<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402001000100013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ecocardiografía tridimensional: Técnica, Aplicaciones clínicas y perspectivas]]></article-title>
<article-title xml:lang="en"><![CDATA[Three-dimensional echocardiography]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinola Zavaleta]]></surname>
<given-names><![CDATA[Nilda]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roldán]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yánac Chávez]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero Cárdenas]]></surname>
<given-names><![CDATA[Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas Barrón]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Ecocardiografía ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2001</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2001</year>
</pub-date>
<volume>71</volume>
<numero>1</numero>
<fpage>88</fpage>
<lpage>95</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402001000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402001000100013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402001000100013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivo: La ecocardiografía tridimensional (3D) representa una nueva era en la cardiología contemporánea. Permite obtener imágenes de las estructuras cardíacas, lo más aproximadas, a su forma de anatomía macroscópica real. Aun cuando la técnica modo M y bidimensional, por más de 30 años ha incrementado notablemente las posibilidades de estudio del corazón, no es suficiente para reconstruir su compleja anatomía tridimensional. Se requiere de un esfuerzo mental extra para realizar la reconstrucción espacial tridimensional de múltiples imágenes en dos dimensiones, especialmente en las cardiopatías congénitas. Conclusiones: En la actualidad, la información adicional morfológica y funcional que aporta la técnica 3D en las diversas áreas de la cardiología clínica, quirúrgica y experimental justifican su uso más amplio. En el futuro esta técnica se convertirá en un estudio de anatomía patológica "virtual".]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objective: Three-dimensional echocardiography represents a new era in the contemporary cardiology, because depicts the cardiac structures in their realistic forms. This information can not be obtained using a two-dimensional perspective. Although two-dimensional (2D) and M-mode echocardiography has greatly enhanced the ability to visualize the functioning heart for more than 30 years, 3D interpretative mental skills are necessary to compile the 2D slices of the complex 3D anatomy, particularly in congenital heart disease. Conclusions: At present, its additional morphological and functional information in surgical decision-making and the increasing number of clinical questions than can be answered justify the clinical use of this technique. In the future it will the study of "virtual" pathologic anatomy.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ecocardiografía tridimensional]]></kwd>
<kwd lng="es"><![CDATA[Adquisición]]></kwd>
<kwd lng="es"><![CDATA[Reconstrucción]]></kwd>
<kwd lng="en"><![CDATA[Three-dimensional echocardiography]]></kwd>
<kwd lng="en"><![CDATA[Acquisition]]></kwd>
<kwd lng="en"><![CDATA[Reconstruction]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Revisi&oacute;n de temas cardiol&oacute;gicos</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Ecocardiograf&iacute;a tridimensional: T&eacute;cnica, Aplicaciones cl&iacute;nicas y perspectivas</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Three&#45;dimensional echocardiography</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Nilda Espinola Zavaleta,* Francisco Javier Rold&aacute;n,* Pedro Y&aacute;nac Ch&aacute;vez,* &Aacute;ngel Romero C&aacute;rdenas,* Jes&uacute;s Vargas Barr&oacute;n*</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>* Departamento de Ecocardiograf&iacute;a. Instituto Nacional de Cardiolog&iacute;a "Ignacio Ch&aacute;vez". (INCICH. Juan Badiano No. 1, 14080 M&eacute;xico, D.F.)