Abstract
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Aim: Several manual data entries, such as patient weight, injected dose, injection time, residual dose and time; respective units are needed for PET/CT imaging. Any error in entering one of these information will lead to an error in the measurement of the SUVmax of the resultant scans. Some systems allow the user to correct such information retrospectively after the examination. Material and
Methods: A nonuniform “body phantom” was prepared with 6 lesions (distance; 10 mm to 35 mm) and filled with 207MBq 18F-FDG-water. The phantom was placed in the center of PET/CT gantry (Philips, TruFlight Select, 16 slices) and scanned five times by chancing data entries. Data entries consist of weight and height of the phantom, injected dose, respective unit and injection time. After scans were completed, image reconstructions were performed for each of the data. Measured SUVmax depending on the type of data entry error was compared with the measured SUVmax of the orginal raw data. Also, the obtained SUVmax with retrospective change of data entries was compared with the measured SUVmax of the orginal raw data. The differences of measured SUVmax depending on the type of data entry error were statistically analyzed. Results: The differences between SUVmax measurements depending on the type of data entry error and the orginal raw data were statistically significant (p<0.05). But, the differences between SUVmax measurements obtained with the changes retrospective data entry errors and the orginal raw data were not statistically significant(p>0.05). Conclusion: Extreme care should be performed while entering patient information in PET/CT imaging. Errors in patient data entry will result as false SUVmax measurements, which could potentially alter patient management.