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optical projection tomography2004, sinogram - Coggle Diagram
optical projection tomography2004
OPT imaging
DATA Capture
suspend懸吊 specimen in the index-matching liguid
apparatus儀器 alighnment
to assume light pass through the specimen in approximately
straight line and can use standard backprojection algorithm
align the axis of rotation perpendicular to
optical axis
Drawback:
lenses use to focus an image
CT & OPT 成像差別
backprojection can be slightly modified
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reduce numerical aperature
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parallel-beam version
X-ray CT is not the case because the beam geometry is usually fan-shaped or cone-shaped
OPT
作者OPT系統
tomography using lenses: Transmission and Emission OPT
tomographic algorithm need to known the trajectories
detectors only measure the intensity, not the direction
all tomography technologies have strategy to detemine direction
PET
SPECT
using collimators
only photons traveling at the same angle
will pass through to the detector
drawback:
high proportion of the photon been screen out
OPT
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CT
sinogram