# US 12,008,705 B2 · X-ray tomography system and method

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- Number: US 12,008,705 B2
- Document ID: US12008705B2
- Status: Granted
- Kind: B2
- Application number: 17/672,601
- Filed: 2022-02-15
- Published: 2022-06-02
- Granted: 2024-06-11
- Earliest claimed: 2019-08-16
- Assignees: Adaptix, Inc.
- Applicants: Adaptix Ltd
- Inventors: Vadim Soloviev
- Web page: https://patentgrep.com/patent/US12008705B2

## CPC

- G06T 12/20: Inverse problem, i.e. transformations from projection space into object space
- G06T 15/08: Volume rendering
- A61B 6/02: Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B 6/4007: {characterised by using a plurality of source units}
- A61B 6/4085: {Cone-beams}
- A61B 6/5205: {involving processing of raw data to produce diagnostic data}
- G06T 7/0012: {Biomedical image inspection}
- G06T 2207/10076: 4D tomography; Time-sequential 3D tomography
- G06T 2211/421: Filtered back projection [FBP]
- G06T 2211/436: Limited angle
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

The majority of image reconstruction algorithms are common to DT and CT, and require reconstruction volume allocation and are based on ray tracing techniques. Reconstructed three-dimensional images become available only after the entire volume is processed and the algorithm completes. The present invention performs reconstruction on a slice-by-slice basis, instead of waiting for completion of the algorithm by back-projecting each pixel in each attenuation image towards the emitter that generated that image, onto a selected reconstruction slice and determining a proportion of overlap with grid cells in the slice to obtain weighting factors in order to calculate an average back-projected intensity for each grid cell in the selected reconstruction slice.

## Claims

### Claim 1

A method of producing a tomogram, the method comprising the steps of:
providing an x-ray detector panel comprising a plurality of pixels;
providing an x-ray emitter panel spaced from the x-ray detector panel, the emitter panel comprising a plurality of x-ray emitters;
identifying relative locations of the emitters and pixels relative to each other;
emitting a respective cone of x-ray radiation from each emitter toward the detector panel;
producing respective attenuation images at the detector panel in response to each respective cone of x-ray radiation impinging the detector panel; and
reconstructing a density function indicative of attenuation of the x-ray radiation by:
selecting a reconstruction slice corresponding to a plane located between the detector and emitter panels;
providing an array of grid cells on the reconstruction slice;
in response to selecting the reconstruction slice: for each respective attenuation image, back-projecting each pixel in the respective attenuation image back towards the respective emitter for that attenuation image onto the reconstruction slice and determining a proportion of overlap of that back-projected pixel with each grid cell to obtain a plurality of weighting factors comprising a respective weighting factor for each grid cell for that back-projected pixel;
using the plurality of weighting factors for each back-projected pixel in each attenuation image to calculate an average back-projected intensity for each grid cell in the selected reconstruction slice to produce an average intensity image for the selected reconstruction slice; and
convolving the average intensity image with a ramp filter to obtain the density function within the selected reconstruction slice.

### Claim 2

A system for producing a tomogram, the system comprising:
an x-ray emitter panel comprising a plurality of x-ray emitters, each emitter configured to emit a respective cone of x-ray radiation;
an x-ray detector panel comprising a plurality of pixels, the x-ray detector panel spaced from the x-ray emitter panel and configured to produce respective attenuation images in response to each respective cone of x-ray radiation impinging the detector panel from the x-ray emitter panel;
a spatial location system for identifying relative locations of the emitters and pixels relative to each other; and
a processor for reconstructing a density function indicative of attenuation of the x-ray radiation by:
selecting a reconstruction slice corresponding to a plane located between the detector and emitter panels;
providing an array of grid cells on the reconstruction slice;
in response to selecting the reconstruction slice: for each respective attenuation image, back-projecting each pixel in the respective attenuation image back towards the respective emitter for that attenuation image onto the reconstruction slice and determining a proportion of overlap of that back-projected pixel with each grid cell to obtain a plurality of weighting factors comprising a respective weighting factor for each grid cell for that back-projected pixel;
using the plurality of weighting factors for each back-projected pixel in each attenuation image to calculate an average back-projected intensity for each grid cell in the selected reconstruction slice to produce an average intensity image for the selected reconstruction slice; and
convolving the average intensity image with a ramp filter to obtain the density function within the selected reconstruction slice.