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Lung nodule localization and size estimation on chest tomosynthesis.

Micael Oliveira Diniz1,2, Mohammad Khalil1, Erika Fagman1,2

  • 1University of Gothenburg, Sahlgrenska Academy, Institute of Clinical Sciences, Department of Radiology, Gothenburg, Sweden.

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|October 30, 2024
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Summary

Digital chest tomosynthesis (DTS) can visualize most lung nodules found on CT scans. Area-based measurements on DTS improve nodule size accuracy and reduce variability compared to mean diameter, with coronal CT-MIP aiding localization.

Keywords:
areadigital chest tomosynthesislung nodule measurementsmean diameter

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Area of Science:

  • Radiology and Medical Imaging
  • Pulmonary Medicine
  • Diagnostic Imaging Technology

Background:

  • Digital Chest Tomosynthesis (DTS) is an emerging imaging modality for lung nodule detection.
  • Accurate localization, visibility assessment, and precise measurement of lung nodules are crucial for patient management.
  • Comparison with Computed Tomography (CT) is essential to validate DTS performance.

Purpose of the Study:

  • To investigate the localization, visibility, and measurement accuracy of lung nodules using Digital Chest Tomosynthesis (DTS).
  • To compare the effectiveness of different Computed Tomography (CT) visualization techniques for nodule localization in DTS.
  • To evaluate nodule size measurement variability and accuracy on DTS.

Main Methods:

  • Five radiologists analyzed DTS and CT images from 24 participants.
  • Lung nodule localization, visibility, and measurement were assessed on DTS.
  • Coronal and transaxial CT-Maximum Intensity Projections (CT-MIP) were used to evaluate nodule localization.
  • Inter- and intra-observer agreement for nodule size was assessed using mean diameter and area-based measurements.

Main Results:

  • 79% of lung nodules were visible on DTS, though less distinct than on CT.
  • Coronal CT-MIP orientation facilitated superior lung nodule localization on DTS compared to transaxial.
  • Area-based nodule size estimates on DTS showed significantly less measurement variability and higher accuracy than mean diameter estimates.

Conclusions:

  • Coronal CT-MIP images enhance lung nodule localization on DTS.
  • Most lung nodules identified on CT are visualized, localized, and measurable using DTS.
  • Area-based measurement is key for precise and consistent nodule size assessment on DTS.