Precision and accuracy of the dynamic endocast method for measuring volume changes in XROMM studies

Area of Science:

• Biomechanics
• Comparative Anatomy
• Functional Morphology

Background:

• X-ray Reconstruction of Moving Morphology (XROMM) provides precise 3D skeletal kinematics for animal behaviors.
• The dynamic endocast method builds on XROMM to quantify volume changes within defined regions.
• Accurate measurement of volumetric changes is crucial for understanding physiological processes and behavioral mechanics.

Purpose of the Study:

• To assess the precision and accuracy of the dynamic endocast method for measuring volume change rates.
• To investigate the influence of methodological variables (alpha value, locator number) on accuracy.
• To establish the generalizability of findings regarding volume change estimation.

Main Methods:

• Utilized the dynamic endocast method on a fish oropharyngeal cavity model.
• Quantified the rate of volume change within the oropharyngeal cavity during simulated behaviors.
• Systematically varied parameters like alpha value and locator number to test their impact on accuracy.

Main Results:

• The dynamic endocast method demonstrated high accuracy in measuring the rate of volume change.
• Instantaneous absolute volume measurements were overestimated.
• The method consistently underestimated the rate of volume change, yielding conservative results.

Conclusions:

• The dynamic endocast method is a valuable tool for accurately assessing volumetric rate changes in biological systems.
• Underestimation of volume change rates suggests a conservative approach, which may be advantageous in certain applications.
• The findings regarding underestimation are likely generalizable across different applications of the dynamic endocast method.