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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: J Occup Environ Med. 2011 Oct;53(10):1146–1154. doi: 10.1097/JOM.0b013e31822b8356

Figure 2.

Figure 2

Examples of simulated X-ray images of threat bags with typical hit rates (HR). A: gun with low target difficulty in the center (HR was 75%), B: knife with low target difficulty in upper right corner (HR was 56.5%), C: gun with high target difficulty in lower right corner (HR was 50%), D: knife with high target difficulty in lower left corner (HR was 32.5%). Reproduced from Basner M, Rubinstein J, Fomberstein KM, et al. Effects of Night Work, Sleep Loss and Time on Task on Simulated Threat Detection Performance. SLEEP 2008;31(9):1251–1259 (with permission)