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目的:优化组合CR系统自动曝光控制成像参数。材料和方法:采用两种规格的成像(IP)板,用不同组合的成像参数对胸部拟人水模摄影,检测电离室密度补偿与曝光参数的变化。以所得成像数据和两种规格的IP板,对A、B、C三组患者(每组各180例),不同部位摄影,检测不同曝光剂量组合摄影的影像质量和影像的密度值。结果:A组以两种规格的IP板1、25kV摄胸部,图像对比度差;病灶细微结构显示不清。以73~85kV摄胸部,其图像明显好于125kV;B组与C组的小规格IP板(20.5cm×25.6cm)优于大规格IP板的(35cm×35cm)图像质量;影像密度值均在0.8~1.30范围内。结论:CR系统不宜采用高kV摄影;应使用合适规格的成像板。
Objective: To optimize the automatic exposure control imaging parameters of a combined CR system. MATERIALS AND METHODS: Two types of imaging (IP) plates were used. The chest simulator was imaged with different combinations of imaging parameters to detect changes in ionospheric density compensation and exposure parameters. The obtained imaging data and two kinds of IP panels were used to test the image quality and image density of the three groups of patients (180 cases in each group) and different parts of A, B and C groups. Results: A group with two specifications of the IP board 1,25kV chest, image contrast is poor; lesions showed unclear microstructure. The images were significantly better than 125 kV at 73-85 kV in the chest; the image quality of small-format IP panels (20.5 cm × 25.6 cm) in B and C groups was better than that of large-format IP panels (35 cm × 35 cm) In the range of 0.8 to 1.30. Conclusion: CR systems should not be used with high kV photography; imaging plates of the appropriate size should be used.