Time-resolved contrast-enhanced pulmonary MR angiography using sensitivity encoding (SENSE).

Yoshiharu Ohno¹, Hideaki Kawamitsu, Takanori Higashino

¹Department of Radiology, Kobe University Graduate School of Medicine, Kobe, Japan. yoshiharuohno@aol.com

Journal of Magnetic Resonance Imaging : JMRI

|February 21, 2003

Summary

This study found that a faster injection rate of gadolinium-based contrast agents improves signal-to-noise ratio (SNR) in pulmonary MRA. A 5 mL/second injection protocol yielded the best results for visualizing pulmonary circulation.

Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Imaging Physics

Background:

Sensitivity Encoding (SENSE) is an MRI technique that accelerates image acquisition.
Optimizing contrast agent administration is crucial for effective contrast-enhanced Magnetic Resonance Angiography (CE-MRA).

Purpose of the Study:

To investigate the relationship between gadolinium concentration and signal-to-noise ratio (SNR) in SENSE-accelerated MRI.
To determine the optimal bolus injection protocol for pulmonary circulation visualization using CE-MRA.

Main Methods:

Phantom studies analyzed the SNR of SENSE images across various gadolinium concentrations (0-100 mmol/L).
In vivo studies in volunteers compared CE-MRA protocols using different volumes and injection rates of gadolinium-based contrast agents (Gd-DTPA BMA).
Peak SNR in pulmonary parenchyma and SNR differences between pulmonary artery and vein were statistically evaluated.

Main Results:

SENSE images showed significantly lower SNRs and contrast-to-noise ratios compared to nonparallel imaging techniques.
A 5 mL/second bolus injection protocol resulted in significantly higher peak SNR in the pulmonary parenchyma and greater SNR differences between the pulmonary artery and vein.
A linear relationship was observed between gadolinium concentration and SNR on SENSE images.

Conclusions:

3D-CE-MRA utilizing SENSE demonstrates a linear correlation between gadolinium concentration and SNR.
A rapid bolus injection protocol is essential for achieving high spatial and temporal resolution in SENSE-based MRA of the pulmonary circulation.

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Time-resolved contrast-enhanced pulmonary MR angiography using sensitivity encoding (SENSE).

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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