What is the typical mA in scout scan parameters for PET imaging?

In PET imaging, the scout scan, also known as a localizer or scout view, is primarily performed to aid in the proper positioning of the patient and to define the area of interest for the subsequent emission scanning. The typical milliampere (mA) settings for the scout scan are generally lower than those used in diagnostic x-ray imaging.

Using 50 mA for the scout scan strikes a balance between obtaining a sufficient signal while minimizing patient exposure to radiation. This parameter allows for an adequate image for proper alignment and scouting without the need for the higher exposures that are used during full diagnostic scans.

Lower mA settings are appropriate in this phase because the primary goal is alignment, as opposed to image quality, which is more critical during the actual PET scan. Consequently, selecting 50 mA as the typical value reflects a standard practice in the field, making it a suitable choice for the scout scan parameters in PET imaging.