CT interventional radiology belongs to minimally invasive medicine, which can solve the problem of tricky or excessive trauma of traditional medical treatment by only fine needle puncture under CT guidance, with minimal trauma, safety and simplicity, less patient pain and short hospital stay. Tumor puncture biopsy When CT or color ultrasound detects organ tumor, doctors and patients are most concerned about the benignity and malignancy of the tumor, which also determines the next treatment plan, and seeing the patient is the premise of treatment. In our work, we often encounter foreign patients who bring CT films to our clinic, and the relatives of patients are often at a loss because different doctors give different diagnosis results. For the diagnosis of tumor, we can take a shortcut by obtaining lesion tissue through fine needle aspiration and performing pathological examination to get the diagnosis directly, and pathological diagnosis is also the final diagnosis of tumor. The pathological diagnosis is also the final diagnosis of tumor. Common tumors of lung, liver, pancreas and other parts can be diagnosed qualitatively by puncture biopsy. Radiofrequency treatment for tumor Tumor cells have poorer tolerance to heat than normal cells, so radiofrequency is introduced into human tumor tissues through therapeutic electrodes to produce bioheat, which leads to coagulation, degeneration and necrosis of tissue cells, and achieves therapeutic purpose by destroying the diseased tissues and losing their activity in a minimally invasive way without damaging the surrounding tissues. It can be applied to most benign and malignant solid tumors. Tumor Particle Implantation, known as “Radioactive Particle Implantation Therapy”, is a treatment method to implant a radioactive source (titanium particles with a diameter of 0.8mm and a length of 4.5mm) into a tumor through a fine needle, and let it continuously release radiation to destroy the tumor. The radiation energy is fully utilized with little damage to normal tissues, avoiding the complications of normal radiotherapy. It is suitable for many types of solid tumors, especially for those with isolated tumor lesions, tumors that are not sensitive to radiotherapy, tumors suspected to have residuals during surgical resection, advanced tumors that cannot be removed surgically, and tumors that recur locally or metastasize distantly after surgery. Aspiration and sclerosis of cysts Aspiration and sclerosis of cysts in the liver and kidney are clinically common. For a few cysts that are large and cause symptoms of compression of adjacent organs and require treatment, aspiration and sclerosis after fine needle aspiration of cysts under CT guidance can completely cure most of them, avoiding the traditional surgical treatment.