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An investigation of a new amorphous silicon electronic portal imaging device for transit dosimetry
The relationship between the pixel value and exit dose was investigated for a new commercially available amorphous silicon electronic portal imaging device. The pixel to dose mapping function was established to be linear for detector distances between 116.5 cm to 150 cm from the source, radiation fi...
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Published in: | Medical physics (Lancaster) 2002-10, Vol.29 (10), p.2262-2268 |
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container_title | Medical physics (Lancaster) |
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creator | Grein, Ellen E. Lee, Richard Luchka, Kurt |
description | The relationship between the pixel value and exit dose was investigated for a new commercially available amorphous silicon electronic portal imaging device. The pixel to dose mapping function was established to be linear for detector distances between 116.5 cm to 150 cm from the source, radiation field sizes from
5×5
cm
2
to
20×20
cm
2
and beam energies of 6 to 18 MV. Coefficients in the mapping function were found to be dependent on beam energy and field size. Open and wedged field profiles measured with the device showed agreement to a maximum of 5% and 8%, respectively, as compared to film. A comparison of relative transmission measurements between the EPID and ion chamber indicate a maximum deviation of 6% and 2% at 6 and 18 MV, respectively, for an attenuator thickness of 21 cm and SDD⩾130 cm. It was found that accuracies of better than 1% could be obtained if detector position and field size specific fitting parameters were used to generate unique mapping functions for each configuration. |
doi_str_mv | 10.1118/1.1508108 |
format | article |
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5×5
cm
2
to
20×20
cm
2
and beam energies of 6 to 18 MV. Coefficients in the mapping function were found to be dependent on beam energy and field size. Open and wedged field profiles measured with the device showed agreement to a maximum of 5% and 8%, respectively, as compared to film. A comparison of relative transmission measurements between the EPID and ion chamber indicate a maximum deviation of 6% and 2% at 6 and 18 MV, respectively, for an attenuator thickness of 21 cm and SDD⩾130 cm. It was found that accuracies of better than 1% could be obtained if detector position and field size specific fitting parameters were used to generate unique mapping functions for each configuration.</description><identifier>ISSN: 0094-2405</identifier><identifier>EISSN: 2473-4209</identifier><identifier>DOI: 10.1118/1.1508108</identifier><identifier>PMID: 12408300</identifier><identifier>CODEN: MPHYA6</identifier><language>eng</language><publisher>United States: American Association of Physicists in Medicine</publisher><subject>amorphous semiconductors ; biomedical electronics ; biomedical imaging ; dosimetry ; Electromagnetic radiation detectors ; Field size ; Image guided radiation therapy ; Models, Statistical ; Particle beam detectors ; Phantoms, Imaging ; Photons ; Quality assurance equipment ; Radiation Oncology - instrumentation ; radiation therapy ; Radiation therapy equipment ; Radiometry - instrumentation ; Radiometry - methods ; Radiotherapy Dosage ; Radiotherapy Planning, Computer-Assisted ; Radiotherapy sources ; Radiotherapy, High-Energy ; Silicon ; Thin film devices ; Transmission measurement ; Verification</subject><ispartof>Medical physics (Lancaster), 2002-10, Vol.29 (10), p.2262-2268</ispartof><rights>American Association of Physicists in Medicine</rights><rights>2002 American Association of Physicists in Medicine</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3898-428e9f81efa76c10cad964173c8889a6da642bb6296a706e6570e9c37bb4948c3</citedby><cites>FETCH-LOGICAL-c3898-428e9f81efa76c10cad964173c8889a6da642bb6296a706e6570e9c37bb4948c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12408300$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Grein, Ellen E.</creatorcontrib><creatorcontrib>Lee, Richard</creatorcontrib><creatorcontrib>Luchka, Kurt</creatorcontrib><title>An investigation of a new amorphous silicon electronic portal imaging device for transit dosimetry</title><title>Medical physics (Lancaster)</title><addtitle>Med Phys</addtitle><description>The relationship between the pixel value and exit dose was investigated for a new commercially available amorphous silicon electronic portal imaging device. The pixel to dose mapping function was established to be linear for detector distances between 116.5 cm to 150 cm from the source, radiation field sizes from
5×5
cm
2
to
20×20
cm
2
and beam energies of 6 to 18 MV. Coefficients in the mapping function were found to be dependent on beam energy and field size. Open and wedged field profiles measured with the device showed agreement to a maximum of 5% and 8%, respectively, as compared to film. A comparison of relative transmission measurements between the EPID and ion chamber indicate a maximum deviation of 6% and 2% at 6 and 18 MV, respectively, for an attenuator thickness of 21 cm and SDD⩾130 cm. It was found that accuracies of better than 1% could be obtained if detector position and field size specific fitting parameters were used to generate unique mapping functions for each configuration.