Radiology and radiation therapy are closely linked medical fields that both play a vital role in patient care, particularly in cancer diagnosis and treatment. However, despite their similarities, they are distinct in purpose, methods, training and day-to-day practice. Understanding the difference between radiology and radiation therapy is key if you are considering a career in either area or if you are simply trying to make sense of the professionals involved in your care journey.

What Is Radiology?

Radiology is a medical discipline focused on the use of imaging technology to diagnose and, in some cases, monitor the progress of disease. It encompasses a range of diagnostic imaging techniques, such as:

• X-rays

• Computed tomography (CT) scans

• Magnetic resonance imaging (MRI) scans

• Ultrasounds

• Positron emission tomography (PET) scans

These tools allow clinicians to visualise the internal structures of the body, often revealing issues that are not detectable by physical examination alone.

Professionals who practise in this field include radiographers, who perform imaging procedures, and radiologists, who are medical doctors trained to interpret the results. When people ask, “What is radiology?”, it’s essential to highlight that it is fundamentally diagnostic in nature. Radiologists do not treat disease directly but provide crucial insight that guides medical and surgical interventions.

What Is Radiation Therapy?

Radiation therapy, also known as radiotherapy, is a form of cancer treatment that uses targeted doses of high-energy radiation to destroy malignant cells. Unlike radiology, which is diagnostic, radiation therapy is entirely therapeutic.

Therapy can be administered in two main ways:

External beam radiation therapy: Delivers radiation from outside the body via specialised machines aimed directly at the tumour.

Internal radiation therapy (brachytherapy): Involves placing radioactive materials inside the body near or within the tumour.

The key professionals in this space are radiation therapists, who plan and deliver treatment in collaboration with radiation oncologists, physicists and oncology nurses. When someone asks “What is radiation therapy?”, the answer centres on treatment: the goal is to shrink tumours, manage symptoms and, in many cases, eradicate cancer.

Radiographer vs. Radiation Therapist

A major distinction lies in the careers themselves. A radiographer focuses on capturing diagnostic images. Their responsibilities include operating complex imaging equipment, ensuring image quality and assisting in diagnostic procedures. They typically work across various departments, including orthopaedics, neurology and emergency medicine.

In contrast, a radiation therapist works almost exclusively in oncology. Their day-to-day responsibilities include creating treatment plans, positioning patients, monitoring responses and maintaining safety protocols during high-dose radiation delivery.

Thus, differentiating a radiographer andvs. radiation therapist is not merely a question of tools or technology – it’s a difference in the medical journey. One diagnoses; the other treats.

Is Radiology Part of Cancer Treatment?

Yes, but not in a therapeutic sense. Radiology plays a critical role in the cancer treatment journey, particularly in:

• Diagnosing cancer through imaging such as CT, MRI and PET scans.

• Staging tumours to assess spread and severity.

• Monitoring treatment progress or recurrence post-treatment.

While radiologists themselves do not treat cancer, their findings directly inform the work of oncologists, surgeons and radiation therapists. Radiology is therefore part of cancer treatment, but not curative on its own.

Do Radiologists and Radiation Therapists Work in the Same Department?

While radiologists and radiation therapists may work within the broader oncology or diagnostic services of a hospital, they typically function in separate but related departments.

• Radiologists are generally based in medical imaging departments, interpreting scans and collaborating with multidisciplinary teams.

• Radiation therapists, on the other hand, work in radiation oncology departments, focusing on cancer treatment delivery.

In large healthcare facilities – such as Lenmed Ethekwini Hospital and Heart Centre or Bokamoso Private Hospital – these departments often collaborate closely, but they remain functionally distinct.

Which Course Should I Choose if I Want to Work with Cancer Patients?

If your passion lies in helping people through their cancer journey, consider the radiation therapy career path. Radiation therapists play a direct role in the treatment process and develop ongoing relationships with patients undergoing multiple sessions over several weeks.

If you are more interested in diagnostics and working across a wide range of conditions – not just cancer – then studying radiology may be the better fit. Both paths are valuable, but they differ significantly in clinical exposure and patient interaction.

Study Options and Duration in South Africa

To become a radiographer or radiation therapist in South Africa, you’ll need to enrol in an accredited programme from a recognised university.

Studying radiology in South Africa: A Bachelor of Radiography in Diagnostic Radiography typically takes four years. This course includes theory, clinical practice and training in various imaging modalities.

Radiation therapy career path: A Bachelor of Radiography in Radiation Therapy is also a four-year degree, with a curriculum focused on oncology, treatment planning and the therapeutic use of radiation.

Both degrees are offered at institutions such as the University of Johannesburg, Cape Peninsula University of Technology and the Durban University of Technology, among others. They are classified under healthcare courses in South Africa and are regulated by the Health Professions Council of South Africa (HPCSA).

Can You Switch from Radiology to Radiation Therapy?

While it is not common to switch between the two fields once qualified, it is possible to transition from radiography to radiation therapy with additional study and registration. This often involves:

• Completing a bridging course or postgraduate diploma

• Gaining additional clinical experience in the new field

• Meeting the regulatory requirements of the HPCSA

Switching from radiation therapy to radiology would similarly require retraining. Though the baseline knowledge of anatomy and medical technology overlaps, the roles are specialised enough to warrant formal requalification.

What Are the Risks Involved in Each Profession?

Both careers involve exposure to radiation, but strict safety protocols minimise risks to professionals.

• Radiographers are trained to avoid unnecessary exposure by using shielding devices, limiting scan time and ensuring proper equipment calibration.

• Radiation therapists work with higher radiation doses but do not receive direct exposure, as machines are operated remotely once the patient is positioned. However, therapists may experience emotional fatigue due to the ongoing nature of cancer care and the strong bonds formed with patients.

In both cases, occupational safety is a priority, and protective regulations are rigorously enforced.

Are Both Careers Regulated by the Health Professions Council of South Africa?

Yes. Both radiographers and radiation therapists must register with the Health Professions Council of South Africa (HPCSA) upon graduation in order to practise legally. The council ensures professional standards, ethical conduct and continuing education.

The HPCSA recognises both careers as essential components of South Africa’s healthcare system and provides distinct registration categories for each field.

Final Thoughts

Choosing between radiology and radiation therapy ultimately depends on your interests, personality and professional goals. Radiology offers a broad, diagnostic focus with applications across every area of medicine, while radiation therapy is a highly focused field where you can make a direct impact on the lives of cancer patients.

Both careers are respected, regulated and deeply meaningful. Whether you are drawn to the precision of imaging or the power of targeted treatment, medical imaging careers and cancer treatment careers each offer rewarding futures for those who wish to make a difference.

If you would like to speak to a professional about your or someone you love’s heart health, contact a Lenmed general practitioner or cardiologist today.