radiotherapy
問題一覧
1
• Deals with the measurements of the absorbed dose or dose rate resulting from the interaction of ionizing radiation with matter
radiation dosimetry
2
• Involves the measurement of radiation based on the changes in thermal energy per unit mass of the medium
• Based on the fact that almost all the energy deposited in the medium by the radiation beam eventually appears as heat within the medium
calorimetry
3
• Is based on chemical changes caused by radiation
frickle dosimetry
4
• When the x-ray film is exposed to ionizing radiation, the exposed silver bromide crystal form a latent image
• In the film development process, the affected crystals causes darkening of the film and the unaffected crystal leave the film clear
film dosimetry
5
• Measurement of radiation energy based on ion pairs produced in a given mass of medium
ionization method
6
• When a crystal is irradiated, a very minute fraction of the absorbed energy is stored in the crystal lattice
• Some of this energy can be recovered later as visible light if the material is heated
• This phenomenon of the release of visible photons by thermal means is known as Thermoluminiscence
thermoluminescence dosimetry
7
heating of TLD crystal to remove unwanted residual signal (400 ° C FOR 3 hours)
annealing
8
• a small cylindrical detector used in radiotherapy
thrimble chamber
9
• Defined as the ratio of the dose rate at the depth of maximum dose for the given field size to that for the reference field size (10 x10 cm 2) at its dmax
output factor
10
• It represents points of equal dose
• A set of these curves, normally given in 10% increments normalizes to the dose at the reference depth, can be plotted on a chart
• Dose profiles are particularly well suited to the description of field flatness and penumbra
isodose curve
11
• It is the absorbed dose at a given depth expressed as a percentage of the absorbed dose at a reference depth on the central axis of the field
percent depth dose PDD
12
• A general term used to refer to the effect on a material which is exposed to radiation
dose
13
• The radiation dose delivered per unit time
dose rate
14
• Defined generally as any device that is capable of providing a reading that is measured of the absorbed dose deposited in its sensitive volume by ionizing radiation
dosimeter
15
• Unit used in linear accelerator to determine the dose
• Linear accelerator is calibrated to 1 MU = 1 cGy
monitor unit
16
• Is tissue equivalent materials that have electron density, physical density, and atomic number similar to that of tissue or water
• Is placed directly on the skin surface to even out the irregular patient contour and thereby provide a flat surface for normal beam incidence
bolus
17
• Are used to produce the same effect as the bolus yet preserve the skin sparing effect of megavoltage photon beams
compensators
18
• May be used to even out the isodose surfaces for photon beams striking relatively flat patient surface under an oblique beam incidence
wedge filter
19
• Are used to shield organs at risk, made of lead or Lipowitz's med 10 Which consists of 13.3 % Tin, 50 % Bismuth, 26.7 % Lead and 10 % Cadmium.
blocks
magnetic resonance imaging 2
magnetic resonance imaging 2
Kenneth Manlapaz · 78問 · 1年前magnetic resonance imaging 2
magnetic resonance imaging 2
78問 • 1年前computed tomography
computed tomography
Kenneth Manlapaz · 46問 · 1年前computed tomography
computed tomography
46問 • 1年前interventional radiology 2
interventional radiology 2
Kenneth Manlapaz · 58問 · 1年前interventional radiology 2
interventional radiology 2
58問 • 1年前Radiationtherapy
Radiationtherapy
Kenneth Manlapaz · 79問 · 1年前Radiationtherapy
Radiationtherapy
79問 • 1年前computed tomography 2
computed tomography 2
Kenneth Manlapaz · 11問 · 1年前computed tomography 2
computed tomography 2
11問 • 1年前QAQC 2
QAQC 2
Kenneth Manlapaz · 33問 · 1年前QAQC 2
QAQC 2
33問 • 1年前POSI 2
POSI 2
Kenneth Manlapaz · 30問 · 1年前POSI 2
POSI 2
30問 • 1年前問題一覧
1
• Deals with the measurements of the absorbed dose or dose rate resulting from the interaction of ionizing radiation with matter
radiation dosimetry
2
• Involves the measurement of radiation based on the changes in thermal energy per unit mass of the medium
• Based on the fact that almost all the energy deposited in the medium by the radiation beam eventually appears as heat within the medium
calorimetry
3
• Is based on chemical changes caused by radiation
frickle dosimetry
4
• When the x-ray film is exposed to ionizing radiation, the exposed silver bromide crystal form a latent image
• In the film development process, the affected crystals causes darkening of the film and the unaffected crystal leave the film clear
film dosimetry
5
• Measurement of radiation energy based on ion pairs produced in a given mass of medium
ionization method
6
• When a crystal is irradiated, a very minute fraction of the absorbed energy is stored in the crystal lattice
• Some of this energy can be recovered later as visible light if the material is heated
• This phenomenon of the release of visible photons by thermal means is known as Thermoluminiscence
thermoluminescence dosimetry
7
heating of TLD crystal to remove unwanted residual signal (400 ° C FOR 3 hours)
annealing
8
• a small cylindrical detector used in radiotherapy
thrimble chamber
9
• Defined as the ratio of the dose rate at the depth of maximum dose for the given field size to that for the reference field size (10 x10 cm 2) at its dmax
output factor
10
• It represents points of equal dose
• A set of these curves, normally given in 10% increments normalizes to the dose at the reference depth, can be plotted on a chart
• Dose profiles are particularly well suited to the description of field flatness and penumbra
isodose curve
11
• It is the absorbed dose at a given depth expressed as a percentage of the absorbed dose at a reference depth on the central axis of the field
percent depth dose PDD
12
• A general term used to refer to the effect on a material which is exposed to radiation
dose
13
• The radiation dose delivered per unit time
dose rate
14
• Defined generally as any device that is capable of providing a reading that is measured of the absorbed dose deposited in its sensitive volume by ionizing radiation
dosimeter
15
• Unit used in linear accelerator to determine the dose
• Linear accelerator is calibrated to 1 MU = 1 cGy
monitor unit
16
• Is tissue equivalent materials that have electron density, physical density, and atomic number similar to that of tissue or water
• Is placed directly on the skin surface to even out the irregular patient contour and thereby provide a flat surface for normal beam incidence
bolus
17
• Are used to produce the same effect as the bolus yet preserve the skin sparing effect of megavoltage photon beams
compensators
18
• May be used to even out the isodose surfaces for photon beams striking relatively flat patient surface under an oblique beam incidence
wedge filter
19
• Are used to shield organs at risk, made of lead or Lipowitz's med 10 Which consists of 13.3 % Tin, 50 % Bismuth, 26.7 % Lead and 10 % Cadmium.
blocks