RADIATION THERAPY MOCK EXAM 4
Increasing patient thickness will (increase/decrease) contrast and (increase/decrease)
density. - Correct Answers -Decrease; decrease
The cathode consists of:
A. Filament
B. Focusing cup
C. Target
D. A & B
E. B & C
F. A, B, & C - Correct Answers -D. A & B
Which of the following materials are used as screens in radiation therapy?
1. Lead
2. Copper
3. Brass
4. Intensifying
A. 1 & 2
B. 1, 2 & 3
C. 1, 2, & 4
D. 2, 3, & 4 - Correct Answers -C. 1, 2, & 4
What layer of the intensifying screen is responsible for the conversion of X-ray to light?
A. Phosphor layer
B. Silver halide crystals
C. Amorphous silicon
D. Ferrous sulfate - Correct Answers -A. Phosphor layer
Which is responsible for the latent image when using film?
A. Phosphor layer
B. Silver halide crystals
C. Amorphous silicon
D. Ferrous sulfate - Correct Answers -B. Silver halide crystals
,Flat panel detectors are composed of:
A. Phosphor layer
B. Silver halide crystals
C. Amorphous silicon
D. Ferrous sulfate - Correct Answers -C. Amorphous silicon
Cones used for superficial therapy:
A. Must be 15-20 cm from the patients skin
B. Must be 20 cm or greater from the patients skin
C. Lie directly on the patients skin
D. None of the above - Correct Answers -C. Lie directly on the patients skin
The thickness for a lead screen used in radiation therapy should be:
A. 0.5 - 1 mm
B. 0.1 - 0.5 mm
C. 0.01 - o.05 mm
D. 1 - 2 mm
E. </= 3 mm - Correct Answers -B. 0.1 - 0.5 mm
The thickness for a copper screen used in radiation therapy should be:
A. 0.5 - 1 mm
B. 0.1 - 0.5 mm
C. 0.01 - o.05 mm
D. 1 - 2 mm
E. </= 3 mm - Correct Answers -E. </= 3 mm
The treatment of choice for hemangiomas is:
A. Superficial therapy
B. Contact therapy
C. Orthovoltage therapy
D. Megavoltage therapy
E. Grenz Rays - Correct Answers -B. Contact therapy
The treatment of choice for inflammatory disorders, namely those involving Langerhan's
cells is:
A. Superficial therapy
B. Contact therapy
C. Orthovoltage therapy
D. Megavoltage therapy
E. Grenz Rays - Correct Answers -E. Grenz Rays
,The treatment of choice for skin cancer
A. Superficial therapy
B. Contact therapy
C. Orthovoltage therapy
D. Grenz Rays - Correct Answers -C. Orthovoltage therapy
*limits dose to normal tissues underneath
The window for a Grenz Ray tube is made of:
A. Glass
B. Molybdenum
C. Beryllium
D. Lucite - Correct Answers -C. Beryllium
The cones used for Betatron's are made of:
A. Glass
B. Lead
C. Copper
D. Lucite
E. Steel - Correct Answers -D. Lucite
Superficial therapy has an energy range of:
A. 10 - 15 kVp
B. 50 - 150 kVp
C. 150 - 500 kVp
D. 1 MeV - Correct Answers -B. 50 - 150 kVp
Orthovoltage therapy has an energy range of:
A. 10 - 15 kVp
B. 50 - 150 kVp
C. 150 - 500 kVp
D. 1 MeV - Correct Answers -C. 150 - 500 kVp
Grenz Ray tubes have an energy range of:
A. 10 - 15 kVp
B. 50 - 150 kVp
C. 150 - 500 kVp
D. 1 MeV - Correct Answers -A. 10 - 15 kVp
, SSD's used in superficial therapy are usually:
A. 15 - 20 cm
B. 50 cm
C. 60 - 80 cm
D. 80 - 100 cm - Correct Answers -A. 15 - 20 cm
Superficial therapy can treat lesions _____ cm below the skin.
A. 0.1
B. 0.5
C. 1.0
D. 2.0
E. 50 - Correct Answers -B. 0.5
All of the following are benefits of superficial and orthovoltage treatment EXCEPT:
A. Decrease downtime
B. Extremely reliable
C. Free of electromagnetical problems
D. Increased accuracy due to the lockdown method after the cone is in position -
Correct Answers -D. Increased accuracy due to the lockdown method after the cone is
in position
SSD's used in orthovoltage therapy are usually:
A. 15 - 20 cm
B. 50 cm
C. 60 - 80 cm
D. 80 - 100 cm - Correct Answers -B. 50 cm
All of the following are MV machines EXCEPT:
A. Betatron
B. Cyclotron
C. Orthovoltage
D. Van de Graff generator
E. Linear accelerator - Correct Answers -C. Orthovoltage
On which MV machine do the particles travel in a circular pattern?
