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Choosing between medical linear accelerators (linacs) and cobalt-60 machines for radiotherapy requires careful consideration of local resources and needs. Both technologies have distinct advantages and disadvantages impacting infrastructure, cost, and clinical application.

Keywords:
Cobalt-60 teletherapyexternal beam radiotherapymedical linear accelerator

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Health Technology Assessment

Background:

  • Medical linear accelerators (linacs) and cobalt-60 machines are established external beam radiotherapy technologies.
  • Both technologies are widely used in various healthcare settings, particularly in low- and middle-income countries.

Purpose of the Study:

  • To compare medical linear accelerators (linacs) and cobalt-60 machines for external beam radiotherapy.
  • To evaluate key factors including infrastructure, maintenance, dosimetry, shielding, staffing, costs, security, patient throughput, and clinical utility.

Main Methods:

  • Comparative analysis of medical linear accelerators (linacs) and cobalt-60 machines.
  • Evaluation based on technical specifications, operational demands, and clinical outcomes.

Main Results:

  • Linacs demand more infrastructure and maintenance; offer superior dosimetry for conformal treatments.
  • Cobalt-60 machines present greater security challenges due to radioactive sources; linacs require more training and have higher lifecycle costs.
  • Linacs facilitate complex treatments and electron beam therapy; patient throughput is impacted by maintenance for linacs and source decay for cobalt-60.

Conclusions:

  • The choice between linacs and cobalt-60 machines for radiotherapy in resource-limited settings is complex and context-dependent.
  • A combination of technologies, potentially including orthovoltage X-ray units, may be optimal.
  • Decisions must prioritize local needs, resources, and long-term service sustainability.