<?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>0864-084X</journal-id>
<journal-title><![CDATA[Nucleus]]></journal-title>
<abbrev-journal-title><![CDATA[Nucleus]]></abbrev-journal-title>
<issn>0864-084X</issn>
<publisher>
<publisher-name><![CDATA[CUBAENERGIA]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-084X2017000200003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aplicaciones del PET/CT en oncología]]></article-title>
<article-title xml:lang="en"><![CDATA[PET/CT applications in oncology]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliva González]]></surname>
<given-names><![CDATA[Juan P]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Ramírez]]></surname>
<given-names><![CDATA[Aldo]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baum]]></surname>
<given-names><![CDATA[Richard Paul]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="AA1">
<institution><![CDATA[,Centro PET/CT e Imagen Molecular Departamento Medicina Nuclear Instituto de Oncología y Radiobiología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="AA2">
<institution><![CDATA[,Theranostics Center for Molecular Radiotherapy and Molecular Imaging Zentralklinik Bad Berka ]]></institution>
<addr-line><![CDATA[Bad Berka ]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<numero>62</numero>
<fpage>10</fpage>
<lpage>13</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-084X2017000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-084X2017000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-084X2017000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[PET significa Tomografía por Emisión de Positrones y es una técnica de medicina nuclear en la cual se emplean radiofármacos marcados con emisores de positrones que permiten obtener imágenes bioquímico-metabólicas del cuerpo humano. El PET/CT permite obtener imágenes multimodales que combinan información anatómica y metabólica y permiten realizar un diagnóstico más seguro de un tumor o de las metástasis locales o a distancia en un órgano o tejido. Otros equipos multimodales combinan las imágenes metabólicas con la resonancia magnética nuclear. El PET/CT se emplea fundamentalmente en Oncología (85-90 %), Neurología, Cardiología, Inflamación e Infección, aunque actualmente también es empleado en diferentes patologías médicas y quirúrgicas. En el presente trabajo deseamos mostrar qué es el PET/CT y su utilidad en la Oncología]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[PET means Positron Emission Tomography, it is a nuclear medicine technique in which radiopharmaceuticals labeled with positron emitters are used to obtain biochemical-metabolic images of the human body. The use of PET / CT contributes to obtain multimodal images that combine anatomical and metabolic information, allowing a more reliable diagnosis of a tumor or local or distant metastases in an organ or tissue. Other multimodal devices combine metabolic imaging with nuclear magnetic resonance. PET/CT is mainly used in Oncology (85-90%), Neurology, Cardiology, Inflammation and Infection although it is currently also used in different medical and surgical pathologies. The present work is aimed at showing what PET/CT is and how useful it is in Oncology]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[tomografía computerizada con positrón]]></kwd>
<kwd lng="es"><![CDATA[tomografía computarizada]]></kwd>
<kwd lng="es"><![CDATA[neoplasmas]]></kwd>
<kwd lng="es"><![CDATA[diagnosis]]></kwd>
<kwd lng="es"><![CDATA[terapia]]></kwd>
<kwd lng="es"><![CDATA[tratamiento de imágenes]]></kwd>
<kwd lng="en"><![CDATA[positron computed tomography]]></kwd>
<kwd lng="en"><![CDATA[computerized tomography]]></kwd>
<kwd lng="en"><![CDATA[neoplasms]]></kwd>
<kwd lng="en"><![CDATA[diagnosis]]></kwd>
<kwd lng="en"><![CDATA[therapy]]></kwd>
