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Table 1 Settings of the strain estimation algorithm

From: Feasibility and relevance of compound strain imaging in non-stenotic arteries: comparison between individuals with cardiovascular diseases and healthy controls

 

Iteration 1

Iteration 2

Iteration 3

Iteration 4y

Strain Estimation

Data input

Envelope

RF data

RF data

RF data

Radial displacements

Pre-kernel size (mm x mm)

1.3 × 0.6a

0.6 × 0.6a

0.3 × 0.6a

0.3 × 0.6a

-

Post-kernel size (mm x mm)

1.9 × 1.8a

0.9 × 1.8a

0.5 × 1.8a

0.5 × 1.8a

-

Axial kernel overlap (%)

80

80

80

80

-

Lateral kernel overlap (%)

67

67

67

67

-

Median filter size (mm x mm)

2.2 × 1.8a

1.1 × 1.8a

0.6 × 1.8a

0.9 × 0.6az

0.6 × 0.6az

21° × 0.5 mmx

2D least squares strain estimator size (° x mm)

-

-

-

-

9° × 0.5 mmx

  1. aAxial x lateral direction; y with sub-sample aligning (24); z-filter settings after compounding (15) for the cumulated horizontal and vertical displacements, respectively; x-filter sizes defined in circumferential x radial direction, because of conversion to polar grid with a spacing of 1° circumferentially and 100 μm radially (22)