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We
have segmented CT torso+head and MRI head slices of two living human males.
The manually segmented 129 x-ray CT transverse slices were used to create
a computerized 3-dimensional volume array modeling all major internal structures
of the body. The original x-ray CT images were reconstructed in a 512x512
matrix with a resolution of 1 millimeter in the x,y plane. the z-axis resolution
is 1 centimeter from neck to mid-thigh and 0.5 centimeter from neck to
crown of the head. Each voxel of the volume contains an index number designating
it as belonging to a given organ or internal structure; 68 such index numbers
are assigned. The final torso+head phantom is interpolated to create a
128x128x243 byte volume with isotropic voxel dimensions of 4 mms.
Secondly,
a dedicated head phantom was created by similar processing in which 124
transverse MRI were outlined. The transverse T2 slices, recorded in a 256x256
matrix have isotropic voxel dimensions of 1.5 mm. This dedicated head phantom
contains 62 index numbers designating neurological and taxonomical structures
in the brain, as well as anatomical regions. The final volume is contained
within a 256x256x128 byte array.
Both
of these volume arrays represent high resolution models of the human anatomy
and can serve as a voxel-based anthropomorphic phantom suitable for many
computer-based modeling and simulation calculations. We have applied them
to Monte Carlo simulations from which realistic image projection data has
been generated.
Disclaimer:
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