Course Content
Introduction to Colorectal Cancer
Learn about the causes, symptoms, risk factors, prevention, treatment, and management of colorectal cancer. By the end of this course, you will have a better understanding of colorectal cancer and how to prevent, detect, and manage it.
Not Just A Gut Feeling: Understanding Colorectal Cancer
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How is radiation therapy administered?

In Singapore, radiation therapy techniques and delivery methods for colorectal cancer are advanced and follow international standards. Here are some commonly used techniques and delivery methods:

External Beam Radiation Therapy (EBRT):

EBRT is the most common type of radiation therapy for colorectal cancer. It involves delivering radiation to the tumor from outside the body using a machine called a linear accelerator.


3D-Conformal Radiation Therapy (3D-CRT). This technique shapes the radiation beams to match the shape of the tumor, minimizing radiation exposure to healthy tissues.

Intensity-Modulated Radiation Therapy (IMRT). IMRT delivers precise radiation doses to the tumor using multiple beams that vary in intensity. This technique further reduces radiation exposure to surrounding healthy tissues.

Delivery Methods

Image-Guided Radiation Therapy (IGRT). IGRT utilizes imaging techniques, such as CT scans or X-rays, to precisely target the tumor and adjust the radiation beams based on real-time images.

Volumetric Modulated Arc Therapy (VMAT). VMAT is a more advanced form of IMRT that delivers radiation in a continuous arc while continuously adjusting the intensity and shape of the beams.

Stereotactic Body Radiation Therapy (SBRT):

SBRT delivers high doses of radiation to the tumor in a few treatment sessions using highly precise techniques.


Stereotactic Radiosurgery (SRS). SRS is used for small colorectal cancer metastases in the liver or other organs. It delivers a high dose of radiation in one or a few sessions.

Stereotactic Body Radiation Therapy (SBRT). SBRT is used to treat primary tumors or larger metastases outside the brain. It delivers radiation with extreme accuracy over a few treatment sessions.

Delivery Methods

Image guidance and motion management techniques are employed to ensure precise targeting of the tumor, taking into account any movement during treatment.

Who performs radiation therapy?

    Radiation therapy in Singapore is typically performed by a multidisciplinary team, including radiation oncologists, medical physicists, radiation therapists, and other healthcare professionals. The choice of technique and delivery method depends on the specific characteristics of the tumor, patient’s health condition, and treatment goals.

    Prior to radiation therapy, a planning process is conducted, which includes imaging scans, simulation, and treatment planning. The radiation oncology team works together to develop a personalized treatment plan, ensuring that the radiation is accurately delivered to the tumor while minimizing exposure to surrounding healthy tissues.

    It’s important to note that the specific techniques and delivery methods used may vary depending on the individual treatment facilities and the patient’s specific needs. Your healthcare team will determine the most appropriate radiation therapy approach based on your unique circumstances.