Range migration requires a coherent synthetic aperture processing in a summation manner in the time domain whereas the [omega]-k algorithm performs the backprojection
in the frequency-wavenumber domain.
Following corrections for scatter, dead time, and random coincidences, PET images were reconstructed by 3-dimensional filtered backprojection
and a Gaussian Filter (FWHM 3.5 mm), providing 64 contiguous transaxial slices of 5 mm thick spacing.
Projection-based methods pass the projection data through a decomposition function, followed by image reconstruction such as filtered backprojection
While previous methods generally employ iterative reconstruction or forward projection to combine PSF with reconstruction, the authors' method is an analytical method like FBP (filtered backprojection
(121,123,152) Although the weaker amplitude makes it difficult to infer the source locations using the backprojection
method, the global average of the energy partitioning is also informative.
voted for) are identified through a process known as backprojection
. From this, a rough segmentation (and consequently, bounding boxes) of the objects can be obtained.
Macovski, "Iterative convolution backprojection
algorithms for image reconstruction from limited data," Journal of the Optical Society of America, vol.
It is known that traditional computed tomography (CT) reconstruction algorithms, for example, filtered backprojection
methods, are not compatible to laterally truncated projection data, which appears often in the case of either (1) when the object extends outside of the field of view (FOV) or (2) X-ray beam collimation for the purpose of dose reduction.
A cross-entropy function of the KL-divergence between projection and backprojection
monotonically decreases along the solution to the continuous ML-EM system.
Scharfman, "The CA3 "backprojection
" to the dentate gyrus," Progress in Brain Research, vol.
Their topics include memory hierarchy for multicore and many-core processors, the Cilk and Cilk++ programming languages, efficient Aho-Corasick string matching on emerging multicore architectures, sorting on a graphics processing unit (GPU), evaluating multicore processors and accelerators for dense numerical computations, and backprojection
algorithms for multicore and GPU architectures.
The above formula can be implemented in two steps: the filtering step and the backprojection