Exact(2)
It also opens up new possibilities for objective and active control of the performed dynamic experiments, when previewing tools based on 2D tomographic slices instead of raw projections are used.
Post-filtering with Butterworth cutoff = 0.55 (Xeleris) and 0.5 (Link) cycles/cm and order 10 was applied for all OSEM reconstructions, while for FBP pre-filtering with Butterworth cutoff of 0.55 cycles/cm and order 10 was applied to the raw projections.
Similar(57)
Raw projection counts purely summed from all detectors were compared.
The maximal pixel value in the raw projection data is five.
A solution for the underflow problems is to upscale the raw projection data before reconstruction.
This study proposes an objective, quantitative technique for measuring subject motion in HR-pQCT acquisitions from raw projection data, using image similarity measures applied to parallelized projections at 0° and 180°.
The physicians responsible for the studies interpreted the images on the basis of integration of the rotating raw projection data, tomographic perfusion images, gated SPECT information, quantitative perfusion SPECT results, and a computer-assisted interpretation made by EXINI Heart™ (EXINI Diagnostics AB, Lund, Sweden).
Technically, iDose applies an iterative maximum likelihood denoising algorithm, based on Poisson statistics, on the raw projection data.
The raw projection datasets were filtered with a Butterworth filter (cut off frequency 0.50 cycles/pixel and power 6.0 for rest images, cut off frequency 0.50 cycles/pixel and power 5.0 for stress images).
It has been shown that it is possible to simulate exposure reduction by adding spatially correlated noise to reconstructed images [ 5]; however, the same research group states that there is no doubt that the ideal method is to add noise to raw projection data.
The computational tools necessary for the post-processing of raw tomographic projections have generally not experienced the same efficiency increase as the experimental facilities, hindering optimal exploitation of this new potential.
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