Ventilation/perfusion SPECT or SPECT/CT for lung function imaging in patients with pulmonary emphysema?

Area of Science:

• Nuclear Medicine
• Pulmonary Imaging
• Medical Physics

Background:

• Pulmonary emphysema significantly impacts lung function.
• Ventilation/perfusion (V/P) SPECT/CT is crucial for assessing lung disease.
• Attenuation correction (AC) is a standard technique in SPECT imaging.

Purpose of the Study:

• To evaluate the clinical utility of attenuation correction (AC) in V/P SPECT images.
• To determine if AC improves image analysis in patients with pulmonary emphysema.

Main Methods:

• Twenty-one pulmonary emphysema patients underwent V/P SPECT/CT.
• AC and non-AC V/P SPECT images were compared visually (Likert scale) and semiquantitatively (percentage counts).
• Statistical analysis included Spearman's rho correlation and Wilcoxon rank sum test.

Main Results:

• Visual analysis showed high conformity between AC and non-AC images.
• Semiquantitative analysis revealed excellent correlation for both perfusion (ρ = 0.986) and ventilation (ρ = 0.979).
• No significant differences were found in lobe-based counts between AC and non-AC images (p = 0.809).

Conclusions:

• Attenuation correction does not improve visual assessment of V/P SPECT images in emphysema.
• AC does not enhance semiquantitative analysis of lung lobe function in these patients.
• AC is not essential for V/P SPECT imaging in pulmonary emphysema evaluation.