Dual-Energy X-Ray Absorptiomery Technology



The fundamental principle of Dual Energy X-ray Absorptiometry (DXA) is the measurement of transmission of X-rays, produced from a stable source, at high and low energies through the body. The advantages of using X-rays instead of photon absorptiometry include a shorter acquisition time and improved accuracy and precision due to the increased photon flux. Over the last few decades, improvements in precision and resolution have been coupled with a decrease in radiation exposure. With the increased availability of DXA, there has been a dramatic rise in its use in pediatric research and clinical practice. However, given DXA is a projectional technique, objects are analyzed as two-dimensional; as such, problems may arise when the dimensions of the area scanned change with time, as is the case in a growing child. Though DXA technology has numerous strengths, there remain a number of factors that must be considered carefully when interpreting DXA results in pediatrics.


DXA Precision Radiation Normative data Artifacts 


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Department of Radiology and Biomedical ImagingUniversity of California, San FranciscoSan FranciscoUSA
  2. 2.Department of EndocrinologyBirmingham Children’s HospitalBirmingham, West MidlandsUK

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