Ideally, the pitch should not be larger than the targeted final resolution (1 cm), requiring an acquisition software allowing automated helical SPECT that is not yet available on a commercial camera.
For retinal imaging, six raster scans with orthogonal fast scan axis orientation (horizontal and vertical) each consisting of 700 × 700 axial scans requiring an acquisition time of ~5 seconds for each raster (~30 seconds total) were acquired.
For anterior eye and full eye length imaging, two raster scans with orthogonal fast scan axes (horizontal and vertical) consisting of 500 × 500 axial scans requiring an acquisition time of <3 seconds each were acquired, motion corrected and merged.
Previous methods required an acquisition time of approximately 20 min, and were not precise because of respiratory movements causing visceral fat to move in and out of the volume where pancreas was expected to be.
Moreover, CCD sensors require a data acquisition (DAQ) card to accomplish image capturing.
The KMAs both require a dynamic acquisition over the tissue of interest to obtain its time-activity-curve (TAC) and a serial blood sampling to estimate the so-called input function (IF, i.e., 18F-FDG blood TAC).
However, smaller voxels require a long acquisition time which is unbearable for some patients.
They require a fast acquisition (less than 2 min), repeated usually at 5 8 min, and postprocessing (subtraction, or functional display of the results on the whole image).
CZT MPI studies without an integrated diagnostic CT scanner require a separate acquisition for a transmission map either using a low-end CT scanner, not capable of obtaining a CAC score, or using a separate stand-alone CT scanner capable of obtaining a CAC score.
Bone scintigraphy of the peripheral skeleton mainly of the small bones and joints of the hands burdens a potential suboptimal spatial resolution and poor anatomical definition often requiring a longer acquisition time, zoomed acquisition, and even change of collimators.
