Abstract
ObjectiveThis study compared data on the blood flow velocity in the internal carotid artery, which was obtained using the optical flow method (OFM) with digital subtraction angiography (DSA) and the time-of-flight (TOF) technique using magnetic resonance angiography (MRA).Materials and MethodsImages were obtained from 12 cerebrovascular patients who underwent both brain DSA and MRA imaging. The OFM was applied on the DSA images to determine the average blood flow velocity. The calculated results were compared with the values obtained from the TOF-MRA data. A linear fit was performed on the data and Bland-Altman plots were analyzed.ResultsThe blood flow velocity was closely associated with vascular diseases. Color-coding of the OFM measurements were superimposed on to the DSA images, which quantitatively illustrated the relative flow in the vessels. The average blood flow velocity was calculated using OFM and DSA, which demonstrated a high correlation with the MRA measurements in the anterior-posterior (AP) view (R = 0.71). In contrast, the average blood flow velocity was low in the lateral view (R = 0.28). The consistency between the high and low blood velocity in the AP view was better compared to the lateral view. The blood flow velocity distribution in the AP view was statistically closer to the MRA measurement compared to the lateral view.ConclusionsThis study evaluated the correlation of blood flow measured using DSA and TOF-MRA in a small heterogeneous group of patients with cerebrovascular lesions. OFM with DSA imaging reveals hemodynamic information and TOF-MRA.
Highlights
Hemodynamic information plays an important role in the visualization of anatomical structures and provides critical information for the diagnosis of head and neck vascular disease, treatment planning and evaluation [1,2]
The average blood flow velocity was calculated using optical flow method (OFM) and digital subtraction angiography (DSA), which demonstrated a high correlation with the magnetic resonance angiography (MRA) measurements in the anterior-posterior (AP) view (R = 0.71)
This study evaluated the correlation of blood flow measured using DSA and TOF-MRA in a small heterogeneous group of patients with cerebrovascular lesions
Summary
Hemodynamic information plays an important role in the visualization of anatomical structures and provides critical information for the diagnosis of head and neck vascular disease, treatment planning and evaluation [1,2]. There are several approaches to obtain the blood flow velocity in the head and neck blood vessels, including computed tomography (CT) perfusion, magnetic resonance (MR) perfusion, single-photon emission computed tomography (SPECT) and Doppler ultrasound. None of these techniques fully achieves the clinical requirements [3,4,5]. The syngo iFlow allows for a dynamic flow evaluation with visualization in a complete run in full color, which enhances the temporal resolution in the DSA. The quantification of blood flow using DSA is achievable with further image processing
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