MCQ ON DIGITAL RADIOGRAPHY

506.True regarding digital radiography 

a. Detective quantum efficiency (DOE) reflects the efficiency of phosphor detection and noise added to the detector signal

b.DQE may be 100% in DR system

c.DQE of CR system and film-screen system is close to 30%

d.Disadvantage of DR in comparison to CR are cost and versatility

e.a DR system  have the same flexibility in positioning as a CR plate

ANS OF PREVIOUS BLOG

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

501.abd------True regarding amorphous silicon thin-film transistor (TFT) arrays transistor is a device that amplifies  an electrical signal  and in TFT, the amplified signal is stored as an electrical charge.The charge can be released by a high potential and is applied row by row,so that timing of the detected signal determines the position of the pixel from which it originated. (Chapter 5, page no.86,second edition (2008),Farr’s Physics for Medical Imaging).