There is a tradeoff between DEXA and CT, but now it can be avoided. When CTs are obtained for other reasons, the data can be used "opportunistically" to screen for osteoporosis. Part of the increased cost of traditional QCT is the requirement for specialized calibration phantom and analysis software. In the past decade, improvements in CT technology have facilitated "phantomless" approaches to CT measurement of bone, thus eliminating the added cost. 

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