锥形束CT与螺旋CT测量茎突长度的对比分析

Comparative study of cone-beam CT and spiral CT in measuring the length of styloid process

目的比较锥形束CT（CBCT）与高分辨率螺旋CT在测量茎突中的差异，明确CBCT在测量茎突长度中的作用。方法本研究从耳鼻咽喉头颈外科解剖教研室随机挑选5例完整的尸头标本，分别经CBCT与螺旋CT扫描，从所得的DICOM扫描文件中分别对茎突进行多平面重建，调整图像，直至图像能在同一平面显示茎突根部至尖端全长，测量茎突长度，对比两种方法所测得的茎突长度的差异。结果共扫描尸头标本5例，含茎突5对（10个），CBCT法所测茎突长度平均（26．8±5．5）mm，螺旋CT法所测茎突长度为（27．1±5．4）mm，两组相比差异无统计学意义。结论在测量茎突长度方面CBCT与螺旋CT具有等效性。

Objective To compare the difference of measuring the length of styloid process between spiral CT with high resolution and cone-beam CT（CBCT）. Methods Five specimens （ including 5 pairs of styloid processes） were selected randomly from the Anatomy Laboratory of Otolaryngology Department, all the specimens underwent spiral CT with high resolution and cone-beam CT retrospectively. With the original DICOM data, the styloid processes were shown in one plate by multiple plate reconstruction technique, and later the length of styloid processes of each specimen were measured separately by software NNT Viewer （ to CBCT） or Osrix （to spiral CT with high resolution）. Results The length of styloid processes measured by CBCT and spiral CT was （26. 8±5.5） mm and （27. 1±5.4） mm respectively, and there was no statistical difference between the two groups. Conclusion In respect of measuring the length of styloid process, the CBCT has the same value in clinical practice comparing to spiral CT with high resolution.