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'Backprojection' in keywords Facet   Publication Year 1992  [X]
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1Author    Rainer Kimmich, Eberhard Rommel, Peter Nickel, Daniel PusiolRequires cookie*
 Title    NQR Imaging  
 Abstract    A rotating-frame NQR imaging (ßNQRI) procedure based on pure NQR is reported. The tech-nique is suitable for powdery or crystalline solid materials containing quadrupole nuclei. The spatial information is encoded by gradients of the radio frequency amplitude of the excitation pulse. A special deconvolution procedure has been developed for the analysis of the spatial information encoded in the pseudo-FID of the NQR signal in the case of powder geometry. The technique is applicable to rotationally symmetric as well as to asymmetric electric field gradient tensors. The RF gradients are suitably produced by surface coils. The prominent advantage of surface-coil NQR is that objects larger than the coil diameter can be investigated. The imaging procedure then provides depth resolution in a range of the order of the coil radius. The technique is particularly suitable for the detection of gradients of physical parameters influencing the NQR line shift and of spatial distributions of the chemical composition. Examples are stress or temperature gradients. Two-dimensional images have been produced by rotating the sample step by step. For each orientation a profile across the sample is evaluated as the projection on the direction of the radio-frequency gradient. A projection-reconstruction formalism then permits the rendering of two-dimensional NQR images. 
  Reference    Z. Naturforsch. 47a, 361—366 (1992); received June 8 1991 
  Published    1992 
  Keywords    NQR, Imaging, Rotating-frame zeugmatography, Surface coil, Backprojection, Decon-volution 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0361.pdf 
 Identifier    ZNA-1992-47a-0361 
 Volume    47