Q.All are true regarding Tc 99m sulphur colloid except
a.minimal activity in blood after 20 minutes after IV bolus
b.60 to 70% taken by liver
c.particle size approx. 0.3 to 0.5 microns in diameter
d. 3 to 8 millicuries injected for routine liver scan
e.indium 113m colloid used as alternative
ANS.---b
Tc 99m sulphur colloid is taken by the reticuloendothelial
system –80 to 90 % by the liver ,5 to 10 % by the spleen,and a minimal amount
by the bone marrow of normal individuals.
The indium 113m colloid is not an ideal radionuclide because
of its high energy ,393 ke V. The In 113 generator needs replacement twice
yearly as opposed to weekly with the Tc 99m generator.
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