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Nuclear Associates 76-908 & 76-907
Operators Manual
A ramp-crossing angle of 90° yields an angle of 45° between the ramp and the imaging slice plane. Each
slice thickness section consists of four triangular blocks arranged to form (signal producing) hot ramps
filling the gaps of 1 mm or 2 mm (Figure 1-5).
The ramps of the 1 mm gaps (forming diagonal lines) are glued at the opposite side inner wall of the
3DRAS phantom. Two sets of ramp sections are included in the phantom in order to allow the slice
thickness measurements in all three dimensions.
In a single multi-slice scan, the user can obtain images for signal-to-noise ratio, resolution in two
directions, slice thickness, and slice-to-slice gap.
1.2.2 Uniformity and Linearity (UAL) Phantom (76-907)
The UAL phantom has outer dimensions of 13" x 13" x 4" (Figure 1-6) with a small bubble (Figure 1-7)
filled with a solution attached on the surface of the phantom. A rectangular shape was adopted for ease
of reproducible positioning. Two parts of the phantom, flood and grid, are incorporated into one.
1-4
Figure 1-5.
Slice Thickness Sections
Slice Thickness Measurement Gaps
Gaps are 1 mm or 2 mm Throughout
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