FRCR MCQ ---4TH GGENERATION CT SCAN

4^th generation CT scan

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

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

105.True regarding intensifying screen is/are

a. polyester plastic used as screen support

b.reflecting coat  made of titanium dioxide

c.phosphor crystals remain suspended in a plastic            containing substance

d.protective layer largely composed of cellulose compound

e.reflecting layer is indispensible component of screen.

105.acd—Some intensifying screen does not have reflecting layer ,so it reflecting layer is not indispensible component of screen.Reflecting coat  is made of white  substance (titanium dioxide) .

[Chapter 9,Page 119,  4^th edition ,1990  reprinted 2010 , Christensen’s Physics of Diagnostic radiology].