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Abdominal tumors due to malignancy in the liver often occurred in Abdomen CT Scan patients. To obtain a good and accurate image quality can be done by setting the scan delay and windowing. The purpose of this study is to determine the values that fulfilled the radiation protection aspects. This research is quantitative research with the experimental approach the research is done in Telogorejo Hospital in Semarang by using 40 samples with 5 scan delay times (60; 65; 70; 75; 80 seconds). The results calculated by ROI on the object and analyzed by Friedman tests. The results showed a difference in image quality (p-value = 0.02). The results of dose calculations showed an increase in dose for each additional scan delay time. This is consistent with the results of statistical tests (y = 1,181x + 20,025 with R² = 0.8506), which means that the dose increase is caused by scan time delay. Suggest for getting the optimal image quality with 70 seconds scan delay and the maximum scan delay with 75 seconds is still accepted for patients. The radiation dose is 24,54 mGy with maximum scan delay, which under the regulation of Bapeten and safe for the patients.