{"id":382592,"date":"2024-09-13T10:10:55","date_gmt":"2024-09-13T10:10:55","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/breast-deformation-under-gravity-prone-to-supine-position\/"},"modified":"2024-09-13T10:12:50","modified_gmt":"2024-09-13T10:12:50","slug":"breast-deformation-under-gravity-prone-to-supine-position","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/breast-deformation-under-gravity-prone-to-supine-position\/","title":{"rendered":"Breast deformation under gravity (prone to supine position)"},"content":{"rendered":"

<p><p><span lang=”EN-US”>Hi, I am currently working on simulating breast deformation from the prone to supine position, but I’ve encountered issues where my results differ from the paper by Lianghao Han et al. (2014)(<span style=”font-size: 14pt; font-family: ‘Times New Roman’; color: black;”>A Nonlinear Biomechanical Model Based Registration Method for Aligning Prone and Supine MR Breast Images<\/span><\/em>). I’d like to understand if there’s anything in my setup that needs adjustment.<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>-<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Here’s the setup of my simple model:<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”><\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Green: Chest wall<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Yellow: Pectoral muscle<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Gray: Skin<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Blue: Fat<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Light green (inside): Gland<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>For materials, I’m using the Mooney-Rivlin model, which was validated in a previous study with no issues in the parameter settings.<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>-<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Contact settings:<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Skin\/chest wall: Frictionless<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Skin\/pectoral muscle: No separation<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Pectoral muscle\/chest wall: Frictionless<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>The mesh size is 3 mm. I’ve tried smaller meshes, but the results don’t seem to differ. To simulate gravity’s effect on deformation, I set the acceleration to 20000 mm\/s², as the paper suggests that transitioning from prone to supine requires double the gravitational force (prone > unload > supine). I’ve accounted for the direction change, but the results still seem unrealistic, with the breast approaching the sternum.<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”><\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>-<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Boundary conditions:<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>1. Fixed on the chest wall’s six faces<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>2. Set at the edge of the breast near the sternum<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>In my simulation, the maximum deformation is only 22 mm (below 1), while the paper shows deformation reaching 60 mm (below 2). Additionally, the location of the maximum deformation in my model occurs at the anterior end, whereas the paper’s results show it near the shoulder. I’m puzzled by these differences and would appreciate any suggestions on how to improve the setup to align more closely with the paper’s results.<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”><\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”><\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>-<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US”>Thank you for taking the time to read this. Since I’m still new to ANSYS, any feedback is greatly appreciated.<\/span><\/p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-382592","topic","type-topic","status-publish","hentry","topic-tag-gravity-acceleration-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["453796","99"],"_bbp_author_ip":["140.114.122.242"],"_btv_view_count":["463"],"_bbp_topic_status":["unanswered"],"_edit_last":["453796"],"_bbp_revision_log":["a:1:{i:382593;a:2:{s:6:\"author\";i:453796;s:6:\"reason\";s:0:\"\";}}"],"_edit_lock":["1726248485:180"],"_bbp_topic_id":["382592"],"_bbp_forum_id":["27791"],"_bbp_engagement":["99","453796"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["383368"],"_bbp_last_active_id":["383368"],"_bbp_last_active_time":["2024-09-20 18:24:19"]},"test":"s113010505sgapp-nthu-edu-tw"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/382592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/382592\/revisions"}],"predecessor-version":[{"id":382593,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/382592\/revisions\/382593"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=382592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}