Phase Aberration

By Mark A. Haun, Ph. D.

Data Sets:

ATS

Target description:
ATS #539 tissue-mimicking phantom; c = 1450 m/s. Background scatter, wires, anechoic cysts (8, 6, 4, 3, and 2 mm), and 15-mm graduated scattering cysts.

Aberration:
None.

Data format:
64x64x5002 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (5002), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 200x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: ats.m, uses data file bpf2.mat.

Download:
ats.bin (40 MB).

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ats_2ab1

Target description:
ATS #539 tissue-mimicking phantom; c = 1450 m/s. Background scatter, wires, anechoic cysts (8, 6, 4, 3, and 2 mm), and 15-mm graduated scattering cysts.

Aberration:
Rippled RTV silicone rubber:
c = 1100 m/s
3-mm max. thickness
1-mm peak-to-peak ripple
2.4-mm correlation length
6-mm stand-off distance from transducer

Data format:
64x64x5002 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (5002), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 160x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: ats_2ab1.m, uses data file bpf2.mat.

Download:
ats_2ab1.bin (40 MB).

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ats_4ab1

Target description:
ATS #539 tissue-mimicking phantom; c = 1450 m/s. Background scatter, wires, anechoic cysts (8, 6, 4, 3, and 2 mm), and 15-mm graduated scattering cysts.

Aberration: Rippled RTV silicone rubber:
c = 1100 m/s
4-mm max. thickness
2-mm peak-to-peak ripple
2.9-mm correlation length
9-mm stand-off distance from transducer

Data format:
64x64x5002 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (5002), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 200x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: ats_4ab1.m, uses data file bpf2.mat.

Download:
ats_4ab1.bin (40 MB).

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ats_slab

Target description:
ATS #539 tissue-mimicking phantom; c = 1450 m/s. Background scatter, wires, anechoic cysts (8, 6, 4, 3, and 2 mm), and 15-mm graduated scattering cysts.

Aberration:
Flat slab of RTV silicone rubber:
c = 1100 m/s
18-mm thick
4-mm stand-off distance from transducer

Data format:
64x64x10002 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (10002), then receive element number (64), then transmit element number (64).

Temporal sampling:
20 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 300x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: ats_slab.m, uses data file bpf2.mat.

Download:
ats_slab.bin (80 MB).

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ats_wires

Target description:
ATS #539 tissue-mimicking phantom; c = 1450 m/s. Background scatter with embedded wires.

Aberration:
None.

Data format:
64x64x5002 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (5002), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 200x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: ats_wires.m, uses data file bpf2.mat.

Download:
ats_wires.bin (40 MB).

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mouseab

Target description:
Mouse abdomen, transverse plane.

Aberration:
None artificially added.

Data format:
64x64x502 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (502), then receive element number (64), then transmit element number (64).

Temporal sampling:
10 MHz rate (transducer center frequency 2.6 MHz); first sample at 24.95 µs; 200x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Correct 64-signal monostatic subset by scaling and time-shifting; interpolate to 40 MHz. MATLAB code: mouseab.m.

Download:
mouseab.bin (4 MB).

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mouseab2

Target description:
Mouse abdomen, transverse plane.

Aberration:
None artificially added.

Data format:
64x64x502 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (502), then receive element number (64), then transmit element number (64).

Temporal sampling:
10 MHz rate (transducer center frequency 2.6 MHz); first sample at 14.95 µs; 200x averaging.

Spatial sampling:
315 µm pitch.

Recommended pre-processing:
Correct 64-signal monostatic subset by scaling and time-shifting; interpolate to 40 MHz. MATLAB code: mouseab2.m.

Download:
mouseab2.bin (4 MB).

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rabbit_ribs

Target description:
ATS #539 tissue-mimicking phantom; c = 1450 m/s. Background scatter, wires, anechoic cysts (8, 6, 4, 3, and 2 mm), and 15-mm graduated scattering cysts.

Aberration:
2-cm-thick section of rabbit chest wall, oriented so the scan plane cuts across several ribs; 1-cm stand-off distance from transducer.

Data format:
64x64x5002 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (5002), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 100x averaging.

Spatial sampling:
315 µm pitch.

Recommended processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: rabbit_ribs.m, uses data file bpf2.mat.

Download:
rabbit_ribs.bin (40 MB).

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rat_liver

Target description:
Rat abdomen, transverse plane.

Aberration:
None artificially added.

Data format:
64x64x2502 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (2502), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 150x averaging.

Spatial sampling:
315 µm pitch.

Recommended processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: rat_liver.m, uses data file bpf2.mat.

Download:
rat_liver.bin (20 MB).

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rat_tumor

Target description:
Rat mammary tumor.

Aberration:
None artificially added.

Data format:
64x64x2502 array of 16-bit signed integers, big endian, no header; "fast" dimension is time (2502), then receive element number (64), then transmit element number (64).

Temporal sampling:
25 MHz rate (transducer center frequency 2.6 MHz); first sample at 0 µs; 200x averaging.

Spatial sampling:
315 µm pitch.

Recommended processing:
Band-pass filter in time; dip filter in space-time; correct 64-signal monostatic subset by scaling and time-shifting. MATLAB code: rat_tumor.m, uses data file bpf2.mat.

Download:
rat_tumor.bin (20 MB).