Any calculations for clinical use should be validated by hand
These calibrations used are machine specific and results are not applicable for other institutions
6MV15MV
Parameter Value Comments
Treatment Machine
Beam Energy/Modality
Input X1:
Input X2:

Jaw Settings X (in cm):		 *
*

 Both X and Y total should equal the sum of their respective independent jaw settings. (e.g. X = X1+X2). Independent jaws that cross the central axis (CAX) are to be written as a negative number.
Input Y1:
Input Y2:

Jaw Settings Y (in cm):		 *
*

 Both X and Y total should equal the sum of their respective independent jaw settings. (e.g. Y = Y1+Y2). Independent jaws that cross the central axis (CAY) are to be written as a negative number.
***NOTE!: Y1 is caudal and Y2 is cephalad
Jaw Equivalent Square (in cm)
Patient separation (in cm) For midplane calculation. Using the calipers, measure patient thickness: This is the patient separation.
Depth of Treatment, d (in cm) For midplane calculation. Using the calipers, measure patient thickness, d. d=patient separation/2
Prescribed Dose per Fraction (in cGy)
Number of Fields
Calibration Factor Use 0.85 cGy/MU for 6MV
Use 0.90 cGy/MU for 15/18 MV
Sc Using the Jaw Equivalent Square, look up in Sc table for the appropriate energy.
Sp Using the Irradiated Field Equivalent Square, look up the Sp table for the appropriate energy.
TPR Using the depth and the Irradiated Field Equivalent Square, look up in the TPR table for the appropriate energy.
Inverse Square Factor (ISF) For treatments, ISF = 1.00
For treatments, use: ISF = [100/(SSD+d)]2
SSD:
Block Tray Transmission Factor If using use 1.00
If using block, use 0.97 for 6MV, and 0.98 for 15/18 MV.
Monitor Units
 Use for each field.
Graticule
Visual confirmation of field shape.		 Double Check
Multiplying the target point by the dose in Gy yields the MU for one (of two) fields.
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