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Article: Intra and Interfraction Mediastinal Nodal Region Motion: Implications for Internal Target Volume Expansions

TitleIntra and Interfraction Mediastinal Nodal Region Motion: Implications for Internal Target Volume Expansions
Authors
KeywordsInterfraction motion
Lung cancer
Intrafraction motion
Mediastinal lymph node
Issue Date2009
Citation
Medical Dosimetry, 2009, v. 34, n. 2, p. 133-139 How to Cite?
AbstractThe purpose of this study was to determine the intra and interfraction motion of mediastinal lymph node regions. Ten patients with nonsmall-cell lung cancer underwent controlled inhale and exhale computed tomography (CT) scans during two sessions (40 total datasets) and mediastinal nodal stations 1-8 were outlined. Corresponding CT scans from different sessions were registered to remove setup error and, in this reference frame, the centroid of each nodal station was compared for right-left (RL), anterior-posterior (AP), and superior-inferior (SI) displacement. In addition, an anisotropic volume expansion encompassing the change of the nodal region margins in all directions was used. Intrafraction displacement was determined by comparing same session inhale-exhale scans. Interfraction reproducibility of nodal regions was determined by comparing the same respiratory phase scans between two sessions. Intrafraction displacement of centroid varied between nodal stations. All nodal regions moved posteriorly and superiorly with exhalation, and inferior nodal stations showed the most motion. Based on anisotropic expansion, nodal regions expanded mostly in the RL direction from inhale to exhale. The interpatient variations in intrafraction displacement were large compared with the displacements themselves. Moreover, there was substantial interfractional displacement (∼5 mm). Mediastinal lymph node regions clearly move during breathing. In addition, deformation of nodal regions between inhale and exhale occurs. The degree of motion and deformation varies by station and by individual. This study indicates the potential advantage of characterizing individualized nodal region motion to safely maximize conformality of mediastinal nodal targets.
Persistent Identifierhttp://hdl.handle.net/10722/266896
ISSN
2023 Impact Factor: 1.1
2023 SCImago Journal Rankings: 0.425
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorThomas, Jonathan G.-
dc.contributor.authorKashani, Rojano-
dc.contributor.authorBalter, James M.-
dc.contributor.authorTatro, Daniel-
dc.contributor.authorKong, Feng Ming-
dc.contributor.authorPan, Charlie C.-
dc.date.accessioned2019-01-31T07:19:55Z-
dc.date.available2019-01-31T07:19:55Z-
dc.date.issued2009-
dc.identifier.citationMedical Dosimetry, 2009, v. 34, n. 2, p. 133-139-
dc.identifier.issn0958-3947-
dc.identifier.urihttp://hdl.handle.net/10722/266896-
dc.description.abstractThe purpose of this study was to determine the intra and interfraction motion of mediastinal lymph node regions. Ten patients with nonsmall-cell lung cancer underwent controlled inhale and exhale computed tomography (CT) scans during two sessions (40 total datasets) and mediastinal nodal stations 1-8 were outlined. Corresponding CT scans from different sessions were registered to remove setup error and, in this reference frame, the centroid of each nodal station was compared for right-left (RL), anterior-posterior (AP), and superior-inferior (SI) displacement. In addition, an anisotropic volume expansion encompassing the change of the nodal region margins in all directions was used. Intrafraction displacement was determined by comparing same session inhale-exhale scans. Interfraction reproducibility of nodal regions was determined by comparing the same respiratory phase scans between two sessions. Intrafraction displacement of centroid varied between nodal stations. All nodal regions moved posteriorly and superiorly with exhalation, and inferior nodal stations showed the most motion. Based on anisotropic expansion, nodal regions expanded mostly in the RL direction from inhale to exhale. The interpatient variations in intrafraction displacement were large compared with the displacements themselves. Moreover, there was substantial interfractional displacement (∼5 mm). Mediastinal lymph node regions clearly move during breathing. In addition, deformation of nodal regions between inhale and exhale occurs. The degree of motion and deformation varies by station and by individual. This study indicates the potential advantage of characterizing individualized nodal region motion to safely maximize conformality of mediastinal nodal targets.-
dc.languageeng-
dc.relation.ispartofMedical Dosimetry-
dc.subjectInterfraction motion-
dc.subjectLung cancer-
dc.subjectIntrafraction motion-
dc.subjectMediastinal lymph node-
dc.titleIntra and Interfraction Mediastinal Nodal Region Motion: Implications for Internal Target Volume Expansions-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.meddos.2008.07.003-
dc.identifier.pmid19410142-
dc.identifier.scopuseid_2-s2.0-65349106774-
dc.identifier.volume34-
dc.identifier.issue2-
dc.identifier.spage133-
dc.identifier.epage139-
dc.identifier.isiWOS:000266195300006-
dc.identifier.issnl1873-4022-

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