The dual-photon absorptiometry
(DPA) technique extended BMD measurement to all parts of the body, including the spine and proximal femur.
Single-photon absorptiometry measurements in the forearm, and both dual-photon absorptiometry
and quantitative computed tomography in the spine indicate a premenopausal loss of bone mass [1-3] that becomes slightly more accentuated in the perimenopausal period .
Anterior-posterior spine measurements with dual energy techniques  (dual-photon absorptiometry
[DPA] and dual-energy x-ray absorptiometry [DEXA] are not as sensitive as QCT for the detection of osteopenia because they measure the entire vertebral body (cortical bone and trabecular bone) plus the posterior elements.
* Single- or dual-photon absorptiometry
(SPA or DPA)
(DPA) of the lumbar spine was performed using a Novo BMC-Lab 22a densitometer with a gadolinium source.
 Much of the controversy has centered on the suitability of single- vs dual-photon absorptiometry
and whether one should screen all women.
Total body bone mineral and lean body mass by dual-photon absorptiometry
. Calcif Tissue Int.
These compartments once were determined separately using different techniques [6-8], but now they all can be studied using the same technique since technological developments in dual-photon absorptiometry
(DPA), originally used for bone density studies [9, 10], now permit evaluation of TBBM, FFM, and F.