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Purpose:  The aim of this work was to establish the relationships of patient size in terms of effective diameter (D eff ) and water-equivalent diameter (D w ) with lateral (LAT) and anterior-posterior (AP) dimensions in order to predict the specific patient dose for thoracic, abdominal, and pelvic computed tomography (CT) examinations. Methods:  A total of 47 thoracic images, 79 abdominal images, and 50 pelvic images were analyzed in this study. The patient’s images were retrospectively collected from Dr. Kariadi and Kensaras Hospitals, Semarang, Indonesia. The slices measured were taken from the middle of the scan range. The calculations of patient sizes (LAT, AP, D eff , and D w ) were automatically performed by IndoseCT 20b software. D eff  and D w  were plotted as functions of LAT, AP, and AP+LAT. In addition, D w  was plotted as a function of D eff . Results:  Strong correlations of D eff  and D w  with LAT, AP, and AP+LAT were found. Stronger correlations were found in the D eff  curves (R 2  &gt; 0.9) than in the D w  curves (R 2  &gt; 0.8). It was found that the average D eff  was higher than the average Dw in the thoracic region, the average values were similar in the abdominal and pelvic regions. Conclusion:  The current study extended the study of the relationships between D eff  and D w  and the basic geometric diameter LAT, AP, and AP+LAT beyond those previously reported by AAPM. We evaluated the relationships for three regions, i.e. thoracic, abdominal, and pelvic regions. Based on our findings, it was possible to estimate D eff  and D w  from only the LAT or AP dimension.

The effective and water-equivalent diameters as geometrical size functions for estimating CT dose in the thoracic, abdominal, and pelvic regions