549.True regarding the requirements of
CT scanner detectors
a.small size in order to allow good
spatial resolution
b.to have high detection efficiency
c.to have fast response with negligible
afterglow
d.to have norrow dynamic range
e.to have a stable ,noise-free
response
ANS OF PREVIOUS BLOG
543.True regarding X-ray tubes of CT
scanner
a.anode-cathode axis parallel to the
axis of rotation of the scanner to minimize heel effect
b.typically have two focal spots ,the
smallest being about 0.6mm
c.heat capacities of 4MJ or more
d.incorporation of heat exchanger to
cool oil
e.typically scanners are operated at
120 kv
543.bcde--- In X-ray tubes of CT scanner, anode-cathode axis
remains parallel to the axis of rotation
of the scanner to minimize heel effect. (Chapter 6, page no.104-5,second
edition (2008),Farr’s Physics for Medical Imaging).
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