Saturday, 22 February 2014

FRCR MCQ ----INTENSIFYING SCREEN




FRCR  MCQ ----INTENSIFYING SCREEN 

105.True regarding intensifying screen is/are

a. polyester plastic used as screen support
b.reflecting coat  made of titanium dioxide
c.phosphor crystals remain suspended in a plastic containing 
substance
d.protective layer largely composed of cellulose compound
e.reflecting layer is indispensible component of screen.

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Q AND A OF PREVIOUS BLOG==============



195.True regarding MTF is/are


a.describe the ability of imaging system to reproduce the information

b.an MTF of 0 (zero)  is a perfect system

c.MTF of focal spot  increases with magnification used

d. intensifying screen MTF decreases with magnification

e.magnification reduces the frequency of information to be resolved 

ANS-----abe--MTF of focal spot decreases  with magnification 

used,larger the focal spot more drastic the deterioration of MTF .

 Intensifying screen MTF increases with magnification as 

magnification reduces the frequency of information to be 

resolved . ---.[Chapter 15,Page 235-36,  4th edition ,1990  

reprinted 2010 , Christensen’s Physics of 189. Diagnostic 

radiology].




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