Interdigitation
Multileaf collimator leaf positioning technique where opposing leaves overlap to create complex field shapes and improve dose conformity.
Full Definition
Interdigitation refers to the strategic overlapping of multileaf collimator leaves from opposing banks to create intricate field shapes that better conform to target volumes. This technique allows for the creation of concave dose distributions and improved dose conformity around irregular target geometries. Proper interdigitation requires careful consideration of leaf transmission, penumbra effects, and potential dosimetric errors. The technique is fundamental to intensity-modulated radiation therapy and is governed by specific planning system algorithms and delivery constraints.
Usage
Usage note: Technical term specific to MLC-based treatment delivery.
In Context
- "Optimal interdigitation of MLC leaves achieved excellent dose conformity around the hippocampus." — Treatment planning report
- "The planning system constraints limited interdigitation to prevent excessive small field effects." — Planning protocol documentation