Biology Reference
In-Depth Information
FIGURE 14.8
CT scanning with board and dowels to standardize scans.
TABLE 14.2 CT Specifications for Scanning Bones for GE Light-
speed
16 Slice CT Scanner
Parameters
Specs
Table size
1.5 m length
Mass
150 at 0.8 seconds
Field of view (FOV)
32 cm
Resolution
0.625 mm slices
Peak kilovoltage (kVp)
100 KV
Bone algorithm
512/512 mm
of one large individual except for ribs, metacarpals, and phalanges. Each box was lined with
low-density polyurethane foam with an outline drawn for each bone to standardize posi-
tioning. I made a slice down the center of a strip of foam in which to place the vertebral
spinous processes in sequence. All foam elements were glued into position in the boxes.
All bones were positioned so that they touched neither another bone nor the foam core board,
only the foam liner. We then standardized the positioning of the boxes in the CT scanner by
strapping a piece of plywood to the scanner table. The plywood had eight dowels that were
used as reference markers to maintain the same position of the boxes in each scan. See
Figures
14.7 and 14.8
.
All individuals were scanned at the University of Tennessee Medical Center Outpatient
Diagnostic Center. Scanning was conducted using a GE Lightspeed
16 slice computed
tomography scanner. The CT specifications used are shown in
Table 14.2
. The voxel
dimensions were chosen as 512
512 mm on the advice of the radiologist to ensure the
accuracy of the measurements in the reconstructed DICOM image, with slices being 0.625
mm apart.
