Visualization and Tracking of a Conventional Guidewire with Low Flip Angle SSFP Imaging: An Initial Study
نویسندگان
چکیده
R. Dharmakumar, I. Koktzoglou, S. A. Tsaftaris, S. Zuehlsdorff, R. A. Tang, G. A. Wright, and D. Li Radiology, Northwestern University, Chicago, IL, United States, Radiology, NorthShore University HealthSystem, Evanston, IL, United States, Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, United States, Siemens Healthcare, Chicago, IL, United States, Medical Biophysics, University of Toronto, Toronto, ON, Canada
منابع مشابه
Positive contrast spiral imaging for visualization of commercial nitinol guidewires with reduced heating
BACKGROUND CMR-guidance has the potential to improve tissue visualization during cardiovascular catheterization procedures and to reduce ionizing radiation exposure, but a lack of commercially available CMR guidewires limits widespread adoption. Standard metallic guidewires are considered to be unsafe in CMR due to risks of RF-induced heating. Here, we propose the use of RF-efficient gradient e...
متن کاملFree-breathing renal MR angiography with steady-state free-precession (SSFP) and slab-selective spin inversion: initial results.
BACKGROUND The aim of our study was the investigation of a novel navigator-gated three-dimensional (3D) steady-state free-precession (SSFP) sequence for free-breathing renal magnetic resonance angiography (MRA) without contrast medium, and to examine the advantage of an additional inversion prepulse for improved contrast. METHODS Eight healthy volunteers (mean age 29 years) and eight patients...
متن کاملVariable Flip Angle Steady State Free Precession Imaging for Reduction of SAR
Introduction Steady state free precession (SSFP) imaging is used in widespread applications such as breath-hold MRI examinations of the abdomen and cardiac due to its very high signal-sampling efficiency and good tissue contrast. SSFP imaging at a high static field strength of 3 T and greater often suffers from specific absorption rate (SAR) problems because a high flip angle and short repetiti...
متن کاملDesign and use of variable flip angle schedules in transient balanced SSFP subtractive imaging.
In subtractive imaging modalities, the differential longitudinal magnetization decays with time, necessitating signal-efficient scanning methods. Balanced steady-state free precession pulse sequences offer greater signal strength than conventional spoiled gradient echo sequences, even during the transient approach to steady state. Although traditional balanced steady-state free precession requi...
متن کاملFLASH proton density imaging for improved surface coil intensity correction in quantitative and semi-quantitative SSFP perfusion cardiovascular magnetic resonance
BACKGROUND A low excitation flip angle (α < 10°) steady-state free precession (SSFP) proton-density (PD) reference scan is often used to estimate the B1-field inhomogeneity for surface coil intensity correction (SCIC) of the saturation-recovery (SR) prepared high flip angle (α = 40-50°) SSFP myocardial perfusion images. The different SSFP off-resonance response for these two flip angles might l...
متن کامل