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Radthera > Compre > Flashcards

Compre Flashcards

1
Q

Is not a particulate radiation

A

Gamma

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2
Q

The heaviest subatomic particle

A

Neutron

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3
Q

How many electrons are there in k-shell?

A

2 (2n^2)
k=1

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4
Q

What is no longer used in radiation therapy but has
energy to 10-15 kev?

A

Grenz Ray

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5
Q

5.Which of the following uses low energy beam for
treatment?

A

Superficial

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6
Q

Who specializes in treating cancer with chemotherapy

A

Medical Oncologist

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7
Q

Who specializes in diagnosis and treatment of cancers
of blood?

A

Hematologist Oncologist

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8
Q

What are referred to as type of malignancy
management intended to alleviate pain?

A

Palliative

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9
Q

9.When is the source of cobalt 60 machine is replaced?

A

5-10 years

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10
Q

10.Which of the following drug name which is coined
by the original manufacturer

A

Generic name

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11
Q

11.Which of the following kV units uses 500 kVp - 1mV
treatment – Supervoltage therapy unit

A

Supervoltage therapy unit

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12
Q

Which of the following kV units uses 150 kVp – 500
kVp –

A

orthovoltage

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13
Q

Which of the following uses radiation for treatment at
a short distance and uses active isotopes –

A

Brachytherapy

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14
Q

Which of the following is found in the head of xray

A

1,2, and 3

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15
Q

Which of the following device is shaped as doughnut

A

Betatron

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16
Q

16.A device that consists of two cylinders – Cyclotron
17.What gas ionization is used as calibration instrument
– Ionization Chamber
18.Which of the following is true about the dose rate –
increase with increased field size
19.What is normally measured during an optical
distance indicator – SSD

A

Cyclotron

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17
Q

What gas ionization is used as calibration instrument

A

Ionization Chamber

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18
Q

Which of the following is true about the dose rate

A

increase with increased field size

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19
Q

What is normally measured during an optical
distance indicator

A

SSD

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20
Q

.What is the term that refers to the distance from the
source to the isocenter

A

SAD

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21
Q

What is the term that refers to the distance of the
source to skin

A

SSD

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22
Q

Early somatic effect on an organ system that results
from high doses of radiation

A

deterministic

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23
Q

Considered as radiosensitive

A

stem cells

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24
Q

Radio resistant

A

muscle and nerve cell

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25
Q

The majority of the radiation therapy treatment using
SAD

A

100 cm

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26
Q

Inverse square law 110 cGy/min at 100 cm, what
would be the best output at 2cm

A

27.5

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27
Q

A tissue equivalent material

A

Bolus

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28
Q

Are used commonly in combination with radthera
except

A

Respiratory Therapy

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29
Q

The cobalt 60 has an energy of

A

1.25

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30
Q

The most commonly used immobilization device in
head and neck

A

thermoplastic mask

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31
Q

The following modality can be used in imaging
localization except

A

mammogram

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32
Q

This refers to the representation of the external body
outline

A

Contour

33
Q

Tumors in early stage

A

a and b

34
Q

Which modality is not included in the management of
cancer patient

A

NOTA

35
Q

In treating breast cancer, the arm is at

A

90 degrees

36
Q

How many electrons are there in cobalt 60

A

27
(atomic number)

37
Q

What mode of decay where a neutron is converted to
proton or electron

A

beta minus decay

38
Q

Which of the following purposes of radthera where the treatment is to relieve symptoms and pain

A

palliative

39
Q

Which radthera treatment is performed at a shirt
distance

A

Brachytherapy

40
Q

Which of the following factors govern organ and tissue response on radiation exposure

A

1,2,3 (growth rate, radiosensitivity, reproductive characteristics)

41
Q

41.Which of the following is defined as a relative susceptibility of cells, tissues, and organs to the damaging effects of ionizing radiation

A

radiosensitivity

42
Q

What is the principal advantage of isocentric treatment over SSD technique fir treatment for multiple
chords

A

C (the patient is not moved in the treatment fields)

43
Q

Disadvantages of parallel opposed field?

A

excessive
tissue dose to above and below the tumor

44
Q

A treatment which a source axis distance remains constant at all time is referred to as

A

isocentric technique

45
Q

What radioactive material is used in treatment of
carcinoma of uterus

A

Radium 226

46
Q

Increase in field size will increase the

A

dose in build
up region

47
Q

As the energy of beam increases, the maximum dose
is

A

deeper to the tissue

48
Q

Adequate vermification of isodose charts from the manufacturer using

A

water phantom

49
Q

Insertion of copper aluminum and tin filters into the xray beam causes

A

low energy xrays to be absorbed

50
Q

Which photon interaction with matter is most likely to occur in radiation therapy

A

Compton Scattering

51
Q

Which of the following is true regarding to the function of flattening filter

A

reduces the dose rate at the center of the unfiltered beam

52
Q

PDD (Percentage Depth Dose) is significantly affected by

A

1,2,3,4

53
Q

Which of the following increases PDD

A

1,2,3

54
Q

What principle is described as a division of a total
plan dose into numerous dose to be given in small doses

A

fractionation dose

55
Q

Which of the following is not an example of internal
radthera

A

teletherapy

56
Q

What is described as atoms of elements that have the same number of elements with same number of protons different number of neutrons

A

Isotopes

57
Q

What nuclear reactions occurs when the nuclei form together for a larger nucleus

A

fusion

58
Q

Which of the following types of treatment is normally accomplished using a source to skin distance of 50 cm or more

A

Supervoltage and Megavoltage

59
Q

The depth of the maximum ionization is most
dependent on

A

beam energy

60
Q

Split into smaller doses which helps cell recover during treatment

A

fraction

61
Q

Where dose DMAX occur in cobalt 60 machine

A

0.5 cm

62
Q

TPR
TMR
TAR

A

Tissue Phantom Ratio
Tissue Maximum Ratio
Tissue Air Ratio

63
Q

.Which of the following describes the individual treatment dose

A

fractionation

64
Q

Which of the following describes the total duration

A

protraction

65
Q

What will be the dose to the spinal cord

A

47 Gy

66
Q

Which technique is currently used where several
beam intersect

A

crossfire

67
Q

Dose of DMAX

A

TMR

68
Q

Phantom

A

TPR

69
Q

Free space

A

TAR

70
Q

Used for dose calculation when treating isocentric
field

A

TAR

71
Q

Employed as a neo ajovan

A

pre operative or post operative

72
Q

Tandem and obords are typically used for tumor less
than normally cm

A

5 cm

73
Q

What energy of radiation has a maximum dose above 4 cm

A

20 mV

74
Q

The principal advantage of TAR is the inability to remove

A

SSD

75
Q

In a single SSD technique the dose is relatively normalized at

A

DMAX

76
Q

This refers to the area that encompassed by the 50%
isodose

A

physical random field

77
Q

The following are true about the acceptability criteria
using, except

A

maximum dose to the tissue greater
than 110

78
Q

Which of the following properties of isodose curves is considered true

A

A (the dose is greatest at the central
axis and progresses

Radthera (1 decks)

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