Validation of diagnostic accuracy using digital slides in routine histopathology

Area of Science:

• Digital pathology
• Histopathology
• Medical imaging

Background:

• Advancements in digital microscopy tools for pathologists.
• Growing evidence supports the reliability of digital slides in routine diagnostics.
• Need for evaluation of scanning properties and diagnostic accuracy of digital slides.

Purpose of the Study:

• To evaluate scanning properties of digital slides.
• To assess diagnostic accuracy using digital slides compared to traditional methods.
• To analyze diagnostic coherency and uncertainty related to digital slides and scanning quality.

Main Methods:

• Retrospective comparative study of 306 cases.
• 8 pathologists reevaluated slides scanned with a 20× objective and 0.465 μm/pixel resolution.
• Analysis of diagnostic agreement, uncertainty, and scanning quality using database and viewer software on office PCs.

Main Results:

• 96% of slides showed good to excellent image quality.
• Poor image quality in critical cases was often due to section folds or floatings.
• 88.2% of digital diagnoses fully agreed with consensus, with only 2.3% relevant discrepancies.

Conclusions:

• Digital slide-based histopathological diagnoses are highly coherent with optical microscopy.
• Pathologist competency is more critical than digital slide quality for accuracy.
• Poor digital slide quality does not endanger patient safety due to pathologist recognition and corrective actions.