Affordable Access

Publisher Website

In vivo measurement of radius calcium/phosphorus ratio by X-ray absorptiometry

Authors
Journal
Applied Radiation and Isotopes
0969-8043
Publisher
Elsevier
Publication Date
Volume
51
Issue
3
Identifiers
DOI: 10.1016/s0969-8043(99)00056-1
Disciplines
  • Design
  • Physics

Abstract

Abstract We describe a new method for assessing the skeletal Ca/P ratio in vivo using X-ray absorptiometry. By placing cerium (Ce) and samarium (Sm) filters in the X-ray beam from a commercial X-ray source (Norland), mean photon energies of 39 and 89 keV were obtained. The instrument was designed to take measurements of the forearm, at a site located at the distal 1/3 of the radius. The system was calibrated with three bone phantoms: Ca 10(PO 4) 6(OH) 2, Ca(HPO 4)(H 2O) 2 and Ca(HPO 4) 2(H 2O)). The precision for measuring the Ca/P ratio in the human radius was 2.3% CV for a skin dose to the forearm ranging from 0.3 to 0.4 mGy, depending on the width of the arm. The Ca/P ratio of the radius was significantly lower in patients with postmenopausal osteoporosis than in premenopausal controls.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

In vivo measurement of radius calcium/phosphorus r...

on Applied Radiation and Isotopes September 1999

Bone hydroxyapatite/collagen ratio. In vivo measur...

on Annals of the New York Academy... May 2000

Measurement of mandibular bone density ex vivo and...

on Archives of oral biology March 1993

133Xe for the in vivo X-ray fluorescence measureme...

on Physics in Medicine and Biolog... November 1994
More articles like this..