treatment field
Anatomic region targeted for radiation therapy delivery, defined by radiation treatment planning.
Full Definition
A treatment field is the precisely defined anatomic region that receives radiation dose during radiation therapy delivery. Treatment fields are carefully planned using imaging guidance to encompass the target volume while minimizing dose to surrounding normal tissues. Field design considers tumor location, size, shape, and proximity to critical structures. Modern radiation techniques may use multiple fields, intensity modulation, or arc delivery to optimize dose distribution. Imaging plays a crucial role in treatment field verification through portal imaging, cone-beam CT, and other guidance technologies. Accurate field definition and monitoring are essential for treatment efficacy and safety.
Usage
Usage note: Distinguish from clinical and planning target volumes in formal planning.
In Context
- "The treatment field encompassed the primary tumor with a 2-cm margin for setup uncertainty." — Radiation planning report
- "Daily imaging confirmed proper patient positioning within the planned treatment field." — Radiation delivery verification