中樞神經(jīng)系統(tǒng)影像診斷cns(參考版)
2025-01-07 04:16本頁面
【正文】 中樞神經(jīng)系統(tǒng)影像診斷 協(xié)和醫(yī)院放射科 孔祥泉 一、 Examination methods 1. Xray plain film ? This method is very simple and cheap. ? Some lesions can be found by it. ? Usually we cannot reach to an exact diagnosis only by this examination 2. Tomography ? Exact diagnosis still cannot obtained ? The method can manifested some osseous destruction which cannot be shown by plain film. Enhancement: 3. CT ? To display tumors, hemorrhage, infarction, infection and abnormality. ? To show the abnormal isodensity which cannot found by the plain scan. ? To confirm the quality of the lesion. ? Differential diagnosis of tumor and edema . Plain scan: ? The characters of the lesion including size, appearance, number, position , anatomy relation ,and so on can be shown by it. 4. Magic resonance imaging Plain scan: Enhancement: ? To show the abnormal isodensity which cannot found by the plain scan. ? To confirm the quality of the lesion. ? Differential diagnosis of tumor and edema . MRA: ? To show the vascular lesions such as aneurysm and arterial venous malformation. ? To display tumors, hemorrhage, infarction, infection and abnormality. ? The characters of the lesion including size, appearance, number, position , anatomy relation ,and so on can be shown by it. 5. DSA ? To show the vascular lesions such as aneurysm, arterial venous malformation.,blood supply of neoplasm 6. Myelography ? To show whether there are tumors and obstruction in spinal canal. It is also helpful to ensure the position and degree of obstruction. 一 、 Normal manifestation （ 一 ） 、 Plain film ? The inner and outer plate are dense and the diploe is spongy. suture ? All of the sutures are shown as sawtooth shadow impressions ? Multiple round low density in plain film. impression of the middle meningeal artery ? The impresstion of the middle meningeal artery is presented as streaks shadow and go out from wide to narrow 5. Impression of diploic vein 7. The Sella : 6. Impression of pacchionian granulation 8. Internal auditory meatus: About 6mm wide ,symmetrical canal The frontal parietal irregular hypodensity near the midline. The diploic vein’s impress appears as like hypodensity in the parietal region . 7~16mm long, 7~14mm wide and 8~20mm deep. of falx cerebri : 9. Calcification of pineal body : of choroid plexus 12 Calcification of petroclinoid ligament : It is presented as nodular hyperdensity on the lateral skull radiograph. The frontal view
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