Single-center, Prospective Study on the Identification and Delineation of Brain and Lung Tumors and At-Risk Organs, and Functional Testing of Surrounding Tissues Based on Dual-Energy CT

Inclusion Criteria: 1. Voluntarily participate in and sign the informed consent in person. 2. Over 18 years old, gender unlimited; 3. After imaging diagnosis of primary lung cancer or space-occupying lung lesions with oligometastases, MDT decided to treat SBRT 4. Clinical stage IA-IV (cT1-4N1-3M0-1); 5. No serious abnormality of blood system, heart, lung, liver, kidney function and immune deficiency; 6. Coagulation function: activated partial thromboplastin time (APTT) \< the upper limit of normal 10 seconds, prothrombin time (PT) \< the upper limit of normal 3 seconds, plasma fibrinogen 2-4g/L; 7. Hemoglobin ≥100g/L, WBC≥4×109/L, neutrophils ≥1.5×109/L, platelets ≥100×109/L 8. Bilirubin \< 1.5 times the upper limit of normal value; Glutamic oxalic aminotransferase (ALT) \& Glutamic pyruvic aminotransferase (AST) ≤1.5 times the upper limit of normal value; 9. Serum creatinine ≤1.5 times the upper limit of normal value; 10. The willingness of men or women of childbearing age to use contraception in the trial; 11. Physical condition score ECOG level 0 \~ 2; 12. Expected survival \>3 months;13, Can acquire MRI scanning Exclusion Criteria: 1. Patients could not tolerate or were unwilling to undergo CT examination; 2. The primary lesion has undergone surgery or radiotherapy or chemotherapy or targeted or immunotherapy; 3. Subjects who have received other drug trials within the last 1 month; 4. People with severe allergic history or idiosyncrasies; 5. Patients with a history of severe lung or heart disease; 6. Severe comorbidities, such as uncontrolled hypertension, heart failure, etc.; 7. Pregnant or lactating women; 8. Previous history of malignant tumor; 9. Refusal or inability to sign informed consent to participate in the trial; 10. Currently or planning to participate in other clinical trials; 11,Can not acquire MRI scanning