Radiation Therapy is a specialized field of oncology that uses high‑energy radiation to treat cancer by damaging the DNA of malignant cells. It is one of the most effective and widely used cancer treatments, often combined with surgery, chemotherapy, or immunotherapy.
Modern radiation therapy techniques allow precise targeting of tumors while minimizing exposure to surrounding healthy tissues.
Radiation therapy uses ionizing radiation—typically photons, electrons, or protons—to destroy cancer cells. Treatment planning involves CT simulation, contouring, dose calculation, and precise beam delivery using linear accelerators.
Techniques include 3D conformal radiation therapy (3D‑CRT), intensity‑modulated radiation therapy (IMRT), volumetric modulated arc therapy (VMAT), stereotactic radiosurgery (SRS), and stereotactic body radiation therapy (SBRT).
Proton therapy offers highly targeted treatment with reduced exit dose, making it ideal for pediatric and sensitive‑area tumors.
Source: American Society for Radiation Oncology
Radiation therapy is used to cure cancer, control tumor growth, relieve symptoms, and prevent recurrence. It is essential in treating breast cancer, prostate cancer, lung cancer, brain tumors, lymphomas, and many other malignancies.
Advanced imaging and motion‑management systems allow precise delivery even in moving organs such as the lungs and liver.
Radiation therapy is also used for non‑cancer conditions such as trigeminal neuralgia and benign tumors.
Source: National Cancer Institute
3D‑CRT
IMRT / VMAT
SBRT / SRS
Low‑Dose Rate (LDR)
High‑Dose Rate (HDR)
Permanent Seed Implants
Proton Therapy
Carbon‑Ion Therapy
Reduced exit dose
Source: ASTRO
Radiation therapy centers follow accreditation standards from ASTRO, ACR, and the American College of Radiation Oncology (ACRO). These standards ensure safe treatment delivery, accurate dose calculation, and quality assurance.
Quality control includes daily linear accelerator checks, imaging system calibration, and treatment plan verification.
Source: ACR / ASTRO
Is radiation therapy safe? Yes. Treatments are carefully planned to minimize exposure to healthy tissues.
How long does treatment take? Most sessions last 10–20 minutes.
Does radiation therapy hurt? No. The treatment itself is painless.
Source: National Cancer Institute
Radiation therapists require training in oncology, radiation physics, anatomy, patient positioning, and treatment planning. Certification is available through ARRT.
Students learn to operate linear accelerators, perform simulations, and ensure patient safety.
Source: ASRT