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Parameter Standard recommendation Camera type Large–field-of-view multidetector Energy peak 159 keV Energy window 10% Collimator Low-energy high-resolution Patient position Supine with arms down; head in an off-table head holder Camera position Centered over the head Injection-to-scan time 3–6 h Acquisition type Step-and-shoot or continuous Orbit 360° Orbit type Circular, with the smallest possible radius of rotation (11–15 cm) Matrix 128 × 128 Number of projections 120 (3°/projection) Time per projection 30–40 s In SPECT/CT protocols, the manufacturer’s recommendations are followed for the CT acquisition parameters.
