FRCR MCQ ------DIGITAL RADIOGRAPHY (LUMINESCENCE)

323.True regarding luminescence

a.absorbs energy from an external source

b.re-emits the absorbed energy in the form of visible light

c.in photoluminescence ,external source of energy is radiation

d.there is delayed light emission (delay time of order of 10^-6 s) in fluorescence

e.phosphor refers to a material that has luminescent properties

ANS OF PREVIOUS BLOG

59.True regarding mammography unit-------

a.unit designed to produce x ray in the 15-20 keV uses molybdenum anode

b. .unit designed to produce x ray in the 15-20 keV uses berrylium window

c. unit designed to produce x ray in the 15-20 keV uses molybdenum  filter

d. unit designed to produce x ray in the 21-25 keV uses molybdenum anode 

e. unit designed to produce x ray in the 21-25 keV uses  berrylium anode 

59.abc-----Unit designed to produce x ray in the 21-25 keV uses tungsten anode and uses special(Pallidium) filter anode  -------(chapter 9,page 234, Physics for diagnostic radiology ,2^nd edition by P P Dendy and B Heaton,)

FRCR MCQ --MAMMOGRAPHY

59.True regarding mammography unit-------

a.unit designed to produce x ray in the 15-20 keV uses molybdenum anode

b. .unit designed to produce x ray in the 15-20 keV uses berrylium window

c. unit designed to produce x ray in the 15-20 keV uses molybdenum  filter

d. unit designed to produce x ray in the 21-25 keV uses molybdenum anode 

e. unit designed to produce x ray in the 21-25 keV uses  berrylium anode  

ANS OF PREVIOUS BLOG

19.Myocardial perfusion scan uses 

a. ²⁰¹Tl (thallous chloride)--- K+ analogue indicating perfusion (ischaemic heart disease) (delayed uptake reflects viability)

b. ^99mTc isonitriles---Cationic complexes taken up by myocytes in proportion to blood flow

c. ^99mTc teboroxime---Lipophilic compound which accumulates by diffusion

d. ^99mTc phosphines----Uptake proportional to blood flow

e. ^99mTc red blood cells---Blood pool label

FRCR MCQ---MYOCARDIAL PERFUSION/REPORTER GENE IMAGING

19.Myocardial perfusion scan uses 

a. ²⁰¹Tl (thallous chloride)--- K+ analogue indicating perfusion (ischaemic heart disease) (delayed uptake reflects viability)

b. ^99mTc isonitriles---Cationic complexes taken up by myocytes in proportion to blood flow

c. ^99mTc teboroxime---Lipophilic compound which accumulates by diffusion

d. ^99mTc phosphines----Uptake proportional to blood flow

e. ^99mTc red blood cells---Blood pool label

 ANS-----

35.True regarding  reporter gene –substrate combination

a. the herpes simplex virus type 1 thymidine kinase (HSV1-TK) and  fluoro-deoxy-arabinofuranosyl-iodouracil or FIAU

b. genes encoding for a modified human transferrin receptor and supraparamagnetic iron compounds

c. β-galactosidase and gadolinium contrast agent (EgadMe)

d. the herpes simplex virus type 1 thymidine kinase (HSV1-TK) and  (EgadMe)

e.  the herpes simplex virus type 1 thymidine kinase (HSV1-TK)  and gadolinium contrast agent (EgadMe)

35.abc 

REPORTER GENE IMAGING

 In reporter gene imaging,the reporter gene is incorporated into the nuclear DNA of the target cells by transfection (e.g. viral vector.The activated reporter gene is transcribed into the corresponding messenger ribonucleic acid (mRNA).Messenger RNA (mRNA)  is translated to the reporter protein.A reporter substrate  is admninistered.The reporter substrate interacts with the reporter protein to produce an imaging signal (e.g. gamma ray, paramagnetic effect).