FRCR MCQ ---CHARACTERISTIC CURVE

FRCR MCQ ---CHARACTERISTIC CURVE

146.True regarding characteristic curve .

a.average gradient and speed is expressed in numeric terms

b.latitude of a film varies proportionally  with film contrast

c.latitude refers to the range of kVp

d.latitude is defined to produce a density within accepted range for diagnostic radiology(0.25 to 2.0)

e.more room for error in exposure in case of low  latitude film

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MCQ --GRID

88.True regarding grid----

a.strips are slightly angled in cross-section of focused grid

b.parallel grid has well defined convergent line

c.the focusing range  is fairly narrow for  a low-ratio grid

d.parallel grid is frequently used in fluoroscopic spot film 

devices

e.grid cassette is usually used for portable radiography

88.ade----Strips are slightly angled in cross-section of

 focused grid whereas it is parallel in parallel 

grid.Parallel grid  are focused at infinity ,so they donot 

have of a convergent line.the convergent line is noted in

 linear focused  grid .the convergent point is noted in

 crossed grid.The focusing range  is fairly wide  and

 narrow for a high –ratio grid. 

----[Chapter 8,Page 100,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology]