Frcr mcq --gamma camera (collimator)

11.True regarding collimators in gamma camera

a. placed in front of the crystal to restrict the direction of gamma rays entering the crystal

b. The usual form of collimator is a block of lead with an array of holes orientated perpendicular to the face of the crystal

c.The performance of the collimator is determined by the number of holes, the diameter and length of each hole and the septal thickness

d. the resolution of collimators designed for high-energy isotopes is generally poorer than that of those used for low-energy isotopes.

e. The pinhole collimator is a hollow metal cone that fits over a circular detector face, and has a single hole at its point.

ANS OF PREVIOUS BLOG

6.True regarding neutrino

a.released during beta decay

b.an extremely small mass

c.no charge

d.interacts extremely weekly with matter

e.no effect on patients

ANS --abcde-----

FRCR MCQ ---NEUTRINO

6.True regarding neutrino

a.released during beta decay

b.an extremely small mass

c.no charge

d.interacts extremely weekly with matter

e.no effect on patients

ANS OF PREVOUS BLOG

24.True regarding radionuclides 

a.Indium-111,2.8 day half-life,emit 173 keV and 247 keV gamma rays,labeling blood products

b.Iodine -123,13hr half –life, emit 160 keV gamma rays ,used for thyroid imaging

c.Iodine-131,8days half-life,emit 360 keV gamma rays and negative beta particle,used in metastases from carcinoma of thyroid

d.Gallium-67,72  hrs half-life,emit 92 keV,182keV and 300keV ,used in soft tissue malfnancy and infection

e.carbon ,20 minutes half –life, emit positron giving 511 keV gamma rays ,used for Co₂ for regional cerebral blood flow

ANS  abcde --all correct

FRCR MCQ ON RADIONUCLIDES

24.True regarding radionuclides 

a.Indium-111,2.8 day half-life,emit 173 keV and 247 keV gamma rays,labeling blood products

b.Iodine -123,13hr half –life, emit 160 keV gamma rays ,used for thyroid imaging

c.Iodine-131,8days half-life,emit 360 keV gamma rays and negative beta particle,used in metastases from carcinoma of thyroid

d.Gallium-67,72  hrs half-life,emit 92 keV,182keV and 300keV ,used in soft tissue malfnancy and infection

e.carbon ,20 minutes half –life, emit positron giving 511 keV gamma rays ,used for Co₂ for regional cerebral blood flow

ANS OF PREVIOUS BLOG

9.True regarding interaction------

a.the amount of energy required to create an ion pair is about 34 keV

b.x ray and gamma difficult to stop being uncharged and zero rest mass

c.the beta particle has mass and is charged ,so stopped easily (by perspex)

d.protons and alpha particles are more massive than negative beta particle  and are charged( stopped by paper)

e.neutrons are more penetrating than proton ,being uncharged

9.abcde----- ------(Physics for diagnostic radiology ,2^nd edition by P P Dendy and B Heaton,chapter 12,page 3 )