This article [J. Med. Imag. 6(3), 033501 (2019), doi: 10.1117/1.JMI.6.3.033501] was originally published online on 9 July 2019. In the original version of the article, there was a clerical error in the construction of the curves in Fig. 3(b) from a matrix of calculated results. This has no effect on the conclusions of the article. The original figure and the corrected figure are provided here (the caption did not change).

Original:

Fig. 3

Comparison of (a) DC signal for a single screen ($T=300\mu \mathrm{m}$) with white or black backing, in FI and BI, for a given exposure. (b) The corresponding ratio of BI:FI signal.

Corrected:

Fig. 3

Comparison of (a) DC signal for a single screen ($T=300\mu \mathrm{m}$) with white or black backing, in FI and BI, for a given exposure. (b) The corresponding ratio of BI:FI signal.

This article was corrected online on 25 July 2019. It appears correctly in print.