Abstract
Dual Energy X-ray Absorptiometry (DXA) has long been and remains the most widely used technique for Bone Mineral Densitometry (BMD) measurement. Several manufacturers developed their performance of DXA with various types of measurement software but still not a unique data processing system which can ensure the unique measurement for the patients. The aim of this article is to show the precision level of BMD in DXA machine GE (Model: DPX Lunar) installed at INMAS, Mymensingh and to measure background radiation consistency during acquisition. A rectangular shape QA phantom of variable density for precision measurement and survey meter (Austral Rad Mini 8 in 1) for radiation monitoring were used. Coefficient of Variation for BMD values was 0.37% and always ranges from 0.32% to 0.38%. Radiation survey meter reading always showed the values ranges from 0-3 µSv/hr. It can be concluded that these good QC are not the conformity of exact measurement because there some reference values involved in T-score or Z-score measurement. These reference values were taken from healthy adult Caucasian women which are different from Bangladeshi population.
Highlights
Bone Mineral Densitometry (BMD) & bone mineral content (BMC) BMD in g/cm2 examination of two QC figures can be compared with either process control CUSUM chart or Shewhart chart
Our daily measured Coefficient of Variation (CV) for BMD always ranges from 0.32% to 0.38%
From ongoing research in different countries, it is established that T-score is suitable for post menopausal women and Z-score is suitable for young adult [16]
Summary
First Dual Energy X-ray Absorptiometry (DXA) was introduced in America in 1987 [1]. American manufacturers provide central DXA system all over the world, namely GE, Hologic and Cooper Norland. Each manufacturer offers varity of models [2]. Our DXA system is from GE (Model: DPX Lunar) was installed in 2009. It generates soft X-ray (~35 keV) and hard X-ray (~70keV) simultaneously to measure bone mineral densitometry (BMD) [3]
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