Overview

A collimator restricts the x ray beam to the area of clinical interest to reduce dose and improve image quality. Adjustable shutters and light field alignment aid positioning. Proper collimation reduces scatter and enhances contrast.

Types and Controls

Manual and motorized collimators offer different workflow and precision options. Light field and laser alignment assist in accurate positioning. Collimator calibration is part of routine QA.

Clinical Impact

Tight collimation reduces patient dose and improves diagnostic detail. Over collimation can exclude anatomy of interest and require repeat imaging. Training ensures technologists balance coverage and dose.

Maintenance

Collimator blades and light sources require inspection and replacement as needed. Alignment checks verify congruence between light and x ray fields. Documentation of maintenance supports regulatory compliance.