Catić A, Celebić A, Valentić-Peruzović M, Catović A, Jerolimov V, Muretić I
School of Dental Medicine, University of Zagreb, Croatia.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1998 Aug;86(2):242-8. doi: 10.1016/s1079-2104(98)90132-9.
The purpose of this study was to evaluate the precision of dimensional measurements of the mandible on orthopantomographic images and thus to evaluate their dimensional reliability. Different distances denoted by metal markers were measured on 25 dry mandibles. The same mandibles were then positioned in an orthopantomographic machine, and radiographic images of them were made. Measurements of the same distances were made on the panoramic images and then compared with the results of the measurements on the dry mandibles. All results were statistically analyzed. The results showed significant difference between the magnification factor listed by the manufacturer and calculated magnification factors, the latter being closer to 1.00. The study also showed that linear measurements made on only one side of the panoramic image of a mandible were very close to the actual dimensions of the dry mandible, whereas measurements that extended across the midline of the mandible were greatly enlarged because of large magnification factors; therefore, such measurements should not be made.
本研究的目的是评估全景断层图像上下颌骨尺寸测量的精度，从而评估其尺寸可靠性。在25个干燥下颌骨上测量了由金属标记表示的不同距离。然后将相同的下颌骨放置在全景断层摄影设备中，并拍摄其放射影像。在全景图像上对相同距离进行测量，然后与干燥下颌骨的测量结果进行比较。所有结果均进行了统计学分析。结果显示，制造商列出的放大倍数与计算得出的放大倍数之间存在显著差异，后者更接近1.00。该研究还表明，仅在下颌骨全景图像一侧进行的线性测量非常接近干燥下颌骨的实际尺寸，而跨越下颌骨中线的测量由于放大倍数较大而被大幅放大；因此，不应进行此类测量。