<kwd lng="en"><![CDATA[image processing]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>PANORAMA NUCLEAR</b></font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><font size="4"><strong><font face="Verdana, Arial, Helvetica, sans-serif">Aplicaciones  del PET/CT en oncolog&iacute;a</font></strong></font></p>     <p align="left"> <font size="4"><strong></strong></font><font size="3"><strong><font face="Verdana, Arial, Helvetica, sans-serif">PET/CT applications in oncology</font></strong></font></p>     <p align="left"><font size="3" face="Verdana, Arial, Helvetica, sans-serif">&nbsp;</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <strong>    <br> </strong><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Juan  P. Oliva Gonz&aacute;lez<sup>1</sup>, Aldo  Mart&iacute;nez Ram&iacute;rez<sup>1</sup>, Richard  Paul Baum<sup>2</sup></strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><sup>1</sup>Centro  PET/CT e Imagen Molecular. Departamento Medicina Nuclear. Instituto de  Oncolog&iacute;a y Radiobiolog&iacute;a    <br>     <sup>2</sup>Theranostics  Center for Molecular Radiotherapy and Molecular Imaging, Zentralklinik Bad  Berka, Bad Berka, Germany</font></p>     <p><a href="mailto:odrizo@instec.cu"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">joliva@infomed.sld.cu</font></a>    ]]></body>
<body><![CDATA[<br> </p> <hr>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">PET significa Tomograf&iacute;a por Emisi&oacute;n de Positrones y es una t&eacute;cnica de  medicina nuclear en la cual&nbsp; se emplean  radiof&aacute;rmacos marcados con emisores de positrones que permiten obtener im&aacute;genes  bioqu&iacute;mico-metab&oacute;licas del cuerpo humano. El PET/CT permite obtener im&aacute;genes multimodales  que combinan informaci&oacute;n anat&oacute;mica y&nbsp;  metab&oacute;lica y permiten realizar un diagn&oacute;stico m&aacute;s seguro de un tumor o  de las met&aacute;stasis locales o a distancia en un &oacute;rgano o tejido. Otros equipos  multimodales combinan las im&aacute;genes metab&oacute;licas con la resonancia magn&eacute;tica  nuclear. El PET/CT se emplea fundamentalmente en Oncolog&iacute;a (85-90 %),  Neurolog&iacute;a, Cardiolog&iacute;a, Inflamaci&oacute;n e Infecci&oacute;n, aunque actualmente tambi&eacute;n es  empleado en diferentes patolog&iacute;as m&eacute;dicas y quir&uacute;rgicas. En el&nbsp; presente trabajo deseamos mostrar qu&eacute; es el  PET/CT y su utilidad en la Oncolog&iacute;a.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Palabras claves:</strong> tomograf&iacute;a computerizada con positr&oacute;n;  tomograf&iacute;a computarizada; neoplasmas; diagnosis; terapia; tratamiento de  im&aacute;genes.</font></p> <hr>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ABSTRACT</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">PET means Positron Emission Tomography, it is a  nuclear medicine technique in which radiopharmaceuticals labeled with positron  emitters are used to obtain biochemical-metabolic images of the human body. The  use of PET / CT contributes to obtain multimodal images that combine anatomical  and metabolic information, allowing a more reliable diagnosis of a tumor or  local or distant metastases in an organ or tissue. Other multimodal devices  combine metabolic imaging with nuclear magnetic resonance. PET/CT is mainly  used in Oncology (85-90%), Neurology, Cardiology, Inflammation and Infection  although it is currently also used in different medical and surgical  pathologies. The present work is aimed at showing what PET/CT is and how useful  it is in Oncology.&nbsp;&nbsp; </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Key words: </strong>positron computed  tomography; computerized tomography; neoplasms; diagnosis; therapy; image  processing.</font></p> <hr> <h1>&nbsp;</h1>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><strong>INTRODUCCI&Oacute;N</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Todas las enfermedades, tambi&eacute;n el c&aacute;ncer,  comienzan siempre a un nivel molecular donde no se puede todav&iacute;a sospecharlas o  verlas. Ser&iacute;a muy interesante tener un procedimiento diagn&oacute;stico que permitiera  detectar tempranamente las alteraciones metab&oacute;licas, aun antes de que se  manifestaran las alteraciones anat&oacute;micas. Con el PET/CT tenemos ahora una  herramienta que nos permite estar muy cerca de ese resultado. La uni&oacute;n de  procedimientos de im&aacute;genes metab&oacute;licas y anat&oacute;micas permite la diferenciaci&oacute;n  entre tejido sano y patol&oacute;gico en etapas tempranas del desarrollo de la  enfermedad (1-8). </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  El PET/CT (Tomograf&iacute;a de Emisi&oacute;n de  Positrones + Tomograf&iacute;a Axial Computarizada) es un instrumento h&iacute;brido  integrado por un equipo nuclear formador de im&aacute;genes gammagr&aacute;ficas, mediante la  detecci&oacute;n de 2 fotones gamma de 511 keV (PET) que se producen como resultado  del proceso de aniquilaci&oacute;n positr&oacute;n-electr&oacute;n y un equipo de tomograf&iacute;a axial  computarizada (CT) que permite obtener simult&aacute;neamente im&aacute;genes metab&oacute;licas  (PET) y anat&oacute;micas de la regi&oacute;n del organismo bajo estudio. Estas im&aacute;genes ya  fusionadas muestran el sitio anat&oacute;mico exacto de la lesi&oacute;n y su viabilidad  metab&oacute;lica con un nivel de resoluci&oacute;n espacial mucho mas elevado (del orden de  hasta 4.6 mil&iacute;metros)  que las im&aacute;genes gammagr&aacute;ficas convencionales obtenidas mediante C&aacute;mara Gamma (9-14).