Ces radiol. 2015, 69(3):187-193 | DOI: 10.55095/CesRadiol2015/029

Inter-scanner comparison of radiation dose and image quality in high-resolution CT of the lung in a single institutionOriginal article

Lukáš Lambert1, Lucie Šimáková1, Alena Lambertová2, Patrik Matras1, JiříVotruba3, Josef Hořejš1
1 Radiodiagnostická klinika 1. LF UK a VFN, Praha
2 Psychiatrická klinika 1. LF UK a VFN, Praha
3 I. klinika tuberkulózy a respiračních nemocí 1. LF UK a VFN, Praha

Aim: To compare radiation dose and image quality in HRCT of the lung among three scanners in a single institution.

Methods: HRCTs of the lung of fifty randomly selected patients per scanner in a single institution (Somatom Definition AS [SD], Somatom Emotion [SE], Brilliance iCT [iCT]) were evaluated. Reconstructions were performed with a standard soft-tissue (mediastinal) and high-resolution (HRCT) reconstruction algorithms. The image quality was measured as a standard deviation of the density in the trachea, left atrium, and aorta and evaluated on a four-point Likert scale. A phantom, that was constructed according to the real patient data, was scanned with five different levels of the tube current.

Results: In the soft-tissue reconstruction, the image quality expressed as standard deviation of density was significantly better in the SD compared to SE (p = 0.0060) and there was no difference in subjective ratings of the image quality (p = 0.11). In HRCT reconstruction, the image quality was significantly better in iCT compared to SD (p = 0.0003) but the ratings were worse by a third of a point (p = 0.028). The average radiation dose estimate was 2.6 times (SD) and 1.9 times (SE) higher compared to iCT (p < 0.0001).

Conclusion: A significant difference in radiation dose estimate in HRCT of the lung among three different scanners was demonstrated. Between the two scanners with the highest and the lowest radiation dose, only a minimal difference in subjective evaluation of image quality was found, which is probably due to optimization and established practice.

Keywords: computed tomography, radiation dose, thorax

Accepted: September 9, 2015; Published: September 1, 2015  Show citation

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Lambert L, Šimáková L, Lambertová A, Matras P, JiříVotruba, Hořejš J. Inter-scanner comparison of radiation dose and image quality in high-resolution CT of the lung in a single institution. Ces radiol. 2015;69(3):187-193. doi: 10.55095/CesRadiol2015/029.
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