QDR
®
4500 Technical Manual
1-10
BMD Precision:
SCAN TIME DOSE
EXAM MODEL (seconds) in vivo PRECISION mGy mrad
AP Spine Array All 60 1.0% 0.20 20.0
AP Spine Fast All 30 1.5% 0.10 10.0
AP Spine High Definition A,SL 120 1.0% 0.20 20.0
AP Spine Turbo A,SL 10 2.0% 0.07 7.0
W,C 15 2.0% 0.05 5.0
Forearm A,SL 30 1.0% 0.05 5.0
W,C 30 1.0% 0.10 10.0
Hip Array All 60 1.0% 0.20 20.0
Hip Fast All 30 1.5% 0.10 10.0
Hip High Definition A,SL 120 1.0% 0.20 20.0
Hip Turbo A,SL 10 2.0% 0.07 7.0
W,C 15 2.0% 0.05 5.0
Lateral Spine Array A,SL 240 1.0% 0.70 70.0
Lateral Spine Fast A,SL 120 1.0% 0.35 35.0
Lateral Spine High Def. A,SL 240 1.0% 0.70 70.0
Whole Body A 180 1.0% 0.01 1.0
W 407 1.0% 0.015 1.5
Duty Cycle:
A
50% for all scan modes except Whole Body
100% for Whole Body scans
SL,W,C 50% for all Scan Modes
Leakage Technique Factors
The leakage technique factors for all models of QDR 4500’s are the same. It is the maximum
continuous current at the maximum peak potential. This is X-ray mode #3. Peak potential
140/100kVp. (dual energy), current 10mA peak 25% duty cycle or 2.5mA average.
Minimum Beam Filtration
The minimum filtration permanently in the beam is 3.7mm Al equivalent @80kV.
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