Abstract
The lowest possible dose for digital compared to film-screen techniques was evaluated using a pelvic phantom. Images were taken at different kV levels, reducing the mA.s value at every kV level. Calculations of energy imparted were performed. Ten radiologists evaluated each image stating whether the anatomic points used for the pelvimetric measurements were adequately visible and measurable or not. Lateral view: the lowest dose value for the film-screen technique was 9.37 mJ (150 kV, 9 mA.s) compared to 5.35 mJ for the storage phosphor plate (SPP) technique (90 kV, 14 mA.s) and 5.17 mJ for the digital image intensifier technique (150 kV, 4.5 mA.s). The dose reduction ranged between 43-45%. AP view: the lowest dose value for the film-screen technique was 1.21 mJ (70 kV, 20 mA.s) compared to 0.15 mJ for the SPP technique (90 kV, 1.2 mA.s). The dose reduction was 88%. Consequently, substantial dose savings can be achieved using digital techniques combined with an optimisation of the kV and mA.s levels.
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