</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Aceptado: 21 de Julio de 2000</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Objetivo:</b> La ecocardiograf&iacute;a tridimensional (3D) representa una nueva era en la cardiolog&iacute;a contempor&aacute;nea. Permite obtener im&aacute;genes de las estructuras card&iacute;acas, lo m&aacute;s aproximadas, a su forma de anatom&iacute;a macrosc&oacute;pica real. Aun cuando la t&eacute;cnica modo M y bidimensional, por m&aacute;s de 30 a&ntilde;os ha incrementado notablemente las posibilidades de estudio del coraz&oacute;n, no es suficiente para reconstruir su compleja anatom&iacute;a tridimensional. Se requiere de un esfuerzo mental extra para realizar la reconstrucci&oacute;n espacial tridimensional de m&uacute;ltiples im&aacute;genes en dos dimensiones, especialmente en las cardiopat&iacute;as cong&eacute;nitas.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Conclusiones:</b> En la actualidad, la informaci&oacute;n adicional morfol&oacute;gica y funcional que aporta la t&eacute;cnica 3D en las diversas &aacute;reas de la cardiolog&iacute;a cl&iacute;nica, quir&uacute;rgica y experimental justifican su uso m&aacute;s amplio. En el futuro esta t&eacute;cnica se convertir&aacute; en un estudio de anatom&iacute;a patol&oacute;gica "virtual".</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Ecocardiograf&iacute;a tridimensional. Adquisici&oacute;n. Reconstrucci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Objective:</b> Three&#45;dimensional echocardiography represents a new era in the contemporary cardiology, because depicts the cardiac structures in their realistic forms. This information can not be obtained using a two&#45;dimensional perspective. Although two&#45;dimensional (2D) and M&#45;mode echocardiography has greatly enhanced the ability to visualize the functioning heart for more than 30 years, 3D interpretative mental skills are necessary to compile the 2D slices of the complex 3D anatomy, particularly in congenital heart disease.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Conclusions:</b> At present, its additional morphological and functional information in surgical decision&#45;making and the increasing number of clinical questions than can be answered justify the clinical use of this technique. In the future it will the study of "virtual" pathologic anatomy.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Three&#45;dimensional echocardiography. Acquisition. Reconstruction.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El ultrasonido empleado en el estudio cardiovascular ha progresado en forma vertiginosa desde las im&aacute;genes en modo A, derivadas de un haz de ultrasonido delgado, hasta los registros gr&aacute;ficos de modo M, bidimensional y Doppler. De esta manera, la ecocardiograf&iacute;a se ha convertido en una herramienta diagn&oacute;stica muy importante de la cardiolog&iacute;a contempor&aacute;nea. Pero el coraz&oacute;n es un &oacute;rgano complejo tridimensional, que ha sido representado ecocardiogr&aacute;ficamente desde el punto de vista anat&oacute;mico s&oacute;lo en dos dimensiones. Los avances en la tecnolog&iacute;a de la computaci&oacute;n han permitido el desarrollo de la ecocardiograf&iacute;a tridimensional, que constituye una nueva era en la imagenolog&iacute;a cardiovascular.<sup>1&#45;4</sup> Las primeras im&aacute;genes tridimensionales del coraz&oacute;n humano fueron obtenidas en 1974 por Dekker y colaboradores.<sup>5</sup> Inicialmente, se utiliz&oacute; para la determinaci&oacute;n de los vol&uacute;menes ventriculares, con base en m&uacute;ltiples cortes seccionales de im&aacute;genes est&aacute;ticas, que requer&iacute;an de un trazado manual muy laborioso de los bordes endoc&aacute;rdicos.<sup>6,7</sup> En la actualidad, la adquisici&oacute;n de las im&aacute;genes se ha simplificado como consecuencia del desarrollo del control computarizado de los sistemas de rotaci&oacute;n y disparo para la obtenci&oacute;n de las im&aacute;genes tanto en adultos como en ni&ntilde;os.<sup>8&#45;10</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La compresi&oacute;n de los datos y las poderosas estaciones de trabajo computarizadas han automatizado muchos de los pasos y han disminuido el tiempo para el procesamiento pertinente. La obtenci&oacute;n de cortes en varios planos para reconstruir una imagen en perspectiva; la segmentaci&oacute;n y el proceso de sombreado se han ido refinando gradualmente, de manera que actualmente es posible hacer una reconstrucci&oacute;n din&aacute;mica de las patolog&iacute;as cardiovasculares con alta resoluci&oacute;n a pesar de la complejidad de &eacute;stas.<sup>11,12</sup> Muchos estudios experimentales y cl&iacute;nicos han demostrado que la aplicaci&oacute;n cl&iacute;nica de este m&eacute;todo es ya una realidad.