Quantitative digital radiography versus dual photon absorptiometry of the lumbar spine.

摘要: Lumbar spine bone mineral density (BMD) was measured by quantitative digital radiography, a new dual energy x-ray technique, and 153Gd photon absorptiometry (DPA) in 85 patients. Each patient twice the method once DPA on same day, with repositioning between measurements. Serial measurements were made an hydroxyapatite phantom embedded tissue-equivalent plastic to evaluate long term reproducibility of each instrument. The spinal BMD 2 techniques linearly related highly correlated (r = 0.98) over range from severely osteopenic high normal. This correlation not affected age, weight, or measured. Quantitative radiography's long-term using stable for 180 days (coefficient variation, 0.23%); values 3 times as variable 170 variation 0.73%) increased 1.0% (P < 0.0001) after software change. short r...