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Efficient Use of Diagnostic Imaging and Objective Evaluation of Work that Reflects Patient Condition

In this study, as a secondary use of data stored on the hospital’s information system, we developed a tool for calculating scan time and personnel cost based on patient condition with a view to realizing safe photographic testing that is tailored to the needs of the aging society, and improving the labour environment. We also calculated personnel costs-as a medical resources input-with the aim to promote the appropriate placement of medical staff and the objective evaluations of work. We utilized data accumulated in the hospital information system to ascertain patient conditions and classified the patients according to patient condition. We calculated the non-enhanced head CT scan times, and then obtained scan time coefficients and personnel cost coefficients. The mean scan time per non-enhanced head CT scan was 5.82 ± 3.83 minutes. The equivalent figure for “carried/freedom level 1” patients was, at 6.59 ± 4.27 minutes, longer than the mean examination time. The personnel costs for scans administered to “unassisted walking” patients were one third of the costs for scans administered to “carried/freedom level 1” patients, suggesting that personnel costs for the same type of scan vary depending on patient condition. Thus, more accurate scan time predictions can be achieved by referring to conveyance category, and especially to freedom level. Furthermore, personnel cost coefficients can serve as a yardstick for making objective evaluations of work.


Shida K, Uto Y, Muranaga F, Iwaanaguchi T, Kumamoto I

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