</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  El PET/CT se emplea fundamentalmente en  Oncolog&iacute;a (85-90 %) (3-4), Neurolog&iacute;a, Cardiolog&iacute;a, Inflamaci&oacute;n e Infecci&oacute;n  aunque tambi&eacute;n es empleado en diferentes patolog&iacute;as m&eacute;dicas y quir&uacute;rgicas.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  En nuestro pa&iacute;s el primer equipo PET/CT est&aacute;  instalado en el Instituto Nacional de Oncolog&iacute;a y Radiobiolog&iacute;a (Inor) <a href="#f01036217">(Figura 1)</a>. Se  trata de un equipo PHILIPS Gemini TF64 que opera completamente en modo 3D.  Primero est&aacute; situado el CT y a continuaci&oacute;n, el PET y el paciente est&aacute; acostado  en una camilla que va pasando a trav&eacute;s de los &ldquo;t&uacute;neles&rdquo;&nbsp; de ambos instrumentos.</font></p>     <p align="center"><img src="/img/revistas/nuc/n62/f01036217.jpg" width="390" height="279"><a name="f01036217"></a></p>     
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El estudio se desarrolla de la siguiente  manera:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Explicaci&oacute;n detallada al paciente del  procedimiento a realizarse </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Inyecci&oacute;n del Radiof&aacute;rmaco en una vena del  brazo (0.14 MBq/kg) </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Espera luego de la inyecci&oacute;n de 1 hora  aproximadamente </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Realizaci&oacute;n de las Im&aacute;genes desde la cabeza  hasta la rodilla, con una duraci&oacute;n entre 10-20 minutos</font></li>     </ul>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Todos los pacientes  deber&aacute;n firmar el consentimiento de la realizaci&oacute;n del estudio una vez que han recibido  la explicaci&oacute;n adecuada sobre el mismo por parte de m&eacute;dico. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>&iquest;Qu&eacute; nos brinda el PET/CT en oncolog&iacute;a?</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  El PET/CT se emplea  en diferentes fases de la enfermedad oncol&oacute;gica y en su tratamiento [15-17].</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Antes del tratamiento  el PET/CT se emplea en la b&uacute;squeda del tumor, sobre todo en su caracterizaci&oacute;n  y estadiamiento. En el tratamiento del c&aacute;ncer (Quimio/Radioterapia/Bioterapia, etc)  nos permite conocer el &eacute;xito del tratamiento durante o inmediatamente despu&eacute;s  de terminar el mismo. El seguimiento el PET/CT nos permite un r&aacute;pido  reconocimiento de una recidiva tumoral o met&aacute;stasis a distancia.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Estos campos de  aplicaci&oacute;n los explicaremos m&aacute;s exactamente en los ac&aacute;pites de:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">B&uacute;squeda del Tumor  y determinaci&oacute;n de su Malignidad</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Determinaci&oacute;n del Estadio  Tumoral</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Determinaci&oacute;n  temprana del &eacute;xito del tratamiento</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Seguridad despu&eacute;s  de la operaci&oacute;n del tumor</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Empleo conjunto en  la Planificaci&oacute;n de Radioterapia</font></li>     ]]></body>
