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Purpose <p>The aim of this study was to investigate the influences of tube voltage combinations on the axial dose distribution in abdominal dual-energy computed tomography (DECT) acquisition and image quality of virtual monochromatic imaging (VMI).</p> Methods <p>Volumetric CT dose indices (CTDI<sub>vol</sub>) were measured at 120&#xa0;kV and four DE (70/Sn150, 80/Sn150, 90/Sn150, and 100/Sn150 kV) acquisitions. Air kerma in 120&#xa0;kV and four DE acquisitions were measured at 19 points in a medium-sized adult abdominal phantom with holes for inserting a pencil ionization chamber. A multi-energy CT phantom with its extension ring was acquired to obtain low-contrast object-specific contrast-to-noise ratio (CNR<sub>LO</sub>) and figure of merit (FOM) of VMI at 40, 50 and 70&#xa0;keV.</p> Results <p>The differences between measured and displayed CTDI<sub>vol</sub> among all the tube voltages were within 5%. Air kerma in both the peripheral and central regions tended to be higher for DE acquisition than at 120&#xa0;kV for the abdominal phantom. As the tube voltage on the lower tube voltage side decreased, the air kerma increased in the peripheral region of the phantom, especially in the ventral region. In the central region of the phantom, there was no significant difference among tube voltage combinations. At 50 and 70&#xa0;keV, the CNR<sub>LO</sub> and FOM at 100/Sn150 kV was the highest.</p> Conclusions <p>Air kerma to superficial organs and image quality of VMI are influenced by the tube voltage combination, and both CNR<sub>LO</sub> and FOM are higher at 100/Sn150 kV than at other tube voltage combinations.</p>

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Axial dose distribution and image quality of virtual monochromatic imaging for optimization of tube voltage combinations in abdominal dual-energy computed tomography examinations: a phantom study

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Ayaka Hirosawa,
  • Kosuke Matsubara,
  • Yusuke Morioka,
  • Atsushi Fukuda

摘要

Purpose

The aim of this study was to investigate the influences of tube voltage combinations on the axial dose distribution in abdominal dual-energy computed tomography (DECT) acquisition and image quality of virtual monochromatic imaging (VMI).

Methods

Volumetric CT dose indices (CTDIvol) were measured at 120 kV and four DE (70/Sn150, 80/Sn150, 90/Sn150, and 100/Sn150 kV) acquisitions. Air kerma in 120 kV and four DE acquisitions were measured at 19 points in a medium-sized adult abdominal phantom with holes for inserting a pencil ionization chamber. A multi-energy CT phantom with its extension ring was acquired to obtain low-contrast object-specific contrast-to-noise ratio (CNRLO) and figure of merit (FOM) of VMI at 40, 50 and 70 keV.

Results

The differences between measured and displayed CTDIvol among all the tube voltages were within 5%. Air kerma in both the peripheral and central regions tended to be higher for DE acquisition than at 120 kV for the abdominal phantom. As the tube voltage on the lower tube voltage side decreased, the air kerma increased in the peripheral region of the phantom, especially in the ventral region. In the central region of the phantom, there was no significant difference among tube voltage combinations. At 50 and 70 keV, the CNRLO and FOM at 100/Sn150 kV was the highest.

Conclusions

Air kerma to superficial organs and image quality of VMI are influenced by the tube voltage combination, and both CNRLO and FOM are higher at 100/Sn150 kV than at other tube voltage combinations.