NDLI: 3d time-resolved mr angiography (mra) of the carotid arteries with time-resolved imaging with stochastic trajectories: comparison with 3d contrast-enhanced bolus-chase mra and 3d time-of-flight mra.

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3d time-resolved mr angiography (mra) of the carotid arteries with time-resolved imaging with stochastic trajectories: comparison with 3d contrast-enhanced bolus-chase mra and 3d time-of-flight mra.

Content Provider	CiteSeerX
Author	Lim, R. P. Shapiro, M. Wang, E. Y. Law, M. Babb, J. S. Rueff, L. E. Jacob, J. S. Kim, S. Mulholland, T. P. Laub, G. Hecht, E. M.
Abstract	BACKGROUND AND PURPOSE: Time-resolved MR angiography (MRA) offers the combined advantage of large anatomic coverage and hemodynamic flow information. We applied parallel imaging and time-resolved imaging with stochastic trajectories (TWIST), which uses a spiral trajectory to under-sample k-space, to perform time-resolved MRA of the extracranial internal carotid arteries and compare it to time-of-flight (TOF) and high-resolution contrast-enhanced (HR) MRA. MATERIALS AND METHODS: A retrospective review of 31 patients who underwent carotid MRA at 1.5T using TOF, time-resolved and HR MRA was performed. Images were evaluated for the presence and degree of ICA stenosis, reader confidence, and number of pure arterial frames attained with the TWIST technique. RESULTS: With a consensus interpretation of all sequences as the reference standard, accuracy for identifying stenosis was 90.3 % for TWIST MRA, compared with 96.0 % and 88.7 % for HR MRA and TOF MRA, respectively. HR MRA was significantly more accurate than the other techniques (P .05). TWIST MRA yielded datasets with high in-plane spatial resolution and distinct arterial and venous phases. It provided dynamic information not otherwise available. Mean diagnostic confidence was satisfactory or greater for TWIST in all patients.
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Subject Keyword	Stochastic Trajectory Time-resolved Mr Angiography Hr Mra Contrast-enhanced Bolus-chase Mra Carotid Artery Time-of-flight Mra Twist Mra Reference Standard Ica Stenosis Extracranial Internal Carotid Artery Reader Confidence Consensus Interpretation Spiral Trajectory Retrospective Review High In-plane Spatial Resolution Dynamic Information Hemodynamic Flow Information Large Anatomic Coverage Mean Diagnostic Confidence Venous Phase Carotid Mra Pure Arterial Frame Under-sample K-space Distinct Arterial Combined Advantage Twist Technique Tof Mra Time-resolved Mra Parallel Imaging Time-resolved Imaging
Content Type	Text

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