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目的探讨小乳腺在计算机X线摄影(CR)中能清晰显示其组织结构的方法。方法分析150份乳腺CR图像的显示情况,发现乳腺结构显示得清晰与否和乳腺的大小有关;用24阶铝梯模拟小乳腺,用不同的投照参数以及不同方法遮挡成像板(IP)直接曝光区进行投照,再用CR系统处理并直接打印出胶片,然后用密度仪分别测量。结果CR中用遮光器遮挡IP板边缘10~15mm宽度或用0.2 mm厚、边长22 mm的正方形铜片遮挡IP板中心位置,都能明显改善铝梯灰阶的显示。同样方法进行实际的小乳腺投照,乳腺的组织结构均能清晰显示。结论在用CR系统进行小乳腺摄影时,用遮光器或薄铜片对处于直接曝光区的检测点进行适当遮挡,能明显改善乳腺组织结构的显示情况。
Objective To explore the method of small breasts can clearly show its structure in computerized radiography (CR). Methods 150 cases of breast CR image display and found that the structure of the breast showed clear or not and the size of the breast; 24-step aluminum ladder simulation of small breasts, with different projection parameters and different methods to block the imaging plate (IP) direct Projected exposure area, and then CR system processing and direct print out the film, and then were measured with a density meter. Results In the CR, the shading of the aluminum plate with a width of 10 ~ 15mm or the square plate of copper with a thickness of 0.2mm and a length of 22mm to block the center of the IP plate can significantly improve the display of the gray scale of the aluminum ladder. The same method of actual small breast projection, breast tissue structure can be clearly displayed. Conclusions When using the CR system for small mammography, the occlusion of the detection points in the direct exposure area with a shutter or thin copper foil can significantly improve the display of the breast tissue structure.