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Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent

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Flow compensated quantitative susceptibility mapping for venous oxygenation imaging.

Bo Xu¹, Tian Liu, Pascal Spincemaille

¹Department of Radiology, Weill Cornell Medical College, New York, New York, USA; Department of Biomedical Engineering, Cornell University, Ithaca, New York, USA.

Magnetic Resonance in Medicine

|September 6, 2013

Summary

This study introduces a flow-compensated quantitative susceptibility mapping (QSM) method to accurately measure venous oxygen saturation in the brain. The improved technique corrects for flow-induced errors, enhancing brain oxygen consumption analysis.

Keywords:

QSM adaptive-quadratic fit susceptibility venous oxygen saturation

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Area of Science:

Medical Imaging
Neuroscience
Biophysics

Background:

Venous blood oxygen saturation reflects brain oxygen consumption.
Quantitative susceptibility mapping (QSM) estimates oxygen saturation from MR phase signals.
Flow-induced phase and field gradients can affect QSM accuracy.

Purpose of the Study:

To correct flow-induced errors in QSM.
To improve the accuracy of venous oxygenation quantification.
To enable reliable in vivo measurement of brain venous oxygen saturation.

Main Methods:

Utilized a fully flow-compensated multi-echo gradient echo sequence for data acquisition.
Employed a quadratic fit of phase with respect to echo time to correct for flow phase.
Validated the method using phantom and in vivo human experiments.

Main Results:

Phantom experiments showed reduced errors in field and susceptibility maps.
In vivo human imaging demonstrated improved quantitative susceptibility maps.
The method enhanced the accuracy of estimated venous oxygen saturation values.

Conclusions:

Flow-compensated multi-echo acquisition and adaptive-quadratic phase fitting improve QSM for blood flow.
Enhanced vein susceptibility measurements enable accurate in vivo venous oxygen saturation quantification.
This technique offers a more reliable approach for assessing brain oxygen metabolism.