Collimators constitute a critical component of the imaging system and have a direct effect on image quality. Therefore ensuring collimator integrity is vital for quality assurance in nuclear cardiology. Routine checks should be performed on all collimators in clinical use (Table 1). Extrinsic flood images provide an assessment of collimator uniformity and should be acquired at regular intervals. Technologists must be conscious of unintended damage to the collimators and other related issues that might cause artifacts in nuclear cardiology images, keeping in mind that damage could occur off-hours by nontechnologists.
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