MR-LINAC is a radiotherapy machine that combines MRI imaging with a linear accelerator. It lets the team see certain organs and tumours more clearly while planning or giving treatment.
This is also called MRI-guided radiotherapy. It is useful in selected cases, especially when the target or nearby organs can shift from day to day.
Common Indications for MR-LINAC
Your doctor may consider MR-LINAC treatment for:
- Some prostate cancer cases.
- Selected rectal or pelvic tumours.
- Pancreatic or liver targets in selected centres.
- Tumours close to bowel, bladder, or other soft tissues.
- Cases where daily plan adaptation may help.
- Research or specialised treatment programmes.
What exactly does MR-LINAC treat?
It treats the planned tumour area with radiotherapy. The MRI part helps the team see anatomy more clearly during setup and, in some centres, adapt the plan for that day.
How is it different from normal radiotherapy?
Normal radiotherapy often uses X-ray based imaging for setup. MR-LINAC uses MRI images, which can show soft tissues better. This can help when the target is close to organs that move.
Is MR-LINAC better for everyone?
No. It is useful for selected cases. Some cancers are treated very well with standard LINAC radiotherapy, IMRT, VMAT, SBRT, or brachytherapy.
How should I prepare?
Preparation depends on the treatment area. You may need bladder or bowel instructions, fasting, MRI safety screening, or a special position. Tell the team about implants, metal fragments, or severe claustrophobia.
What happens when I arrive?
The team screens you for MRI safety, positions you on the couch, and takes MRI images. If the plan is adapted, you may wait while the team checks and approves the treatment.
How is the treatment performed?
You lie still inside the MR-LINAC while imaging and treatment are done. The machine may make MRI noises, and you may spend longer on the couch than with standard treatment.
How long does MR-LINAC treatment take?
It can take longer than standard radiotherapy, sometimes 30 to 60 minutes or more. Adaptive planning takes time because the team is checking the plan carefully.
Is there any discomfort?
The radiation does not hurt. The MRI part can feel noisy or enclosed, and lying still for longer may be uncomfortable.
Are there risks?
Radiotherapy side effects still depend on the treated area. MRI safety is also important, so metal objects and unsafe implants must be discussed before entering the treatment room.
Can I have MR-LINAC if I am pregnant?
Pregnancy Precaution
Tell your doctor if you are pregnant or think you might be. MR-LINAC includes radiotherapy, so pregnancy must be reviewed before treatment.
Conclusion
MR-LINAC is not magic, but it can be very helpful when seeing soft tissues clearly changes the treatment plan. Ask your team why it is being recommended for you and whether the session will take longer than usual.