Thursday 3 July 2014

MCQ ON CT scan detectors



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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