Brown B M, Oshita A K, Castellino R A
J Comput Assist Tomogr. 1983 Jun;7(3):415-8. doi: 10.1097/00004728-198306000-00005.
A total of 40 neck computed tomographic (CT) scans in adult patients were retrospectively reviewed and absolute measurements made of the anteroposterior (TRAP) and transverse (TRTR) air spaces at the first tracheal cartilage. For each patient, ratio measurements were calculated of the anteroposterior (TRAP/TC) and transverse (TRTR/TC) tracheal air space relative to the glottic air space at the true cord level. Mean TRAP (2.01 cm) and TRTR (1.84 cm) measurements for normal patients agreed closely with figures reported in prior cadaver preparation studies. The lower normal limit found for absolute tracheal diameter was 1.5 cm (TRAP) and 1.4 cm (TRTR), whereas lower normal limits for relative tracheal to glottic air space diameters were 0.7 (TRAP/TC) and 0.6 (TRTR/TC).
回顾性分析了40例成年患者的颈部计算机断层扫描（CT），并对第一气管软骨处的前后径（TRAP）和横径（TRTR）气道间隙进行了绝对测量。对每位患者，计算了相对于真声带水平声门气道间隙的前后径（TRAP/TC）和横径（TRTR/TC）气管气道间隙的比值测量值。正常患者的平均TRAP（2.01 cm）和TRTR（1.84 cm）测量值与先前尸体解剖研究报告的数据非常吻合。气管绝对直径的正常下限为1.5 cm（TRAP）和1.4 cm（TRTR），而气管与声门气道间隙直径的相对正常下限为0.7（TRAP/TC）和0.6（TRTR/TC）。
