Computer scanning principle

Computed Tomography (CT) uses a strong dose of X-rays to capture internal images of the human body from multiple angles. Advanced computer technology is then used to combine multiple sets of extremely thin cross-sectional images to form a clear three-dimensional image to show the body. The condition of internal organs. Depending on individual patient conditions, medical staff may need to take, inject, or inject a contrast agent through an enema before undergoing a computer scan to enhance the clarity of the examination site.

Application

Computer scans are widely used and are generally used in the head, neck, chest, abdomen and pelvis to provide detailed images of multiple tissues, such as blood vessels, bones and soft tissues. For example, it can be used to detect and check whether there are cancer lesions on the body or perform cancer staging, check whether there are structural lesions in coronary arteries or other blood vessels, cerebrovascular lesions related to stroke, diagnose infectious diseases such as tuberculosis, and guide needle extraction. Biopsy and other issues. Computer scanning can also help doctors formulate and plan surgical plans.Safety instructions

• Computer-scanned X-rays contain ionizing radiation, and the amount of radiation is higher than that of ordinary X-rays. However, according to data from the British National Health Service (NHS), computer scans lead to less than one in 2,000 chances of a patient developing cancer in the future, and the impact on the patient’s health is very limited.
• Women should inform medical staff before the examination if they are pregnant or breastfeeding. Although the radiation from computer scans may not harm the health of the fetus, if feasible, doctors may recommend that the patient undergo an examination through another imaging diagnostic method to prevent the fetus from being affected by radiation.
• During the examination, the patient may need to inject contrast agent intravenously. Some patients may be allergic to the developer, and about 1% may experience minor reactions, such as itchy skin, nausea, pain at the injection site, coldness, and abnormal heat sensation.
• As for the more serious symptoms of allergic reaction to developing agents, including bronchospasm and severe hypotension, which may be serious and may lead to death, these are rare cases.
• Patients with severe renal failure or undergoing renal dialysis may have nephrogenic systemic fibrosis due to contrast agent allergy. If the patient’s kidney function is poor, he or she may need to take saline infusion and take kidney-tonifying drugs after the examination, or even consider not undergoing a CT scan.

Check process

Preparation before inspection

• Patients need to inform medical staff of their medical history and past surgeries and treatments, whether they are taking any medications, whether they have any medications, food allergies or other physical conditions.
• If the patient is taking the diabetes drug Metformin or similar drugs, he or she must stop taking the drug on the day of the examination and within 48 hours after the injection of the contrast agent. However, other drugs can still be taken normally.
• Some examinations require the injection of contrast agent. You must fast 4 hours before the examination and only drink water.
• Some patients with asthma or who have been allergic to seafood or developing agents need to receive anti-allergy medicine before the examination and take it 12 hours and 2 hours before the examination.

Check process

• The patient lies on the examination table and is fed into the circular tunnel of the scanner.
• The patient should avoid any movement during the examination.
• During the examination, the examination bed will move slowly, and the doctor or radiologist will monitor the entire examination process through monitoring equipment.
• Depending on the examination requirements, the patient may need intravenous injection of contrast agent.

Instructions after inspection

• After completing the examination and the medical staff confirm that the patient does not have any discomfort or allergic reaction, the patient can leave
• The patient can drink plenty of water to remove the remaining developer from the body.
• Medical staff will contact the patient to follow up on the examination report.