Regional lung perfusion: assessment with partially parallel three-dimensional MR imaging.

Area of Science:

• Radiology
• Medical Imaging
• Pulmonary Medicine

Background:

• Assessing regional lung perfusion is crucial for diagnosing various pulmonary conditions.
• Traditional methods may have limitations in spatial and temporal resolution for detailed perfusion analysis.

Purpose of the Study:

• To evaluate the efficacy of partially parallel three-dimensional (3D) magnetic resonance (MR) imaging for assessing regional lung perfusion.
• To determine the diagnostic accuracy of this MR technique in identifying perfusion abnormalities in patients with suspected lung cancer or metastasis.

Main Methods:

• Utilized 3D gradient-echo MR imaging with partially parallel acquisitions in 7 healthy volunteers and 20 patients.
• Acquisition parameters included a fast low-angle shot sequence with an acceleration factor of two and a 1.5-second acquisition time.
• Data were analyzed for topographic and temporal perfusion distribution, and diagnostic performance was compared against radionuclide perfusion scintigraphy.

Main Results:

• Demonstrated higher signal-to-noise ratio (SNR) and shorter lag time to peak enhancement in gravity-dependent lung areas in volunteers.
• Achieved high sensitivity (88%-94%), specificity (100%), and accuracy (90%-95%) in detecting perfusion abnormalities in patients.
• Showed very good interobserver agreement (kappa = 0.86) and good to very good intermodality agreement (kappa = 0.69-0.83).

Conclusions:

• Partially parallel 3D MR imaging provides high spatial and temporal resolution for regional lung perfusion assessment.
• The technique exhibits high diagnostic accuracy for detecting perfusion abnormalities, making it a valuable tool in pulmonary diagnostics.