Development of Intelligent Model for Radioactive Brain Damage of Nasopharyngeal Carcinoma Based on Radio-metabolomics

Inclusion Criteria: 1. Age 20-65; right handedness; Karnofsky physical condition score (KPS) ≥ 80; 2. Histologically or cytologically confirmed non keratinizing squamous cell carcinoma of the nasopharynx with stage T3-4NxM0（AJCC 7th）; 3. Plan to receive intensity-modulated radiation therapy, the primary dose is more than or equal to 66Gy, fractional dose is less than 2.3Gy; 4. Concurrent chemotherapy with cisplatin during radiotherapy, the total dose of chemotherapy is more than or equal to 200mg / m\^2; 7. Primary school education or above, be able and willing to participate in the clinical trial, be able and willing to sign the agreement and consent, and be able and willing to record the symptoms and treatment details as often as necessary; 5. White blood cell count ≥ 3 × 10\^9 / L, neutrophil count ≥ 1.5 × 10\^9 / L, hemoglobin ≥ 90g / L and platelet count ≥ 100 × 10\^9 / L; ALT / AST ≤ 1.5 times of upper limit of normal (ULN), alkaline phosphatase (ALP) \< 2.5 × ULN, bilirubin \< ULN; ALB ≥ 28g / L; 6. Patients can receive magnetic resonance imaging (MRI). Exclusion Criteria: 1. Unable or unwilling to give written and informed consent for MRI imaging, patients with claustrophobia, aneurysm clip, implantable nerve stimulator, implantable cardiac pacemaker or defibrillator, cochlear implant, eye foreign body or implant (such as metal chips, retinal clip) or pancreatic islet pump, and other contraindications for MRI scanning; 2. He has a history of radiotherapy for the parts requiring radiotherapy in the past; 3. There were no organic lesions in the brain, such as white matter lesions and brain atrophy, cerebrovascular diseases, brain tumors and brain trauma; 4. Active, known or suspected autoimmune diseases, including but not limited to systemic lupus erythematosus, rheumatoid arthritis, Sjogren's syndrome, ulcerative colitis, Crohn's disease, myasthenia gravis, Hashimoto's thyroiditis, Graves' disease and asthma requiring bronchodilators. Subjects with type I diabetes, hypothyroidism requiring hormone replacement therapy only, and skin diseases (such as vitiligo, psoriasis, or alopecia) not requiring systemic therapy were included. 5. Uncontrolled heart diseases, such as: (1) New York Heart Association classification grade 2 or above heart failure (2) unstable angina pectoris (3) myocardial infarction within one year (4) supraventricular or ventricular arrhythmias with clinical significance and requiring treatment or intervention. 6. Pregnant or lactating women (for women with sexual life and fertility, pregnancy test should be considered); 7. Previous or concurrent malignant tumors, except for non melanoma skin cancer, cervical carcinoma in situ and papillary thyroid cancer, which have recovered well after adequate treatment; 8. Active infection requiring systemic treatment, positive for human immunodeficiency virus (HIV, HIV 1 / 2 antibody). 9. A history of psychotropic drug abuse, alcoholism or drug abuse; 10. Anti-vascular targeted drugs were used during induction chemotherapy before treatment; 11. Other factors that may affect the safety of the subjects or the compliance of the test according to the judgment of the researcher. For example, serious diseases (including mental illness), serious laboratory abnormalities, or other family or social factors that need to be treated together. Currently or in the past, there are no major physical diseases, such as acute infection or untreated infection (viral, bacterial or fungal infection), heart disease, severe hypertension, diabetes, chronic kidney disease, genetic diseases, etc.