Beyin Omurilik Sıvısı Akım Görüntüleme Temelleri ve Klinik Uygulamaları
Özet
Manyetik rezonans görüntüleme (MRG) teknolojisindeki gelişmeler, beyin omurilik sıvısı (BOS) dinamiklerinin non-invaziv, anatomik ve fonksiyonel olarak değerlendirilmesini sağlamıştır. BOS akımı, durağan ve hareketli dokular arasında sinyal farkı oluşturan ve kardiyak siklusla senkronize olan faz-kontrast MRG tekniğiyle incelenir. Bu yöntemde, uygun hız kodlama (venc) değerinin seçilmesi ve kantitatif analiz için serebral akuaduktusa dik aksiyal-oblik plan görüntülerin kullanılması esastır. Klinik uygulamalarda BOS akım MRG; normal basınçlı hidrosefali (NBH) tanısında ve atrofi ayrımında, araknoid kistlerin subaraknoid mesafeyle ilişkisinin saptanmasında, endoskopik üçüncü ventrikülostomi (EÜV) gibi cerrahi prosedürlerin öncesi ve sonrasındaki takipleri ile Chiari tip I malformasyonu ve siringomiyeli olgularında akım paternlerinin ortaya konulmasında etkin bir şekilde tercih edilmektedir. Sonuç olarak bu teknik, BOS akışında bozulmaya yol açan çeşitli nörolojik hastalıkların non-invaziv tanısında, cerrahi tedavi kararının verilmesinde ve tedaviye yanıtın fonksiyonel ve kantitatif verilerle değerlendirilmesinde kritik bir rol oynamaktadır.
Magnetic resonance imaging (MRI) advancements enable the non-invasive, anatomical, and functional evaluation of cerebrospinal fluid (CSF) dynamics. CSF flow is examined using the phase-contrast MRI technique, which creates a signal difference between stationary and moving tissues and synchronizes with the cardiac cycle. In this method, selecting an appropriate velocity encoding (venc) value and utilizing axial-oblique plan images perpendicular to the cerebral aqueduct for quantitative analysis are essential. In clinical applications, CSF flow MRI is effectively preferred for diagnosing normal pressure hydrocephalus (NPH) and differentiating it from atrophy, determining the relationship of arachnoid cysts with the subarachnoid space, pre- and post-operative follow-ups of surgical procedures such as endoscopic third ventriculostomy (ETV), and demonstrating flow patterns in Chiari type I malformation and syringomyelia cases. Consequently, this technique plays a critical role in the non-invasive diagnosis of various neurological diseases causing CSF flow impairment, in making surgical treatment decisions, and in evaluating treatment response using functional and quantitative data.
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