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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Related Experiment Video

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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration

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Quantifying thumb opposition kinematics using dynamic computed tomography.

F D Kerkhof¹, E Brugman², P D'Agostino¹

¹KU Leuven, Department of Development and Regeneration @ Kulak, Kortrijk, Belgium.

Journal of Biomechanics

|May 21, 2016

Summary

This summary is machine-generated.

Dynamic CT scanning accurately quantifies 3D thumb motion, overcoming limitations of current methods. This robust technique shows consistent thumb opposition kinematics in cadavers, paving the way for clinical use.

Keywords:

4D CT HAM Medical imaging STT TMC Trapeziometacarpal joint

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Area of Science:

Orthopedics
Biomechanics
Medical Imaging

Background:

Current 3D motion capture methods have limitations for evaluating thumb base motion.
Dynamic CT offers potential but requires validation in multiple specimens.

Purpose of the Study:

To evaluate dynamic CT for robust 3D quantitative assessment of thumb motion.
To test a clinically feasible protocol in a larger cadaveric study.

Main Methods:

Acquired dynamic CT scans of six cadaveric forearms during simulated thumb opposition.
Quantified carpal bone motion using helical axes and determined intersection points for comparison.
Assessed precision by measuring bead distance variations and absolute deviations.

Main Results:

Dynamic CT precision was 0.43mm (skin) and 0.13mm (bone), with absolute deviations ≤0.34mm.
Demonstrated and quantified thumb opposition involves motion at the trapeziometacarpal and scaphotrapezoidal joints.
Observed high consistency in motion patterns across specimens with limited radiation dose.

Conclusions:

Dynamic CT is a viable and precise method for visualizing and quantifying 3D thumb kinematics.
This technique shows promise for in vivo kinematic studies of the thumb.
The study validates dynamic CT for robust thumb motion analysis in a clinical context.