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3D CRT (3-dimensional conformal radiation therapy) and IMRT (intensity-modulated radiation therapy) are both methods used in radiation therapy.

3D CRT delivers radiation in three dimensions, targeting the tumor while minimizing exposure to surrounding healthy tissue. IMRT, on the other hand, uses computer-controlled beams to deliver precise doses of radiation to the tumor from multiple angles, adjusting the intensity of the beams to conform to the shape of the tumor.

In terms of effectiveness, IMRT is generally considered more precise and can deliver higher doses of radiation to the tumor while sparing nearby healthy tissue. This can result in better tumor control and fewer side effects compared to 3D CRT.

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