beam arrangement techniques

Single Port

One radiation beam directed at the tumor.

Simple setup, but dose distribution is less conformal.

Used for superficial orpalliative treatments.

Cross-Fire Technique

Two beams from opposite directions (e.g., anterior-posterior).

Improves dose uniformity in the tumor, Reduces dose to tissues beyond the target.

Double Port

Two beams at right angles (eg: anterior, lateral)
better coverage than single port.
Useful for moderately deep tumors.

Quadrantic (Box Technique)

Four beams anterior posterior, and two

laterals,

creates a "box" of dose around the tumor very common for/pelvic tumors (e.g., cervical cancer)

Perpendicular Technique

Beams arranged at 90 degree angle
Similar to double port but emphasizes orthogonal geometry
Improves dose homogeneity.

Rotational Technique

Gantry rotates around the patient delivering dose continuously

Produces highly uniform dose distribution.

Used in techniques like are therapy and (VIMAT

Tangential Technique

Beams skim along the surface, entering and exiting at shallow angles.

Common in breast cancer radiotherapy to spare lung and heart.

provides good coverage of superficial targets

perficial