# US 12,182,962 B2 · Compression of CT reconstruction images > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,182,962 B2 - Document ID: US12182962B2 - Status: Granted - Kind: B2 - Application number: 18/456,215 - Filed: 2023-08-25 - Published: 2023-12-28 - Granted: 2024-12-31 - Earliest claimed: 2020-11-30 - Assignees: James R. Glidewell Dental Ceramics, Inc. - Applicants: James R. Glidewell Dental Ceramics, Inc. - Inventors: Fedor Chelnokov; Grant Karapetyan - Web page: https://patentgrep.com/patent/US12182962B2 ## CPC - A61B 6/5205: {involving processing of raw data to produce diagnostic data} - G06T 3/40: Scaling of whole images or parts thereof, e.g. expanding or contracting - G06T 12/30: Image post-processing, e.g. metal artefact correction - A61B 6/032: {Transmission computed tomography [CT]} - G06T 2200/04: involving 3D image data - G06T 2210/41: Medical - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract A computer-implemented method and system compresses CT reconstruction images and can include: receiving a volumetric density file including one or more voxels; replacing one or more voxel density values below an air density value with the air density value; replacing one or more voxel density values above a material density value with the material density value; determining one or more voxels of interest; replacing one or more non-interesting voxel density values below a material surface density with the air density value; replacing one or more non-interesting voxel density values above the material surface density with the material density value; quantizing all voxels to provide a reduced volume image; and compressing the reduced volume image to provide a compressed volume image. ## Claims ### Claim 1 A computer-implemented method of compressing CT reconstruction images, comprising: receiving a volumetric density file comprising one or more voxels, each comprising a voxel density value; replacing a first set of voxel density values below an air density value with the air density value; replacing a second set of voxel density values above a material density value with the material density value; quantizing all voxels of the one or more voxels to provide a reduced volume image; and compressing the reduced volume image to provide a compressed volume image. ### Claim 2 (depends on 1) The method of claim 1, wherein the volumetric density file is of a CT scanned physical impression. ### Claim 3 (depends on 2) The method of claim 2, wherein the physical impression comprises an impression material. ### Claim 4 (depends on 1) The method of claim 1, wherein a third set of voxels comprise one or more material surface voxels, the one or more material surface voxels comprising one or more voxels having immediate six neighbors with density values above and below a material surface density. ### Claim 5 (depends on 4) The method of claim 4, wherein material surface voxels further comprise one or more voxels within a fixed distance of each material surface voxel. ### Claim 6 (depends on 5) The method of claim 5, wherein the fixed distance is 5 voxels. ### Claim 7 (depends on 1) The method of claim 1, wherein quantizing comprises a lower bit-count than 16 bits per voxel. ### Claim 8 (depends on 7) The method of claim 7, wherein the lower bit-count is 8 bits per voxel. ### Claim 9 A system of compressing computed tomography (CT) reconstruction images, comprising: a processor; a computer-readable storage medium comprising instructions executable by the processor to perform steps comprising: receiving a volumetric density file comprising one or more voxels, each comprising a voxel density value; replacing a first set of voxel density values below an air density value with the air density value; replacing a second set of voxel density values above a material density value with the material density value; quantizing all voxels of the one or more voxels to provide a reduced volume image; and compressing the reduced volume image to provide a compressed volume image. ### Claim 10 (depends on 9) The system of claim 9, wherein the volumetric density file is of a CT scanned physical impression. ### Claim 11 (depends on 10) The system of claim 10, wherein the physical impression comprises an impression material. ### Claim 12 (depends on 9) The system of claim 9, wherein one or more material surface voxels comprises one or more voxels having immediate six neighbors with density values above and below a material surface density. ### Claim 13 (depends on 12) The system of claim 12, wherein material surface voxels further comprise one or more voxels within a fixed distance of each material surface voxel. ### Claim 14 (depends on 13) The system of claim 13, wherein the fixed distance is 5 voxels. ### Claim 15 (depends on 9) The system of claim 9, wherein quantizing comprises a lower bit-count than 16 bits per voxel. ### Claim 16 (depends on 15) The system of claim 15, wherein the lower bit-count is 8 bits per voxel. ### Claim 17 A non-transitory computer readable medium storing executable computer program instructions for compressing computed tomography (CT) reconstruction images, the computer program instructions comprising instructions for: receiving a volumetric density file comprising one or more voxels, each comprising a voxel density value; replacing a first set of voxel density values below an air density value with the air density value; replacing a second set of voxel density values above a material density value with the material density value; quantizing all voxels of the one or more voxels to provide a reduced volume image; and compressing the reduced volume image to provide a compressed volume image. ### Claim 18 (depends on 17) The medium of claim 17, wherein the volumetric density file is of a CT scanned physical impression. ### Claim 19 (depends on 17) The medium of claim 17, wherein a third set of voxels comprise one or more material surface voxels, comprises one or more voxels having immediate six neighbors with density values above and below a material surface density. ### Claim 20 (depends on 19) The medium of claim 19, wherein material surface voxels further comprise one or more voxels within a fixed distance of each material surface voxel.