FRCR MCQ --- Computed radiography

                                                  MCQ Computed radiography

119.True regarding computed radiography 

a.the laser light and stimulated emission has same wavelength

b.a photostimulable phosphor have a very large dynamic range compared to film

c.the photostimulable phosphor can record exposure difference of about 10000:1

d.dynamic range of photostimulable phosphor  is non linear

e.wide latitude system decrease the need for repeat exposure

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

 Scintillation detectors

Q.True regarding scintillation detectors---

a.  cadmium tungstate doenot have afterglow problem

b.  with rotate-fixed geometry ,alignment between rotaing x ray       tube and fixed detectors is fixed

c.  highly efficient crystal reduces crosstalk

d.  detectors with high stopping power promote crosstalk

e.  crosstalk  reduces resolution

ANS---.ace--- With rotate-fixed geometry ,alignment between rotaing x ray tube and fixed detectors is constantly changing because the geometry dictates that the detectors must be aligned with the center of rotation and the x ray tube. Detectors with high stopping power reduce crosstalk. ---[Chapter 15,Page 299,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].