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Purpose <p>The purpose of this study was to validate the accuracy of a method for determining the iodine contrast dose using effective diameter (D<sub>eff</sub>) when performing dynamic computed tomography (CT) scans of the upper abdomen in patients with unknown body weight (BW).</p> Methods <p>D<sub>eff</sub> was measured at the heart, at the right diaphragm upper edge, and at the right pulmonary rib diaphragm levels in the localizer radiograph and axial images. Correlation coefficients between D<sub>eff</sub> and BW were determined for each cross section.</p> Results <p>D<sub>eff_axial</sub> and BW showed the highest correlation at the right diaphragm upper edge level in men (r<sub>S</sub> = 0.862) and at the right pulmonary rib diaphragm level in women (r<sub>S</sub> = 0.890).</p> Conclusions <p>The BW estimated from D<sub>eff</sub> showed a strong correlation with measured BW and may serve as a practical alternative in cases where BW is unknown.</p>

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Contrast dose determination using effective diameter in patients of unknown weight for dynamic computed tomography of the upper abdomen: a feasibility study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月19日

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  • Masaaki Fukunaga,
  • Shota Ichikawa,
  • Koki Ichijiri,
  • Osamu Ito,
  • Takafumi Moriya,
  • Yuki Yamaguchi

摘要

Purpose

The purpose of this study was to validate the accuracy of a method for determining the iodine contrast dose using effective diameter (Deff) when performing dynamic computed tomography (CT) scans of the upper abdomen in patients with unknown body weight (BW).

Methods

Deff was measured at the heart, at the right diaphragm upper edge, and at the right pulmonary rib diaphragm levels in the localizer radiograph and axial images. Correlation coefficients between Deff and BW were determined for each cross section.

Results

Deff_axial and BW showed the highest correlation at the right diaphragm upper edge level in men (rS = 0.862) and at the right pulmonary rib diaphragm level in women (rS = 0.890).

Conclusions

The BW estimated from Deff showed a strong correlation with measured BW and may serve as a practical alternative in cases where BW is unknown.