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Related Experiment Videos

Tests for evaluating laser film digitizers

R J Meeder1, D A Jaffray, P Munro

  • 1London Regional Cancer Centre, Ontario, Canada.

Medical Physics
|May 1, 1995
PubMed
Summary

Simple tests reveal issues with laser film digitizers, including geometric inaccuracies and noise. These problems can lead to erroneous quantitative measurements, highlighting the need for regular digitizer performance testing.

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Area of Science:

  • Medical Imaging
  • Image Processing

Background:

  • Laser film digitizers are crucial for medical image analysis.
  • Evaluating their performance is essential for accurate diagnostic results.

Purpose of the Study:

  • To develop and apply simple tests for evaluating laser film digitizer image transfer characteristics.
  • To assess the performance of a specific laser film digitizer model (Konica KFDR-S).

Main Methods:

  • Developed tests for geometric accuracy, characteristic curve linearity, temporal/spatial response, and added noise.
  • Utilized readily available clinical materials for testing.
  • Evaluated the Konica KFDR-S laser film digitizer.

Main Results:

  • Identified minor geometric inaccuracies in the Konica digitizer.
  • Detected structural noise from a shading correction circuit.
  • Observed laser beam spread affecting optical density measurements, particularly for small, high-density structures.
  • Found that these issues could lead to erroneous quantitative results.

Conclusions:

  • The developed tests are simple, quick, and effective for assessing laser film digitizer performance.
  • The Konica KFDR-S exhibited several performance issues.
  • Problems identified may not be unique to the Konica digitizer.
  • Regular testing of laser film digitizers is recommended for reliable quantitative measurements.

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