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Radiation Oncology

Stereotactic Radiosurgery (SRS)

Stereotactic radiosurgery (SRS) is a radiation treatment for small inoperable intracranial lesions with high precision using advanced imaging (MRI) and multiple convergent radiation beams through an arc or sphere. Radiation is delivered with the treatment couch in static or angled positions to ensure the targeted disease as the focal point. SRS technology is employed in the treatment of acoustic neuroma, arteriovenous malformations, cerebral metastases, trigeminal neuralgia, pituitary/pineal tumors, and meningiomas. In our department we employ two SRS technologies, Gamma Knife (Cobalt as the radiation source) via the most recent models with an attached CT scanner (ICON Gamma Knife unit) and linac-based SRS via the Elekta Versa HD linac with robotic couch. Either technique can be delivered as either a single treatment or through multiple treatments, with and without a head immobilization frame for improved effectiveness. At Froedtert & the Medical College of Wisconsin, the first linac based frameless SRS treatment was delivered in June 2025. It involved MRI based treatment planning, Versa HD linac with cone beam CT and a robotic couch and surface-guided (VisionRT) motion monitoring.

Elekta Esprit
Leksell Gamma Knife® Icon™

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Gamma Planner

Gamma Knife planning using Leksell GammaPlan treatment planning system, with oncologist and physicist reviewing the treatment plan.

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Medical oncologist and physicists verifying patient positioning for the stereotactic radiosurgery treatment for brain lesions.

Medical oncologist and physicists verifying patient positioning for the stereotactic radiosurgery treatment for brain lesions.

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Gamma Knife_Patient

Two medical physicists are setting up the mask on the patient.

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Gamma Knife ICON

Gamma Knife ICON

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