The overall purpose of this grant application is to further draw on the extensive developments made in contrast-enhanced MR angiography (CE-MRA) during the previous funding cycle and push the field to even higher levels. The last several years have seen multiple developments in CE-MRA, and we believe that the work of our own group has contributed materially to this. Specific developments include: (i) demonstration of a signal enhancement effect when 2D parallel acquisition is applied to elliptical centric CE-MRA;(ii) demonstration of improved vessel sharpness in accelerated CE-MRA;(iii) development of the Cartesian Acquisition with Projection-Reconstruction-like sampling (CAPR) pulse sequence for time-resolved CE-MRA;(iv) routine demonstration of acceleration factors exceeding 10 in CE-MRA;(v) development of modular coil arrays for accelerated CE-MRA;(v) demonstration that CAPR provides high fidelity in the portrayal of dynamic phenomena;and (vi) routine demonstration of high quality time-resolved 3D CE-MR angiograms of the brain and calves.
Specific aims to be studied are: 1. High Quality Comprehensive Neurovascular Exam. In an extension of the work performed during Years 20- 23 we will generate high quality images of the vasculature of the aortic arch, carotid arteries, intracranial arteries, and the draining veins of he brain in one comprehensive exam. The traditional test bolus used to assess timing in a 2D slice will be replaced with a low dose (1-2 ml) 3D time-resolved CE-MRA sequence. This will be followed by normal dose (18 ml) acquisition in which multi-element, modular RF coil arrays will allow 2D accelerated acquisition, providing high spatial resolution data sets for all territories. . High Resolution CAPR of the Upper Extremities and Abdomen. Parallel acquisition techniques previously developed for MR angiography of the brain and calves will be adapted to other anatomic regions. For each region the modular coil array elements will be matched to the specific field-of-view (FOV) and desired spatial resolution. For the hands the FOV is typically asymmetric (L/R vs. A/P), suggesting that elements having different sizes be used as for the calves. For the abdomen the increased FOV calls for larger coil elements. 3. Combined Angiographic and Perfusion MR Imaging. Analysis of the signal levels in brain parenchyma from CAPR CE-MRA studies of the brain has shown that first-pass parenchymal "blush" is detectable, suggesting the potential for providing perfusion information from the angiographic data set. However, this can be limited by a frame time which is still marginally too long and SNR which is marginally too small. To address this we will adapt the basic CAPR sequence for improved temporal resolution using 2D SENSE acceleration factors of ten-fold and higher. To retain SNR, particularly within the parenchymal signal, we will apply recently developed compressive sensing methods. 1
Cardiovascular disease is a major problem in the population of the United States. It is important to image and diagnosis this condition in an easy, accurate, reliable, and safe manner. It is also important to provide images with adequate spatial detail and which can portray progressive blood flow through the vessels. This project is relevant to this problem, as the goal is to develop a method which allows high spatial resolution MR imaging of the vasculature by developing ways to rapidly image the transit of intravenous contrast material within each patient.
|Johnson, Casey P; Weavers, Paul T; Borisch, Eric A et al. (2014) Three-station three-dimensional bolus-chase MR angiography with real-time fluoroscopic tracking. Radiology 272:241-51|
|Stinson, Eric G; Borisch, Eric A; Johnson, Casey P et al. (2014) Vascular masking for improved unfolding in 2D SENSE-accelerated 3D contrast-enhanced MR angiography. J Magn Reson Imaging 39:1161-70|
|Weavers, Paul T; Borisch, Eric A; Johnson, Casey P et al. (2013) Acceleration apportionment: A method of improved 2D SENSE acceleration applied to 3D contrast-enhanced MR angiography. Magn Reson Med :|
|Young, Phillip M; Mostardi, Petrice M; Glockner, James F et al. (2013) Prospective comparison of cartesian acquisition with projection-like reconstruction magnetic resonance angiography with computed tomography angiography for evaluation of below-the-knee runoff. J Vasc Interv Radiol 24:392-9|
|Trzasko, Joshua D; Haider, Clifton R; Borisch, Eric A et al. (2011) Sparse-CAPR: highly accelerated 4D CE-MRA with parallel imaging and nonconvex compressive sensing. Magn Reson Med 66:1019-32|
|Haider, Clifton R; Riederer, Stephen J; Borisch, Eric A et al. (2011) High temporal and spatial resolution 3D time-resolved contrast-enhanced magnetic resonance angiography of the hands and feet. J Magn Reson Imaging 34:2-12|
|Mostardi, Petrice M; Glockner, James F; Young, Phillip M et al. (2011) Contrast-enhanced MR angiography of the abdomen with highly accelerated acquisition techniques. Radiology 261:587-97|
|Mostardi, Petrice M; Haider, Clifton R; Glockner, James F et al. (2011) High spatial and temporal resolution imaging of the arterial vasculature of the lower extremity with contrast enhanced MR angiography. Clin Anat 24:478-88|
|Johnson, Casey P; Haider, Clifton R; Borisch, Eric A et al. (2010) Time-resolved bolus-chase MR angiography with real-time triggering of table motion. Magn Reson Med 64:629-37|
|Tan, Ek T; Huston 3rd, John; Campeau, Norbert G et al. (2010) Fast inversion recovery magnetic resonance angiography of the intracranial arteries. Magn Reson Med 63:1648-58|
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