{"id":542,"date":"2014-10-03T10:59:02","date_gmt":"2014-10-03T13:59:02","guid":{"rendered":"http:\/\/hemolab.lncc.br\/web\/?p=542"},"modified":"2017-05-23T15:53:13","modified_gmt":"2017-05-23T18:53:13","slug":"tutorials-segmenting-images-and-posterior-fem-generation-2","status":"publish","type":"post","link":"http:\/\/hemolab.lncc.br\/?p=542","title":{"rendered":"TUTORIALS > SEGMENTING IMAGES AND POSTERIOR FEM GENERATION"},"content":{"rendered":"

1 –\u00a0Open the IVUS examination.<\/p>\n

2 – To facilitate the visualization the user can double-click on the Axial yield that will be expanded and the other renders will be collected in this case, your screen will look like below.<\/p>\n

\"\"<\/p>\n

3 – Click\u00a0Image Filters<\/em>\u00a0menu, scroll to select the filter\u00a0Segmentation<\/em>\u00a0and\u00a0Active Contours.<\/em><\/p>\n

\"\"<\/p>\n

4 – This will open the filter and its interface\u00a0widgets (snakes)<\/em>\u00a0as shown in the image below.<\/p>\n

\"\"<\/p>\n

Note that the active\u00a0widget<\/em>\u00a0is shown in light blue and red inactive, to switch between them using the option\u00a0Active Snake<\/em>\u00a0interface,\u00a0only<\/strong>\u00a0the\u00a0widget<\/em>\u00a0can be active moves of the\u00a0surrender.<\/em>\u00a0Hesitate to use only one option for this\u00a0widget<\/em>\u00a0uncheck\u00a0Dual snakes.<\/em><\/p>\n

\"\"<\/p>\n

At the opening of the test program automatically places the display on the medium frame for example, if the examination has 100 frames the program will position the display on the frame 50.The same goes for the\u00a0widgets<\/em>\u00a0if they are not visible simply navigate between frames so that they appear.<\/p>\n

The interface parameters are then independent counsel for each\u00a0widget<\/em>\u00a0must be set for each\u00a0one.<\/em>The setting takes effect only made for the active\u00a0widget.<\/em><\/p>\n

Place the widgets as close to the edges as desired mostrad in the image below.<\/p>\n

\"\"<\/p>\n

Configuration parameters:<\/strong><\/p>\n

Snake options<\/em><\/strong>\u00a0– define what force will be used for processing (or\u00a0Gradient Threshold)\u00a0<\/em>\u00a0and the percentage of decline in the current frame generated\u00a0snake.\u00a0<\/em>\u00a0This\u00a0snake<\/em>\u00a0retreated, or decreased, will be used for initial processing of the next frame.<\/p>\n

\"\"<\/p>\n

Ranges<\/em><\/strong>\u00a0– ranges defines frames for processing.\u00a0If the third parameter\u00a0(Final)<\/em>\u00a0-1 is the processing will take place starting from the frame indicated by the first parameter\u00a0(Initial)<\/em>\u00a0until the frame indicated in the second parameter\u00a0(Middle).<\/em>\u00a0In this case, the frame 1 to 21.<\/p>\n

\"\"<\/p>\n

In the case of the parameter to be configured\u00a0Final<\/em>\u00a0processing will occur in two directions, starting from frame set in toward the\u00a0Middle Initial<\/em>\u00a0and toward the\u00a0Middle Final.<\/em>\u00a0The intervals can not overlap.<\/p>\n

The following image parameters are very sensitive to processed and taken to the contour that you want to extract (internal or external).<\/p>\n

Number of points<\/em><\/strong>\u00a0– number of points of the\u00a0widget (snake)<\/em>
\nInitial radius curve<\/em><\/strong>\u00a0– initial radius of the\u00a0widget (snake)<\/em>
\nSnake center [X]<\/em><\/strong>\u00a0– initial center of the\u00a0widget (snake)<\/em>\u00a0in relation to the X axis
\nSnake center [Y]<\/em><\/strong>\u00a0– initial center of the\u00a0widget (snake)<\/em>\u00a0in relation to the Y axis
\nConstant image<\/em><\/strong>\u00a0– the image intensity strength (gradient)
\nNormal constant<\/em><\/strong>\u00a0– the normal force intensity
\nUse elastic force<\/em><\/strong>\u00a0– controls whether the elastic force will be used
\nMedian size<\/em><\/strong>\u00a0– width of the convolution mask used by the median filter
\nMinimum threshold<\/em><\/strong>\u00a0– minimum\u00a0threshold<\/em>\u00a0image used
\nMaximum threshold<\/em><\/strong>\u00a0– maximum\u00a0threshold<\/em>\u00a0image used
\nFreeze Limit<\/em><\/strong>\u00a0– During processameto the\u00a0snake<\/em>\u00a0points are moved, this parameter defines from how many times in the same place the point will be considered frozen.
\nFreeze Distance<\/em><\/strong>\u00a0– Minimum distance between the current position of a point and its previous position.
\nElastic force<\/em><\/strong>\u00a0– elastic intensity between two points.<\/p>\n

\"\"<\/p>\n

The parameters concerning the image below to see the results processed.<\/p>\n

\"\"<\/p>\n

The user can enable \/ disable the display of snakes internal and external (where applicable), your area, the gradient map used in processing, if any, and the size of its points, generating a display similar to below.<\/p>\n

\"\"<\/p>\n

It may be noted that the snake in the 3D\u00a0rendering<\/em>\u00a0is also displayed.<\/p>\n

In this image we have the result of segmentation of the inner and outer.<\/p>\n

\"\"<\/p>\n

The user can save the snakes on a mesh generated has vtk file format that can be read by HeMoLab.<\/p>\n

\"\"<\/p>\n

If necessary the reprocessing of the filter, you can restart it and your\u00a0widgets<\/em>\u00a0with the\u00a0default settings<\/em>by\u00a0reset<\/em>\u00a0button shown in the image above.
\nBelow is the image of the files in vtk format for the inner and outer layers opened by HeMoLab.<\/p>\n

\"\"<\/p>\n

\"\"<\/a><\/div>\n
<\/div>\n

\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

1 –\u00a0Open the IVUS examination. 2 – To facilitate the visualization the user can double-click on the Axial yield that will be expanded and the other renders will be collected in this case, your screen will look like below. 3 – Click\u00a0Image Filters\u00a0menu, scroll to select the filter\u00a0Segmentation\u00a0and\u00a0Active Contours. 4 – This will open the […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[9],"tags":[],"_links":{"self":[{"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=\/wp\/v2\/posts\/542"}],"collection":[{"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=542"}],"version-history":[{"count":5,"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=\/wp\/v2\/posts\/542\/revisions"}],"predecessor-version":[{"id":1281,"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=\/wp\/v2\/posts\/542\/revisions\/1281"}],"wp:attachment":[{"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=542"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=542"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/hemolab.lncc.br\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=542"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}