MCQ in Medical Physics

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A.  increase low-energy photons
B.  correct for the pulsing of radiation
C.  increase fluence along the central axis of the beam
D.  increase depth dose
E.  make the beam flat across the full field

A.  12 x 12
B.  13 x 13
C.  15 x 15
D.  18 x 18
E.  20 x 20

A.  245 cGy
B.  255 cGy
C.  261 cGy
D.  268 cGy
E.  281 cGy

( %DD for 100 cm SSD, 5-cm depth   87%
%DD for 100 cm SSD, 10-cm depth             68%
TMR 5-cm depth     0.93
TMR 10-cm depth   0.79
TMR 15-cm depth   0.65
TMR 20-cm depth   0.53 )

A. 0.45
B. 0.51
C. 0.55
D. 0.57
E. 0.59

A.  0.28
B.  2.8
C.  28
D.  280
E.  2800

A. 0.6
B. 1
C. 3
D. 30
E. 300


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