator. The average E per exposure was calculated.
The overall E for the Tru-Image ®rectangular collimator and the universal round collimator were 6.3 microsieverts (μSv) and 25.3 μSv, respectively. This difference was statistically significant ( <0.001). The highest equivalent dose for both collimators was delivered to the oral mucosa. When compared to the universal round collimator, the Tru-Image ® rectangular collimator had significant dose reduction at all locations ( <0.05). When normalized and adjusted to the same source-to-end distance, there was an overall 65 percent dose reduction with the rectangular collimator.
The average effective dose was significantly reduced with the use of the Tru-Image ®rectangular collimator. Clinical use of this rectangular collimator should be considered in the pediatric population.
比较普兰梅卡（Planmeca）壁挂式X射线摄影设备的Tru-Image®矩形准直器和通用圆形准直器对儿童体模进行两张咬合翼片X线摄影（右侧和左侧）时的有效剂量（E）。
使用10岁儿童体模获取使用Tru-Image®矩形准直器和通用圆形准直器时的吸收剂量。每组24个剂量计按照制造商针对儿童的设置进行两次咬合翼片照射。每组完成50次临床照射，每个准直器照射三组。计算每次照射的平均E。
Tru-Image®矩形准直器和通用圆形准直器的总体E分别为6.3微西弗（μSv）和25.3 μSv。这种差异具有统计学意义（<0.001）。两种准直器的最高当量剂量均作用于口腔黏膜。与通用圆形准直器相比，Tru-Image®矩形准直器在所有部位的剂量均显著降低（<0.05）。当归一化并调整到相同的源到末端距离时，矩形准直器的总体剂量降低了65%。
使用Tru-Image®矩形准直器时平均有效剂量显著降低。在儿科人群中应考虑临床使用这种矩形准直器。
