LINEAR ACCELERATOR
A medical linear accelerator (LINAC) customizes high-energy x-rays or electrons to match the shape of a tumor, effectively eradicating cancer cells while preserving nearby healthy tissue. It incorporates multiple safety features to guarantee precise dose delivery and undergoes regular evaluation by a medical physicist to confirm its proper functioning.
If you have a scheduled radiation therapy session utilizing a LINAC, your radiation oncologist will collaborate with a radiation dosimetrist and a medical physicist to formulate a treatment plan. This plan undergoes thorough verification before treatment commencement, and quality assurance procedures are employed to ensure consistent and accurate delivery of each treatment.
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FREQUENTLY ASKED QUESTION
What is the purpose of a medical linear accelerator (LINAC)?
A LINAC is primarily used for external beam radiation treatments in cancer patients. It delivers high-energy x-rays or electrons to target a patient’s tumor while minimizing damage to surrounding healthy tissue. Various techniques such as IMRT, VMAT, IGRT, SRS, and SBRT can be employed for treatment.
How does a linear accelerator function?
Utilizing microwave technology, the linear accelerator accelerates electrons and directs them to collide with a heavy metal target, producing high-energy x-rays. These x-rays are shaped to match the tumor’s contours and are delivered to the patient through a moveable treatment couch. The machine’s gantry, rotating around the patient, allows radiation to be delivered from different angles.
Who operates the linear accelerator?
The radiation oncologist prescribes the treatment, while the medical physicist and dosimetrist determine the delivery parameters. Radiation therapists operate the linear accelerator, administering daily treatments to patients.
How is safety ensured during treatment?
Safety measures include developing and double-checking treatment plans, daily machine checks by radiation therapists, and monthly/annual detailed checks by medical physicists. The linear accelerator incorporates systems preventing delivery of higher doses than prescribed. Continuous monitoring during treatment, closed-circuit TV observation, and regular checks of beam position contribute to patient safety. Staff safety is maintained with lead and concrete shielding, and the accelerator can only emit radiation when intentionally activated, minimizing accidental exposure risks.
