Choose Your Collimator Wisely: Inappropriate Collimator Selection During a177Lu-DOTATATE Posttreatment Scan

Proper collimator selection is critical to obtaining high-quality, inter-pretable nuclear medicine images. Collimators help eliminate scatter, which leads to poor spatial resolution and blurry images. We present the case of a posttherapy 177 Lu-DOTATATE (Lutathera) patient who was initially imaged with a low-energy, high-resolution collimator routinely used in 99m Tc imaging. On image review, the patient was reimaged with the appropriate medium-energy, high-resolution collimator, which resulted in improved image quality. When reviewing the quality of images, it is important to understand modi fi cations to the imaging that can signi fi cantly improve image quality and interpretation.