Biomedical Engineering Reference
In-Depth Information
(A)
(B)
Figure 2.5: (A) Axial cross-section of a PET scanner with septa in-place for
two-dimensional data acquisition. (B) Axial cross-section of a PET scanner with
septa retracted for three-dimensional data acquisition.
Ring of Detectors
Sinogram
y
q
r
x
q
q
r = x
cos
+ y
sin
Radial distance (
r
)
(A)
(B)
Figure 2.6: Schematic diagram showing how projection data is acquired (A)
and stored in the sinogram (B) for two-dimensional PET imaging.