SSD Calculations

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SSD Calculations por Mind Map: SSD Calculations

1. Cobalt-60

1.1. Calibrated conditions @ Nominal

1.1.1. FS @ (10cm^2)

1.1.2. SSD=80cm

1.1.3. Time= (Prescribed Dose/(Dose Rate in air)(BSF)(FSD)

1.1.3.1. BSF

1.1.3.2. FSD

1.1.4. [email protected] DMAX 80.5 cm

1.1.5. Dmax =.5cm

1.2. Non-Calibrated Conditions  @ Nominal  with Depth Change

1.2.1. FS @ (10cm^2)

1.2.2. SSD=80cm

1.2.3. Time= Prescribed Dose/Dose Rate in air(BSF)(FSD)(%DD/100)

1.2.3.1. FSD

1.2.3.2. BSF

1.2.3.3. %DD/100

1.2.4. Dmax =.5cm

1.2.5. [email protected] DMAX 80.5 cm

1.3. Extended SSD Not @Nominal

1.3.1. ISF=(SSD1+Dmax/SSD2+Dmax)^2

1.3.2. %[email protected]/[email protected]

1.3.3. Time=Prescribed Dose /(Dose in air)/([email protected])([email protected](SSD1)(ISF)(%DD/100)

1.3.4. Mayneord F= (SSD1+Depth/SSD2+Depth)^2(SSD2+Dmax/SSD1+Dmax)^2

2. Linac (6mv 8mv)

2.1. Calibrated Conditions @Nominal

2.1.1. FS=10cm^2

2.1.2. SSD=100cm

2.1.3. MU=Prescribed Dose/(1cGy/MU )(Sc)(Sp)or (OPF)

2.1.3.1. Sc , Sp

2.1.3.2. OPF

2.1.4. 6MV Dmax=1.5cm

2.1.5. 18MV Dmax=3.5cm

2.1.6. In Phantom

2.1.7. SSD @Dmax=101.5 or 103.5 cm

2.2. Non-Calibrated [email protected] Nominal with Depth Change

2.2.1. 6MV Dmax=1.5cm

2.2.2. FS=10cm^2

2.2.3. SSD=100cm

2.2.4. MU=Prescribed dose/(1cGy)(OPF) or (Sp)(Sc)(%DD/100)

2.2.4.1. Sc , Sp

2.2.4.2. OPF

2.2.4.3. %DD/100

2.2.5. 18MV Dmax=3.5cm

2.2.6. In Phantom

2.2.7. SSD @Dmax=101.5 or 103.5 cm

2.3. Extended SSD Not @ Nominal

2.3.1. %[email protected]/[email protected]

2.3.2. PSF

2.3.3. MU=Prescribed dose/(dose [email protected])([email protected])( ([email protected]/[email protected])(ISF)(%[email protected]/100)

2.3.4. MU=Prescribed dose/(dose [email protected])([email protected])([email protected])(SSD1+Dmax/SS2+Dmax)(%[email protected]/100)

2.3.5. Mayneord F= (SSD1+Depth/SSD2+Depth)^2(SSD2+Dmax/SSD1+Dmax)^2

2.3.6. ISF=(SSD1+Dmax/SSD2+Dmax)^2

3. Sterling formula (rectangular field to square field) 2(L*W)/L+W)