Monday 23 June 2014

MCQ ON DIGITAL RADIOGRAPHY

501.True regarding amorphous silicon thin-film transistor (TFT) arrays
a.TFT is essentially a large integrated circuit
b.the dimensions of array correspond to the size of the area to be imaged
c.a transistor is a device that minimize an electrical signal
d. in TFT, the amplified signal is stored as an electrical charge

e.The charge can be released by a high potential and is applied column by column

ANS OF PREVIOUS BLOG

493.True regarding CR reader.

a.plate is removed from cassette in reader and scanned by laser
b.optical fibre above the plate  is used for scanning
c.rotating mirror above the plate direct emitted light to photomultiplier tubes
d.single scanning is enough to extract information
e.exposure of plate to light done to erase the residual signal

493.ae-----In CR reader, plate is removed from cassette in reader and scanned by laser .Rotating mirror  is used for scanning.Optical fibres  above the plate, direct emitted light to photomultiplier tubes.Repeated scanning is done  to extract information. .(Chapter 5, page no.84,second edition (2008),Farr’s Physics for Medical Imaging).

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