Kidney CT scan

A CT scan of the kidney is a method of examining the kidney by CT. Basic Information Specialist classification: Urological examination classification: CT Applicable gender: whether men and women apply fasting: fasting Tips: Please cooperate with the doctor to relax when checking. Normal value No abnormality. Clinical significance 1. Can identify the location, size, shape, and extent of the mass; can identify the cyst as a cystic, substantial, fatty or calcified lesion, and even make a qualitative diagnosis. 2. When intravenous urography is shown to be a loss of function kidney, CT can determine the location, nature or congenital dysplasia of the lesion. 3. It can detect small calcification, stones or negative stones that cannot be developed by ordinary X-ray examination. 4. The diagnosis of renal tuberculosis has great value, which can show renal damage, pathological calcification and perirenal abscess. 5. Can determine the location, extent and perirenal hematoma of the kidney injury, as well as postoperative complications. Applicable to: 1. Clinical and other imaging data found or suspected kidney mass. 2. Inflammatory lesions in the kidney area, renal tuberculosis, hydronephrosis. 3. Kidney damage. 4. Allergic to iodine, contraindications to patients with angiography. 5. Guide the interventional diagnosis and treatment measures such as needle biopsy and attraction in the kidney area. Precautions 1, qualitative diagnosis of renal masses often have certain difficulties, must be combined with clinical manifestations, urography, B-ultrasound and other comprehensive analysis, in order to improve the correctness of the diagnosis. 2, for some high-density cysts in the kidney, CT diagnosis has certain difficulties. Inspection process 1. Prepare for inspection. 2. Inspection methods and scanning parameters. (1) Flat sweep: 1 Scanning position: supine position, the body is placed in the middle of the bed, and the arms are raised on both arms. 2 scanning method: continuous scanning of cross section. 3 Positioning scan: Determine the scanning range, layer thickness, and layer spacing. 4 scanning range: the upper pole of the kidney to the lower pole of the kidney including all kidneys. 5 Scanning rack tilt angle: Scan the rack 0°. 6 scan field (FOV): body range. 7 scanning layer thickness: 5 ~ 10mm. 8 scanning interval: 5 ~ 10mm. 9 reconstruction algorithm: soft tissue or standard algorithm. 10 scan parameters: according to CT model settings. (2) Enhanced scanning: Generally, an enhanced scan is required. 1 contrast agent dosage: 50 ~ 80ml ionic or non-ionic iodine containing contrast agent. 2 injection method: intravenous injection of pressure syringe or pressurized rapid push bolus injection, the injection rate is 1.5 ~ 3ml / s. 3 Scanning start time: continuous scanning (kidney arterial phase) is started after the injection is completed, scanning is started 30 seconds to 2 minutes after the injection (kidney parenchyma phase), and scanning is started 2 to 5 minutes after the injection (kidney filling period). Dynamic scanning of 4 group injection method: The same layer dynamic scanning can reflect the enhancement characteristics of local lesions more than the dynamic scanning method of moving bed, especially suitable for the differentiation of benign and malignant small lesions. 5 Other scanners and scan parameters: same as plain scan. (3) Spiral scan: This method can improve the detection rate and qualitative accuracy of small lesions, clearly show the renal cortex and medullary boundary, help identify inborn variation and occupying, better show renal damage and improve renal vascular disease Display ability. The layer thickness is 3 to 5 mm, the layer spacing is 2 to 5 mm, and the pitch is 1.0. Enhanced scan: 40-slice spiral scan after the start of the bolus injection. During the scan, the patient breathes in a calm breath. 3. Photo film requirements (1) Shoot the positioning piece, sweep and enhance the image in sequence. (2) The image display adopts soft tissue window, window position L30～50HU, window width W200～400HU; window width can be appropriately increased to distinguish fat and air in diseased tissue. (3) Coronal and sagittal reconstruction and radiography if necessary. (4) Measure the CT value and size of the lesion level, and measure the change of CT value before and after the enhancement of the lesion level if necessary. Not suitable for the crowd 1. Serious heart, liver and kidney dysfunction. 2. Allergic to iodine contrast agents. Adverse reactions and risks Can cause delayed allergic reactions.