Radiographic mottle

Radiographic mottle 

Q.True regarding radiographic mottle 

a.--structure mottle is due to defect in intensifying screen

b.---structure mottle is of no importance due to good quality control in manufacturing of screen

c.---quantum mottle is the only important cause of radiographic mottle

d.--quantum mottle  is due to statistical fluctuation in beam of x ray photons

e.---quantum mottle will be greater with low kVp

ANS ---.abcd----Quantum mottle will be greater with high  kVp

  x rays because they produce a higher screen intensification factor.

 [Chapter 14,Page 202-3,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].