Image Intensifier

The standard image intensifier is 9"/6". Most systems built after mid-90s have tri-mode IIs with 9"/6"/4.5" IIs.  When considering field of view, it can be said that the smalles, 4.5" is not clinically necessary and not worth the trade-off of higher dose. Manufacturers use technical aspects of the camera and lens assembly in order to more efficiently provide an image, some resulting in comparatively lower dose in the 4.5 field of view.

Pulsed Fluoroscopy

The primary purpose of pulsed fluoro is for dose reduction. The secondary purpose is reduction of blurring while imaging moving anatomy. Some systems allow pulse mode to be used with higher mA values to improve image quality.