Pub Date : 2019-09-01Epub Date: 2019-03-15DOI: 10.1007/s13246-019-00748-3
Dae Woo Park, Hyun-Chong Cho
Shear wave elasticity imaging (SWEI) has been used to measure the local tissue elasticity. The local tissue shear modulus can be reconstructed from the displacement field of shear waves using an algebraic Helmholtz inversion (AHI) equation or a time-of-flight (TOF)-based algorithm. The shear waves, which are generated by successive focusing of ultrasonic beams at different depths, propagate at oblique angles rather than along the lateral position. The wave propagation at oblique angles can result in bias in shear modulus reconstruction using the AHI equation or the TOF-based algorithm. In this study, the effect of wave propagation at oblique angles on the tissue shear modulus reconstruction was investigated using in silico finite element (FE) simulation. An FE elastic tissue with a hard inclusion model was designed. The shear waves with propagation angles of 0°, 5°, and 10° were applied to the model. The shear modulus and the percentage error in the model were computed using the AHI equation and the TOF-based algorithm at each propagation angle from 0° to 10°. For the AHI equation, the percentage error was 0% at propagation angles of 0° and 5°, and 1% at a propagation angle of 10° in the inclusion. In the surrounding tissue, the percentage error was 0% at propagation angles of 0°, 5°, and 10°. For the TOF-based algorithm, the percentage error was 0% at propagation angles of 0° and 5°, and 40% at a propagation angle of 10° in the inclusion. In the surrounding tissue, the percentage error was 0% at propagation angles of 0° and 5°, and 35% at a propagation angle of 10° in the inclusion. Therefore, whereas the TOF-based algorithm produced critical bias in shear modulus reconstruction by the shear wave propagation at oblique angles, the AHI equation was not affected by the propagation.
{"title":"Ultrasound shear wave simulation of wave propagation at oblique angles.","authors":"Dae Woo Park, Hyun-Chong Cho","doi":"10.1007/s13246-019-00748-3","DOIUrl":"https://doi.org/10.1007/s13246-019-00748-3","url":null,"abstract":"<p><p>Shear wave elasticity imaging (SWEI) has been used to measure the local tissue elasticity. The local tissue shear modulus can be reconstructed from the displacement field of shear waves using an algebraic Helmholtz inversion (AHI) equation or a time-of-flight (TOF)-based algorithm. The shear waves, which are generated by successive focusing of ultrasonic beams at different depths, propagate at oblique angles rather than along the lateral position. The wave propagation at oblique angles can result in bias in shear modulus reconstruction using the AHI equation or the TOF-based algorithm. In this study, the effect of wave propagation at oblique angles on the tissue shear modulus reconstruction was investigated using in silico finite element (FE) simulation. An FE elastic tissue with a hard inclusion model was designed. The shear waves with propagation angles of 0°, 5°, and 10° were applied to the model. The shear modulus and the percentage error in the model were computed using the AHI equation and the TOF-based algorithm at each propagation angle from 0° to 10°. For the AHI equation, the percentage error was 0% at propagation angles of 0° and 5°, and 1% at a propagation angle of 10° in the inclusion. In the surrounding tissue, the percentage error was 0% at propagation angles of 0°, 5°, and 10°. For the TOF-based algorithm, the percentage error was 0% at propagation angles of 0° and 5°, and 40% at a propagation angle of 10° in the inclusion. In the surrounding tissue, the percentage error was 0% at propagation angles of 0° and 5°, and 35% at a propagation angle of 10° in the inclusion. Therefore, whereas the TOF-based algorithm produced critical bias in shear modulus reconstruction by the shear wave propagation at oblique angles, the AHI equation was not affected by the propagation.</p>","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 3","pages":"665-670"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00748-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37061383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-30DOI: 10.1007/s13246-019-00793-y
K. Mebarkia, A. Reffad
{"title":"Multi optimized SVM classifiers for motor imagery left and right hand movement identification","authors":"K. Mebarkia, A. Reffad","doi":"10.1007/s13246-019-00793-y","DOIUrl":"https://doi.org/10.1007/s13246-019-00793-y","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"949 - 958"},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00793-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46275161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-26DOI: 10.1007/s13246-019-00790-1
Seyedeh Naghmeh Miri Ashtiani, H. Behnam, M. Daliri, G. Hossein-Zadeh, M. Mehrpour
