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Purpose <p>This study evaluated the relationship between image quality level (IQL), radiation dose, image noise, and signal-to-noise ratio (SNR) in pediatric head CT, comparing energy-integrating detector CT (EID-CT) and photon-counting CT (PCCT) across age-specific phantoms.</p> Methods <p>Head CT scans of 1-, 5-, and 10-year-old anthropomorphic phantoms were performed across a range of IQLs on EID-CT and PCCT. For each IQL, radiation dose, image noise, and SNR were recorded and compared between the two systems.</p> Results <p>PCCT required lower CTDI<sub>vol</sub> across all phantoms (<i>p</i> &lt; 0.05). In the clinically relevant IQL-range (IQL 200–300) the 10-year-old phantom showed the greatest relative radiation dose reduction using PCCT (9%), compared to 0.45% in the 1-year-old phantom. Organ doses were highest in the 1-year-old phantom for red bone marrow and skin with no significant differences between the two systems. PCCT offered significantly higher SNR than EID-CT for brain parenchyma (<i>p</i> &lt; 0.03) and bone (<i>p</i> = 0.012). Image noise was significantly lower in PCCT for brain parenchyma in the 1- and 5-year-old phantoms (<i>p</i> &lt; 0.03) and for bone in the 1-year-old phantom (<i>p</i> = 0.012). Over the full IQL-range (1-300) the average SNR was up to ~ 20% higher for brain parenchyma and ~ 50% higher for bone with PCCT than with EID-CT for all phantoms.</p> Conclusion <p>PCCT offers superior SNR for brain and bone while reducing radiation dose, with the largest radiation dose benefit in older pediatric phantoms, supporting optimized pediatric neuroimaging.</p>

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Radiation dose and signal-to-noise ratio in pediatric head CT: a phantom study comparing photon-counting and energy-integrating detectors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月20日

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  • Laura Valentina Klüner,
  • Sebastian Zensen,
  • Hannah Peuster,
  • Raya Ocker-Serger,
  • Marcel Drews,
  • Denise Bos,
  • Cornelius Deuschl,
  • Lale Umutlu,
  • Michael Forsting,
  • Johannes Haubold,
  • Marcel Opitz

摘要

Purpose

This study evaluated the relationship between image quality level (IQL), radiation dose, image noise, and signal-to-noise ratio (SNR) in pediatric head CT, comparing energy-integrating detector CT (EID-CT) and photon-counting CT (PCCT) across age-specific phantoms.

Methods

Head CT scans of 1-, 5-, and 10-year-old anthropomorphic phantoms were performed across a range of IQLs on EID-CT and PCCT. For each IQL, radiation dose, image noise, and SNR were recorded and compared between the two systems.

Results

PCCT required lower CTDIvol across all phantoms (p < 0.05). In the clinically relevant IQL-range (IQL 200–300) the 10-year-old phantom showed the greatest relative radiation dose reduction using PCCT (9%), compared to 0.45% in the 1-year-old phantom. Organ doses were highest in the 1-year-old phantom for red bone marrow and skin with no significant differences between the two systems. PCCT offered significantly higher SNR than EID-CT for brain parenchyma (p < 0.03) and bone (p = 0.012). Image noise was significantly lower in PCCT for brain parenchyma in the 1- and 5-year-old phantoms (p < 0.03) and for bone in the 1-year-old phantom (p = 0.012). Over the full IQL-range (1-300) the average SNR was up to ~ 20% higher for brain parenchyma and ~ 50% higher for bone with PCCT than with EID-CT for all phantoms.

Conclusion

PCCT offers superior SNR for brain and bone while reducing radiation dose, with the largest radiation dose benefit in older pediatric phantoms, supporting optimized pediatric neuroimaging.