Magnetic Detection & Imaging, TechMed Centre, University of Twente, Enschede, The Netherlands.
Department of Vascular Surgery, Medisch Spectrum Twente, Enschede, The Netherlands.
J Magn Reson Imaging. 2022 Nov;56(5):1302-1308. doi: 10.1002/jmri.28182. Epub 2022 Mar 24.
Cerebral venous pathways are subjected to geometrical and patency changes due to body position. The internal jugular veins (IJVs) are the main venous drainage pathway in supine position. Their patency and geometry should be evaluated under different body inclination angles over a three-dimensional (3D) volume in the healthy situation to better understand pathological cases.
To investigate whether positional changes in the body can affect the geometrical properties and patency of the venous system.
Prospective.
15 healthy volunteers, of which seven males and median age 22 years in a range of 19-59.
FIELD STRENGTH/SEQUENCE: A 0.25-T tiltable MRI system was used to scan volunteers in 90° (sitting position), 69°, 45°, 21°, and 0° (supine position) in the transverse plane with the top at vertebra C2. A gradient echo sequence was used.
Three observers assessed IJVs on patency and created automatic centerlines from which diameter and patency were analysed perpendicular to the vessel at every 4 mm starting at the level of C2.
A Student's t test was used to find statistical difference (p < 0.05) in average IJV diameters per inclination angle.
The amount of fully collapsed IJVs increased from 33% to 93% (left IJV) and 14% to 80% (right IJV) when increasing the inclination angle from 0° to 90°. In both IJVs, the mean diameter (±SD) of the open vessels was significantly higher at 0° than 90° with 6.3 ± 0.5 mm vs. 4.4 ± 0.1 mm (left IJV) and 6.6 ± 0.6 mm vs. 4.3 ± 0.4 mm (right IJV).
Tiltable low-field MRI can be used to assess IJV geometry and its associated venous pathways in 3D under multiple inclination angles. Next to a higher amount of collapsed vessels, the average diameter of noncollapsed vessels decreases with increasing inclination angles for both left and right IJVs.
2 TECHNICAL EFFICACY STAGE: 1.
由于体位的变化，脑静脉通路会发生几何形状和通畅性的改变。在仰卧位时，颈内静脉（IJVs）是主要的静脉引流途径。为了更好地了解病理性病例，应在健康情况下，于三维（3D）容积上评估不同身体倾斜角度下 IJVs 的通畅性和几何形状。
探讨体位变化是否会影响静脉系统的几何特性和通畅性。
前瞻性。
15 名健康志愿者，其中 7 名男性，年龄中位数为 22 岁，范围为 19-59 岁。
场强/序列：使用 0.25-T 可倾斜 MRI 系统以横断面在 90°（坐姿）、69°、45°、21°和 0°（仰卧位）下对志愿者进行扫描，头端位于 C2 椎体上方。采用梯度回波序列。
3 位观察者评估 IJVs 的通畅性，并从自动中心线创建直径和通畅性，以垂直于每个 4mm 处的血管，从 C2 水平开始进行分析。
使用学生 t 检验来发现每个倾斜角度的 IJVs 平均直径的统计学差异（p<0.05）。
当倾斜角度从 0°增加到 90°时，完全塌陷 IJVs 的数量从 33%增加到 93%（左侧 IJVs）和从 14%增加到 80%（右侧 IJVs）。在双侧 IJVs 中，开放血管的平均直径（±SD）在 0°时明显高于 90°，左侧 IJVs 为 6.3±0.5mm 比 4.4±0.1mm，右侧 IJVs 为 6.6±0.6mm 比 4.3±0.4mm。
可倾斜的低场 MRI 可用于在多个倾斜角度下评估 3D 中的 IJVs 几何形状及其相关的静脉通路。除了更多的塌陷血管外，左侧和右侧 IJVs 的非塌陷血管的平均直径随着倾斜角度的增加而减小。
2 技术功效阶段：1。
