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对２２６例用改造后的２００ｍＡＸ线机所摄高电压胸片与两年内低电压片进行对比，高电压胸片质量明显提高，层次丰富，细微结构清楚，一级片率由０．４％上升为３８．５％，废片率由６．２％下降到０．４％，三、四级合计由７３．０％下降到１２．８％。二者相比原尘肺诊断需改订者占７４．８％，由无尘肺改为Ｉ期者最突出，新检出的７９例尘肺中由０￣＋中检出者占原０￣＋组的９０．６％。表明改机后摄片质量明显改善，影响尘肺诊断，特别是早期者极为明显。
The contrast between the high-voltage chest radiograph taken by the modified 200mAX line machine and the low-voltage radiograph within two years showed that the quality of the high-voltage chest radiograph increased obviously, the level was rich and the microstructure was clear. The first-level sheet rate increased from 0.4% 38.5%. The scrap rate decreased from 6.2% to 0.4%, while the total of three or four levels dropped from 73.0% to 12.8%. Compared with the original pneumoconiosis diagnosis, 74.8% of the patients need to be revised, the most obvious change from non-pneumoconiosis to the first phase, the newly detected 79 cases of pneumoconiosis from 0 ~ + accounted for the original 0 ~ + group 90.6%. It showed that the quality of photographic film after the machine modification improved significantly, affecting the diagnosis of pneumoconiosis, especially in the early stage.