Miller R E, Becker G J, Slabaugh R D
AJR Am J Roentgenol. 1980 Sep;135(3):487-90. doi: 10.2214/ajr.135.3.487.
Experimental studies of pneumoperitoneum in left lateral decubitus and erect positions were made in various phases of respiration to evaluate the visibility of small amounts of free intraperitonel air. Films were also made with various positions of the central ray of the x-ray beam. The expiratory left lateral decubitus film nd the mid-inspiratory chest film demonstrated the small pneumoperitoneums best. Both inspiration and expiration chest films are recommended inm the refilming and expiration chest films are recommended in the refilming sequence if a clinically suspected pneumoperitoneum is not visualized initially. In all cases the central ray of the x-ray beam should be at the highest level fo the peritoneal cavity.
在呼吸的不同阶段对左侧卧位和气腹直立位进行了实验研究，以评估少量游离腹腔内气体的可见性。还在X射线束中心射线的不同位置拍摄了影片。呼气时左侧卧位片和吸气中期胸片对小量气腹显示最佳。如果最初未观察到临床怀疑的气腹，在重新拍摄时推荐使用吸气和呼气时的胸片，且推荐按呼气胸片、吸气胸片的顺序进行重新拍摄。在所有情况下，X射线束的中心射线都应位于腹腔的最高水平。
