Don S, Cohen M D, Kruger R A, Winkler T A, Katz B P, Li W, Dreesen R G, Kennan N, Tarver R, Klatte E C
Department of Radiology, Indiana University Medical Center, James Whitcomb Riley Hospital for Children, Indianapolis.
Radiology. 1995 Mar;194(3):727-30. doi: 10.1148/radiology.194.3.7862970.
To quantitatively compare computed radiography (CR) and screen-film radiography (SFR) in the detection of pneumothorax in an animal model that simulates the neonate.
Three rabbits underwent placement of 5-F catheters in the right pleural space. Eight CR and eight SFR images were obtained. Volume-controlled pneumothorax was induced by incrementally injecting 4 cm3 of air (24 cm3 total) and four CR and four SFR images were obtained after each injection. Four radiologists blindly viewed the images twice (eight readings per image, 1,600 total observations). A dichotomous yes-no score for the presence of pneumothorax was used to calculate the volume detection threshold (VDT), defined as the air volume at which 50% of the pneumothoraces can be detected. The authors plotted the likelihood of a pneumothorax against the air volume by using the confidence indicator.
Intraobserver VDT values for CR and SFR were not significantly different.
CR is as accurate as SFR in the detection of pneumothorax in this quantitative animal model.
在模拟新生儿的动物模型中，对计算机X线摄影（CR）和屏-片X线摄影（SFR）检测气胸的能力进行定量比较。
对3只兔子在右侧胸腔置入5-F导管。获取8幅CR图像和8幅SFR图像。通过逐步注入4 cm³空气（共24 cm³）诱导容量控制型气胸，每次注入后获取4幅CR图像和4幅SFR图像。4名放射科医生对图像进行两次盲法观察（每幅图像8次读片，共1600次观察）。采用二分法的是/否评分来计算气胸的容积检测阈值（VDT），定义为能检测到50%气胸的空气容积。作者通过使用置信指标绘制气胸可能性与空气容积的关系图。
CR和SFR的观察者内VDT值无显著差异。
在这个定量动物模型中，CR检测气胸的准确性与SFR相当。
