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Table 1 Specifications of the high-contrast elements in the PTW QC phantom

From: Assessment of portal image resolution improvement using an external aluminum target and polystyrene electron filter

Dimensions (mm)

4

3

2

1.5

1

0.75

0.5

0.35

0.25

0.2

0.15

Resolution (lp/mm)

0.125

0.167

0.25

0.33

0.5

0.67

1

1.43

2

2.5

3.33

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Radiation Oncology

ISSN: 1748-717X

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