Almost all commercially available SPECT systems are based on the gamma camera detector that was described in detail in Chapters 13 and 14

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Almost all commercially available SPECT
systems are based on the gamma camera
detector that was described in detail in Chapters
13 and 14. A single gamma camera head,
mounted on a rotating gantry, is sufficient to
acquire the data needed for tomographic
images. The gamma camera acquires twodimensional
(2-D) projection images at equally
spaced angular intervals around the patient.
These images provide the 1-D projection data
needed for reconstructing cross-sectional
images using the techniques described in
Chapter 16. Typically, clinical SPECT images
are reconstructed on a matrix of 64 × 64 or 128
× 128 pixels. Cross-sectional images are produced
for all axial locations (slices) covered by
the field of view (FOV) of the gamma camera,
resulting in a stack of contiguous 2-D images
that form a 3-D image volume.
The number of angular projections (or
views) needed when using a standard parallelhole
collimator can be calculated using
Equation 16-15. Because the resolution of
a general-purpose parallel-hole collimator is
approximately 1 cm at a distance of 10 cm
from the collimator (see Fig. 14-16), the
number of views required generally is between
64 and 128, for a FOV ranging from 20 to
60 cm in diameter. Although data acquired
over an arc of 180 degrees are sufficient for
tomographic reconstruction in SPECT, there
are advantages in terms of resolution uniformity
and correction for ?-ray attenuation in
acquiring data over a full 360-degree arc. This
is discussed in Section B.1.
The sensitivity of a SPECT

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