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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