What dose does a low-dose CT typically contribute to a PET/CT scan?

In the context of a PET/CT scan, the low-dose CT component is designed primarily for attenuation correction and anatomical localization rather than for diagnostic imaging, which is why it can be performed at a lower radiation dose compared to conventional diagnostic CT scans.

The typical contribution of the low-dose CT to the overall radiation dose in a PET/CT scan is generally around 1.3 mSv. This dose is carefully calculated to be as low as reasonably achievable (ALARA) while still providing sufficient information for the PET scan.

Understanding the radiation dose from a low-dose CT is essential for healthcare providers and patients alike, as it helps in evaluating the risks and benefits associated with imaging procedures. The method of measurement and the technology used in the PET/CT system influence this dose, along with protocols aimed at minimizing radiation exposure. This concept is vital in the field of radiology and nuclear medicine, especially with increasing concerns about radiation safety.