What are two important features of a Linac compared to a 60 Co unit?

The two important features of a linear accelerator (Linac) compared to a cobalt-60 (60Co) unit are higher beam output and a sharper beam.

Higher beam output is significant because Linacs can deliver higher doses of radiation more quickly than cobalt-60 units, which is crucial for the treatment of cancer as it allows for more effective and efficient irradiation of tumors while minimizing exposure to surrounding healthy tissues. The ability to produce a higher output comes from the advanced technology used in Linacs, which allows for greater control over radiation parameters and delivery.

A sharper beam refers to the precision with which the radiation can be targeted at a tumor. Linacs are capable of producing highly collimated beams with various energy levels, allowing for enhanced treatment plans that can conform closely to the shape of the tumor. This precision helps to spare healthy tissue and critical structures from unnecessary radiation, improving treatment outcomes and reducing side effects.

This combination of higher output and sharpness in beam quality represents significant advancements in radiation therapy technology compared to the characteristics of a 60Co unit, which has limitations in both output and the precision of beam delivery.