Abstract
The dependency upon tube voltage of any accurate "fixed kVp" approach to variable part thickness radiography is investigated by employing a theoretical model involving variation of the effective linear attenuation coefficient with tube voltage, for both ideal narrow and broad beam attenuation. Predicted increase rate ranges for tube charge (mAs) per unit thickness (centimetre) increment are presented as a function of tube voltage (kV) for several filtration cases. The increase rates range from 80 per cent per centimetre to approximately zero across the considered ranges of filtration, tube voltage and beam area. The increase rates are seen to be heavily dependent upon the beam area/attenuation conditions at the image receptor and generally disagree significantly from the commonly used 25 per cent value of the standard approach.
| Original language | English |
|---|---|
| Pages (from-to) | 167-171 |
| Number of pages | 5 |
| Journal | Radiographer |
| Volume | 49 |
| Issue number | 3 |
| Publication status | Published - 2002 |