Figure 2.

(a) Mapping of the measured stray radiation air kerma values for a hand-held dental X-ray device positioned for a bitewing image of the molars, indicating the spatial variation for each of the measurements. (b) For visual purposes only, a grid of more refined pixels of the measured stray radiation values generated by a bicubic interpolation using a 4 × 4 neighbourhood weighted average (MathWorks, Natick, MA). Note that any calculations used throughout this work were performed with measured values only, and not interpolated values.