<sup>8,9,13,14</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Aplicaciones cl&iacute;nicas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El mayor avance de la ecocardiograf&iacute;a tridimensional es la reproducci&oacute;n de numerosos y novedosos cortes seccionales en diferentes planos y la representaci&oacute;n tridimensional de las estructuras card&iacute;acas. La ecocardiograf&iacute;a tridimensional es de gran valor en las cardiopat&iacute;as cong&eacute;nitas, ya que permite una mejor evaluaci&oacute;n de las anormalidades morfol&oacute;gicas y una mejor comprensi&oacute;n de la compleja relaci&oacute;n espacial.<sup>15,16</sup> En los defectos interatriales e interventriculares permite definir con precisi&oacute;n el tama&ntilde;o, la forma y su relaci&oacute;n con las estructuras adyacentes.<sup>17&#45;19</sup> Es superior al ecocardiograma transesof&aacute;gico bidimensional en la valoraci&oacute;n de los dispositivos utilizados para el cierre de los defectos, especialmente cuando est&aacute;n colocados anormalmente.<sup>20,21</sup> Es de gran utilidad en el diagn&oacute;stico de las membranas at&oacute;ales y suba&oacute;rticas. Tambi&eacute;n permite diferenciar la v&aacute;lvula mitral de la tric&uacute;spide en la transposici&oacute;n corregida de las grandes arterias.<sup>22&#45;24</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En las enfermedades valvulares como la valvulopat&iacute;a mitral predice con precisi&oacute;n la morfolog&iacute;a de las valvas, comisuras y aparato subvalvular y permite determinar el &aacute;rea valvular mitral con un coeficiente de correlaci&oacute;n de 0.98 en relaci&oacute;n al tiempo de hemipresi&oacute;n.<sup>25,26</sup> En la valvuloplastia mitral con cat&eacute;ter bal&oacute;n permite visualizar la apertura de las comisuras, el sitio de ruptura de las valvas y determinar el &aacute;rea valvular por planimetr&iacute;a.<sup>27</sup> Es de gran utilidad en la insuficiencia valvular, ya que muestra el origen, la direcci&oacute;n y la relaci&oacute;n espacial de la geometr&iacute;a compleja de los flujos regurgitantes, especialmente los asim&eacute;tricos con efecto Coanda.<sup>28&#45;30</sup> En otras aplicaciones permite observar al prolapso valvular mitral o tricusp&iacute;deo como una protrusi&oacute;n del lado auricular de la v&aacute;lvula.<sup>31</sup> El ecocardiograma tridimensional es altamente sensible para el diagn&oacute;stico de ruptura de cuerdas tendinosas.<sup>32</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Tambi&eacute;n las anormalidades de la v&aacute;lvula a&oacute;rtica se pueden observar en m&uacute;ltiples proyecciones, especialmente del lado vascular y se pueden hacer c&aacute;lculos precisos del &aacute;rea valvular a&oacute;rtica por planimetr&iacute;a con un coeficiente de correlaci&oacute;n de 0.88 en relaci&oacute;n a la ecuaci&oacute;n de continuidad y a la planimetr&iacute;a por ecocardiograf&iacute;a transesof&aacute;gica bidimensional. En la insuficiencia a&oacute;rtica ayuda a una mejor determinaci&oacute;n de la geometr&iacute;a del flujo regurgitante as&iacute; como de la severidad de &eacute;ste.<sup>33&#45;35</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En relaci&oacute;n a la cirug&iacute;a valvular, proporciona informaci&oacute;n morfol&oacute;gica adicional de la v&aacute;lvula y complementaria hasta en el 25% de los casos.<sup>36</sup> Se pueden analizar las pr&oacute;tesis valvulares y valorar su funci&oacute;n con calidad excelente o adecuada en el 81% de los casos.</font></p>  	    <p align="justify"><font face="verdana" size="2">En la miocardiopat&iacute;a hipertr&oacute;fica idiop&aacute;tica, la ecocardiograf&iacute;a tridimensional logra detectar el involucro de la v&aacute;lvula mitral, lo que constituye una indicaci&oacute;n para el tratamiento quir&uacute;rgico de primera intenci&oacute;n.<sup>9</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En la cardiopat&iacute;a isqu&eacute;mica permite hacer una valoraci&oacute;n precisa de los vol&uacute;menes,<sup>37,38</sup> masa<sup>39,40</sup> y funci&oacute;n tanto del ventr&iacute;culo izquierdo como del ventr&iacute;culo derecho,<sup>41,42</sup> sin asumir presunciones geom&eacute;tricas como ocurre con otras t&eacute;cnicas. La correlaci&oacute;n que existe entre el eco tridimensional y la resonancia magn&eacute;tica en relaci&oacute;n a los vol&uacute;menes telediast&oacute;lico y telesist&oacute;lico del ventr&iacute;culo izquierdo es de 0.90 y 0.93, respectivamente. La correlaci&oacute;n de los vol&uacute;menes ventriculares entre el eco tridimensional y la ventriculograf&iacute;a es mayor con una r = 0.99. Existe excelente correlaci&oacute;n entre la masa y el grosor parietal del ventr&iacute;culo izquierdo al compararlo con las medidas anat&oacute;micas con un coeficiente de correlaci&oacute;n de 0.98 y 0.93, respectivamente.