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ABSTRACT
                   Phase II trial of bevacizumab for recurrent             Calculation of the impulse response function, h(t): two methods
                            grade III-IV glioblastoma
                                                                              Analytical solution              Numerical deconvolution
                                                                                (model based)                   (model independent)




                                                                                                              h(t) calculated directly from
                                                                           h(t) expressed as function
           Postcontrast static T1 weighted
                                                                                                             blood (Ca) & tissue (C t) curves
                                                                              of model parameters
              DCE-MRI image. Tumor
                                                                                                                via matrix computation
            region (ROI) outlined in red.
                                                                 1   2
                                                                 4   3
               Automation of numerical deconvolution analysis                             Numerical deconvolution results
                                                                         Noncompartmental analysis of h(t)




                                                                                           Sensitivity of noncompartmental analysis to truncation
                                                                                                     and lag-time correction of Ca and Ct




                                                                                                               All h(t)’s shown      h(t) >0 for all t
                                    A screenshot

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ISMRM 2009, Honolulu

  • 1. ABSTRACT Phase II trial of bevacizumab for recurrent Calculation of the impulse response function, h(t): two methods grade III-IV glioblastoma Analytical solution Numerical deconvolution (model based) (model independent) h(t) calculated directly from h(t) expressed as function Postcontrast static T1 weighted blood (Ca) & tissue (C t) curves of model parameters DCE-MRI image. Tumor via matrix computation region (ROI) outlined in red. 1 2 4 3 Automation of numerical deconvolution analysis Numerical deconvolution results Noncompartmental analysis of h(t) Sensitivity of noncompartmental analysis to truncation and lag-time correction of Ca and Ct All h(t)’s shown h(t) >0 for all t A screenshot