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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.
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Related Experiment Video

Updated: Mar 2, 2026

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation

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SU-E-J-159: Electromagnetic Tracking during 4DCT.

J Mcgary^1,2, J Chen^1,2, Z Xiong^1,2

¹University of Houston, Houston, Tx.

Medical Physics

|May 19, 2017

Summary

This summary is machine-generated.

A new method accurately tracks tumor positions in real-time during 4D CT scans using electromagnetic fields and simple search coils, overcoming eddy current interference for improved cancer treatment.

Keywords:

Cancer Eddies Electric measurements Magnetic field measurements Magnetic field sensors Magnetic fields Maxwell equations Tracking devices

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Area of Science:

Medical Physics
Electromagnetism
Medical Imaging

Background:

Real-time electromagnetic tumor tracking during 4D CT (four-dimensional computed tomography) is a significant challenge.
Eddy currents generated by alternating magnetic fields in conductive materials interfere with accurate tracking.

Purpose of the Study:

To develop a novel method for separating source magnetic fields from background eddy currents.
To enable precise electromagnetic tumor localization using simple search coil sensors.

Main Methods:

Electromagnetic simulations using ANSYS Maxwell modeled the gantry and transponder.
A 5x5 array of search coils was configured to detect magnetic fields.
An algorithm was developed to calculate transponder position within the gantry, accounting for eddy currents.

Main Results:

The developed method achieved transponder localization accuracy within 1 mm across various positions and gantry lengths.
Gradient techniques did not significantly improve localization accuracy.
Complex solutions were identified but deemed unsuitable for clinical use.

Conclusions:

The proposed method enables accurate localization of Calypso® Beacon transponders for real-time tumor tracking during 4DCT.
The system utilizes cost-effective search coils, maintaining source-sensor proximity.
Future work involves system development and clinical implementation studies.