Definitions Flashcards

(28 cards)

1
Q

Percent depth dose

A

the ratio of dose at depth in tissue to the dose at electronic equilibrium on the beam axis. The ratio of dose at Dmax to dose at a certain depth in tissue.

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2
Q

Hypertension

A

a dizzy feeling associated with sitting or standing after a prolonged period of bed rest

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3
Q

Usage factor

A

the fraction of TIME in a treatment day in which a beam will be pointed at a particular barrier

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4
Q

Workload

A

the OUTPUT of the linac in a day

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5
Q

Occupancy factor

A

the fraction of time in a day a person will be OCCUPYING a space behind a particular barrier

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6
Q

Dose profile

A

a representation of the dose in an irradiated volume, as a function of spatial position along a single line

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7
Q

Linear attenuation coefficient (u)

A

fraction of photons attenuated per unit thickness

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8
Q

The shape of the isodose curves depends largely on two things:

A

field size and flattening filters

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9
Q

Irradiated volume

A

the volume larger than the treatment volume receiving some significant dose

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10
Q

Tumor volume

A

the actual physical dimensions of the tumor, including regions of presumed occult spread

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11
Q

As SSD increases, the depth dose….

A

increases

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12
Q

Exposure is measured in

A

C/ kg

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13
Q

Rad is measured in

A

J/ kg

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14
Q

Stopping power

A

the rate of kinetic energy lost per unit path length

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15
Q

Compton interaction is independent from…..

A

atomic number. Only photon and free electron

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16
Q

Pair production is ____ photon interaction with the nucleus.

17
Q

Isodose curve

A

points within the patient receiving the same dose are joined together forming a curve

18
Q

What is the tolerance for daily check of linac output consistency?

19
Q

Pancytopenia

A

side effect from chemo that decreases in many cellular components of the blood

20
Q

Ovarian cancer signs are (3):

A

abdominal bloating, nausea, constipation. NOT VAGINAL BLEEDING

21
Q
  • Early stage ovarian is treated with:

- Late stage ovarian is treated with:

A
  • Surgery and then chemo

- EBRT

22
Q

Early endometrial cancer sign is

A

abnormal vaginal bleeding

23
Q

Cisplatin can cause what loss?

24
Q

Half-value thickness

A

is the thickness of material that reduces beam intensity to half its original value

25
What factor controls the contrast of an image?
Window width
26
What factor controls the brightness of an image?
window level
27
Linear Energy Transfer
rate that energy is deposited as it travels through matter
28
- What is Oxygen Enhancement Ratio? | - What is the formula?
- compares the response of the cells to radiation with and without the presence of oxygen - Anoxic/ oxic