{"id":2145,"date":"2026-01-29T19:38:40","date_gmt":"2026-01-29T11:38:40","guid":{"rendered":"https:\/\/sites.gtiit.edu.cn\/cligroup\/?page_id=2145"},"modified":"2026-02-08T22:34:26","modified_gmt":"2026-02-08T14:34:26","slug":"44-2","status":"publish","type":"page","link":"https:\/\/sites.gtiit.edu.cn\/cligroup\/44-2\/","title":{"rendered":"Spatiotemporal Stitching of 4D CT data"},"content":{"rendered":"\t\t
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<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Background<\/strong><\/h3>

Four-dimensional computed tomography (4D-CT) holds promise in enhancing the comprehensiveness of pulmonary scans but is often limited by the scanning capacity. Conventional 4D-CT scans cover only 16 cm along the axial direction z-axis with 320 slices, insufficient to capture the entire lung in a single session. This study aims to construct a complete “full-lung” volume by synthesizing scans from different segments of the lung at matching respiratory phases, with an emphasis on matching vascular structures and other critical anatomical features.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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4D-CT imaging stitching<\/b><\/h3>

The upper and lower sections of the lung were scanned separately during controlled breathing cycles. The scans were synchronized temporally and spatially using approaches based on the image cross-correlation algorithm, deformation of the lungs, and sternum displacement, allowing for the accurate stitching of voxel data from identical respiratory phases.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\"\u5fae\u4fe1\u622a\u56fe_20260206170058\"<\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Fig. 1. Stitching algorithm and validation map.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\"\u5fae\u4fe1\u622a\u56fe_20260206174220\"<\/figure><\/div>
\"\u5fae\u4fe1\u622a\u56fe_20260206175607\"<\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\"\u5fae\u4fe1\u622a\u56fe_20260206174038\"<\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Fig. 2. Stitching methods, including time scale normalized cross-correlation analysis, time scale structural similarity analysis, sternum motion curve, deformation curve of upper and lower lung area\/volume.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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4D-CT stitching\u00a0<\/b>validation<\/b><\/h3>

The\u00a0<\/span>correlation value and\u00a0comparison of the <\/span>cross-sectional area<\/span> of small <\/span>pulmonary vessels<\/span> between the stitched <\/span>4D-CT<\/span> and 3D-CT breath-hold image.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\"\u5fae\u4fe1\u622a\u56fe_20260208223245\"<\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Fig. 3. Comparison of the coronal and sagittal planes between the stitched 4D-CT and 3D-CT, with the normalized cross-correlation values.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\"\u5fae\u4fe1\u622a\u56fe_20260206200310\"<\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Fig. 4. Pulmonary vascular reconstruction and\u00a0segmenting arteries and veins.<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Background Four-dimensional computed tom… Read More<\/a><\/p>\n","protected":false},"author":326,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":[],"_links":{"self":[{"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/pages\/2145"}],"collection":[{"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/users\/326"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/comments?post=2145"}],"version-history":[{"count":3,"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/pages\/2145\/revisions"}],"predecessor-version":[{"id":2507,"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/pages\/2145\/revisions\/2507"}],"wp:attachment":[{"href":"https:\/\/sites.gtiit.edu.cn\/cligroup\/wp-json\/wp\/v2\/media?parent=2145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}