. 2014 Mar 6;15(2):205–225. doi: 10.1120/jacmp.v15i2.4685

Table 1.

Summary of required beam measurements

	Algorithm
Parameter	Pencil Beam	Monte Carlo
Central Axis Profiles	Percent Depth Dose in water at 100 cm SSD for square fields $1 \times 1$ to $15 \times 15 {cm}^{2}$	Percent Depth Dose in water at 90 cm SSD for fields $1 \times 1$ to $15 \times x 15 {cm}^{2}$
Central Axis Profiles		CAX profiles in air for source‐to‐detector distances (SDD) of 85 to 115 cm for fields $1 \times 1$ to $15 \times 15 {cm}^{2}$
Off‐Axis Profiles	Diagonal Radial Profile in water at 100 cm SSD at depths from 0.5 to 350 cm, for a fully open $15 \times 15 {cm}^{2}$ field	Inline and crossline profiles in water for 90 and 100 cm SSD at depths of 1.5, 10, and 20 cm, for square and rectangular fields $1 \times 1$ to $15 \times 15 {cm}^{2}$
Off‐Axis Profiles		Inline and crossline profiles in air for source‐to‐detector distances (SDD) of 85, 100, and 115 cm for square and rectangular fields $1 \times 1$ to $15 \times 15 {cm}^{2}$
Scatter Factors	Measurements in water at 100 cm SSD and a depth of 10 cm for square fields $1 \times 1$ to $15 \times 15 {cm}^{2}$ relative to a $10 \times 10 {cm}^{2}$ field	Measurements in water at 90 cm SSD and a depth of 10 cm for square and rectangular fields $1 \times 1$ to $15 \times 15 {cm}^{2}$ relative to a $10 \times 10 {cm}^{2}$ field
Scatter Factors		Measurements in air for a source‐to‐detector distance (SDD) of 100 cm for square and rectangular fields $1 \times 1$ to $15 \times 15 {cm}^{2}$ relative to a $10 \times 10 {cm}^{2}$ field
MLC Leakage	Measurement in water at 100 cm SSD and a depth of 10 cm with MLC completely closed relative to an open $15 \times 15 {cm}^{2}$ field
Absolute Dose	Gy/MU in water at 100 cm SSD, at a depth of 10 cm, for a $10 \times 10 {cm}^{2}$ field	Gy/MU in water at 90 cm SSD, at a depth of 10 cm, for a $10 \times 10 {cm}^{2}$ field