{"id":640,"date":"2014-09-12T12:01:57","date_gmt":"2014-09-12T17:01:57","guid":{"rendered":"http:\/\/test.pegasuslectures.com\/blog\/?p=640"},"modified":"2015-01-27T18:19:37","modified_gmt":"2015-01-27T23:19:37","slug":"quick-concepts-acoustic-shadowing","status":"publish","type":"post","link":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/2014\/09\/12\/quick-concepts-acoustic-shadowing\/","title":{"rendered":"Quick Concepts: Acoustic Shadowing"},"content":{"rendered":"<p style=\"text-align: center\"><strong>QUICK CONCEPT : ACOUSTIC SHADOWING<\/strong><\/p>\n<p><a href=\"https:\/\/test.pegasuslectures.com\/blog\/wp-content\/uploads\/2014\/09\/Summer_shade.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignleft wp-image-772 \" src=\"https:\/\/test.pegasuslectures.com\/blog\/wp-content\/uploads\/2014\/09\/Summer_shade-300x238.png\" alt=\"Summer_shade\" width=\"235\" height=\"187\" srcset=\"https:\/\/www.pegasuslectures.com\/blog\/wp-content\/uploads\/2014\/09\/Summer_shade-300x238.png 300w, https:\/\/www.pegasuslectures.com\/blog\/wp-content\/uploads\/2014\/09\/Summer_shade.png 446w\" sizes=\"(max-width: 235px) 100vw, 235px\" \/><\/a>If you have spent any time in Texas during the summer months, you will appreciate the value of shadowing &#8211; or the more popular descriptive term: <strong>shade<\/strong>.<\/p>\n<p>While the fact that it is <strong>HOT<\/strong>\u00a0in Texas is no revelation, the understanding of how sound (similarly to light) can generate a \u2018shadow\u2019 has relevant clinical importance.<\/p>\n<p><!--more--><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_771\" style=\"width: 245px\" class=\"wp-caption alignright\"><img aria-describedby=\"caption-attachment-771\" decoding=\"async\" loading=\"lazy\" class=\"wp-image-771\" src=\"https:\/\/test.pegasuslectures.com\/blog\/wp-content\/uploads\/2014\/09\/shadow_artifact-300x204.png\" alt=\"\" width=\"235\" height=\"158\" \/><p id=\"caption-attachment-771\" class=\"wp-caption-text\">SHADOWING ARTIFACT ASSOCIATED WITH IMAGING A FETAL CRANIUM<\/p><\/div>\n<p>Acoustic shadowing is an <strong><em>attenuation artifact<\/em><\/strong>, implying a change to\u00a0the intensity\u00a0of the ultrasound signal.\u00a0<strong><em>Locational artifacts<\/em><\/strong>, by comparison, result in structures appearing displaced in the ultrasound image from\u00a0the \u2018true\u2019 location, or indicating the appearance of a structure that is not \u2018real\u2019.<\/p>\n<p>On many occasions, I have emphasized that artifacts are not necessarily \u2018<strong>bad<\/strong>\u2019.\u00a0 With a proper understanding of the underlying physics of how artifacts are generated, <span style=\"text-decoration: underline\">you can draw valuable insights from the existence of an artifact<\/span> in an ultrasound study.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em>This subject matter is discussed more thoroughly in Chapter 8: Artifacts, of <a href=\"https:\/\/test.pegasuslectures.com\/faculty\/frank_miele.php\">Frank Miele\u2019s<\/a><\/em> <strong><a href=\"http:\/\/test.pegasuslectures.com\/product_info.php\/products_id\/52543\">Ultrasound Physics and Instrumentation<\/a> (5<sup>th<\/sup> edition)<\/strong>.\u00a0 <em>Acoustic shadowing and attenuation artifacts are referenced specifically on pages 275-276 and 284-285.<\/em><\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/X-lEqIysJl4?feature=oembed\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>QUICK CONCEPT : ACOUSTIC SHADOWING If you have spent any time in Texas during the summer months, you will appreciate the value of shadowing &#8211; or the more popular descriptive term: shade. While the fact that it is HOT\u00a0in Texas &hellip; <a href=\"https:\/\/www.pegasuslectures.com\/blog\/index.php\/2014\/09\/12\/quick-concepts-acoustic-shadowing\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[25,27,28,33,2,26],"_links":{"self":[{"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/640"}],"collection":[{"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=640"}],"version-history":[{"count":23,"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/640\/revisions"}],"predecessor-version":[{"id":1040,"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/640\/revisions\/1040"}],"wp:attachment":[{"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pegasuslectures.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}