6.True regarding filtration
a.responsible for low energy cut-off of the x ray spectrum
b.K-edge filter has k-edge in lower energy part
(ex.-erbium)
c.K-edge filter
remove only high –energy X –rays
d.K-edge filter is relatively transparent to the energies
just above the K-edge
e.K-edge filter is routinely used
Ans of previous blog
19.True regarding computed radiography
a.photostimulable phosphor have norrow
dynamic range
b.there is a linear relationship
between signal from a computed radiography plate and dose to the plate
c.the latitude of the CR system is
very much greater than for conventional radiography
d.choice of gradation curve are
dependent on the projection
e.histogram analysis involves an
analysis of the distribution of the light intensities outside the collimated area
19.bce----Photostimulable phosphor have a wide dynamic range,being able to record photon
intensities varying by a factor of about 10000:1.To display useful image ,the
processing of the data from the reader involves
to detect the collimated edges of the X-ray beam ,histogram analysis and
optimization of gradation curve . Histogram analysis involves an analysis of
the distribution of the light intensities within the collimated area. .(Chapter 5, page
no.84-85,second edition (2008),Farr’s Physics for Medical Imaging).
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