In France, according to the National Cancer Institute, it appears that treatments in radiotherapy centers for cancer will increase from 198,000 in 2015 to 239,000 in 2030: this represents 40,000 additional treatments in 15 years.

A meta-analysis on radiotherapy indicated that 10 to 20% of patients had clinically significant levels of anxiety at the beginning of radiotherapy.

Indeed, several factors generate this tension, above all the new or unfamiliar environment, the imposing and noisy scanner, the restraints that are difficult to bear or the nudity required for the examination.

This anxiety has an impact on performance of the planning CT scan examination, an essential step for the future treatment.

The radiotherapy unit of the Centre Hospitalier Departemental de Vendee has put in place resources to reduce anxiety felt during treatment sessions (music therapy, conversational hypnosis, sophrology or aromatherapy). However, nothing has been put in place to reduce the anxiety of patients in the period preceding the planning CT scan.

Virtual reality software seems to be a good alternative that requires fewer human resources.

The research hypothesis is that patients who have benefited from the virtual reality software will have a lower level of anxiety before the planning CT scan than patients who have not benefited from virtual reality.

Inclusion Criteria:

1. Patient with an indication for first radiotherapy treatment for breast or pelvic cancer (prostate, rectum, endometrium, anal canal and cervix)
2. Patient ≥ 18 years old,
3. Patient who has the capacity to understand the protocol and has given written consent to participate in the research,
4. Patient with social security coverage.

Exclusion Criteria:

1. Metastatic patients
2. Patients with previous radiotherapy
3. Patients with a diagnosis of hearing impairment
4. Patients with major cognitive disorders (such as dementia)
5. Psychiatric pathology such as schizophrenia
6. Patients with epilepsy or hypersensitivity to flashing lights
7. Patient with a pacemaker, hearing aid or defibrillator
8. Claustrophobic patients
9. Patients sensitive to motion sickness
10. Patients who are visually impaired or blind
11. Patients with migraine
12. Patients with skin defects and open wounds in the area where the helmet is applied (face or scalp) or in the eyes
13. Patients under guardianship, curators or deprived of liberty
14. Non French speaking patient
15. Illiterate patient
16. Patient participating in another clinical investigation or interventional clinical research protocol involving a drug
17. Pregnant or breastfeeding patient

From the simulation CT scan to the first radiotherapy session (i.e 15 days)

No adverse events related to the intervention (virtual reality headset) were reported.