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Danny's Tx Planning Lab > Quiz 1 (PPT2 & 3) > Flashcards

Quiz 1 (PPT2 & 3) Flashcards

1
Q

IM

A

Internal Margin

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2
Q

ITV

A

Internal Target Vol

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3
Q

SM

A

Setup Margin

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4
Q

TV

A

Treated Vol

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5
Q

PRV

A

Planning Organ at Risk Vol

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6
Q

IrV

A

Irridiated Vol

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7
Q

Visible mass to include lymphadenopathy and metastasis.

A

GTV

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8
Q

Subclinical malignant disease.

A

CTV

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9
Q

expanded margin for volume differences (bladder, rectum respiration, swallowing).

A

IM, internal margin

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10
Q

to include motion (CTV+IM).

A

ITV, internal target vol

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11
Q

Variation in daily patient positioning.

A

SM, setup margin

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12
Q

to include all geometric variations (ITV+SM).

A

PTV

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13
Q

Volume to encompass prescribed dose.

A

TV, treated vol

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14
Q

Similar to PTV except for OAR’s

A

PRV, Planning Organ at Risk Vol

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15
Q

Tissue that receives a dose that is considered significant in relation to normal tissue tolerance.

A

IrV

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16
Q

Isodose levels are modified by changing the ___, ___, ___, ___, etc., to produce a desired dose distribution.

A

energy
field size
beam arrangements
beam modifiers

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17
Q

Isodose levels are modified by changing the energy, field size, beam arrangements, beam modifiers, etc., to produce a desired dose distribution.

A

Isodose Distributions

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18
Q

Isodose Level Parameter: Isodose levels are lines that pass-through points of equal dose expressed as a ___ relative to a ___ ___.

A

%, reference point

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19
Q

Two-dimensional graph showing dose delivered to volumes of interest.

A

DVH

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20
Q

Physical penumbra= ___ + ___ + ___

A

Geometric, Transmission, Scatter

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21
Q

the lateral distance between two isodose lines at a specified depth

A

Penumbra

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22
Q

Penumbra Formula

A

s(SSD+d-SDD)/SDD

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23
Q

Penumbra Formula:

s=

A

Source size

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24
Q

Penumbra Formula:

SDD=

A

MLC, Block distance

25
Q

Penumbra Formula:

D=

A

Depth

26
Q

Effect on Penumbra:

Increase source size

A

Increase

27
Q

Effect on Penumbra:

Increase SSD

A

Increase

28
Q

Effect on Penumbra:

Increase depth

A

Increase

29
Q

Effect on Penumbra:

Increase SDD

A

Decrease

30
Q

Collimators produce scatter and ___ (increase/decrease?) penumbra.

A

increase

31
Q

___ ___ contribute to penumbra due to partial transmission through the ___ end

A

MLC leaves, leaf

32
Q

Some MLC’s create little penumbra when the leaves are mounted on ___ ___

A

diverging carriages

33
Q

___ leaves create constant penumbra with changing field sizes

A

Rounded

34
Q

DVH types:

(most often used) graphs the volume(in the Y-axis that receives the corresponding dose or more in the X-axis

A

Cumulative DVH

35
Q

DVH types:

graphs the volume of a structure receiving dose within a specified dose interval

A

Differential DVH

36
Q

When choosing an energy consider the following: (6)

A
  • Tumor location
    • Tumor size
    • Surrounding tissues
    • Skin sparring
    • Depth
    • Exit dose
37
Q

Two considerations when selecting beam arrangements:

A

OARs

Homogeneous dose within planning target

38
Q

How to get a homogeneous dose?

A

more beams

39
Q

Beam arrangements that are asymmetric usually require ___ or ___ to be homogenous

A

wedges, compensators

40
Q

Field Shape:

Cerrobend blocks have ___ (more/less?) field conformality than MLC’s due to the leaf size

A

more

41
Q

Field Shape:

The blocking must always be ___ than the target volume to account for ___

A

larger, penumbra

42
Q

Single field advantages: (3)

A

Simple setup
Uses SSD technique
Decreased treatment time

43
Q

Single field disadvantages: (2)

A

Limited treatment depth

Max doses

44
Q

Parallel opposed fields advantages: (4)

A

Simple setup
Decreased chance of geometric miss
Homogeneous dose
Ability to weight beams

45
Q

Parallel opposed fields disadvantages: (2)

A

Entry and exit doses

Difficult to avoid critical structures

46
Q

Multiple fields advantages: (3)

A

Dose conformality
Decreased max dose
Avoidance of critical organs

47
Q

Multiple fields disadvantages: (2)

A

More integral dose (total dose in body)

Difficult to avoid critical organs

48
Q 
Rotational therapy:
1, Best suited for \_\_\_, \_\_\_ tumors
2. Able to shape dose distribution based on \_\_\_ of arcs and \_\_\_ of arcs
3. \_\_\_ treatment time
4. \_\_\_ Conformality of doses
5. Varian linacs - type of arc:
6. Elekta linacs - type of arc:
A
  1. small, deep-seated
  2. number, degree
  3. Decreased
  4. Increased
  5. Rapidarc
  6. VMAT
49
Q

Partial arc therapy may require “Past-pointing” where the isocenter is placed ___ than the target

A

deeper

50
Q

Wedge field technique common uses:
1. Can account for ___ anatomy such as a chestwall or breast
2. ___ a beam such as a in a 3 field rectum
3. Use as tissue ___
4. Use for a ___ ___ target such as a rt sided brain tumor
Wedge/ Hinge angle
180 - 2(wedge angle)= hinge angle

A
  1. sloping
  2. Omit
  3. compensator
  4. one sided
51
Q

Matching fields techniques: (3)

A

Half beam on central axis
Angling adjacent beams
Match at desired depth (use gap calc)

52
Q

Matching fields used when: (5)

A
  1. Prior treatment to adjacent area
  2. 3-field head and neck treatment technique
  3. 3-field breast sclav treatment technique
  4. Craniospinal
  5. Mantle
53
Q

Wedge/ Hinge angle formula:

A

hinge angle = 180 - 2(wedge angle)

54
Q

___ ___ advantages:
Simple setup
Uses SSD technique
Decreased treatment time

A

Single Field

55
Q

___ ___ disadvantages:
Limited treatment depth
Max doses

A

Single Field

56
Q 
\_\_\_ \_\_\_ advantages:
Simple setup
Decreased chance of geometric miss
Homogeneous dose
Ability to weight beams
A

POP Fields

57
Q

___ ___ disadvantages:

A

Entry and exit doses

Difficult to avoid critical structures

58
Q

___ ___ advantages:
Dose conformality
Decreased max dose
Avoidance of critical organs

A

Multiple Fields

59
Q

___ ___ disadvantages:
More integral dose (total dose in body)
Difficult to avoid critical organs

A

Multiple Fields

Danny's Tx Planning Lab (6 decks)

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