enhanced magnetic resonance scan

An enhanced magnetic resonance scan is a CT or MR scan after intravenous injection of a certain contrast agent. The contrast agent is injected into the vein and distributed to the normal or abnormal tissues of the human body. The blood supply and supply sources of various tissues are different, and thus the distribution amount, distribution time and removal speed of the contrast agent are different. Because the CT contrast agent contains high-density substance iodine, the tissue density of the distributed contrast agent increases. The MR contrast agent contains a paramagnetic substance, which shortens the T1 time of the tissue, enhances the signal, and the amount of tissue absorption is different, and the degree of signal enhancement is different. Basic Information Specialist classification: growth and development check classification: nuclear magnetic resonance Applicable gender: whether men and women apply fasting: not fasting Tips: equipped with cardiac pacemaker, artificial heart valve, artificial cornea, metal clip after vascular surgery, tracheal intubation, contraceptive ring, metal foreign body and artificial joints, etc., please declare to the doctor to confirm whether this check can be carried out . Otherwise, the position of the metal foreign matter may move due to the attraction of the magnet, causing a hazard. Normal value No abnormal areas were found in the scan. Clinical significance Abnormal results: First, there is no obvious abnormality in the plain scan, but it is necessary to make an enhanced scan if the clinician or other examination is highly suspected of having a lesion. Because CT shows lesions by density difference, lesions in the liver, kidney and other parenchymal organs cannot be displayed in the flat scan because their density is not different from the surrounding normal tissues. The blood supply or supply source of the lesion is more or less different from normal tissue. When the contrast agent is injected into the vein, the amount or phase of the blood entering the lesion and the normal tissue will be different, and the density caused by the contrast agent will increase. There is a difference, so that the lesions that cannot be displayed by the flat scan are displayed. Second, the lesions were found in the plain scan, but the imaging findings of the differential diagnosis, such as the edge of the lesion, the internal structure, the blood supply, and the relationship with the adjacent tissue, were unclear, and the type of the lesion or the specific disease could not be determined. Enhanced scanning can make the above pathological features appear on CT or MR images, providing an important basis for the differential diagnosis of lesions, and sometimes a key basis. Third, some organs (such as the liver) have more types of tumors and tumor-like lesions, and the benign and malignant, treatment methods vary greatly, but the plain scan often shows similar, identification is very difficult. However, the degree of enhancement of various lesions in typical cases and their changes in the arterial phase, portal vein phase and lag phase, the internal enhancement sequence of the lesions, the distribution and morphology of the enhancement zone have different manifestations, and most of them can be clearly confirmed by multi-phase enhanced scanning. diagnosis. However, a small part of the identification is still difficult. Fourth, some tumor lesions are unclear in the plain scan, and can not be distinguished from the surrounding edema, inflammatory lesions, surgery or radiotherapy injury, so it is impossible to determine the extent of tumor invasion and post-treatment effects. Enhanced scanning tumor tissue enhancement, inflammatory lesions, injury and tumor tissue enhancement performance is not the same, edema is not enhanced, so it can clearly show the extent, size and shape of the tumor. Tumors that have been clearly diagnosed can be directly used for enhanced scans after treatment and are not used for plain scans. 5. In addition to bones, fats, and gases, the density of the various tissues and blood vessels of the human body is small when CT is scanned. The density of most substantial tumors is also close to these tissues, so sometimes it is impossible to distinguish the vascular sections and lesions and vascularity. Lesions and other lesions. After injection of contrast agent, the density of vascular cavity and vascular lesions is significantly increased, and it is easy to distinguish from other normal tissues and lesions. The soft tissue resolution of MR is very high, and the blood vessels have a fluid-flow effect, which is easy to distinguish. The people who need to be examined: the population after the magnetic resonance scan. Precautions Forbidden before inspection: Metal objects that will be carried with you before entering the scanning room, such as: mobile phones, pagers, watches, hairpins, jewelry, knives, magnetic record cards, credit cards, metal ornaments, belts, movable dentures, prostheses, metal buttons , hearing aids, etc. remain in the waiting room. When you have abdominal liver, gallbladder, pancreas, and spleen, please fast before 6 hours. Requirements for inspection: Critical patients should be accompanied by a clinician; patients who are unable to cooperate with the patient should be examined after treatment in the clinical department. It takes about 25 minutes to complete a magnetic resonance examination. During the inspection, you will hear the hum of the machine. At this time, please rest as much as possible, and breathe smoothly. Do not move the body to avoid affecting the image quality. An enhanced scan may be required after the end of the sweep to further clarify the diagnostic cost. On the day of the test, please bring relevant medical information such as CT, X-ray, angiogram, radionuclide examination, endoscopy and B-ultrasound test list, etc., in order to diagnose the doctor for comprehensive analysis. Inspection process After the magnetic resonance scan, when the magnetic resonance enhanced scan is required, leave the examination room, and then continue to return to the examination room after the injection of the contrast agent. Not suitable for the crowd Inappropriate people: equipped with cardiac pacemaker, artificial heart valve, artificial cornea, metal clip after vascular surgery, tracheal intubation, contraceptive ring, metal foreign body and artificial joints, etc., please declare to the doctor to confirm whether this can be carried out an examination. Otherwise, the position of the metal foreign matter may move due to the attraction of the magnet, causing a hazard. Adverse reactions and risks Nothing.