Biomedical Engineering Reference
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Fig. 6.11 Various beam-scanning designs to improve scan speed: ( a ) a TV-rate acousto-optic
x scan and a galvo y scan, and the partially descanned spot is imaged on to a photomultiplier
tube behind a confocal slit, ( b ) a TV-rate acousto-optic x scan and a galvo yscan, and the partially
descanned spot is imaged on to a linear CCD detector, ( c ) line illumination is combined with a slit,
and the confocal image written on to a CCD detector (or directly observed by eye) by a coupled
y0
scan, ( d ) line illumination is combined with a confocal slit, but the normal beam splitter is
replaced by a narrow strip mirror that reflects the illuminating light but allows the fluorescent light
from the sample to be detected
optic x scan and a galvo yscan, and the partially descanned spot, still scanning along
the x axis, is imaged on to a photomultiplier tube behind a confocal slit (as in the
Noran Odyssey). Thus, in fluorescence imaging, the detected fluorescent light does
not need to be descanned by the acousto-optic deflector. The arrangement shown
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