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Related Concept Videos

Calibration Curves: Linear Least Squares01:20

Calibration Curves: Linear Least Squares

A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
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Related Experiment Video

Updated: Jun 25, 2026

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Enhancing Single-Plane Fluoroscopy: A Self-Calibrating Bundle Adjustment for Distortion Modeling.

Jackson Cooper1, Jacky C K Chow2, Derek Lichti1

  • 1Department of Geomatics Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.

Diagnostics (Basel, Switzerland)
|March 13, 2024
PubMed
Summary

This study introduces a self-calibrating bundle adjustment to correct geometric distortions in single-plane fluoroscopy. This method significantly improves image accuracy for medical diagnostics and surgical navigation.

Keywords:
3D point reconstructiongeometric distortion correctionquantitative measurementself-calibrationsingle-plane fluoroscopy

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Area of Science:

  • Medical Imaging
  • Geometric Calibration
  • Image Processing

Background:

  • Single-plane fluoroscopy systems are widely used clinically.
  • These systems are prone to geometric distortions from components, assembly, and magnetic fields.
  • Accurate geometric calibration is crucial for reliable quantitative analysis and diagnostics.

Purpose of the Study:

  • To investigate a self-calibrating bundle adjustment for correcting geometric distortions in fluoroscopic imaging.
  • To assess the impact of calibrated imagery on diaphragmatic motion analysis and hemidiaphragm paralysis diagnosis.
  • To explore the potential of calibrated imagery in surgical navigation.

Main Methods:

  • A controlled experiment using three Philips Easy Diagnost R/F Systems.
  • Collection of a highly redundant image network (18-22 images) of a target field with 121 pre-surveyed tantalum beads.
  • Application of bundle adjustment to estimate distortion coefficients and calibrate imagery.

Main Results:

  • The modeling process estimated five to eight distortion coefficients per system.
  • An 83-85% improvement in image point precision (model fit) was achieved.
  • An 85-95% improvement in 3D object reconstruction accuracy was observed after calibration.

Conclusions:

  • The self-calibrating bundle adjustment effectively corrects geometric distortions in single-plane fluoroscopy.
  • This calibration enhances the accuracy and reliability of fluoroscopic imaging.
  • Improved imaging quality has significant potential for medical diagnostics, treatment, and surgical navigation.