def main():
# Here starts communication with the device.
with arrus.Session() as sess:
us4r = sess.get_device("/Us4R:0")
us4r.set_hv_voltage(10)
n_elements = us4r.get_probe_model().n_elements
# Full transmit aperture, full receive aperture.
seq = TxRxSequence(
ops=[
TxRx(
Tx(
aperture=[True] * n_elements,
excitation=Pulse(center_frequency=6e6,
n_periods=2,
inverse=False),
# Custom delays 1.
delays=[0] * n_elements),
Rx(aperture=[True] * n_elements,
sample_range=(0, 2048),
downsampling_factor=1),
pri=200e-6),
],
# Turn off TGC.
tgc_curve=[14] * 200, # [dB]
# Time between consecutive acquisitions, i.e. 1/frame rate.
sri=50e-3)
# Declare the complete scheme to execute on the devices.
scheme = Scheme(
# Run the provided sequence.
tx_rx_sequence=seq,
# Processing pipeline to perform on the GPU device.
processing=Pipeline(
steps=(RemapToLogicalOrder(), SelectFrames([0]), Squeeze(),
Lambda(lambda data: data -
(data.mean(axis=0).astype(np.int16)))),
placement="/GPU:0"))
# Upload the scheme on the us4r-lite device.
buffer, metadata = sess.upload(scheme)
# Created 2D image display.
display = Display2D(metadata=metadata, value_range=(-1000, 1000))
# Start the scheme.
sess.start_scheme()
# Start the 2D display.
# The 2D display will consume data put the the input queue.
# The below function blocks current thread until the window is closed.
display.start(buffer)
print("Display closed, stopping the script.")
# When we exit the above scope, the session and scheme is properly closed.
print("Stopping the example.")
sequence = StaSequence(
tx_aperture_center=np.linspace(-15, 15, 11)*1e-3,
tx_aperture_size=32,
tx_focus=-6e-3,
pulse=Pulse(center_frequency=6e6, n_periods=2, inverse=False),
rx_sample_range=(0, 2048),
downsampling_factor=2,
speed_of_sound=1450,
pri=200e-6,
tgc_start=14,
tgc_slope=2e2)
# Imaging output grid.
x_grid = np.arange(-15, 15, 0.2) * 1e-3
z_grid = np.arange(5, 45, 0.2) * 1e-3
scheme = Scheme(
tx_rx_sequence=sequence,
processing=get_bmode_imaging(sequence=sequence, grid=(x_grid, z_grid)))
# Upload sequence on the us4r-lite device.
buffer, metadata = sess.upload(scheme)
display = Display2D(metadata=metadata, value_range=(20, 80), cmap="gray",
title="B-mode", xlabel="OX (mm)", ylabel="OZ (mm)",
extent=get_extent(x_grid, z_grid)*1e3,
show_colorbar=True)
sess.start_scheme()
display.start(buffer)
# When we exit the above scope, the session and scheme is properly closed.
print("Stopping the example.")