MRI of the abdomen

Abdominal MRI is an MRI of the abdomen and is of great value to the neck and breast, MRI. Early in malignant tumors, the invasion of blood vessels and the staging of tumors are superior to CT. Take the advanced supine position, the median sagittal plane is consistent with the XO plane, such as the use of a respiratory compensation sensor, can be installed in the middle of the upper abdomen. Hepatobiliary spleen and pancreas examination, the center line is aligned with the midpoint of the rib arch. Kidney examination, the center line is aligned with the midpoint of the xiphoid and umbilical line. Basic Information Specialist Category: Digestive Examination Category: Nuclear Magnetic Resonance Applicable gender: whether men and women apply fasting: fasting Tips: Those who install artificial heart pacemakers and nerve stimulators are forbidden to check. Normal value Subcutaneous fat and bone marrow showed high signals on T1WI, T2WI and proton density images; cortical bone, air, ligament, tendon and fibrocartilage showed low signal; muscle and joint hyaline cartilage showed moderately low signal. Fluids, such as intra-articular fluid, inflammation or edema and tumor tissue, are low on T1WI and high on T2WI. The hematoma shows different signs of intensity depending on the length of the bleeding. Check for abnormal lumps and areas. Clinical significance Abnormal result Applicable scope of MRI examination of liver, gallbladder, pancreas and spleen (1) Primary or metastatic tumors of the liver, gallbladder, pancreas, and spleen, and hepatic cavernous hemangioma. (2) Hepatic parasitic diseases such as liver hydatid disease. (3) diffuse liver disease such as cirrhosis, fatty liver, hyperpigmentation. (4) Congenital dysplasia of liver, gallbladder, pancreas and spleen. (5) Liver abscess. (6) Liver localized nodular hyperplasia and hepatitis pseudotumor. (7) Follow-up and observation of surgery, radiotherapy, chemotherapy and other therapeutic effects. (8) Pancreatitis and its complications. People who need to be examined have abnormal pain and feeling in the abdomen. Precautions Forbidden before examination: fasting and water-free 4 hours before imaging examination, training patients to hold their breath. Requirements for inspection: Check the relaxed mood, follow the doctor's instructions to check, please bring the medical records, X-ray film, CT film, and previous MRI films along with the MRI room for reference. Inspection process Coil and body position: A body phased array coil or a body wrapped flexible coil is used. Take the advanced supine position, the median sagittal plane is consistent with the XO plane, such as the use of a respiratory compensation sensor, can be installed in the middle of the upper abdomen. Hepatobiliary spleen and pancreas examination, the center line is aligned with the midpoint of the rib arch. Kidney examination, the center line is aligned with the midpoint of the xiphoid and umbilical line. Conventional imaging orientation and sequence: Conventional cross-sectional and coronal imaging, combined with fat suppression technology, with sagittal imaging according to the situation. Conventional layer thickness 6 ~ 8mm, spacing 30%, pancreas or partial thin layer scanning: layer thickness 3 ~ 5mm, spacing 10%, phase encoding direction: cross section using LR direction, sagittal plane using AP direction or HF direction, coronal plane Adopt LR direction. Water imaging technique: Magnetic resonance cholangiopancreatography (MRCP) and magnetic resonance urography (MRU) are based on conventional imaging using 2D or 3D heavy T2WI-FSE sequence plus fat suppression technique, and post-processing MIP to obtain 3D projection images. Contrast enhancer: Contrast agent: 0.5 mol/L (Gd-DTPA), 0.1 mmol/Kg, intravenously injected at a rate of 3 ml/s. Dynamic Enhancement Technology: Immediately after the injection of the group, multiple repeated scans are performed under the same breath hold state, and the delay is determined according to the specific situation. Fast gradient echo T1WI sequences are often used. Not suitable for the crowd Inappropriate crowd: 1. Those who install artificial heart pacemakers and nerve stimulators are forbidden to check. 2. It is forbidden to check if there is a silver clip in the skull and a metal foreign object in the eyeball. 3. The ECG monitor cannot enter the MRI examination room. Those who have undergone arterial surgery, have had heart surgery and have an artificial heart valve are forbidden to check. 4, a variety of critically ill patients: such as coma after trauma or accident, irritability, arrhythmia, respiratory insufficiency, constant blood loss and incontinence and so on. 5. Metal objects (such as internal fixed steel nails) cannot be inspected at the inspection site. 6. Pregnant women should be examined carefully. If they are pregnant, please inform the doctor. Adverse reactions and risks Nothing.