Without plaster cast With plaster cast CT 64 slice Protocol 1 Protocol 2 Protocol 3 Protocol 4 Protocol 5 kV 80 80 80 100 100 mA 40 40-150 40-150 80 45 time [s] 4.6 7.8 9 4.6 4.6 Collimation 32X0.625 32X0.625 32X0.625 32X0.625 32X0.625 length [mm] 100 185.5 185.5 100 100 rot. time [s] 0.4 0.4 0.4 0.4 0.4 pitch 0.531 0.531 0.531 0.531 0.531

Table 1: CT parameters of five different CT protocols for diagnosing occult scaphoid fractures without and with a plaster cast.