A. Betatron
B. Cyclotron
C. Orthovoltage
D. Van de Graff generator
E. Linear accelerator - Correct Answers -A. Betatron
Increasing patient thickness will (increase/decrease) contrast and (increase/decrease)
density. - Correct Answers -Decrease; decrease
The cathode consists of:
A. Filament
B. Focusing cup
C. Target
D. A & B
E. B & C
F. A, B, & C - Correct Answers -D. A & B
Which of the following materials are used as screens in radiation therapy?
1. Lead
2. Copper
3. Brass
4. Intensifying
A. 1 & 2
B. 1, 2 & 3
C. 1, 2, & 4
D. 2, 3, & 4 - Correct Answers -C. 1, 2, & 4
What layer of the intensifying screen is responsible for the conversion of X-ray to light?
A. Phosphor layer
B. Silver halide crystals
C. Amorphous silicon
D. Ferrous sulfate - Correct Answers -A. Phosphor layer
Which is responsible for the latent image when using film?
A. Phosphor layer
B. Silver halide crystals
C. Amorphous silicon
D. Ferrous sulfate - Correct Answers -B. Silver halide crystals
,Flat panel detectors are composed of:
A. Phosphor layer
B. Silver halide crystals
C. Amorphous silicon
D. Ferrous sulfate - Correct Answers -C. Amorphous silicon
Cones used for superficial therapy:
A. Must be 15-20 cm from the patients skin
B. Must be 20 cm or greater from the patients skin
C. Lie directly on the patients skin
D. None of the above - Correct Answers -C. Lie directly on the patients skin
The thickness for a lead screen used in radiation therapy should be:
A. 0.5 - 1 mm
B. 0.1 - 0.5 mm
C. 0.01 - o.05 mm
D. 1 - 2 mm
E. </= 3 mm - Correct Answers -B. 0.1 - 0.5 mm
The thickness for a copper screen used in radiation therapy should be:
A. 0.5 - 1 mm
B. 0.1 - 0.5 mm
C. 0.01 - o.05 mm
D. 1 - 2 mm
E. </= 3 mm - Correct Answers -E. </= 3 mm
The treatment of choice for hemangiomas is:
A. Superficial therapy
B. Contact therapy
C. Orthovoltage therapy
D. Megavoltage therapy
E. Grenz Rays - Correct Answers -B. Contact therapy
The treatment of choice for inflammatory disorders, namely those involving Langerhan's
cells is:
A. Superficial therapy
B. Contact therapy
C. Orthovoltage therapy
D. Megavoltage therapy
E. Grenz Rays - Correct Answers -E. Grenz Rays
,The treatment of choice for skin cancer
A. Superficial therapy
B. Contact therapy
C. Orthovoltage therapy
D. Grenz Rays - Correct Answers -C. Orthovoltage therapy
*limits dose to normal tissues underneath
The window for a Grenz Ray tube is made of:
A. Glass
B. Molybdenum
C. Beryllium
D. Lucite - Correct Answers -C. Beryllium
The cones used for Betatron's are made of:
A. Glass
B. Lead
C. Copper
D. Lucite
E. Steel - Correct Answers -D. Lucite
Superficial therapy has an energy range of:
A. 10 - 15 kVp
B. 50 - 150 kVp
C. 150 - 500 kVp
D. 1 MeV - Correct Answers -B. 50 - 150 kVp
Orthovoltage therapy has an energy range of:
A. 10 - 15 kVp
B. 50 - 150 kVp
C. 150 - 500 kVp
D. 1 MeV - Correct Answers -C. 150 - 500 kVp
Grenz Ray tubes have an energy range of:
A. 10 - 15 kVp
B. 50 - 150 kVp
C. 150 - 500 kVp
D. 1 MeV - Correct Answers -A. 10 - 15 kVp
, SSD's used in superficial therapy are usually:
A. 15 - 20 cm
B. 50 cm
C. 60 - 80 cm
D. 80 - 100 cm - Correct Answers -A. 15 - 20 cm
Superficial therapy can treat lesions _____ cm below the skin.
A. 0.1
B. 0.5
C. 1.0
D. 2.0
E. 50 - Correct Answers -B. 0.5
All of the following are benefits of superficial and orthovoltage treatment EXCEPT:
A. Decrease downtime
B. Extremely reliable
C. Free of electromagnetical problems
D. Increased accuracy due to the lockdown method after the cone is in position -
Correct Answers -D. Increased accuracy due to the lockdown method after the cone is
in position
SSD's used in orthovoltage therapy are usually:
A. 15 - 20 cm
B. 50 cm
C. 60 - 80 cm
D. 80 - 100 cm - Correct Answers -B. 50 cm
All of the following are MV machines EXCEPT:
A. Betatron
B. Cyclotron
C. Orthovoltage
D. Van de Graff generator
E. Linear accelerator - Correct Answers -C. Orthovoltage
On which MV machine do the particles travel in a circular pattern?
A. Betatron
B. Cyclotron
C. Orthovoltage
D. Van de Graff generator
E. Linear accelerator - Correct Answers -A. Betatron
