Bone Mineral Densitometry (BMD) Precision and Scattered Radiation Level of Dual Energy X-ray Absorptiometry (DXA) Installed in Mymensingh Nuclear Medicine Unit, Bangladesh

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.