<body><![CDATA[</ul>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>&nbsp;</strong></font><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>B&uacute;squeda  del Tumor y determinaci&oacute;n de su Malignidad</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> No en todas, pero s&iacute; en un gran grupo de enfermedades oncol&oacute;gicas, el  PET/CT nos brinda en la b&uacute;squeda del tumor valiosos datos adicionales, ya que  el mismo visualiza la funci&oacute;n celular. Esto es as&iacute; en los siguientes casos:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En los tumores en  la regi&oacute;n de la cabeza y el cuello, frecuentemente es muy dif&iacute;cil localizar el  tumor primario, aun cuando ya hay ganglios linf&aacute;ticos metast&aacute;sicos [18-20] </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En el caso de  lesiones nodulares no bien definidas del pulm&oacute;n, el PET/CT puede diferenciar  entre benignidad y malignidad. Los pacientes con elevado riesgo operatorio de  tener un PET/CT negativo se evitan una operaci&oacute;n innecesaria [21-23]</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En el caso de  marcadores tumorales elevados, el PET/CT puede localizar el sitio del tumor [24-27],  ver <a href="#f02036217">Figura 2</a>.</font></li>     </ul>     <p align="center"><img src="/img/revistas/nuc/n62/f02036217.jpg" width="393" height="386"><a name="f02036217"></a></p>     
<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Determinaci&oacute;n  del Estad&iacute;o Tumoral</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Para tener un &oacute;ptimo resultado en el tratamiento de un paciente con  c&aacute;ncer es esencial conocer en qu&eacute; estadio de la enfermedad se encuentra. El  PET/CT brinda, debido al valor funcional del mismo en relaci&oacute;n con los otros  medios de im&aacute;genes (Rx, CT, RMN), valiosas ventajas. Inclusive met&aacute;stasis muy  peque&ntilde;as pueden ser detectadas con esta t&eacute;cnica nuclear [28-30].</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El PET/CT se emplea exitosamente en los siguientes tipos tumorales:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Carcinomas Pulmonares  en diferentes tipos histol&oacute;gicos</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores de Cabeza y  Cuello</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Linfomas Malignos</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">C&aacute;ncer de Es&oacute;fago y  Est&oacute;mago </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Determinados tipos  de c&aacute;ncer de tiroides</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores  Neuroendocrinos</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores  Ginecol&oacute;gicos</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores de  Clon-Recto</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores del Tracto  Urogenital</font></li>       ]]></body>
<body><![CDATA[<li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Carcinoma de  Pr&oacute;stata</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Melanoma</font></li>     </ul>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Determinaci&oacute;n  temprana del &eacute;xito del tratamiento</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Es muy importante conocer tempranamente el resultado de un tratamiento,  ya sea de Quimio o Radioterapia realizado a un paciente.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  La efectividad de un tratamiento citost&aacute;tico combinado var&iacute;a de un  paciente y de un tumor a otro. Debido a los severos efectos colaterales de este  tratamiento, se desea conocer lo antes posible si se ha logrado o no el efecto  deseado. El PET/CT puede revelar en un estadio temprano el &eacute;xito o no del  tratamiento realizado. Inclusive durante el tratamiento citost&aacute;tico, despu&eacute;s  del segundo o tercer ciclo del mismo se puede hacer lo que se conoce como <strong>interin-PET</strong> y conocer si el tratamiento que se est&aacute; llevando a cabo es efectivo o no. Esto  permite, entonces, hacer una correcci&oacute;n en los medicamentos que se est&aacute;n  empleando, lo cual es beneficioso al paciente y permite ahorrar recursos [31-  33]. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Especialmente es empleado en la determinaci&oacute;n temprana del &eacute;xito del  tratamiento Quimio/Radioterapia en los siguientes tipos de c&aacute;nceres:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Linfoma Maligno </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Met&aacute;stasis de  tumores de colon-recto</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Carcinoma de mama</font></li>       ]]></body>
