Phase Aberration
By Mark A. Haun, Ph. D.
Data Sets:
ats
ats_2ab1
ats_4ab1
ats_slab
ats_wire
mouseab
mouseab2
rabbit_ribs
rat_liver
rat_tumor
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).
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