Geometric Field Size
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The projection on a plane perpendicular to the beam axis. Usually the field
size defined by the light field.
Electron range at tissue inhomogeneities
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Coefficient of equivalent thickness (CET)
effective depth = actual depth - thickness of inhomogeneity(1-CET)
Low Dose and High Dose Regions in TSET
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TLDs used to account for body folds or regions of skin shielding.
High dose occurs at oblique surfaces.
Exposure Rate Constant (Radium)
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8.25 (R cm^2 mg^-1 h^-1)
0.825 (mR m^2 h^-1 mg^-1)
Percentage Depth Dose (PDD)
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PDD = (depth/reference depth) x 100%
Measurement of MV Beam Energy
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Can be measured directly with scintillation spectrometer or
photoactivation of electron foils but most commonly done with PDD in
water to published data.
MV vs kV beam specifications
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MV beams are specified in beam quality due to heavy filtration.
kV beams are specified in HVL and kVp.
Lead thickness to shield <10 MeV electrons
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5mm or less
Thickness = MeV/2 + 1mm for margin.
Effective Energy
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The equivalent energy of a x-ray beam is the energy of photons in a
monoenergetic beam that is attenuated at the same rate as the radiation in
question.
Give this one a try later!
The projection on a plane perpendicular to the beam axis. Usually the field
size defined by the light field.
Electron range at tissue inhomogeneities
,Give this one a try later!
Coefficient of equivalent thickness (CET)
effective depth = actual depth - thickness of inhomogeneity(1-CET)
Low Dose and High Dose Regions in TSET
Give this one a try later!
TLDs used to account for body folds or regions of skin shielding.
High dose occurs at oblique surfaces.
Exposure Rate Constant (Radium)
Give this one a try later!
8.25 (R cm^2 mg^-1 h^-1)
0.825 (mR m^2 h^-1 mg^-1)
Percentage Depth Dose (PDD)
Give this one a try later!
PDD = (depth/reference depth) x 100%
Measurement of MV Beam Energy
, Give this one a try later!
Can be measured directly with scintillation spectrometer or
photoactivation of electron foils but most commonly done with PDD in
water to published data.
MV vs kV beam specifications
Give this one a try later!
MV beams are specified in beam quality due to heavy filtration.
kV beams are specified in HVL and kVp.
Lead thickness to shield <10 MeV electrons
Give this one a try later!
5mm or less
Thickness = MeV/2 + 1mm for margin.
Effective Energy
Give this one a try later!
The equivalent energy of a x-ray beam is the energy of photons in a
monoenergetic beam that is attenuated at the same rate as the radiation in
question.
