Osterman F A, Zeman G H, Rao G U, Gayler B, Kirk B G, James A E
Radiology. 1977 Sep;124(3):689-94. doi: 10.1148/124.3.689.
Positive-mode xeroradiography is an excellent method of visualizing soft-tissue structures in mammography and other procedures; however, toner deletions over a large area may preclude adequate delineation of the soft tissues near high-density structures such as bone. Use of the negative mode in the development cycle provides excellent demonstration of the soft tissues without toner deletions and requires only about 70% of the exposure needed in the positive mode. Negative-mode images also exhibit greater changes in radiographic contrast than those observed with the positive mode. The extent of achilles tendon lacerations was shown particularly well by this technique.
正模式干板X线照相术是乳腺摄影和其他检查中显示软组织结构的一种极佳方法；然而，大面积的调色剂缺失可能会妨碍对高密度结构（如骨骼）附近软组织的充分描绘。在显影过程中使用负模式可出色地显示软组织，且无调色剂缺失，并且所需曝光量仅为正模式的约70%。负模式图像在射线照相对比度方面的变化也比正模式观察到的更大。这种技术能特别清晰地显示跟腱撕裂的程度。
