Table 2. Dose-area product and entrance skin dose for different DXA machines (98,99).

Machine	DAP spine study (mGy·cm2)	ESD (µGy)
Lex X05	30	–
Hologic 4500	36	200
Lunar Prodigy	10	37
Lunar DPX	5	10.25
Norland XR 36	2	0.9–44.4
Hologic QDR 1000	–	60
Hologic QDR 2000	–	138
Lunar Expert	–	895

DXA, dual energy X-ray absorptiometry; DAP, dose-area product; ESD, entrance skin dose.