Identification of Perivascular Space Dynamics with CT And MRI – Analysis with Hounsfield Unit and Point Value Measurements

Abstract

Introduction: This research aims to delineate the dynamic characteristics of perivascular spaces (PVS) using computed tomography (CT) and magnetic resonance imaging (MRI) examinations and to offer insights for differential diagnosis. Hounsfield Unit (HU) and point value measurements can aid in distinguishing PVS from other diagnosis. Methods: CT and MRI scans of patients diagnosed with PVS were retrieved from the radiology database. HU measurements were conducted on CT scans, while point value measurements were performed on T2-weighted MRI scans. Measurements of cerebrospinal fluid (CSF) HU and point values were also compared. Results: Evaluation of CT and MRI images from 117 cases revealed variability in HU and point value measurements of PVS across different imaging sessions, whereas no significant variability was noted in CSF. This underscores the homogeneous nature of CSF contrasted with the heterogeneous nature of PVS. Conclusion: PVS display a heterogeneous structure and possess distinct internal dynamics, differing from CSF. Despite their dynamic nature, PVS maintain consistent sizes and generally do not exert mass effects despite their cystic appearance.