Pulmonary abnormalities in immunocompromised patients: comparative detection with parallel acquisition MR imaging and...

Area of Science:

• Radiology
• Medical Imaging

Background:

• Immunocompromised patients are susceptible to pulmonary infections.
• Accurate depiction of pulmonary abnormalities is crucial for timely diagnosis and treatment.

Purpose of the Study:

• To compare parallel acquisition MR imaging with thin-section helical CT for diagnosing pneumonia in immunocompromised patients.
• Evaluate the efficacy of MR imaging in detecting and characterizing pulmonary abnormalities.

Main Methods:

• Thirty neutropenic patients underwent breath-hold single-shot half-Fourier turbo spin-echo MR imaging with generalized autocalibrating partially parallel acquisition (GRAPPA).
• Thoracic CT (4 x 1 mm) served as the reference standard.
• Pulmonary abnormalities were analyzed by three blinded readers for location, distribution, and characteristics.

Main Results:

• MR imaging correctly diagnosed pneumonia in 95% of patients with abnormalities detected by CT.
• Sensitivity was 95%, specificity 88%, positive predictive value 95%, and negative predictive value 88%.
• No significant difference was found in lesion location and distribution between MR imaging and CT.

Conclusions:

• Fast MR imaging with parallel acquisition (GRAPPA) is nearly as effective as CT for detecting pulmonary abnormalities suggestive of pneumonia.
• MR imaging has a slight disadvantage in characterizing specific internal features, such as cavitations, compared to CT.