<?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>1561-3194</journal-id>
<journal-title><![CDATA[Revista de Ciencias Médicas de Pinar del Río]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Ciencias Médicas]]></abbrev-journal-title>
<issn>1561-3194</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1561-31942020000500008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización dosimétrica de equipos para radioterapia superficial con rayos X]]></article-title>
<article-title xml:lang="en"><![CDATA[Dosimetric characterization of X-ray Surface Radiotherapy Equipments]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguiar Ferro]]></surname>
<given-names><![CDATA[Yoval]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nazco Torres]]></surname>
<given-names><![CDATA[Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfonso Laguardia]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Milian Baldor]]></surname>
<given-names><![CDATA[Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bory Porras]]></surname>
<given-names><![CDATA[Lucien]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ciencias Médicas de Pinar del Río Centro de Atención al Paciente Oncológico de Pinar del Río ]]></institution>
<addr-line><![CDATA[Pinar del Río ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2020</year>
</pub-date>
<volume>24</volume>
<numero>5</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1561-31942020000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1561-31942020000500008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1561-31942020000500008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  en Cuba, en el 2018, fueron diagnosticados un total de 12 070 nuevos casos de cáncer de piel, de los cuales se estima que 11 587 corresponden a la variante no melanómica. La radioterapia con rayos x está considerada como la primera opción de tratamiento en muchos de estos casos. Recientemente, el sistema nacional de salud, adquirió cuatro equipos de la marca SENSUS SRT-100TM para el tratamiento del NMSC.  Objetivo:  desarrollar una metodología estandarizada para la caracterización dosimétrica de los equipos de radioterapia superficial con rayos X instalados en Cuba.  Métodos:  se caracterizaron cuatro equipos de radioterapia SENSUS SRT-100TM para cada una de sus calidades radiológicas, en términos de linealidad, estabilidad, capa hemirreductora, tasas de dosis de referencia, perfiles de dosis, factores de cono y porcentaje de dosis en profundidad. Se emplearon para ello, las recomendaciones de la AAPM TG-61 y el IAEA-TRS 398.  Resultados:  lo promedios de las HVLs (mm Al) y sus respectivos coeficientes de variación (CV) fueron de 5,526 - 5,2 %; 1,130 - 2,1 % y 2,007 - 2,1 % para 50,70 y 100 kV respectivamente. Los rendimientos presentaron poca variabilidad entre máquinas (CV &lt; 3%) y fueron muy similares por los métodos &#8220;en agua&#8221; y &#8220;en aire&#8221; (discrepancia. &lt; 0,5 %).  Conclusiones:  los equipos muestran una excelente estabilidad, y características dosimétricas muy similares entre ellos, lo cual permite establecer valores de referencia para eventuales auditorías externas y re-ajustes de los haces ulteriormente a los mantenimientos o reparaciones que impliquen al generador de rayos X.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction:  in Cuba, in 2018, a total of 12 070 new cases of skin cancer were diagnosed, from which it is estimated that 11 587 correspond to the non-melanoma type. Radiation therapy with X-rays is considered the first-line treatment in many of these cases. Recently, the national healthcare system acquired four SENSUS SRT-100TM units for treating Non-Melanoma Skin Cancer (NMSC).  Objective:  to develop a standardized methodology for the dosimetric characterization of the equipments of surface radiotherapy with X-rays installed in Cuba.  Methods:  four SENSUS SRT-100TM radiotherapy equipments were characterized for each of their radiological qualities, in terms of linearity, stability, hemi-reductive layer, reference dose rates, dose profiles, cone factors and percentage of dose in depth. The recommendations of the AAPM TG-61 and the IAEA-TRS 398 were applied for this purpose.  Results:  the averages of HVLs (mm Al) and their respective coefficients of variation (CV) were 5,526 - 5,2 %; 1,130 - 2,1 % and 2,007 - 2,1 % for 50, 70 and 100 kV respectively. The yields presented little variability between machines (CV &lt; 3%) and were very similar by the methods "in water" and "in air" (discrepancy &lt; 0,5 %).  Conclusions:  the equipments show excellent stability and very similar dosimetric characteristics among them, which allows establishing reference values for eventual external audits and beam readjustments after the maintenance or repairs involving the X-ray generator.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Dosimetría]]></kwd>
<kwd lng="es"><![CDATA[Radioterapia]]></kwd>
<kwd lng="es"><![CDATA[Terapia Por Rayos X]]></kwd>
<kwd lng="es"><![CDATA[Neoplasias Cutáneas]]></kwd>
<kwd lng="es"><![CDATA[Calibración]]></kwd>
<kwd lng="en"><![CDATA[Dosimetry]]></kwd>
<kwd lng="en"><![CDATA[Radiotherapy]]></kwd>
<kwd lng="en"><![CDATA[Skin Neoplasms]]></kwd>
<kwd lng="en"><![CDATA[X-Ray Therapy]]></kwd>
<kwd lng="en"><![CDATA[Calibration]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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