title: Magnetic resonance Spectroscopy with Linear Algebraic Modeling (SLAM) for higher speed and sensitivity.
abstract: Speed and signal-to-noise ratio (SNR) are critical for localized magnetic resonance spectroscopy (MRS) of low-concentration metabolites. Matching voxels to anatomical compartments a priori yields better SNR than the spectra created by summing signals from constituent chemical-shift-imaging (CSI) voxels post-acquisition. Here, a new method of localized Spectroscopy using Linear Algebraic Modeling (SLAM) is presented, that can realize this additional SNR gain. Unlike prior methods, SLAM generates spectra from C signal-generating anatomic compartments utilizing a CSI sequence wherein essentially only the C central k-space phase-encoding gradient steps with highest SNR are retained. After MRI-based compartment segmentation, the spectra are reconstructed by solving a sub-set of linear simultaneous equations from the standard CSI algorithm. SLAM is demonstrated with one-dimensional CSI surface coil phosphorus MRS in phantoms, the human leg and the heart on a 3T clinical scanner. Its SNR performance, accuracy, sensitivity to registration errors and inhomogeneity, are evaluated. Compared to one-dimensional CSI, SLAM yielded quantitatively the same results 4-times faster in 24 cardiac patients and healthy subjects. SLAM is further extended with fractional phase-encoding gradients that optimize SNR and/or minimize both inter- and intra-compartmental contamination. In proactive cardiac phosphorus MRS of six healthy subjects, both SLAM and fractional-SLAM (fSLAM) produced results indistinguishable from CSI while preserving SNR gains of 36-45% in the same scan-time. Both SLAM and fSLAM are simple to implement and reduce the minimum scan-time for CSI, which otherwise limits the translation of higher SNR achievable at higher field strengths to faster scanning.
authors.affiliation: Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, MD 21287, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Refaat E
authors.initials: RE
authors.lastname: Gabr
authors.forename: Michael
authors.initials: M
authors.lastname: Schär
authors.forename: Robert G
authors.initials: RG
authors.lastname: Weiss
authors.forename: Paul A
authors.initials: PA
authors.lastname: Bottomley
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000465:Algorithms; D003198:Computer Simulation; D006321:Heart / Q000033:anatomy & histology; D006331:Heart Diseases / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007866:Leg / Q000033:anatomy & histology; D016014:Linear Models; D008279:Magnetic Resonance Imaging / Q000379:methods / Q000706:statistics & numerical data; D009682:Magnetic Resonance Spectroscopy / Q000706:statistics & numerical data*; D015233:Models, Statistical; D009010:Monte Carlo Method; D009206:Myocardium / Q000737:chemistry / Q000378:metabolism; D019047:Phantoms, Imaging; D010725:Phosphocreatine / Q000378:metabolism; D059629:Signal-To-Noise Ratio; D013909:Thorax / Q000033:anatomy & histology
chemical_list: D010725:Phosphocreatine; D000255:Adenosine Triphosphate