CT contrast scan

CT angiography is a method of performing an angiography of an organ or structure before scanning. For example, injecting iodine to 8-10 ml or injecting air 4-6 ml into the cerebral cistern for cerebral angiography and scanning, which is called cerebral angiography CT scan, can clearly show the cerebral cistern and small tumors therein. Perform an angiography of the organ or structure and then scan again. Basic Information Specialist classification: growth and development check classification: CT Applicable gender: whether men and women apply fasting: not fasting Tips: Before the examination, abdominal, pelvic and enhanced scans should be performed. Fasting should be performed 6 hours before the scan, and the morning should be fasted. Normal value To quantify the tissue's absorption rate for X-rays, Hounsfield defines a new scale "CT value." The CT values ​​of different tissues vary, and each fluctuates within a certain range. The CT value of the bone is the highest, 1000HU, the CT value of soft tissue is 20~70HU, the CT value of water is 0 (±10) HU, the CT value of fat is -50~-100, and the CT value of air is -1000HU. Clinical significance CT is suitable for the detection of new organisms in various parts of the body, the location diagnosis of a small number of tumors, the extent of tumor distribution, infiltration and metastasis, and CT-guided biopsy; suitable for the detection of inflammation in most parts of the body and the determination of its size. Such as brain, sputum, sinus, mediastinum, liver (inflammation or abscess such as bacteria or protozoa) inflammation of the pancreas and bones; for the detection of major vascular lesions (vascular malformations, hemangioma, vascular occlusion, bleeding) And qualitative diagnosis; has important value for determining the quantitative and qualitative bleeding of important organ trauma, is also very valuable for the location of a variety of traumatic foreign bodies, and is very sensitive to the detection of calcification or stones in some areas. CT is also suitable for the detection of a degeneration or congenital anomaly, such as liver steatosis and congenital abnormalities of the central nervous system. Precautions Before the examination: abdominal, pelvic and enhanced scanning examination, fasting 6 hours before the scan, check the morning fasting. Remove metal objects from the part to be inspected. Such as hairpins, keys, coins and buttons containing metal substances to prevent the occurrence of counterfeit shadows. For patients who do not affect cooperation, such as infants and young children coma, sedatives must be given in advance. After the examination: the dose of iodine contrast agent used in CT examination is large, the injection speed is fast, and the incidence of adverse reactions is high, especially the incidence of patients with specific allergies is higher, and severe cases can be life-threatening. The medical staff must closely observe the patient's condition during and after the injection. Once an adverse reaction occurs, proper treatment and care are very important. Inspection process 1. Do a good job of preparing the patient: Prepare the patient according to the requirements of different parts. Iodine allergy tests must be performed on patients who need to be augmented. Explain to the patient: Eliminate fear and make the patient cooperate with the examination. 2, the choice of scanning conditions: including body position, layer thickness and layer spacing, scanning parameters and scanning methods. Not suitable for the crowd Unsuitable people: iodine allergies, severe liver and kidney dysfunction, severe thyroid patients, acute pancreatitis, acute thrombophlebitis, multiple myeloma and other heterogeneous proteinemia, severe cachexia. Use with caution in patients with high risk factors, such as poor renal function, diabetes, asthma, urticaria, eczema, other allergic diseases, heart disease, other drug allergies, children under 1 year old and elderly over 60 years old.