Out-of-view CT scan detection
Computer-implemented method and system automatically detects an out-of-view CT scan by receiving a voxel density file, determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file, and evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view.
1. A computer-implemented method to automatically detect an out-of-view Computed Tomography (CT) scan, comprising:
receiving a voxel density file;
determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file; and
evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view,
wherein evaluating comprises determining a lateral out-of-view shift,
wherein determining a lateral out-of-view shift comprises determining a horizontal slice comprising a longest continuous arc of intersection between a view cylinder boundary and voxels above the threshold iso-value of density is above a lateral out-of-view shift threshold.
2. The method of claim 1 , wherein the lateral out-of-view shift threshold comprises a percentage of the longest continuous arc of intersection length of a view cylinder boundary length.
3. The method of claim 2 , wherein the lateral out-of-view shift threshold is at least 4% up to 100%.
4. The method of claim 1 , further comprising notifying an operator of the out-of-view scan.
5. The method of claim 1 , wherein the one or more scanned objects comprises one or more physical dental impressions.
6. A computer-implemented method to automatically detect an out-of-view Computed Tomography (CT) scan, comprising:
receiving a voxel density file;
determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file; and
evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view, wherein evaluating comprises determining a top out-of-view shift,
wherein determining the top out-of-view shift comprises evaluating a top horizontal slice of the voxel density file to determine whether the number of pixels above the threshold iso-value exceeds a top out-of-view shift threshold.
7. The method of claim 6 , wherein the top out-of-view shift threshold is at least 5% up to 100%.
8. A computer-implemented method to automatically detect an out-of-view Computed Tomography (CT) scan, comprising:
receiving a voxel density file;
determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file; and
evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view,
wherein evaluating comprises determining a bottom out-of-view shift,
wherein determining the bottom out-of-view shift comprises evaluating a bottom horizontal slice of the voxel density file to determine whether the number of pixels above the threshold iso-value exceeds a bottom out-of-view shift threshold.
9. The method of claim 8 , wherein the bottom out-of-view shift threshold is at least 8% up to 100%.
10. A system of automatically detecting an out-of-view Computed Tomography (CT) scan, comprising:
a processor;
a computer-readable storage medium comprising instructions executable by the processor to perform steps comprising:
receiving a voxel density file;
determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file; and
evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view,
wherein evaluating comprises determining a lateral out-of-view shift,
wherein determining a lateral out-of-view shift comprises determining a horizontal slice comprising a longest continuous arc of intersection between a view cylinder boundary and voxels above the threshold iso-value of density is above a lateral out-of-view shift threshold.
11. The system of claim 10 , wherein evaluating comprises determining a lateral out-of-view shift.
12. The system of claim 10 , wherein evaluating comprises determining a vertical out-of-view shift.
13. A non-transitory computer readable medium storing executable computer program instructions for automatically detecting an out-of-view Computed Tomography (CT) scan, the computer program instructions comprising instructions for:
receiving a voxel density file;
determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file; and
evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view,
wherein evaluating comprises determining a lateral out-of-view shift,
wherein determining a lateral out-of-view shift comprises determining a horizontal slice comprising a longest continuous arc of intersection between a view cylinder boundary and voxels above the threshold iso-value of density is above a lateral out-of-view shift threshold.
14. The medium of claim 13 , wherein evaluating comprises determining a lateral out-of-view shift.
15. The medium of claim 13 , wherein evaluating comprises determining a vertical out-of-view shift.