Acquisition, Reconstruction, and Presentation
for 3-D Computed Tomography (CT)
for High Efficiency CT (HECT)™,
evaluation a 256 x 256 x 64 voxel phantom was created. Some 100 cubes
of size 6 x 6 x 6 voxels of density X = 5 were placed at random
that slab of density Y = 0.80. In order to simulate the quantum
counting statistics of the transmission electron imaging system the
superimposed by noise. The rms-noise level in the 0-degree
projection is about 25% of the intensity of projected cubes. A total of
at three degree increment were used for the reconstruction. These
projection test data and
the SIRT reconstruction were kindly provided by the National Institute
of Biomedical Imaging and Bioengineering (NIBIB / NIH)
(generated by M.
Aronova). HECT reconstruction was performed by Cyber Technology, Inc.
renditions (C) Wolfram R. Jarisch, 2008
HECT versus SIRT CT for Transmission
Original noisy projection data: three
of 49 selected projections at -72, 0, and
+72 degree tilt
angles rendered with IMOD2.
of HECT reconstruction with SIRT. The residuals are shown for 15
iterations with SIRT (left) and a
iteration with HECT (right). The
selected view is at 0 degree tilt. Observe that the residuals with HECT
contain a much smaller trace of the cubes relative to the noise
when compared to SIRT, implying the effective extraction of the
information about the cube density and the surrounding matrix.
slice-views through the 3-D HECT reconstruction of the slab.
Kremer J.R., D.N. Mastronarde and J.R. McIntosh, Computer visualization of
three-dimensional image data using IMOD, J. Struct. Biol. 116 (1996)
¹ Patent Pending