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Computer Applications > Tx Planning Quizzes > Flashcards

Tx Planning Quizzes Flashcards

1
Q

visibile mass to included lymphadenopathy and metastasis

A

GTV

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2
Q

subclinical malignant diseases

A

CTV

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3
Q

To include all geometric variations (ITV+SM)

A

PTV

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4
Q

volume to include motion (CTV+IM)

A

ITV

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5
Q

normal tissue at risk of radiation damage

A

OAR

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6
Q

tissue that recieves a dose thatis considered significant in relation to normal tissue tolerance

A

IrV

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7
Q

T/F: isodose levels are modified by changing the energy, field size, beam arrangements, and beam modifiers to produce a desired dose distribution.

A

True

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8
Q

As source size increases the penumbra ________

A

increases

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9
Q

as SSD increases the penumbra _________

A

increases

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10
Q

as depth increases the penumbra _________

A

decreases

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11
Q

T/F: some MLC’s create a lot of penumbra when the leaves are mounted on diverging carriages

A

false

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12
Q

what is the most often used type of DVH graph?

a. cumulative
d. differential
c. superlative

A

a. cumulative

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13
Q

which DVH graphs the volume of a strucuture receiving dose within a specified dose interval?

a. cumulative
d. differential
c. superlative

A

d. differential

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14
Q

normaliziation point is the point chosen by the planner where the ____% isodose line is placed

A

100

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15
Q

which energy would give the most skin sparring?

a. 6 MeV
b. 20MeV
c. 6MV
d. 18MV

A

d. 18MV

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16
Q

does dose falloff more rapidly with photons or electrons?

A

electrons

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17
Q

does using more beams result in better homogeneity or worse homogeneity?

A

better

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18
Q

cerrobend blocks have more field conformality than MLC’s due to the

a. MLC leaf size
b. weight
c. field size
d. material

A

a. MLC leaf size

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19
Q

single field treatment techniques are usually used for this type of treatment

a. Tspine
b. prostate
c. brain
d. mantle

A

a. Tspine

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20
Q

a disadvantage of a parallel opposed treatment planning technique is

a. entry and exit dose
b. cold spots
c. weighting
d. complexity

A

a. entry and exit dose

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21
Q

an advantage of using a four field technique is:

a. max dose doubles
b. max dose increases
c. max dose decreases
d. max dose stays the same

A

c. max dose decreases

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22
Q

what does VMAT stand for?

A

volumetric modulated arc therapy

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23
Q

a commonl used treatment site that uses a matching field technique is:

a. larynx
b. craniospinal
c. brain
d. prostate

A

b. craniospinal

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24
Q

eliminates radiation dose to certain parts of an area where the beam is directed

A

shielding

25
Q

allows normal dose distribution to be applied to the treated area whereas to even out the dose distribution

A

compensation

26
Q

allows for a tilt in the radiation isodose curves

A

wedge filtration

27
Q

where the distribution of the beam is altered by reducing the cetral exposure area relative to the peripheral

A

flattening

28
Q

the angle through which an isodose curve is tilted at the central ray of a beam at a specified depth (usually 10cm) is called the

A

wedge angle

29
Q

T/F: the wedge factor is the ratio of the doses with and without the wedge inserted at a specified depth

A

true

30
Q

which type of wedge uses the motion of the collimator jaw or leaves during treatment delivery to modify the dose distribution

a. enhanced dynamic wedge
b. enhanced motorized wedge
c. physical wedge
d. motorized wedge

A

a. enhanced dynamic wedge

31
Q

T/F: MLC’s can create island blocks

A

false

32
Q

cerrobend blocks are compsoed of:

a. Pb, tin, cadmium, bismuth
b. Au, Pb, Ca, Bi
c. Al, tin, Pb, Copper
d. Pb, cerro

A

a. Pb, tin, cadmium, bismuth

33
Q

the melting point for cerrobend is

a. 100 degrees
b. 158 degrees
c. 165 degrees
d. 212 degrees

A

b. 158 degrees

34
Q

what type of beam modifiers can be used to address tissue irregularities for sloping surfaces but today can also be used for tissue inhomogeneities inside the body?

a. cerrobend
b. compensators
c. bolus
d. flattening filters

A

b. compensators

35
Q

bolus is used primarily to:

a. skin sparring
b. limit Dmax
c. block dose to certain areas
d. bring dose to the surface for treating superficial lesion

A

d. bring dose to the surface for treating superficial lesion

36
Q

as electron energy increase, skin dose _____

A

increases

37
Q

practical range

A

engery/2

38
Q

80% isodose line

A

energy/3

39
Q

90% isodose line

A

energy/4

40
Q

Pb cutout thickness for on skin electron blocking should be at least

A

MeV/2 in mm of Pb

41
Q

T/F: data registratio and fusion are the geometric alignment of images with one another

A

true

42
Q

T/F: axial scanning provides better resolution but helical scanning is faster and delivers less dose

A

true

43
Q

T/F: CT scans are used to create DRR’s

A

true

44
Q

disadvantages of using MRI include all of the following except

  • soft tissue imaging
  • lack of signal from bone
  • distrotions
  • no relation to electron density
  • artifacts
A

-soft tissue imaging

45
Q

T/F: PET scans provide information about physiology rather than anatomy

A

true

46
Q

most common PET radionuclide is

a. DFG
b. FDG
c. GFD
d. T99

A

b. FDG

47
Q

what are the 2 main types of image registrations?

a. vexing and convexing
b. formable and sharp
c. rigid and deformable
d. cumulative and recordable

A

c. rigid and deformable

48
Q

what is the main advantage for using deformable registration?

a. speed of registration
b. patient position does not have to be the same
c. patient position must be the same
d. computer memory used

A

b. patient position does not have to be the same

49
Q

IMRT stands for?

A

intensity modulated radiation therapy

50
Q

what best describes an IMRT treatment?

a. delivers non uniform fluence from the same beam angles to generate a conformal dose distribution
b. delivers non uniform fluence from different beam angles to generate a conformal dose distribution
c. delivers a uniform fluence from different beam angles to generate a non confomal dose distribution
d. delivers uniform fluence from different beam angles to gerneate a non uniform dose distribution

A

b. delivers non uniform fluence from different beam angles to generate a conformal dose distribution

51
Q

IMRT planning assigns non uniform intensities or weights to small subdivisions of beams referred to as

A

beamlets

52
Q

what type of planning concept does IMRT use

A

inverse

53
Q

IMRT is delivered most commonly using

A

MLC’s

54
Q

T/F: when treating using IMRT and using a step and shoot technique the leaves do not more when the beam is on

A

true

55
Q

VMAT stands for

A

volumetric modulated arc therapy

56
Q

T/F: when treating using VMAT technique radiation is delivered to the target while simultaneously moving the MLC’s and the gantry

A

true

57
Q

T/F: SRS treatment is usually given in 5 fractions

A

false

58
Q

SBRT stands for

A

sterotactic body radiation therapy

Computer Applications (1 decks)

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