</description><subject>amorphous semiconductors</subject><subject>biomedical electronics</subject><subject>biomedical imaging</subject><subject>dosimetry</subject><subject>Electromagnetic radiation detectors</subject><subject>Field size</subject><subject>Image guided radiation therapy</subject><subject>Models, Statistical</subject><subject>Particle beam detectors</subject><subject>Phantoms, Imaging</subject><subject>Photons</subject><subject>Quality assurance equipment</subject><subject>Radiation Oncology - instrumentation</subject><subject>radiation therapy</subject><subject>Radiation therapy equipment</subject><subject>Radiometry - instrumentation</subject><subject>Radiometry - methods</subject><subject>Radiotherapy Dosage</subject><subject>Radiotherapy Planning, Computer-Assisted</subject><subject>Radiotherapy sources</subject><subject>Radiotherapy, High-Energy</subject><subject>Silicon</subject><subject>Thin film devices</subject><subject>Transmission measurement</subject><subject>Verification</subject><issn>0094-2405</issn><issn>2473-4209</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LxDAQhoMo7vpx8A9IToJCddJ00-Qo4hcoetBzSdPpGmmbmnRX9t8b3YJe1lNg8vDMvC8hRwzOGWPygp2zGUgGcotM0yznSZaC2iZTAJUlaQazCdkL4R0ABJ_BLpmwOJQcYErKy47abolhsHM9WNdRV1NNO_ykunW-f3OLQINtrIlf2KAZvOusob3zg26obfXcdnNa4dIapLXzdPC6C3aglQu2xcGvDshOrZuAh-O7T15vrl-u7pKHp9v7q8uHxHCpZLxZoqolw1rnwjAwulIiYzk3UkqlRaVFlpalSJXQOQgUsxxQGZ6XZaYyafg-OVl7e-8-FjFR0dpgsGl0hzFFkaeC55KJCJ6uQeNdCB7rovcxiF8VDIrvQgtWjIVG9niULsoWq19ybDACyRr4tA2uNpuKx-dReLbmg7HDT-P_bt8IL53_I--rmn8BViaaaw</recordid><startdate>200210</startdate><enddate>200210</enddate><creator>Grein, Ellen E.</creator><creator>Lee, Richard</creator><creator>Luchka, Kurt</creator><general>American Association of Physicists in Medicine</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>200210</creationdate><title>An investigation of a new amorphous silicon electronic portal imaging device for transit dosimetry</title><author>Grein, Ellen E. ; Lee, Richard ; Luchka, Kurt</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3898-428e9f81efa76c10cad964173c8889a6da642bb6296a706e6570e9c37bb4948c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>amorphous semiconductors</topic><topic>biomedical electronics</topic><topic>biomedical imaging</topic><topic>dosimetry</topic><topic>Electromagnetic radiation detectors</topic><topic>Field size</topic><topic>Image guided radiation therapy</topic><topic>Models, Statistical</topic><topic>Particle beam detectors</topic><topic>Phantoms, Imaging</topic><topic>Photons</topic><topic>Quality assurance equipment</topic><topic>Radiation Oncology - instrumentation</topic><topic>radiation therapy</topic><topic>Radiation therapy equipment</topic><topic>Radiometry - instrumentation</topic><topic>Radiometry - methods</topic><topic>Radiotherapy Dosage</topic><topic>Radiotherapy Planning, Computer-Assisted</topic><topic>Radiotherapy sources</topic><topic>Radiotherapy, High-Energy</topic><topic>Silicon</topic><topic>Thin film devices</topic><topic>Transmission measurement</topic><topic>Verification</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Grein, Ellen E.</creatorcontrib><creatorcontrib>Lee, Richard</creatorcontrib><creatorcontrib>Luchka, Kurt</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Medical physics (Lancaster)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Grein, Ellen E.</au><au>Lee, Richard</au><au>Luchka, Kurt</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An investigation of a new amorphous silicon electronic portal imaging device for transit dosimetry</atitle><jtitle>Medical physics (Lancaster)</jtitle><addtitle>Med Phys</addtitle><date>2002-10</date><risdate>2002</risdate><volume>29</volume><issue>10</issue><spage>2262</spage><epage>2268</epage><pages>2262-2268</pages><issn>0094-2405</issn><eissn>2473-4209</eissn><coden>MPHYA6</coden><abstract>The relationship between the pixel value and exit dose was investigated for a new commercially available amorphous silicon electronic portal imaging device. The pixel to dose mapping function was established to be linear for detector distances between 116.5 cm to 150 cm from the source, radiation field sizes from
5×5
cm
2
to
20×20
cm
2
and beam energies of 6 to 18 MV. Coefficients in the mapping function were found to be dependent on beam energy and field size. Open and wedged field profiles measured with the device showed agreement to a maximum of 5% and 8%, respectively, as compared to film. A comparison of relative transmission measurements between the EPID and ion chamber indicate a maximum deviation of 6% and 2% at 6 and 18 MV, respectively, for an attenuator thickness of 21 cm and SDD⩾130 cm. It was found that accuracies of better than 1% could be obtained if detector position and field size specific fitting parameters were used to generate unique mapping functions for each configuration.</abstract><cop>United States</cop><pub>American Association of Physicists in Medicine</pub><pmid>12408300</pmid><doi>10.1118/1.1508108</doi><tpages>7</tpages></addata></record> |
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subjects | amorphous semiconductors biomedical electronics biomedical imaging dosimetry Electromagnetic radiation detectors Field size Image guided radiation therapy Models, Statistical Particle beam detectors Phantoms, Imaging Photons Quality assurance equipment Radiation Oncology - instrumentation radiation therapy Radiation therapy equipment Radiometry - instrumentation Radiometry - methods Radiotherapy Dosage Radiotherapy Planning, Computer-Assisted Radiotherapy sources Radiotherapy, High-Energy Silicon Thin film devices Transmission measurement Verification |
title | An investigation of a new amorphous silicon electronic portal imaging device for transit dosimetry |
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