's symptom of liver cirrhosis MRI inspection method

's symptom of liver cirrhosis MRI inspection method
The device of magnetic resonance imaging applying to checking with belly at present has a greater than 1. 5T (special, Tesla, Tesla) High for magnetic field, 0.3-1.last magnetic field, the magnetic fields and magnetic fields ultralow to smaller than 0.04T lows of 0.1- 0.28T. The high magnetic field is relatively sensitive to factors such as breath moving, beating, blood flow and chemical displacement of the heart trunk,etc.. Picture quality is not very satisfied. Ultralow magnetic field because signal too weak, picture too bad. Difficult to diagnose. Think generally, and low machine of magnetic field relatively suitable for the inspection of the liver. MRI must set the human body free in stronger magnetic fields of people while checking. So must remove all metal foreign matters inside and outside the body by the persons who examine. If there is metal foreign matter that can't be removed. Various metal put such as the metal retainer plate after pacemaker, fracture is begged, after the operation are inserted. And internal warhead, shell fragment,etc.. Can't do this inspection. Patient with pacemaker. Should be far away from the magnetic field, so as to avoid the danger. In order to reduce the false shadow of the stomach content thing, must prohibit to eat for 4- 6 hours before checking. Sometimes in order to make the gastrointestinal tract form the contrast, oral mannitol aqueous 1000 ml of 30 minutes before checking for the patient. The patient fetches and lies supine the location, lie flat in portable checking the bed, the department position that will want to check is in the middle of magnet. The belly checks the multi-purpose body department coil, aim at the centre. Breathe the false shadow, employ the bellyband to tighten the belly for the belly reducing type. Check to the magnetic resonance imaging of the liver, it is swept, can do an alternative scanning of cross section, precededding the form or arrow according to the emergence situation of pathological change that the routine is flat first, even become scanning of oblique location of the angle, tie and reveal the day of pathological change and surrounding tissue internal organs well. Suspect, have liver to those pathological change sweep getting negative while being flat and magnetic resonance imaging sweep, determine the nature getting difficult while being flat highly while being clinical, can do the magnetic resonance imaging and strengthen the inspection. The progress of MRI mainly reflects the application in the fast pulse array and application of specific contrast medium in recent years. The fast pulse array can finish checking while holding one's breath in once, has lightened the false shadow, have improved picture quality. Meanwhile, combine the detection rate of the obvious improvement pathological change of use of contrast medium and dependability diagnosed. Fast heavy T2. The weighting array can get the clear systematic picture of bile duct ,Heterogeneous dynamic scanning of liver after the fast gradient return waves echo array can be strengthened. Mainly there are 3 kinds of liver systems most common MR contrast medium, including $ L pharmaceutical (such as Gd-DTPA) outside cells ,In being netted leather system ' Liver, spleen, bone marrow) The ones that absorb exceed obeying and oxidizing the iron particle (SPIO) magnetically Absorb the intersection of he and manganese two adjoin, tremble aldehyde 2 phosphoric acid (Mn-DPDP) with normal hepatocyte . The injection function principle is the same as CT, it is extracellular fluid contrast medium, does not organize the specificity, can distribute over organizing normally, can distribute over the target and organize too. Can carry on the scanning in artery one and portal vein one respectively after injecting contrast medium. SPIO particle, until leather system absorb in being netted, enter the intersection of people and Kuffer cause signal that normal liver organize drop at the the intersection of cell and inherent the intersection of T2 and the intersection of weighting and picture, thus make the pathological change signal relatively increase and improve the contrast ratio that pathological change and normal liver organize. Good liver cell cancer as to pathological change (FNH, adenoma, splitting up of some uptake SPIO,etc.) ,Can distinguish with other liver pathological changes. Mn-DPDP is absorbed by the normal liver tissue, causes the normal liver and organizes Tl weighting signal to increase. The diagnosis specificity of MnDP-DP is similar to SPIO, two kinds of contrast mediums need the formation of image of delay in order to make the normal liver organized fully absorbing after injecting. MRCP invade the intersection of appraisal and the intersection of bile duct and method of system of human nature as a, replace inner mirror of person who diagnose drive in the wrong direction cholangiography of pancreas (ERCP) already in many aspects . Technology this or 3-D view observe pathological change through being two-dimentional, can use for, appraise the intersection of bile duct and the intersection of system and dissect, the intersection of gall stone and disease, narrow and tumour. MRCP also can use bile duct reconstruct, appraise in front of the skill and the intersection of peritoneoscope and gallbladder excise, appraise, reveal the narrow close bile duct of piece in front of the skill, and ERCP not winner and ERCP dangerous taller patient.
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