AbstractAn invivo bone densitometer has been designed to be used
with a full wave rectified X ray set. The densitometer has been
constructed to give a fast and accurate scan of the ulna with a
spatial resolution very much better than hitherto achieved.
The ulna was chosen so that a wide range of patients, who
might have limited agility could be easily scammed for bone
mineral content with a view to the early diagnosis of bone
disease and to study progress and response to therapy.
To overcome the X ray output fluctuations due to variations
of the supply voltage, an electronic compensation technique
using two detectors was developed. One of the detectors samples
the total incident X ray intensity over a portion of the every
half cycle, and the other the X ray intensity transmitted
through the ulna.
Tests to determine the performance of the compensation
mechanism over a wide range of operating conditions were made,
The reproducibility of the densitometer has been demonstrated
by making scans using simulated dead and invivo bone.
Theoretical calculations using a simplified theory have Been
made to predict the accuracy of the compensation technique and
the expected voltage signals. These calculations are compared
with experimental observation.
|Date of Award||1973|
- in vivo
- bone densitometer