FRCR MCQ--- Fetal dose from radiological examination

FRCR MCQ--- Fetal dose  from radiological examination 

342.Correctly matched approximate dose to fetus from radiological examination 

a.chest PA ---- < 0.01 mGy

b.abdomen or pelvis AP ---1 mGy

c.lumber spine (AP and lateral0---1.5 mGy

d.barium follow through ----2 mGy

e.barium enema ---8 mGy

343. Correctly matched approximate dose to fetus from radiological examination

a.CT chest --- 0.1 mGy

b.CT pelvis ---25 mGy

c.T_c-99_m bone scan--- 4 mGy

d. T_c-99_m thyroid scan --- 0.5 mGy

e. T_c-99_m lung perfusion scan --- 0.3 mGy

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FRCR MCQ---Deterministic effect (non-stochastic effect)

334.True regarding deterministic effect (non-stochastic effect) 

a.no effect above threshold dose

b.the rate at which the dose is delivered influences the threshold dose

c.most deterministic effect have  no repair mechanisms

d.greatest fetal abnormality in the third week to third month week of pregnancy

e.large  variation in threshold dose from individual to individual

334.ab ---Deterministic effect has threshold dose ,but there is small variation in threshold from individual to individual.Most deterministic effect have repair mechanisms ,except damage to eye.The greatest fetal abnormality is seen in the third week to eigth  week of pregnancy.( Chapter 2,page no.25-26,second edition (2008),Farr’s Physics for Medical Imaging).