In vivo roentgenographic examination of parasympathetic innervation of small airways. Use of powdered tantalum and a fine focal spot x-ray tube.
In vivo roentgenographic examination of parasympathetic innervation of small airways. Use of powdered tantalum and a fine focal spot x-ray tube.
复制标题
小气道副交感神经支配的体内X线检查。
DOI：
10.1097/00004424-197101000-00002
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发表时间：
1971
影响因子：
6.7
通讯作者：
J. Austin
中科院分区：
文献类型：
--
作者：
J. Nadel;G. A. Cabezas;J. Austin
用钽粉作造影剂，小焦斑X线管(侧径0.06 mm)和一次X线放大率，对活体周围呼吸道进行了X线片研究。尽管X射线管的输出有限(2.5毫安)，但我们在120kVp的短曝光下获得了令人满意的支气管图。这项技术使我们能够研究迷走神经刺激对迷走神经切除猫和狗的呼吸道的影响。迷走神经刺激可引起气管和大支气管轻度收缩，最大程度收缩静息直径1~5 mm的犬和0.8~2.0 mm的猫。直径小于0.8~1.0 mm的气管狭窄减轻，直径小于0.5 mm的气道狭窄不明显。在与不同焦点侧边尺寸的X射线管的对比研究中，我们确定焦点为0.06 mm的X射线管增加了观察者发现呼吸道直径变化的能力。
A study was made roentgenographically of the peripheral airways in vivo by using powdered tantalum as contrast medium, a small focal spot x-ray tube (0.06 mm side dimensions), and primary radiographic magnification. Despite the limited output of the x-ray tube (2.5 ma), we obtained satisfactory bronchograms with short exposures at 120 kVp. This technique enabled us to study the effect of vagal stimulation on the airways in vagotomized cats and dogs. Vagal stimulation resulted in slight constriction in the trachea and large bronchi and maximum constriction in airways whose resting diameters were 1–5 mm in dogs and 0.8–2.0 mm in cats. Constriction was diminished in airways with diameters less than 0.8–1.0 mm and was insignificant in airways less than 0.5 mm in diameter. In a comparative study with x-ray tubes of different focal spot side dimensions, we established that the tube with a 0.06 mm focal spot increased the ability of observers to detect changes in airway diameter.