Sunday 15 June 2014

MCQ ON MAMMOGRAPHY

473.True regarding mammography. 

a. aims to show microcacifications that may be 100micrometer or less
b. show tissues having much lower intrinsic contrast
c. atomic number of glandular tissues and adipose tissue (approx 7.4 and 6.5 respectively)
d. use of a broad bremsstrahlung spectrum  for imaging

e. target materials used for mammography  are tungsten ,molybdenum(z=42) and rhodium(z=45)




ANS OF PREVOIUS BLOG



465.True regarding causes of unsharpness in film –screen
a.thickness of phosphor
b.colored dyes
c.crossover
d.parallax
e.poor film-screen contact


465.acde--- Colored dyes  in the screen decrease  the unsharpness. (Chapter 4,page no.72-73,second edition (2008),Farr’s Physics for Medical Imaging).

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