Table 4.

Comparison of wedge factors between water and Plastic Water ^a Diagnostic Therapy (DT) for a 6‐MV beam

Field size (cm)	Plastic Water DT	Water
	15‐Degree wedge
$10\times 10$	0.509	0.499
$20\times 20$	0.521	0.522
	45‐Degree wedge
$10\times 10$	0.711	0.714
$20\times 20$	0.724	0.723

^aCIRS, Norfolk, VA.