MRI of hepatocarcinoma displays _'s symptom

MRI of hepatocarcinoma displays _'s symptom
In T1 weighting picture,it is primary hepatocarcinoma can last signals, signals high low and,etc. signal. Water content and lipid content that hepatocarcinoma organizes are organized high than the normal liver. Water has the relaxation Henan Province time of long T1 and long T2, lipid has the relaxation Henan Province time of short T1 and longer T2. The moisture increases and lengthens T1 relaxation Henan Province time of tumour, but lipid increases and shortens T1 relaxation Henan Province time of tumour. The two can have 3 kinds of results at least while restricting the change of time of Henan Province of hepatocarcinoma T1 relaxation: The moisture of tumour increases more, but lipid has not or only increased on a small quantity, cause these some hepatocarcinoma to have the relaxation Henan Province time of longer T1. Present the case that the low signal nearly accounts for 2/3 on T1 weighting picture; Tumour it is little for moisture to increase, but lipid increase obviously, cause the 1 T of hepatocarcinoma gallop across the intersection of Henan Province and time than shorter than the normal organizer obviously, present the high signal on a weighting picture of T, account for 1/3 of the cases; The moisture of tumour increases and increases and in a certain proportionate relationship with lipid, do not cause the range lengthened T1 relaxation Henan Province time that these some hepatocarcinoma organizes very much or is very close with the normal organization, such signals as the latter generally presents on T1 weighting picture, and the former's signal intensity relates to procedures chosen. If choose T1 T1 weighting procedure with bigger weight, the hepatocarcinoma presents the low signal T2 on the contrary, choose the intersection of T1 and the intersection of weight and little the intersection of T1 and the intersection of weighting and procedure, hepatocarcinoma the can present, wait for signal. Adopt and spin the return waves echo short TR, short TE (T1 weighting) The procedure, most hepatocarcinoma presents the uneven low signal, there is little probability that minority present high, low signal of showing etc. and high signal of mixing signal district, the whole focus. Among them the focus is shown high, low to mix signal brief malignant reliable the intersection of sign and tumour these of pathological change on the intersection of spot and flaky high the intersection of signal and district represent the intersection of necrosis and bleed or the intersection of tumour and some prominent lipoprotein of hepatocarcinoma at the pathology The quality is gathered. Cancer and tubercle of the high signal need to distinguish with regeneration tubercle of liver cirrhosis, a different one of the two is in T, regenerated tubercle presents the low signal but cancer and tubercle present the high signal on the weighting picture. Generally relatively clear, especially the border can be clearly illustrated very much at the place where the membrane of bag forms at the focal border. When edema is more obvious that tumour presents the soaking growth or tumour week, the smudgy border.
In spin, go back at the wavelength, many the intersection of return waves echo and picture and most hepatocarcinoma takes the form of the uneven high signal district, and lengthen the signal intensity and decay with the time of return waves echo, the signal makes as the irregularity, smudgy border and abnormality. The principle of producing this sign may be formed diversified histologic structure by way of different associations by many kinds of shape different liver cancer cells because of hepatocarcinoma. Can see the cancer cell to arrange to ask for the form or nest under the mirror; The blood sinus among some cancer nests is very abundant, the blood sinus among some cancer nests is very rare, cancer is organized into a real bulk. To take the intersection of location and sign (if liver split with the intersection of liver and door becoming narrow hard to get, transferring primary hepatocarcinoma, the lower vena cava is pressed shifting and limitation of the liver outline out of shape and rises) , liver door and shift by cooking stove being often been and not primary hepatocarcinoma patient peritoneum later with liver cirrhosis, can all well reveal on MRI.
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