Why a Tighter Gamma Camera Energy Window Can Add Noise

A narrower gamma camera photopeak energy window rejects more lower-energy Compton-scattered photons; this improves contrast. Direct photons keep roughly their original energy, while scattered photons lose energy before reaching the detector.

• Target audience: radiology and nuclear medicine trainees reviewing gamma camera energy-window physics.
• Direct photons retain approximately their original energy; Compton-scattered photons lose energy before reaching the detector.
• A narrower photopeak window accepts fewer lower-energy scattered events, improving contrast.

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