Benson P E, Richmond S
University Dental Hospital of Manchester, UK.
Eur J Orthod. 1997 Aug;19(4):397-409. doi: 10.1093/ejo/19.4.397.
Radiographs are essential in the planning and assessment of treatment, as well as the study of growth patterns, but before subjecting a child to X-rays, the clinician must ensure that it is justifiable on clinical grounds. The use of cephalometric radiography, particularly in the young patient with a cleft of the lip and/or palate, has been questioned. The aim of this project was to investigate the validity and reproducibility of using a photograph or video image, compared with a radiograph, for measurement of the soft tissue profile of the face. A radiographic phantom head was used, which consisted of a dry bone skull encased in a soft tissue substitute. The method involved comparing direct measurement of the head in a Reflex Metrograph with the results of computerized digitizing of a cephalometric radiograph, digitizing a video image from a computer screen and measurement of a photograph. It was found that digitizing of the soft tissue outline of a radiographic phantom head from a video image was neither a valid, nor a reproducible method of replacing cephalometric radiographs in the measurement of the soft tissue profile of the face. A photograph may be a clinically acceptable alternative, but errors from this method are likely to be larger than those due to digitization of a radiograph.
X光片在治疗方案的规划与评估以及生长模式研究中至关重要，但在让儿童接受X光检查之前，临床医生必须确保从临床角度来看这样做是合理的。头影测量X光摄影的应用，尤其是在患有唇裂和/或腭裂的年轻患者中，一直受到质疑。本项目的目的是研究与X光片相比，使用照片或视频图像测量面部软组织轮廓的有效性和可重复性。使用了一个X光摄影模型头，它由包裹在软组织替代物中的干燥颅骨组成。该方法包括将在反射式测量仪中对头的直接测量结果与头影测量X光片的计算机数字化结果、计算机屏幕视频图像的数字化结果以及照片测量结果进行比较。研究发现，从视频图像对头影测量模型头的软组织轮廓进行数字化，在测量面部软组织轮廓时既不是替代头影测量X光片的有效方法，也不是可重复的方法。照片可能是临床上可接受的替代方法，但这种方法产生的误差可能比X光片数字化产生的误差更大。
