FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1986266093> ?p ?o ?g. }

• W1986266093 abstract "Teleradiotherapy imposes the requirement of high accuracy in reference to its medical as well as technical aspects. Close adherence to the geometrical parameters set up in therapy planning is vital. The current location of the irradiation field and anatomical structures can be recorded in the portal image acquired during the therapy course. Assessment of the treatment accuracy consists in registration (overlaying) of the reference and the portal image to compare the layout of anatomical structures and the irradiation field. Edges of the compared features are difficult to find in the portal image, which is inherently of low contrast. Hence, not all the edges present in the reference image can be found in the portal one, and the comparison of geometries in these images is difficult and time-consuming. There exists a need for a tool that could support and objectify this process. At present the accuracy assessment is done manually by an experienced observer. As a rule, this tedious procedure is not performed routinely. The wide literature on image registration refers to portal images made with beams generated in accelerators rather than with the cobalt apparata. In Poland more than a half of patients are treated with cobalt. There are numerous references to image registration methods tailored for finding the fitting and non-fitting fragments of the compared edges. The majority of these methods lack generality. The methodology to be presented is general and requires little user intervention. • Features to be matched: edges of selected anatomical structures, irradiation field and shields, as seen in scanned images. • Edge detector: zero-second-derivative with scale fitted to noise and scale of edges, separately in portal and reference images. • Geometrical transformation: affine (2 translations, rotation, 2 scalings – along two coordinate axes). • Measure of fitting accuracy: modified Hausdorff distance measure – robust method based on voting. Parts of the contours that do not fit the general tendency are rejected. This is vital if portal images made with cobalt apparata are analysed. • Optimisation method for finding the best transformation: maximum gradient (chamfer matching) . • Final fit can be calculated with le least squares method for only those pixels which were classified as fitting. • Speed-ups: hierarchical method (pyramid of resolutions); in some cases: pre-calculated virtual transformations. • Automatic classification of edges as belonging to anatomic structures, irradiation field or shields is possible. • Experiments with enhancing the contrast of portal images using the optical system transfer function concept. The software tool will be presented which makes it possible to correct the therapeutic system geometry or the location of the patient. Full control of the physician over the measurement process will be maintained, according to the requirement of human decision-making in the therapeutical process. The registration (overlaying) of a portal and a reference image is visualised for verification. Manual corrections of the result will be possible in the final version of the program. Acknowledgement The work is supported by the Committee for Scientific Research within the grant no. KBN 4 P05B 064 18." @default.
• W1986266093 created "2016-06-24" @default.
• W1986266093 creator A5026255453 @default.
• W1986266093 creator A5037775330 @default.
• W1986266093 creator A5069456823 @default.
• W1986266093 creator A5082395674 @default.
• W1986266093 date "2001-01-01" @default.
• W1986266093 modified "2023-10-18" @default.
• W1986266093 title "25. Assessment of the accuracy of radiotherapy by digital superposition of portal and rference images" @default.
• W1986266093 doi "https://doi.org/10.1016/s1507-1367(01)70395-1" @default.
• W1986266093 hasPublicationYear "2001" @default.
• W1986266093 type Work @default.
• W1986266093 sameAs 1986266093 @default.
• W1986266093 citedByCount "0" @default.
• W1986266093 crossrefType "journal-article" @default.
• W1986266093 hasAuthorship W1986266093A5026255453 @default.
• W1986266093 hasAuthorship W1986266093A5037775330 @default.
• W1986266093 hasAuthorship W1986266093A5069456823 @default.
• W1986266093 hasAuthorship W1986266093A5082395674 @default.
• W1986266093 hasConcept C115961682 @default.
• W1986266093 hasConcept C126838900 @default.
• W1986266093 hasConcept C136085584 @default.
• W1986266093 hasConcept C154945302 @default.
• W1986266093 hasConcept C166704113 @default.
• W1986266093 hasConcept C177264268 @default.
• W1986266093 hasConcept C199360897 @default.
• W1986266093 hasConcept C201645570 @default.
• W1986266093 hasConcept C202444582 @default.
• W1986266093 hasConcept C31972630 @default.
• W1986266093 hasConcept C33923547 @default.
• W1986266093 hasConcept C41008148 @default.
• W1986266093 hasConcept C509974204 @default.
• W1986266093 hasConcept C71924100 @default.
• W1986266093 hasConcept C9652623 @default.
• W1986266093 hasConceptScore W1986266093C115961682 @default.
• W1986266093 hasConceptScore W1986266093C126838900 @default.
• W1986266093 hasConceptScore W1986266093C136085584 @default.
• W1986266093 hasConceptScore W1986266093C154945302 @default.
• W1986266093 hasConceptScore W1986266093C166704113 @default.
• W1986266093 hasConceptScore W1986266093C177264268 @default.
• W1986266093 hasConceptScore W1986266093C199360897 @default.
• W1986266093 hasConceptScore W1986266093C201645570 @default.
• W1986266093 hasConceptScore W1986266093C202444582 @default.
• W1986266093 hasConceptScore W1986266093C31972630 @default.
• W1986266093 hasConceptScore W1986266093C33923547 @default.
• W1986266093 hasConceptScore W1986266093C41008148 @default.
• W1986266093 hasConceptScore W1986266093C509974204 @default.
• W1986266093 hasConceptScore W1986266093C71924100 @default.
• W1986266093 hasConceptScore W1986266093C9652623 @default.
• W1986266093 hasLocation W19862660931 @default.
• W1986266093 hasOpenAccess W1986266093 @default.
• W1986266093 hasPrimaryLocation W19862660931 @default.
• W1986266093 hasRelatedWork W1487431771 @default.
• W1986266093 hasRelatedWork W1517635539 @default.
• W1986266093 hasRelatedWork W1595535584 @default.
• W1986266093 hasRelatedWork W1983939259 @default.
• W1986266093 hasRelatedWork W2013508161 @default.
• W1986266093 hasRelatedWork W2028061189 @default.
• W1986266093 hasRelatedWork W2060355101 @default.
• W1986266093 hasRelatedWork W2065406597 @default.
• W1986266093 hasRelatedWork W2130645939 @default.
• W1986266093 hasRelatedWork W2184777417 @default.
• W1986266093 hasRelatedWork W2189662664 @default.
• W1986266093 hasRelatedWork W2384694715 @default.
• W1986266093 hasRelatedWork W2551648765 @default.
• W1986266093 hasRelatedWork W2890378410 @default.
• W1986266093 hasRelatedWork W2921164945 @default.
• W1986266093 hasRelatedWork W342930847 @default.
• W1986266093 hasRelatedWork W73923811 @default.
• W1986266093 hasRelatedWork W2183795413 @default.
• W1986266093 hasRelatedWork W2350346648 @default.
• W1986266093 hasRelatedWork W2775579067 @default.
• W1986266093 isParatext "false" @default.
• W1986266093 isRetracted "false" @default.
• W1986266093 magId "1986266093" @default.
• W1986266093 workType "article" @default.