Accreditation: This course is accredited by ASRT - an approved continuing education provider of ARRT.
Release Date: 7/1/2016
Expiration Date: 7/31/2019

PET/CT: Optimizing Imaging Protocols to Reduce Radiation Exposure

Linda Giering, PhD

*Medical Writer, Matawan, New Jersey.

Address correspondence to: Linda Giering, PhD. E-mail:
Disclosure statement: The author reports having no significant financial or advisory relationships with corporate organizations related to this activity.




The development of positron-emission tomography (PET) combined with computed tomography (CT), PET/CT, with near simultaneous acquisition capability has addressed the limited spatial resolution of PET and improved the anatomical localization of radiotracer uptake detected by PET. The combined imaging modality allows for CT-based attenuation correction of the PET emission scans, improving image quality and decreasing scan time and diagnostic CT examinations. Studies have shown that PET/CT is more accurate, more sensitive, and more specific than either modality alone. These benefits, however, come at the expense of increased radiation dose to the patient. PET/CT scanners are widely used and have almost totally replaced standalone PET systems. Optimized protocols to reduce dose while maintaining sufficient image quality as well as careful patient selection are important to avoid unnecessary exposure and to ensure high-quality images to inform clinical management decisions when a PET/CT study is needed. It is important to always consider ways to reduce radiation dose without compromising diagnostic quality.

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