An image of an mri machine in a hospital.

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3 Dimensional Conformal Radiation Therapy (3DCRT)

3DCRT uses a multiple number of fields that are shaped by multi-leaf collimators (MLCs) to conform the dose to the target volume

Tumors are not regular; they come in different shapes and sizes. 3D conformal radiation is a radiation therapy technique that sculpts radiation beams to the shape of a tumor. This is ideal for tumors that have irregular shapes or that lie close to healthy tissues and organs.

Three-dimensional conformal radiation therapy, or 3D-CRT, uses computers and high-definition software with special imaging techniques to map the size, shape, and location of the tumor.

Computer Assisted (CT) scans, Magnetic Resonance Imaging (MR) scans, and/or Positron Emission Tomography (PET) scans are used, individually or in combination, to create detailed, three dimensional representations of the tumor and the surrounding organs.

This therapy uses a multileaf collimator (MLC) to precisely direct a radiation beam to the targeted area. The MLC is a device with a series of computer-controlled leaf-like plates. As the radiation beams are very precisely directed, adjacent normal tissues receive less radiation and are able to heal quickly. Hence, this treatment is superior to the conventional 2D treatment.

This technique has been largely incorporated into intensity modulated radiation therapy (IMRT).


  • Helps in reducing the dose received by surrounding tissues
  • Can be used in settings where there are no critical structures which needs strict dose adherence