{"version":"1.0","provider_name":"All About Cardiovascular System and Disorders","provider_url":"https:\/\/johnsonfrancis.org\/professional","author_name":"Johnson Francis","author_url":"https:\/\/johnsonfrancis.org\/professional\/author\/jf\/","title":"Aliasing and The Nyquist Limit in Doppler Echocardiography - All About Cardiovascular System and Disorders","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"HHNJcwHYb6\"><a href=\"https:\/\/johnsonfrancis.org\/professional\/aliasing-and-the-nyquist-limit-in-doppler-echocardiography\/\">Aliasing and The Nyquist Limit in Doppler Echocardiography<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/johnsonfrancis.org\/professional\/aliasing-and-the-nyquist-limit-in-doppler-echocardiography\/embed\/#?secret=HHNJcwHYb6\" width=\"600\" height=\"338\" title=\"&#8220;Aliasing and The Nyquist Limit in Doppler Echocardiography&#8221; &#8212; All About Cardiovascular System and Disorders\" data-secret=\"HHNJcwHYb6\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/johnsonfrancis.org\/professional\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/johnsonfrancis.org\/professional\/wp-content\/uploads\/2026\/07\/Aliasing-and-The-Nyquist-Limit-in-Doppler-Echocardiography.jpg","thumbnail_width":1320,"thumbnail_height":742,"description":"In Doppler echocardiography, aliasing is an artifact that occurs when the Doppler shift frequency exceeds the system&#8217;s ability to sample it accurately. The threshold at which this signal distortion begins is known as the Nyquist limit. The Nyquist limit dictates that the maximum measurable Doppler shift without aliasing is exactly half of the Pulse Repetition [&hellip;]"}