Medical imaging system, medical image processing apparatus, and computer-readable medium
First Claim
Patent Images
1. A medical imaging system, comprising:
- an image generating unit which captures a front chest image of a subject and generates a front chest medical image which is a still image;
a region extracting unit which extracts a lung field region from the front chest medical image, divides the lung field region into a plurality of small regions, extracts high spatial frequency components with a high-pass filter for each of the plurality of small regions of the lung field region, calculates a maximum value or an integral value of response of the extracted high spatial frequency components in a range between Nyquist frequency fN and (fN−
Δ
f), wherein Δ
f represents a predetermined value, compares either the calculated maximum value or the calculated integral value to a threshold value predetermined for the maximum value or to a threshold value predetermined for the integral value, and extracts, from the plurality of small regions, small regions having the threshold value or smaller as a plurality of local regions which include no edge of a rib bone;
a motion judging unit which extracts high spatial frequency components from each of the plurality of local regions extracted by the region extracting unit, calculates a motion feature value based on the extracted high spatial frequency components of the extracted plurality of local regions, and judges whether there is any motion in the subject during image capture based on the calculated motion feature value; and
a controlling unit which causes an outputting unit to output a judgment result made by the motion judging unit.
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Abstract
A medical imaging system includes: an image generating unit which captures an image of a subject and generates a medical image which is a still image; a region extracting unit which extracts a subject region from the medical image and extracts a local region which includes no edge from the subject region; a motion judging unit which extracts high spatial frequency components from the local region extracted by the region extracting unit and judges whether there is any motion in the subject during image capture based on the extracted high spatial frequency components; and a controlling unit which causes an outputting unit to output a judgment result made by the motion judging unit.
23 Citations
9 Claims
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1. A medical imaging system, comprising:
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an image generating unit which captures a front chest image of a subject and generates a front chest medical image which is a still image; a region extracting unit which extracts a lung field region from the front chest medical image, divides the lung field region into a plurality of small regions, extracts high spatial frequency components with a high-pass filter for each of the plurality of small regions of the lung field region, calculates a maximum value or an integral value of response of the extracted high spatial frequency components in a range between Nyquist frequency fN and (fN−
Δ
f), wherein Δ
f represents a predetermined value, compares either the calculated maximum value or the calculated integral value to a threshold value predetermined for the maximum value or to a threshold value predetermined for the integral value, and extracts, from the plurality of small regions, small regions having the threshold value or smaller as a plurality of local regions which include no edge of a rib bone;a motion judging unit which extracts high spatial frequency components from each of the plurality of local regions extracted by the region extracting unit, calculates a motion feature value based on the extracted high spatial frequency components of the extracted plurality of local regions, and judges whether there is any motion in the subject during image capture based on the calculated motion feature value; and a controlling unit which causes an outputting unit to output a judgment result made by the motion judging unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical image processing apparatus comprising:
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a computer processor comprising; a region extracting unit structured to extract a lung field region from a front chest medical image which is a still image obtained by imaging a subject, to divide the lung field region into a plurality of small regions, to extract high spatial frequency components with a high-pass filter for each of the plurality of small regions of the lung field region, to calculate a maximum value or an integral value of response of the extracted high spatial frequency components in a range between Nyquist frequency fN and (fN−
Δ
f), wherein Δ
f represents a predetermined value, to compare either the calculated maximum value or the calculated integral value to a threshold value predetermined for the maximum value or to a threshold value predetermined for the integral value, and to extract, from the plurality of small regions, small regions having the threshold value or smaller as a plurality of local regions which include no edge of a rib bone;a motion judging unit structured to extract high spatial frequency components from the plurality of local regions extracted by the region extracting unit, to calculate a motion feature value based on the extracted high spatial frequency components of the extracted plurality of local regions, and to judge whether there is motion in the subject during image capture based on the calculated motion feature value; and a controlling unit structured to cause an outputting unit to output a judgment result made by the motion judging unit.
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9. A non-transitory computer-readable medium including computer readable instructions that, when executed by a computer, cause the computer to perform:
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extracting a lung field region from a front chest medical image which is a still image obtained by imaging a subject, dividing the lung field region into a plurality of small regions, extracting high spatial frequency components with a high-pass filter for each of the plurality of small regions of the lung field region, calculating a maximum value or an integral value of response of the extracted high spatial frequency components in a range between Nyquist frequency fN and (fN−
Δ
f), wherein Δ
f represents a predetermined value, comparing either the calculated maximum value or the calculated integral value to a threshold value predetermined for the maximum value or to a threshold value predetermined for the integral value, and extracting, from the plurality of small regions, small regions having the threshold value or smaller as a plurality of local regions which include no edge of a rib bone;extracting high spatial frequency components from the plurality of local regions, calculating a motion feature value based on the extracted high spatial frequency components of the extracted plurality of local regions, and judging whether there is motion in the subject during image capture based on the calculated motion feature value; and outputting a judgment result made by judging whether there is a motion in the subject.
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Specification