<body><![CDATA[<li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Carcinomas  Pulmonares en diferentes tipos histol&oacute;gicos</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores del Es&oacute;fago  y Est&oacute;mago </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores de Pr&oacute;stata</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores de Cabeza y  Cuello</font></li>     </ul>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Seguridad  despu&eacute;s de la operaci&oacute;n del tumor</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Cuando un tumor primario ha sido operado en su totalidad o luego de un  tratamiento de Quimioterapia o Radioterapia no es visible en los estudios  imagenol&oacute;gicos, es de gran valor conocer si existe o no tejido tumoral viable  remanente. Lo importante, entonces, es un buen seguimiento y luego de un tiempo  determinado debe estudiarse al paciente para descartar una recidiva tumoral o  met&aacute;stasis a distancia provocada por c&eacute;lulas tumorales que hayan quedado  despu&eacute;s del tratamiento.    <br>   Un gran problema es la diferenciaci&oacute;n entre tejido cicatricial y tejido  tumoral. Aqu&iacute; el PET/CT juega un papel muy importante en poder determinar de cu&aacute;l  de las dos posibilidades se trata [34-37].</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En los siguientes tipos de c&aacute;nceres es muy importante en su seguimiento  el empleo de la tecnolog&iacute;a PET/CT:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">C&aacute;ncer de colon-recto</font></li>       ]]></body>
<body><![CDATA[<li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Carcinomas  Pulmonares en diferentes tipos histol&oacute;gicos </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores cerebrales</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tumores de Cabeza y  Cuello</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Melanoma Maligno</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Algunos tipos de  tumores ginecol&oacute;gicos</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Determinadas formas  de C&aacute;ncer de Tiroides </font></li>     </ul>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Empleo  conjunto en la Planificaci&oacute;n de Radioterapia</strong></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Otra aplicaci&oacute;n que en los &uacute;ltimos a&ntilde;os ha tenido un impetuoso desarrollo  es la aplicaci&oacute;n del PET/CT en la planificaci&oacute;n de los tratamientos de  Radioterapia. El PET/CT aporta informaci&oacute;n molecular de la biolog&iacute;a y extensi&oacute;n  de muchos tumores que dan ventajas importantes sobre otras modalidades de  im&aacute;genes, entre ellas se destacan las siguientes [38-41]:</font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Im&aacute;genes de lesiones que no aparecen en las im&aacute;genes de CT o MR, tales  como n&oacute;dulos linf&aacute;ticos insospechados o met&aacute;stasis a distancia</font></li>       ]]></body>
<body><![CDATA[<li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Previene la irradiaci&oacute;n de anormalidades f&uacute;tiles que no contienen tumor  como la atelectasia</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Im&aacute;genes de subgrupos tumorales biol&oacute;gicamente diversos que     potencialmente permiten administrar dosis de radiaci&oacute;n basadas en la carga  tumoral o la radiosensibilidad</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Evaluaci&oacute;n temprana de la respuesta durante o despu&eacute;s de la quimioterapia</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Desarrollo de la &quot;terapia adaptativa&quot; en la cual los posibles  cambios del volumen blanco potencialmente se tienen en cuenta durante el curso  del tratamiento</font></li>     </ul>     <p> <ul>     <p></p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><strong>REFERENCIAS</strong></font> <strong><font size="3" face="Verdana, Arial, Helvetica, sans-serif">BIBLIOGR&Aacute;FICAS </font></strong></p>     <!-- ref --><p>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif">[1]. 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J Nucl Med. 2017; 58(5): 737-743.    </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong>Recibido:</strong> 22 de mayo de 2017     <br>     <strong>Aceptado:</strong></font> <font size="2" face="Verdana, Arial, Helvetica, sans-serif">17 de octubre de 2017 </font></p>     </ul>     ]]></body><back>
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