<sup>37,40</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Tambi&eacute;n se han comparado los vol&uacute;menes y la masa ventricular derecha obtenidos por eco tridimensional y resonancia magn&eacute;tica y el coeficiente de correlaci&oacute;n entre estas dos t&eacute;cnicas para el volumen telediast&oacute;lico es de 0.95, para el tele&#45;sist&oacute;lico de 0.87 y para la masa ventricular derecha de 0.81.<sup>41,42</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Es de utilidad en el an&aacute;lisis cualitativo y cuantitativo de las anormalidades de la movilidad parietal regional ventricular<sup>43</sup> y en la perfusi&oacute;n mioc&aacute;rdica con agentes de contraste que cruzan la barrera pulmonar.<sup>44</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En las masas intracard&iacute;acas o intravasculares, incluyendo vegetaciones, trombos o placas ateromatosas, permite hacer un an&aacute;lisis cualitativo (sitio de implantaci&oacute;n, tama&ntilde;o y movilidad) y cuantitativo (medidas precisas de las dimensiones y vol&uacute;menes).<sup>9,45</sup> Tambi&eacute;n ayuda a valorar las enfermedades de la aorta como la dilataci&oacute;n, los aneurismas, la disecci&oacute;n y la coartaci&oacute;n.<sup>46</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Requerimientos para la reconstrucci&oacute;n tridimensional</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En la actualidad la adquisici&oacute;n de las im&aacute;genes para la reconstrucci&oacute;n tridimensional es fundamentalmente secuencial. Los pasos esenciales para una reconstrucci&oacute;n tridimensional son <i>(<a href="#af1">Fig. 1</a>):</i></font></p> 	    ]]></body>
<body><![CDATA[<p align="center"><a name="af1"></a></p> 	    <p align="center"><img src="/img/revistas/acm/v71n1/a13f1.jpg"></p>  	    <blockquote>     <p align="justify"><font face="verdana" size="2">1. Adquisici&oacute;n y almacenamiento digital de las im&aacute;genes bidimensionales sincronizadas con el electrocardiograma y la respiraci&oacute;n <i>(<a href="#af2">Fig. 2</a>),</i> para mantener un registro espacial y temporal de las im&aacute;genes. La adquisici&oacute;n de las im&aacute;genes bidimensionales se realiza cada 2<sup>Âº</sup> &oacute; 3<sup>Âº</sup>, hasta completar 180<sup>Âº</sup> con un software especial que est&aacute; integrado en los nuevos equipos de ultrasonido card&iacute;aco; las im&aacute;genes son almacenadas en discos &oacute;pticos. El paso crucial para una reconstrucci&oacute;n tridmensional adecuada es la adquisici&oacute;n de las im&aacute;genes bidimensionales. Hay diferentes m&eacute;todos para adquirir las im&aacute;genes:</font></p>     <p align="center"><a name="af2"></a></p>     <p align="center"><img src="/img/revistas/acm/v71n1/a13f2.jpg"></p>  		    <blockquote>     <p align="justify"><font face="verdana" size="2">a) Adquisici&oacute;n randomizada, donde la adquisici&oacute;n de los datos se realiza con el transductor en varias direcciones en una ventana ac&uacute;stica o con varias posiciones del transductor en diferentes ventanas ac&uacute;sticas. Se puede realizar con brazo mec&aacute;nico o con localizador ac&uacute;stico o electromagn&eacute;tico.</font></p>  			    <p align="justify"><font face="verdana" size="2">b) Adquisici&oacute;n secuencial tomogr&aacute;fica, cuando las im&aacute;genes bidimensionales de varias regiones del coraz&oacute;n no se adquieren en forma simult&aacute;nea, esto es fundamental para relacionar cada imagen con otras en el espacio y el tiempo. Se puede hacer en cortes paralelos de im&aacute;genes bidimensionales que son equidistantes, es decir que son iguales en tama&ntilde;o y distancia <i>(<a href="#af3">Fig. 3</a>)</i> o con rastreo tipo abanico con im&aacute;genes que tienen &aacute;ngulos iguales <i>(<a href="#af4">Fig. 4</a>).</i> Al igual que en los cortes paralelos, en el rastreo tipo abanico el movimiento del transductor se puede operar manualmente o con un motor controlado a trav&eacute;s de una computadora. Tambi&eacute;n se utiliza la t&eacute;cnica rotacional, donde el transductor rota alrededor de un punto pivote y se usa idealmente con transductores transtor&aacute;cicos o transesof&aacute;gicos multiplanares <i>(<a href="#af5">Fig.</a></i><a href="#af5"> 5</a>).<sup>47,48</sup></font></p> 			    <p align="center"><a name="af3"></a></p> 			    ]]></body>
