高、低电压胸片肺组织被遮盖程度对比的研究

The Comparison on Obscured Degree byOverlapped Shadows between High and LowKilovoltage Chest Radiographs

随机选取９０位患者，同一天摄取高、低电压胸片各一张。具有可比性的共８６对。在８６对高、低电压胸片上测定各结构对肺的遮盖面积及测估遮盖程度。得低电压胸片仅能显示５３％的肺结构信息；高电压胸片能显示７２％的肺部信息。高电压胸片的肺部信息显示量较低电压胸片提高３６％。通过对比明确显示高电压胸部摄影能有效的提高肺部整体信息显示量；高电压胸片能有效的降低重叠影像的遮盖作用。

he posterioanterior chest radiographsof 90 patients were randomlv taken with bothhigh and low kV technique in the same dayfor one patient.86 pairs of them were compa-rable in technique quality,the obscured areaand degree between each pair of radicgraphawere estimated by a semiguantitative methodadopted from the relative obscuration defini-tion. The results showed that only 53% ofpulmonary parenchyma information might re-tain in low kV radiographs,but 72% in thatof the high kV,was 36% increased comparingwith low kilovoltage radiographs. The resultsuggests that the high kV technique may effi-ciently lower the obscuration of the over-lapped shadows in chest radiograph.