Comput Methods Programs Biomed - Quantitative analysis of digital subtraction angiography using optical flow method on occlusive cerebrovascular disease.

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Resumo

CKGROUND AND PURPOSE: Traditional digital subtraction angiography (DSA) provides detailed spatial resolution in the treatment of cerebrovascular disease. However, the available temporal information is often underutilized. The purpose of this study is to use deformable image registration with DSA to quantify the hemodynamic improvement of intracranial vessels after carotid stenting.MATERIALS AND METHODS: Eighteen patients with carotid stenosis (greater than 70% degree by NASCET criteria) were treated using percutaneous transluminal angioplasty with stents. Carotid angiograms of the anterior-posterior and lateral views were acquired before and after the treatment. The arterial and venous phases of each single acquisition were classified according to the first arrival time of contrast in the distal middle cerebral artery and the superior sagittal sinus, respectively. The optical flow method was subsequently applied to determine the blood flow velocity in intracranial vessels. Blood flow velocity comparisons were performed to determine the therapeutic effects of blood flow restoration.RESULTS: The pixel-by-pixel blood flow velocity was estimated using the optical flow method. A color scale was used in the visualization and estimation of the blood flow velocity in the vascular bed. The improvements of blood flow velocity in both the arterial and the venous phases were significant (p<0.05). The changes with contrast agent motion were more easily observed in the arterial phase compared with the venous phases.CONCLUSION: Quantitative digital subtraction angiography provides reliable blood flow velocity measurements, which facilitates pretherapeutic evaluation and a reliable follow-up analysis method for the evaluation of occlusive vascular disorder treatment in the head and neck regions.

Resumo Limpo

ckground purpos tradit digit subtract angiographi dsa provid detail spatial resolut treatment cerebrovascular diseas howev avail tempor inform often underutil purpos studi use deform imag registr dsa quantifi hemodynam improv intracrani vessel carotid stentingmateri method eighteen patient carotid stenosi greater degre nascet criteria treat use percutan translumin angioplasti stent carotid angiogram anteriorposterior later view acquir treatment arteri venous phase singl acquisit classifi accord first arriv time contrast distal middl cerebr arteri superior sagitt sinus respect optic flow method subsequ appli determin blood flow veloc intracrani vessel blood flow veloc comparison perform determin therapeut effect blood flow restorationresult pixelbypixel blood flow veloc estim use optic flow method color scale use visual estim blood flow veloc vascular bed improv blood flow veloc arteri venous phase signific p chang contrast agent motion easili observ arteri phase compar venous phasesconclus quantit digit subtract angiographi provid reliabl blood flow veloc measur facilit pretherapeut evalu reliabl followup analysi method evalu occlus vascular disord treatment head neck region

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