Gher M E, Richardson A C
Periodontics Department, Naval Dental Center, San Diego, California, USA.
Int J Periodontics Restorative Dent. 1995 Jun;15(3):268-83.
Periapical, panoramic, linear tomographic, and computerized tomographic radiographs were made of a partially dentate human mandible with four implants in place. Measurements taken from the radiographs and computer-generated images were compared to measurements made directly on the cross-sectioned test specimen. Periapical radiographs produced the most accurate measurements. Computerized and linear tomographic images provided the unique advantage of cross-sectional views of anatomic structures, but image blurring inherent to linear tomography and volume-averaging error inherent to computerized tomography affected the accuracy of measurements made from these images. The use of a dense dimensional reference object helped to compensate for radiographic distortion and is appropriate when projection radiographic techniques are used. The CT reference scale provided the most accurate method for interpreting measurements made from the computerized tomogram. The use of a dense dimensional reference object is inappropriate with CT because of its volume-averaging error.
对一具部分牙列的人类下颌骨拍摄了根尖片、全景片、线性断层片和计算机断层扫描片，该下颌骨已植入四颗种植体。将从X光片和计算机生成图像上获取的测量值与直接在经横切的测试标本上进行的测量值进行比较。根尖片产生的测量结果最准确。计算机断层扫描和线性断层扫描图像提供了解剖结构横断面视图的独特优势，但线性断层扫描固有的图像模糊和计算机断层扫描固有的容积平均误差影响了从这些图像进行测量的准确性。使用高密度尺寸参考物有助于补偿射线照相失真，并且在使用投影射线照相技术时是合适的。CT参考标尺为解释从计算机断层扫描图像得出的测量结果提供了最准确的方法。由于其容积平均误差，使用高密度尺寸参考物对CT不合适。
