title: Inherently self-calibrating non-Cartesian parallel imaging.
abstract: The use of self-calibrating techniques in parallel magnetic resonance imaging eliminates the need for coil sensitivity calibration scans and avoids potential mismatches between calibration scans and subsequent accelerated acquisitions (e.g., as a result of patient motion). Most examples of self-calibrating Cartesian parallel imaging techniques have required the use of modified k-space trajectories that are densely sampled at the center and more sparsely sampled in the periphery. However, spiral and radial trajectories offer inherent self-calibrating characteristics because of their densely sampled center. At no additional cost in acquisition time and with no modification in scanning protocols, in vivo coil sensitivity maps may be extracted from the densely sampled central region of k-space. This work demonstrates the feasibility of self-calibrated spiral and radial parallel imaging using a previously described iterative non-Cartesian sensitivity encoding algorithm.
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA.
authors.forename: Ernest N
authors.initials: EN
authors.lastname: Yeh
authors.forename: Matthias
authors.initials: M
authors.lastname: Stuber
authors.forename: Charles A
authors.initials: CA
authors.lastname: McKenzie
authors.forename: Rene M
authors.initials: RM
authors.lastname: Botnar
authors.forename: Tim
authors.initials: T
authors.lastname: Leiner
authors.forename: Michael A
authors.initials: MA
authors.lastname: Ohliger
authors.forename: Aaron K
authors.initials: AK
authors.lastname: Grant
authors.forename: Jacob D
authors.initials: JD
authors.lastname: Willig-Onwuachi
authors.forename: Daniel K
authors.initials: DK
authors.lastname: Sodickson
mesh_terms: D000465:Algorithms; D016477:Artifacts; D001185:Artificial Intelligence; D002138:Calibration; D003331:Coronary Vessels / Q000033:anatomy & histology; D019544:Equipment Failure Analysis / Q000379:methods; D005240:Feasibility Studies; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods; D018810:Magnetic Resonance Angiography / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity