Catić A, Celebić A, Valentić-Peruzović M, Catović A, Kuna T
School of Dental Medicine, University of Zagreb, Croatia.
Coll Antropol. 1998 Dec;22 Suppl:139-45.
The objective of this study was to evaluate the precision of the horizontal and vertical linear dimensional measurements on orthopantomographic images. Different horizontal and vertical distances denoted by metal markers were measured on 25 dry mandibles. The same mandibles were then positioned in an orthopantomographic machine and their radiographic images were made. Measurements of the same distances were repeated on the panoramic images and compared to 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 the calculated magnification factors, the latter being closer to 1.00. The study also showed that linear measurements made only on one side of panoramic images of mandibles were close to actual dimensions of dry mandibles, while the measurements which extended across the midline of mandibles were greatly enlarged due to large magnification factors.
本研究的目的是评估全景断层图像上水平和垂直线性尺寸测量的精度。在25个干燥下颌骨上测量由金属标记表示的不同水平和垂直距离。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X线影像。在全景图像上重复测量相同的距离，并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。
