Excellent soft-tissue contrast

Excellent soft-tissue contrast

With its superior soft tissue contrast compared to CT, MRI offers exquisite visualization of tumor boundaries and proximity to nearby critical structures.


The ability to tune contrasts can provide even more valuable information about tumor characteristics and tumor extent to facilitate enhanced delineation, and also provides possibilities for dose boosting strategies.

Functional imaging

Functional imaging

In addition to anatomical imaging, MRI offers the ability to obtain functional information that is beneficial for tumor detection and delineation, and for response monitoring.


Diffusion-weighted imaging (DWI) for example depicts areas of high signal intensity in soft tissues that are indicative of the restricted water mobility (i.e., diffusion) of a tumor and can also be used to identify lymph nodes. Changes in the tissue’s or lesion’s apparent diffusion coefficient (ADC) can provide insights that help predict the tumor’s response to radiotherapy.

No ionizing radiation

No ionizing radiation
Unlike CT, MRI images are created without using ionizing radiation. This is particularly important when the patients are children, in which exposure to a radiation dose should be minimized to reduce long-term secondary effects. The option to acquire multiple MRI exams paves the road towards “plan-of-the-day” approaches or monitoring treatment response for adaptive strategies.

Density information for dose calculation 

Density information
Innovative strategies in MRI-only simulation have made it possible to derive CT-like electron density information from MR imaging data. This capability enables physicians to use MRI as the radiotherapy department’s primary imaging modality for specific applications to eliminate tedious and error-prone CT-MR registration and simplify workflows.