11.True regarding
collimators in gamma camera
a. placed in front of
the crystal to restrict the direction of gamma rays entering the crystal
b. The usual form of
collimator is a block of lead with an array of holes orientated perpendicular
to the face of the crystal
c.The performance of the
collimator is determined by the number of holes, the diameter and length of
each hole and the septal thickness
d. the resolution of
collimators designed for high-energy isotopes is generally poorer than that of
those used for low-energy isotopes.
e. The pinhole
collimator is a hollow metal cone that fits over a circular detector face, and
has a single hole at its point.
ANS OF PREVIOUS BLOG
6.True regarding neutrino
a.released during beta decay
b.an extremely small mass
c.no charge
d.interacts extremely weekly with matter
e.no effect on patients
ANS --abcde-----
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