Method for automatically setting up computed tomography scan parameters
Systems, methods, apparatuses, and computer program products for nonintrusive scanning of objects using x-ray electromagnetic radiation. One method may include adjusting, by a computed tomography scanning device, at least one operation parameter including a grey value threshold based upon a material composition of a scan target; and collecting, by the computed tomography scanning device, at least one x-ray frame of the scan target based upon the at least one adjusted operation parameter.
1 . A method, comprising:
adjusting, by a computed tomography scanning device, at least one operation parameter comprising a grey value threshold based upon a material composition of a scan target; and
collecting, by the computed tomography scanning device, at least one x-ray frame of the scan target based upon the at least one adjusted operation parameter.
2 . The method of claim 1 , further comprising:
setting, by the computed tomography scanning device, at least one of a source beam energy parameter to a predefined maximum value.
3 . The method of claim 2 , wherein the predefined maximum value comprises a maximum beam energy achievable by the computed tomography scanning device.
4 . The method of claim 1 , further comprising:
setting, by the computed tomography scanning device, a camera gain parameter to a high value based upon a predetermined threshold value.
5 . The method of claim 4 , wherein the camera gain parameter is associated with amplification.
6 . The method of claim 1 , further comprising:
positioning and magnifying, by the computed tomography scanning device, an image of the scan target according to an object detection algorithm.
7 . The method of claim 1 , further comprising:
determining, by the computed tomography scanning device, the material composition of the scan target comprising determining whether the scan target is mono-material or multi-material.
8 . The method of claim 1 , further comprising:
determining, by the computed tomography scanning device, whether a minimum effective grey value associated with an image of the scan target is greater than the grey value threshold.
9 . The method of claim 1 , further comprising:
upon determining that a filtration parameter is set to a maximum filtration value, or that a minimum effective grey value is greater than the grey value threshold, determining, by the computed tomography scanning device, whether a focal spot is static or dynamic.
10 . The method of claim 1 , further comprising:
calculating, by the computed tomography scanning device, a source beam current parameter until
Focal
spot
size
≤
Pixel
size
Magnification
-
1
is satisfied.
11 . The method of claim 1 , further comprising:
calculating, by the computed tomography scanning device, an exposure duration per frame based on at least one of a total number of frames and a total time elapsed while collecting the frames.
12 . The method of claim 11 , further comprising:
determining, by the computed tomography scanning device, whether the exposure duration per frame is greater than a maximum exposure duration per frame threshold.
13 . The method of claim 12 , further comprising:
in response to determining that the exposure duration per frame is not greater than the maximum exposure duration per frame threshold, determining, by the computed tomography scanning device, whether the exposure duration per frame is less than a minimum exposure limit threshold.
14 . The method of claim 12 , further comprising:
in response to determining that the exposure duration per frame is greater than the maximum exposure duration per frame threshold,
setting, by the computed tomography scanning device, the exposure duration per frame to an upper limit of the computed tomography scanning device, and
calculating the total number of frames based on at least the exposure duration per frame and a total scan duration.
15 . The method of claim 1 , further comprising:
determining, by the computed tomography scanning device, whether a total number of projections is less than a maximum total number of projections threshold.
16 . The method of claim 15 , further comprising:
in response to determining that the total number of projections is less than the maximum total number of projections threshold, calculating, by the computed tomography scanning device, any of a noise optimal distribution of scan projections, bright flat-field correction projections, and dark flat-field correction projections based on the total number of projections.
17 . A system comprising:
a data processing apparatus including at least one processor; and
a non-transitory computer-readable medium encoding instructions configured to cause the data processing apparatus to perform operations comprising:
setting at least one scan parameter comprising a source beam energy parameter of a computed tomography scanning device to a predefined maximum value; and
scanning a scan target according to the at least one scan parameter;
wherein the at least one scan parameter comprises a source beam current parameter, and the predefined maximum value comprises a predefined source beam current maximum value achievable by the computed tomography scanning device, and
wherein the operations further comprise:
determining that a filtration parameter is set to a maximum filtration value or determining that a minimum effective grey value is greater than a grey value threshold;
in response to determining that the filtration parameter is set to the maximum filtration value or determining that the minimum effective grey value is greater than the grey value threshold, determining that a focal spot of the computed tomography scanning device is dynamic; and
in response to determining that the focal spot of the computed tomography scanning device is dynamic, source beam decreasing the current parameter until
Focal
spot
size
≤
Pixel
size
M
a
g
n
i
f
i
c
a
t
i
o
n
-
1
is satisfied.
18 . The system of claim 17 , wherein the predefined maximum value comprises a maximum beam energy achievable by the computed tomography scanning device.
19 . The system of claim 17 , wherein the operations comprise:
adjusting a grey value threshold based upon a material composition of the scan target.
20 . A non-transitory computer-readable medium encoding instructions operable to cause a data processing apparatus to perform operations comprising:
obtaining a total number of projections;
calculating a noise optimal distribution of scan projections and flat-field correction projections based on the total number of projections, wherein the noise optimal distribution is calculated for reduced noise; and
obtaining, using a computed tomography scanning device, at least one x-ray frame of a scan target based upon the distribution of the scan projections and the flat-field correction projections.
21 . The computer-readable medium of claim 20 , wherein the flat-field correction projections comprise at least one of bright flat-field correction projections and dark flat-field correction projections.
22 . The computer-readable medium of claim 21 , wherein calculating the noise optimal distribution comprises determining a number of scan projections, a number bright flat-field correction projections, and a number of dark flat-field correction projections for minimized reconstruction noise.
23 . The computer-readable medium of claim 20 , wherein the operations comprise:
determining whether the total number of projections is less than a maximum total number of projections threshold; and
in response to determining that the total number of projections is less than the maximum total number of projections threshold, calculating the noise optimal distribution.
24 . The computer-readable medium of claim 23 , wherein the operations comprise:
obtaining a second total number of projections;
in response to determining that the second total number of projections is not less than the maximum total number of projections threshold, adjusting a number of frames per projection;
resetting the second total number of projections to an initial value; and
calculating an exposure duration per frame.