Deck 21: Simulator Design

Question 1

3)In the conventional simulator, the _____________ represent(s)the radiation field.

A) blades
B) wires
C) OID
D) collimator assembly

Answer 1

A
The blades, also called the beam-restricting diaphragms, delineate the radiation field.

Question 2

11)Most computed tomography (CT)scanners today are _______-generation imaging systems.

A) first
B) second
C) third
D) fourth

Answer 2

C
In the third-generation scanners, the x-ray tube and detector array continue to rotate around the patient.

Question 3

5)Conventional simulators are designed to simulate the ____________, geometric, and optical properties of a variety of treatment units.

A) x-ray
B) mechanical
C) comfort
D) linear design

Answer 3

B
A benefit of a conventional simulator is that it can simulate the same conditions of treatment units, which include mechanical, geometrical, and optical properties.

Question 4

15)The CT number for dense bone is _________.

A) -1000
B) -100
C) 0
D) 1000

Question 5

16)The CT number for water is _____________.

A) -1000
B) -100
C) 0
D) 1000

Question 6

10)Where are positioning lasers located?
I)Side (lateral)
II)Overhead
III)Sagittal
IV)Coronal

A) I and II
B) I, II, and III
C) II and III
D) All of the above

Question 7

4)Which of the following represents the path of a photon when it enters the image intensifier?

A) Input phosphor, electrostatic lenses, photocathode, anode, output screen
B) Input phosphor, photocathode, electrostatic lenses, anode, output screen
C) Input phosphor, anode, electrostatic lenses, photocathode, output screen
D) Anode, input phosphor, electrostatic lenses, photocathode, output screen

Question 8

17)The matrix size is determined by the number of ___________.

A) voxels
B) Hounsfield units
C) detectors on the scanner
D) pixels

Question 9

1)The central axis of the beam is ________________________.

A) always located in the center of the treatment field
B) the only area that is nondivergent
C) aligned with the isocenter
D) both a and c
E) both b and c
F)a, b, and c

Question 10

9)___________ takes into consideration how much a machine will run in a normal week.

A) Workload
B) Occupancy factor
C) Use factor
D) Barrier factor

Question 11

13)Which of the following details the difference in completing an axial scan as compared to spiral CT?

A) Aperture size is larger in an axial scanner.
B) Detector size is larger in the spiral CT scanner.
C) Gantry is rotating in a diagonal.
D) Table moves for the spiral CT.

Question 12

7)The patient couch tabletop is created out of this material, which has a low density and low x-ray absorption.

A) Plastic carbonate
B) Carbon fiber
C) Steel
D) Polystyrene

Question 13

6)Light photons are produced and transmitted electronically through to a video image at which of the following?

A) Output phosphor
B) Tube housing
C) Photocathode
D) Focusing lenses

Question 14

19)The Hounsfield unit for fat would be _________________.

A) +1000
B) -500
C) -100
D) 100

Question 15

8)__________ takes into consideration how an area on the other side of an irradiated wall is going to be used.

A) Workload
B) Occupancy factor
C) Use factor
D) Barrier factor

Question 16

18)As the field of view increases and the matrix size remains constant, the spatial resolution ____________.

A) increases
B) decreases
C) stays the same

Question 17

2)The conventional simulator can define treatment fields by using which of the following?

A) Blades
B) Wires
C) OID
D) Collimator assembly

Question 18

14)CT numbers are also known as which of the following?

A) Hounsfield units
B) Godfrey units
C) Attenuation coefficient units

Question 19

12)A(n)_________ ring allows the CT x-ray tube to rotate in a continuous motion without the concern of cables becoming tangled.

A) spiral
B) slip
C) aperture
D) electrical power