In this competing continuation application, we plan to remain focused on the development of magnetic resonance imaging devices and methods for treatment of vascular diseases. Conventional interventional procedures, such as balloon angioplasty or intravascular stent placement, are primarily guided by x-ray fluoroscopy with contrast injections outlining the vascular lumen, but this method provides no information about the vessel wall or its pathology. Intravascular MRI (IVMRI) offers several significant advantages over other imaging techniques, in that it can provide ultra-high resolution with high contrast definition of normal and diseased vessels, which is important for the characterization of atherosclerosis. We have developed miniature, long, flexible catheter coils and loopless catheter antennae for high resolution IVMRI of the blood vessels. Using these probes, we successfully acquired in vivo ultra-high resolution images of the arterial wall. Our in vitro studies demonstrated that, using this method, it is possible to identify the three morphological layers of human arteries and characterize atherosclerotic plaques. In this study, we will test the hypothesis that MR-guided coronary artery balloon angioplasty can be carried out with high accuracy and at high speed. To be able to test this hypothesis, we plan to develop the best-performing intravascular MR probes and modify the hardware and software of existing MR scanners to enable control of the imaging parameters in the scanner room directly by interventionalists during a vascular intervention. Moreover, we will develop a real-time projection MR angiography technique that enables imaging of the blood vessels by contrast injection directly into the arteries. We will test the accuracy and the speed of the overall system on a dog model with an artificial stenosis. We believe that using these novel methods and devices will open up a new avenue for accurate, precise and radiation-free coronary interventions.
| El-Sharkawy, AbdEl Monem; Schar, Michael; Bottomley, Paul A et al. (2006) Monitoring and correcting spatio-temporal variations of the MR scanner's static magnetic field. MAGMA 19:223-36 |
| Qiu, Bensheng; Karmarkar, Parag; Brushett, Chris et al. (2005) Development of a 0.014-inch magnetic resonance imaging guidewire. Magn Reson Med 53:986-90 |
| Krieger, Axel; Susil, Robert C; Menard, Cynthia et al. (2005) Design of a novel MRI compatible manipulator for image guided prostate interventions. IEEE Trans Biomed Eng 52:306-13 |
| Atalar, Ergin; Menard, Cynthia (2005) MR-guided interventions for prostate cancer. Magn Reson Imaging Clin N Am 13:491-504 |
| Celik, Haydar; Eryaman, Yigitcan; Altintas, Ayhan et al. (2004) Evaluation of internal MRI coils using ultimate intrinsic SNR. Magn Reson Med 52:640-9 |
| Karmarkar, P V; Kraitchman, D L; Izbudak, I et al. (2004) MR-trackable intramyocardial injection catheter. Magn Reson Med 51:1163-72 |
| Serfaty, Jean-Michel; Yang, Xiaoming; Foo, Thomas K et al. (2003) MRI-guided coronary catheterization and PTCA: A feasibility study on a dog model. Magn Reson Med 49:258-63 |
| Susil, Robert C; Krieger, Axel; Derbyshire, J Andrew et al. (2003) System for MR image-guided prostate interventions: canine study. Radiology 228:886-94 |
| Susil, Robert C; Yeung, Christopher J; Atalar, Ergin (2003) Intravascular extended sensitivity (IVES) MRI antennas. Magn Reson Med 50:383-90 |
| Yung, Andrew C; Oner, Ali Y; Serfaty, Jean-Michel et al. (2003) Phased-array MRI of canine prostate using endorectal and endourethral coils. Magn Reson Med 49:710-5 |
Showing the most recent 10 out of 14 publications
