Journal of Medical Physics
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Year : 1996  |  Volume : 21  |  Issue : 2  |  Page : 64-70

Two New Formulae For Estimating The Output Of X-Ray Units



Correspondence Address:
Pratik Kumar


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The radiation output from different X-ray machines varies considerably. For a given kVp and mAs, this variation results from voltage waveform from the generator, tube-age and filtration. In routine practices, no exposure meter is fitted in the controls of X-ray machines. The most appropriate way to know entrance skin exposure (ESE) to the patient is by using the standard formulae. But, as yet, no one has evaluated the different formulae available in the literature, for their validity when applied to different machines. In the present study, we have first measured the ESE for seven X-ray machines and then estimated the % error between experimental and calculated values with five formulae and nomogram available in literature. Since all these formulae gave errors exceeding # 35% of the actual value, we have evolved two new formulae and developed appropriate computer programs. These two formulae are able to provide an estimate of ESE within a mean % error of -3.9 + 14.5 and 0.7 + 19.4 respectively, for seven X-ray machines included in the study


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