Optimisasi Pemeriksaan Magnetic Resonance Venography Brain dengan Menggunakan Phase Contrast

Studi Variasi Nilai Velocity Encoding terhadap Citra Anatomi Vena Cerebralis pada Klinis Cerebral Venous Thrombosis

Abstract

Background: Magnetic Resonance Venography (MRV) is an imaging that has a sensitivity of 91.9% to

display veins using the Phase Contrast (PC) technique in producing tissue contrast. The most important

parameter is the Velocity Encoding (VENC) which is adjusted to the flow velocity of the veins. An

abnormality that often occurs is CVT due to thrombosis so that intracranial pressure increases. The

VENC setting is adjusted to the velocity of the veins. High VENC results in impaired vascular imaging,

whereas low VENC results in aliasing and decreased signaling. This study aims to determine the

difference in anatomical information of the cerebralis vein and determine the optimal VENC value on

MRV Brain Phase Contrast examination of CVT patients.

Methods: This type of research is quantitative with an experimental approach. Data collection was

carried out at the Radiology Installation of Gatot Soebroto Hospital on March 13-26, 2024. The study

sample of 10 CVT patients who were examined MRV with VENC variations of 10 cm /s, 25 cm /s, and

40 cm /s in five large veins and five small veins. Data collection was carried out using questionnaires

filled out by two respondents. The data were analyzed using the Friedman test and Wilcoxon test.

Results: The results of statistical tests showed significant differences in all anatomy of the sagittal and

coronal pieces assessed such as superior sagittal sinus, transverse sinus, straight sinus, sigmoid sinus,

galen vein, jugular internal vein, jugular external vein, trolard vein, internal cerebral vein, and labbe vein

with a p value of 0.000 (p < 0.05). The best anatomical image information results using VENC 25 cm / s

indicated by a mean rank value of 2.60.

Conclusions: The VENC value of 25 cm / s can display large and small veins optimally because it is able

to compensate for the venous flow speed of 10 CVT patients which occurs mostly in the transverse sinus

and sigmoid sinuses.