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3D Cine Magnetic Resonance Imaging of Respiratory Motion in Mechanically Ventilated Mice and Rats

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Respiratory magnetogram detected with a MEMS device.

Saul M Dominguez-Nicolas¹, Raul Juarez-Aguirre, Agustin L Herrera-May

¹1. Research Center for Micro and Nano Technology, Universidad Veracruzana, Calzada Adolfo Ruíz Cortines 455, 94294, Boca del Río, Ver., Mexico.

International Journal of Medical Sciences

|September 19, 2013

Summary

Researchers discovered that thoracic muscles generate a magnetic signal during breathing, termed the respiratory magnetogram. This finding, using a novel microelectromechanical systems sensor, opens new avenues for understanding physiological magnetic fields.

Keywords:

magnetocardiogram magnetometer.respiration ribs thoracic cage thoracic muscles

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Area of Science:

Biophysics
Biomedical Engineering
Physiology

Background:

Magnetic fields from the brain (magnetoencephalography) and heart (magnetocardiography) are established diagnostic tools.
The potential for magnetic signal generation by other organs, like muscles, remains largely unexplored.
Understanding bio-magnetic fields aids in developing novel diagnostic and research methodologies.

Purpose of the Study:

To investigate whether thoracic muscles produce detectable magnetic fields during respiratory activity.
To characterize the nature and magnitude of these magnetic signals.
To introduce a novel method for measuring such bio-magnetic signals.

Main Methods:

Utilized a compact magnetometer based on microelectromechanical systems (MEMS) with approximately 20 nT resolution.
Positioned the MEMS sensor within the thoracic cavity of anaesthetized and ventilated rats.
Recorded magnetic flux density changes correlated with respiratory cycles.

Main Results:

Demonstrated the first evidence of strong magnetic flux density generated by thoracic muscles during respiration.
Coined the term 'respiratory magnetogram' for this newly identified magnetic signal.
Recorded a distinct, rhythmic respiratory magnetogram with a magnitude of approximately 600 nT.

Conclusions:

Thoracic muscles actively produce a measurable magnetic field during breathing.
The respiratory magnetogram represents a novel physiological bio-magnetic signal.
This discovery may lead to new diagnostic approaches and a deeper understanding of respiratory physiology.