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EURASIP Journal on Advances in Signal Processing

Table 2 Relationship among ILO standard grades for rounded opacities and the size in mm, size in pixels and range in frequency

From: Recent multiscale AM-FM methods in emerging applications in medical imaging

Type of rounded opacities

Range in mm

Range in pixels

Range in lowest frequency content

P

Up to 1.5

Up to 18

[π/9, π]

q

1.5-3

18-36

[π/18, π/9]

r

3-10

36-120

[π/36, π/18]

  1. Relationships are based on a scanning rate of 12 pixels per mm. Frequency range refers to the cut-off frequencies that can be used to characterize an opacity [67].
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