{"title":"Analysis of brain functional connectivity network in MS patients constructed by modular structure of sparse weights from cognitive task-related fMRI","authors":"Seyedeh Naghmeh Miri Ashtiani, H. Behnam, M. Daliri, G. Hossein-Zadeh, M. Mehrpour","doi":"10.1007/s13246-019-00790-1","DOIUrl":"https://doi.org/10.1007/s13246-019-00790-1","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"921 - 938"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00790-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43034439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-26DOI: 10.1007/s13246-019-00789-8
O. Bawazeer, S. Herath, S. Sarasanandarajah, T. Kron, L. Dunn, P. Deb
{"title":"A simple and efficient method to measure beam attenuation through a radiotherapy treatment couch and immobilization devices","authors":"O. Bawazeer, S. Herath, S. Sarasanandarajah, T. Kron, L. Dunn, P. Deb","doi":"10.1007/s13246-019-00789-8","DOIUrl":"https://doi.org/10.1007/s13246-019-00789-8","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"1183 - 1189"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00789-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46487049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-26DOI: 10.1007/s13246-019-00788-9
A. Kanani, S. Karbasi, M. Mosleh-Shirazi
{"title":"Independent assessment of source transit time for the BEBIG SagiNova® cobalt-60 high dose rate brachytherapy afterloader","authors":"A. Kanani, S. Karbasi, M. Mosleh-Shirazi","doi":"10.1007/s13246-019-00788-9","DOIUrl":"https://doi.org/10.1007/s13246-019-00788-9","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"913 - 919"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00788-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44883761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-13DOI: 10.1007/s13246-019-00786-x
Jin-sol Shin, Hoon Choi, Hun-Joo Shin, Shin-Wook Kim, H. Park, Jina Kim, A. Kim, Jinho Hwang, Y. Seol, T. Oh, H. Jang, B. Choi, Y. Kang
{"title":"Verification of lithium formate monohydrate in 3D-printed container for electron paramagnetic resonance dosimetry in radiotherapy","authors":"Jin-sol Shin, Hoon Choi, Hun-Joo Shin, Shin-Wook Kim, H. Park, Jina Kim, A. Kim, Jinho Hwang, Y. Seol, T. Oh, H. Jang, B. Choi, Y. Kang","doi":"10.1007/s13246-019-00786-x","DOIUrl":"https://doi.org/10.1007/s13246-019-00786-x","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"811 - 818"},"PeriodicalIF":0.0,"publicationDate":"2019-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00786-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44760892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-08DOI: 10.1007/s13246-019-00785-y
A. Santos, J. Shepherd
{"title":"An affordable custom phantom for measurement of linac time delay in gated treatments with irregular breathing","authors":"A. Santos, J. Shepherd","doi":"10.1007/s13246-019-00785-y","DOIUrl":"https://doi.org/10.1007/s13246-019-00785-y","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"863 - 869"},"PeriodicalIF":0.0,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00785-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45101127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-08DOI: 10.1007/s13246-019-00784-z
H. Kawashima, K. Ichikawa, Shinsuke Hanaoka, K. Matsubara
{"title":"Optimizing image quality using automatic exposure control based on the signal-difference-to-noise ratio: a phantom study","authors":"H. Kawashima, K. Ichikawa, Shinsuke Hanaoka, K. Matsubara","doi":"10.1007/s13246-019-00784-z","DOIUrl":"https://doi.org/10.1007/s13246-019-00784-z","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"803 - 810"},"PeriodicalIF":0.0,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00784-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48947140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-01DOI: 10.1007/s13246-019-00783-0
Bo Sheng, Lihua Tang, O. Moosman, Chao Deng, S. Xie, Yanxin Zhang
{"title":"Development of a biological signal-based evaluator for robot-assisted upper-limb rehabilitation: a pilot study","authors":"Bo Sheng, Lihua Tang, O. Moosman, Chao Deng, S. Xie, Yanxin Zhang","doi":"10.1007/s13246-019-00783-0","DOIUrl":"https://doi.org/10.1007/s13246-019-00783-0","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"789 - 801"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00783-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41778179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-30DOI: 10.1007/s13246-019-00779-w
B. Thilakavathi, S. Shenbaga Devi, M. Malaiappan, K. Bhanu
{"title":"EEG power spectrum analysis for schizophrenia during mental activity","authors":"B. Thilakavathi, S. Shenbaga Devi, M. Malaiappan, K. Bhanu","doi":"10.1007/s13246-019-00779-w","DOIUrl":"https://doi.org/10.1007/s13246-019-00779-w","url":null,"abstract":"","PeriodicalId":55430,"journal":{"name":"Australasian Physical & Engineering Sciences in Medicine","volume":"42 1","pages":"887 - 897"},"PeriodicalIF":0.0,"publicationDate":"2019-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13246-019-00779-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42580600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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