Abstract
Objectives
The scatter radiation and scatter rejection effect of air gaps in cephalometric radiography were evaluated using an effective scatter point source (ESPS) model.
Methods
A 16-cm-thick water-equivalent phantom was used to measure the scatter fraction. The distance from the source to the center of the object (SOD) was 150, 200, or 300 cm. The air gap was varied from 0 to 96 cm for each SOD. A photostimulable phosphor plate was used as the X-ray sensor. The measured scatter fraction ESPS model was used to simulate the scatter rejection by the air gap, and the predictions were compared with the grid.
Results
There was excellent agreement between the ESPS model and the scatter measurements. The air gap reduced the scatter radiation, especially for an SOD of 200 or 300 cm, while keeping an object magnification of 1.1 in view of the signal-to-noise ratio improvement factor.
Conclusions
The results suggest that a grid should not be used in cephalometric radiography.
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Tsuji, Y., Araki, K., Endo, A. et al. Scatter radiation and the effects of air gaps in cephalometric radiography. Oral Radiol 22, 7–13 (2006). https://doi.org/10.1007/s11282-006-0038-7
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DOI: https://doi.org/10.1007/s11282-006-0038-7