In recent years, we have developed new intravascular MRI (IVMRI) probes in the form of guidewires and catheters for use in animal models. We have also developed IVMRI techniques that enable acquisition of high resolution cross-sectional images of the vessel wall, as well as tracking techniques for real-time visualization of the catheters. We believe that using these techniques, valuable information can be obtained for the diagnosis and treatment of atherosclerosis of other vessel diseases in humans. In this proposal, we will test the hypotheses that our IVMRI technique () is a low-risk method and (b) can be used for the visualization of interventional techniques, namely balloon angioplasty and stent placement procedures. Specifically, we will (1) refine and adapt our existing IVMRI probes in the form of catheters and guidewires that will be suitable for use in human patients, and (2) evaluate the safety of these devices in accord with FDA-established guidelines by calculating/measuring the additional heating caused by the presence of the intravascular MRI devices and assessing any potential for tissue damage. We will also (3) evaluate whether currently available perfusion MR imaging and non-invasive MR angiography (MR) techniques can be combined with IVMRI techniques to perform intravascular MR fluoroscopy (IVMRF)-guided interventional procedures, namely, balloon angioplasty and stent placement in animal models. In the final phase of the project, we plan to have enough data to apply for IRB approval for investigational use of these techniques in human patients.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL061672-04
Application #
6490632
Study Section
Diagnostic Imaging Study Section (DMG)
Program Officer
Buxton, Denis B
Project Start
1999-01-01
Project End
2003-12-31
Budget Start
2002-01-01
Budget End
2003-12-31
Support Year
4
Fiscal Year
2002
Total Cost
$256,976
Indirect Cost
Name
Johns Hopkins University
Department
Radiation-Diagnostic/Oncology
Type
Schools of Medicine
DUNS #
045911138
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Arepally, Aravind; Barnett, Brad P; Montgomery, Elizabeth et al. (2007) Catheter-directed gastric artery chemical embolization for modulation of systemic ghrelin levels in a porcine model: initial experience. Radiology 244:138-43
Sathyanarayana, Shashank; Aksit, Pelin; Arepally, Aravind et al. (2007) Tracking planar orientations of active MRI needles. J Magn Reson Imaging 26:386-91
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
Arepally, Aravind; Karmarkar, Parag V; Qian, Di et al. (2006) Evaluation of MR/fluoroscopy-guided portosystemic shunt creation in a swine model. J Vasc Interv Radiol 17:1165-73
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 (2005) Radiofrequency safety for interventional MRI procedures. Acad Radiol 12:1149-57
Atalar, Ergin; Menard, Cynthia (2005) MR-guided interventions for prostate cancer. Magn Reson Imaging Clin N Am 13:491-504
Hushek, Stephen G; Russell, Lori; Moser, Robert F et al. (2005) Safety protocols for interventional MRI. Acad Radiol 12:1143-8
Paliwal, Vaishali; El-Sharkawy, AbdEl-Monem; Du, Xiangying et al. (2004) SSFP-based MR thermometry. Magn Reson Med 52:704-8
Celik, Haydar; Eryaman, Yigitcan; Altintas, Ayhan et al. (2004) Evaluation of internal MRI coils using ultimate intrinsic SNR. Magn Reson Med 52:640-9

Showing the most recent 10 out of 25 publications