In radiation oncology, which technique is described as having intersecting multiple portals?

The technique described as having intersecting multiple portals in radiation oncology is known as stereotactic radiation therapy. This method utilizes highly focused radiation beams that converge on the tumor from various angles, allowing for precise targeting of the cancerous tissue while minimizing exposure to surrounding healthy tissues.

Stereotactic techniques, such as stereotactic body radiotherapy (SBRT) and stereotactic radiosurgery (SRS), are particularly effective for small and well-defined tumors, providing high doses of radiation in fewer treatment sessions. The intersecting multiple portals facilitate a concentrated dose of radiation on the tumor, enhancing the treatment's effectiveness.

This distinguishes stereotactic approaches from other methods such as conventional radiation therapy, which typically employs fewer angles and may not achieve the same level of precision or dose distribution. Additionally, surgical planning and direct beam therapy do not incorporate the multi-portal intersecting strategy that is characteristic of stereotactic techniques. Therefore, knowing the role of intersecting portals in enhancing precision elucidates why stereotactic is the correct choice in this context.