FRCR MCQ----Scintillation detectors

                                                           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

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

205.True regarding 4^th generation CT scan

a.the detectors donot move

b.the detectors form a ring that completely surrounds the patients

c.the x ray tube rotates in a circle outside the detector ring

d.there is   clear advantage of 4^rd generation over  3^th generation scanner

e.some designs have more than 2000 detectors

205.abe--- ---- The x ray tube rotates in a circle inside the detector ring in the 4^th generation CT scan.There is no clear advantage of 4^rd and 3^th generation over each other.[Chapter 15,Page 295-96,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].