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US 12,618,967 B2Granted
Radar-based cross-sectional image reconstruction of subject
AssigneeOne Health Group, Inc.
InventorsRaghed El Bardan, Albert Di Rienzo, Dhaval Malaviya
Life of this patent
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Abstract
One or more aspects of this disclosure relate to the usage of an impulse radio ultra-wideband (IR-UWB) radar to reconstruct a cross-sectional image of subject in a noninvasive fashion. This image is reconstructed based on the pre- and post-processing of recorded waveforms that are collected by the IR-UWB radar, after getting reflected-off the subject. Furthermore, a novel process is proposed to approximate the different tissues' dielectric constants and, accordingly, reconstruct a subject's cross-sectional image.
Claims8
A process comprising:
- placing, at a first location of a subject, a housing comprising a radar transceiver;
- generating waveforms;
- transmitting, based on the placing at the first location and based on the generating the waveforms and via a transmit antenna of the radar transceiver, the waveforms;
- receiving as signals, via a receive antenna, reflections of the waveforms;
- processing the signals by:
- generating a time-delayed copy of the received signals;
- autocorrelating the received signals with the time-delayed copy of the received signals;
- determining, based on the autocorrelated signals, a k-point moving average;
- and
- blocking a direct current (DC) component by subtracting the k-point moving average from each signal of the autocorrelated signals;
- storing, in a storage, the autocorrelated signals with the blocked DC component;
- placing, at a second location of the subject, the housing;
- and
- repeating the transmitting, receiving, processing, and storing steps for signals received at the second location.
11 more elements
An apparatus comprising:
- a radar transceiver configured to generate waveforms;
- a transmit antenna connected to the radar transceiver, wherein the transmit antenna is configured to transmit the generated waveforms;
- a receive antenna;
- a memory storing instructions;
- one or more processors connected to the receive antenna and configured to, when executing the instructions, cause the apparatus to:
- transmit, at a first time period, the generated waveforms;
- receive as first signals, via the receive antenna, first reflections of the waveforms;
- process the first signals by causing the apparatus to:
- generate a first time-delayed copy of the received first signals;
- autocorrelate the received first signals with the first time-delayed copy of the received first signals;
- determine, based on the first autocorrelated signals, a first k-point moving average;
- and
- block a first direct current (DC) component by subtracting the first k-point moving average from each signal of the first autocorrelated signals;
- store, in a storage, the first autocorrelated signals with the blocked DC component;
- transmit, at a second time period, the generated waveforms;
- receive as second signals, via the receive antenna, second reflections of the waveforms;
- process the second signals by causing the apparatus to:
- generate a second time-delayed copy of the received second signals;
- autocorrelate the received second signals with the second time-delayed copy of the received second signals;
- determine, based on the second autocorrelated signals, a second k-point moving average;
- and
- block a second direct current (DC) component by subtracting the second k-point moving average from each signal of the second autocorrelated signals;
- and
- store, in the storage, the second autocorrelated signals with the blocked DC component.
21 more elements
A process comprising:
- receiving, via a receive antenna positioned at a first location on a subject and as first signals, first reflections of waveforms;
- processing the first signals by:
- sampling the first signals as M signals in N sampling time units, wherein the N sampling time units represent N-elements in a received waveform b_i, where ∀i∈{1, 2, . . . , M};
- for each M signal,
- determining distances at which the N-elements are sampled;
- and
- determining a reflection coefficient, Γ_(i,j), of each of the N-elements at a j-th medium boundary between mediums;
- determining, for each medium, a dielectric constant of the medium ∀j using a vector network analyzer;
- and
- constructing an M×N matrix, E, of the determined dielectric constants;
- receiving, via the receive antenna positioned at a second location on a subject and as second signals, second reflections of the waveforms;
- and
- repeating the processing for the second signals.
10 more elements
An apparatus comprising:
- a radar transceiver configured to generate waveforms;
- a transmit antenna connected to the radar transceiver, wherein the transmit antenna is configured to transmit the generated waveforms;
- a receive antenna;
- a memory storing instructions;
- one or more processors connected to the receive antenna and configured to, when executing the instructions, cause the apparatus to:
- receive, at a first time period via the receive antenna as first signals, first reflections of the generated waveforms;
- process the first signals by causing the apparatus to:
- sample the first signals as M signals in N sampling time units, wherein the N sampling time units represent N-elements in a received waveform b_i, where ∀i∈{1, 2, . . . , M};
- for each M signal,
- determine distances at which the N-elements are sampled;
- and
- determine a reflection coefficient, Γ_(i,j), of each of the N-elements at a j-th medium boundary between mediums;
- determine, for each medium, a dielectric constant of the medium ∀j using a vector network analyzer;
- and
- construct an M×N matrix, E, of the determined dielectric constants;
- receive, at a second time period via the receive antenna as second signals, second reflections of the generated waveforms;
- and
- repeating the process for the second signals.
15 more elements
Dependencies are inferred from the claim text.