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16 Cards in this Set
- Front
- Back
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PDD definition |
PDD(d, f, SSD)= Dose at depth d / Dose at depth d_m |
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Mayneord Factor |
used to correct PDD from lookup table for non 100SSD |
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Tissue to Air Ratio (TAR) |
used when SSD ≠ SAD =100cm TAR(d, f)= Dose at depth d / Dose at depth d in free space |
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Peak Scatter Factor (PSF) |
PSF tells the enhancement in dose going from free space to in phantom PSF(f) = D(d_m) / D(fs) = TAR(d_m) |
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Tissue Maximum Ratio (TMR) |
TMR (d, f) = D_d (r,f) / D_d_m (r, f) |
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TMR relationship with TAR and PSF |
TMR = TAR / PSF |
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Equivalent Square Formula |
f=4*Area/Perimeter for rectangle: f=2ab/(a+b) |
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PDD: increases as beam energy |
increases |
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PDD: increases as field size |
increases |
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PDD: increases as SSD |
increases |
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PDD: increases as depth |
decreases
(inverse square law and attenuation by matter) |
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TAR: increases as beam energy |
increases |
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TAR: increases as depth |
decreases |
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TAR: increases as field size |
increases |
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PDD to TMR |
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PDD to TAR |
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