<body><![CDATA[<p align="center"><img src="/img/revistas/acm/v71n1/a13f3.jpg"></p> 			    <p align="center"><a name="af4"></a></p> 			    <p align="center"><img src="/img/revistas/acm/v71n1/a13f4.jpg"></p> 			    <p align="center"><a name="af5"></a></p> 			    <p align="center"><img src="/img/revistas/acm/v71n1/a13f5.jpg"></p> 		</blockquote>  		    <p align="justify"><font face="verdana" size="2">2. Procesamiento de la im&aacute;genes y reconstrucci&oacute;n tridimensional, que incluye conversi&oacute;n geom&eacute;trica de las im&aacute;genes adquiridas en datos c&uacute;bicos, interpolaci&oacute;n y segmentaci&oacute;n. Este procedimiento se realiza en forma separada en una estaci&oacute;n de trabajo computarizada.</font></p>  		    <p align="justify"><font face="verdana" size="2">3. Presentaci&oacute;n de las im&aacute;genes tridimensionales con &iacute;ndices cuantitativos y funciones especiales. Hay 2 maneras de presentar las im&aacute;genes: de superficie, creando im&aacute;genes tridimensionales con apariencia s&oacute;lida y de volumen, obteniendo im&aacute;genes que pueden tener apariencia s&oacute;lida o transparente. Esto depende del nivel de opacificaci&oacute;n, sombreado (escala de grises, distancia, gradiente y textura) y luminosidad, lo que permite ver la cavidad ventricular a trav&eacute;s del miocardio <i>(<a href="#af6">Figs. 6</a>, <a href="#af7">7</a>y <a href="/img/revistas/acm/v71n1/a13f8.jpg" target="_blank">8</a>).</i></font></p> 		    <p align="center"><a name="af6"></a></p> 		    <p align="center"><img src="/img/revistas/acm/v71n1/a13f6.jpg"></p> 		    <p align="center"><a name="af7"></a></p> 		    ]]></body>
<body><![CDATA[<p align="center"><img src="/img/revistas/acm/v71n1/a13f7.jpg"></p>  		    <p align="justify"><font face="verdana" size="2">Hay 2 formas de reconstrucci&oacute;n tridimensional "on line" &#45;en tiempo real y "off line" &#45;primero se adquieren las im&aacute;genes y luego se reconstruyen. La t&eacute;cnica que nosotros utilizamos es "off line".</font></p> 	</blockquote>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Impacto cl&iacute;nico</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Esta t&eacute;cnica permite obtener im&aacute;genes tridimensionales de la anatom&iacute;a card&iacute;aca normal y patol&oacute;gica en proyecciones nunca antes vistas, as&iacute; como datos cuantitativos m&aacute;s precisos que los actuales.<sup>8,9,14</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Limitaciones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Es un procedimiento que consume tiempo y requiere de personal entrenado en la adquisici&oacute;n y reconstrucci&oacute;n de im&aacute;genes tridimensionales. La curva de aprendizaje es relativamente lenta. Es una t&eacute;cnica extremadamente sensible a las ganancias y movimientos durante la adquisici&oacute;n, factores que pueden limitar una adecuada reconstrucci&oacute;n tridimensional.<sup>8</sup> Adem&aacute;s, la resoluci&oacute;n se deteriora con la profundidad. Por el momento esta t&eacute;cnica es utilizada solamente en protocolos de investigaci&oacute;n y no en la pr&aacute;ctica cl&iacute;nica habitual.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Futuro al final del milenio</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se pretende realizar una adquisici&oacute;n ultrar&aacute;pida y ya existen equipos que permiten obtener im&aacute;genes volum&eacute;tricas en tiempo real. Se pretende desarrollar la cardiotom&iacute;a electr&oacute;nica y hacer modelos del coraz&oacute;n y de las estructuras card&iacute;acas, que incluyen la masa ventricular disfuncionante, la movilidad parietal y la perfusi&oacute;n mioc&aacute;rdica en tiempo real. Tambi&eacute;n se ha iniciado la investigaci&oacute;n <sup>9,49&#45;53</sup> de nuevos m&eacute;todos como la realidad virtual y la holograf&iacute;a &#45;"modelos de coraz&oacute;n en la mano".</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. 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