loraspect
The new LOrA-SPECT modality has proven to overcome the typical SPECT quality
disadvantages. It uses a short focal length fan-beam collimator and a short
transverse field of view detector. In a set up with four detectors these
move along four linear orbits in mutually transverse directions, i.e. perpendicular
to the patient’s body. This linear orbit acquisition (LOrA) generates
linograms forming a complete set of data. These data are sufficient to reconstruct
exactly the activity map.
Benefits
The benefits of LOrA over classical SPECT are:
• improvement in sensitivity by a factor 3 – 5
• no truncation problems
• detector size 50% smaller
• not sensitive to detector uniformity issues
• easy positioning possibility
figure 1
The detectors are moved radially close to the animal and the parameters
of the rectangle orbit
are automatically computed. The detectors then move automatically to the
start position A, the acquisition is initiated and the detectors move to
the end position B (see the figure 2)
figure 2
