Radiation Therapy Mock Exam 4 || 100% Verified Solutions.
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
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
