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Comparison of ghosting effects for three commercial a - Si EPIDs
Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU)...
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| Published in: | Medical physics (Lancaster) 2006-07, Vol.33 (7), p.2448-2451 |
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| container_end_page | 2451 |
| container_issue | 7 |
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| container_title | Medical physics (Lancaster) |
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| creator | McDermott, L. N. Nijsten, S. M. J. J. G. Sonke, J.-J. Partridge, M. van Herk, M. Mijnheer, B. J. |
| description | Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5–1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of
1000
MUs
. This under-response is consistent with ghosting effects due to charge trapping. |
| doi_str_mv | 10.1118/1.2207318 |
| format | article |
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1000
MUs
. This under-response is consistent with ghosting effects due to charge trapping.</description><identifier>ISSN: 0094-2405</identifier><identifier>EISSN: 2473-4209</identifier><identifier>DOI: 10.1118/1.2207318</identifier><identifier>PMID: 16898447</identifier><identifier>CODEN: MPHYA6</identifier><language>eng</language><publisher>United States: American Association of Physicists in Medicine</publisher><subject>amorphous semiconductors ; amorphous silicon ; BEAMS ; biomedical equipment ; Calibration ; Digital image processing ; DOSE RATES ; dose response ; DOSIMETRY ; Elastic moduli ; EPID dosimetry ; Equipment Design ; ghosting ; Humans ; Image guided radiation therapy ; image lag ; IMAGE PROCESSING ; Image Processing, Computer-Assisted - methods ; Image sensors ; Linear accelerators ; Medical imaging ; Particle beam detectors ; Phantoms, Imaging ; Photodiodes ; radiation therapy ; Radiation therapy equipment ; Radiographic Image Interpretation, Computer-Assisted ; RADIOLOGY AND NUCLEAR MEDICINE ; Radiometry - methods ; RADIOTHERAPY ; Radiotherapy Dosage ; Record and verify systems and applications ; Reproducibility of Results ; SEMICONDUCTOR MATERIALS ; SIGNALS ; SILICON ; Silicon - chemistry ; Software ; Time Factors ; Verification</subject><ispartof>Medical physics (Lancaster), 2006-07, Vol.33 (7), p.2448-2451</ispartof><rights>American Association of Physicists in Medicine</rights><rights>2006 American Association of Physicists in Medicine</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-o4008-67c8648561cb3d5dc277caeb1270cb478da08fc8fd5496e497bf25b1a1e571603</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/16898447$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/20853219$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>McDermott, L. N.</creatorcontrib><creatorcontrib>Nijsten, S. M. J. J. G.</creatorcontrib><creatorcontrib>Sonke, J.-J.</creatorcontrib><creatorcontrib>Partridge, M.</creatorcontrib><creatorcontrib>van Herk, M.</creatorcontrib><creatorcontrib>Mijnheer, B. J.</creatorcontrib><title>Comparison of ghosting effects for three commercial a - Si EPIDs</title><title>Medical physics (Lancaster)</title><addtitle>Med Phys</addtitle><description>Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5–1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of
1000
MUs
. This under-response is consistent with ghosting effects due to charge trapping.</description><subject>amorphous semiconductors</subject><subject>amorphous silicon</subject><subject>BEAMS</subject><subject>biomedical equipment</subject><subject>Calibration</subject><subject>Digital image processing</subject><subject>DOSE RATES</subject><subject>dose response</subject><subject>DOSIMETRY</subject><subject>Elastic moduli</subject><subject>EPID dosimetry</subject><subject>Equipment Design</subject><subject>ghosting</subject><subject>Humans</subject><subject>Image guided radiation therapy</subject><subject>image lag</subject><subject>IMAGE PROCESSING</subject><subject>Image Processing, Computer-Assisted - methods</subject><subject>Image sensors</subject><subject>Linear accelerators</subject><subject>Medical imaging</subject><subject>Particle beam detectors</subject><subject>Phantoms, Imaging</subject><subject>Photodiodes</subject><subject>radiation therapy</subject><subject>Radiation therapy equipment</subject><subject>Radiographic Image Interpretation, Computer-Assisted</subject><subject>RADIOLOGY AND NUCLEAR MEDICINE</subject><subject>Radiometry - methods</subject><subject>RADIOTHERAPY</subject><subject>Radiotherapy Dosage</subject><subject>Record and verify systems and applications</subject><subject>Reproducibility of Results</subject><subject>SEMICONDUCTOR MATERIALS</subject><subject>SIGNALS</subject><subject>SILICON</subject><subject>Silicon - chemistry</subject><subject>Software</subject><subject>Time Factors</subject><subject>Verification</subject><issn>0094-2405</issn><issn>2473-4209</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqNkM9LwzAYhoMobv44-A9IQPAgdH5J0ya9iDKnDhQF9RzSNNkibTObTvG_t6MTvSie3sP3fC8vD0IHBEaEEHFKRpQCj4nYQEPKeBwxCtkmGgJkLKIMkgHaCeEFANI4gW00IKnIBGN8iM7HvlqoxgVfY2_xbO5D6-oZNtYa3QZsfYPbeWMM1r6qTKOdKrHCEX50ePIwvQx7aMuqMpj9de6i56vJ0_gmur2_no4vbiPPAESUci1SJpKU6DwukkJTzrUyOaEcdM64KBQIq4UtEpalhmU8tzTJiSIm4SSFeBcd9b2rgTJo1xo9176uu5mSgkhiSrKOOu6pReNflya0snJBm7JUtfHLIFPBacYJ6cDDNbjMK1PIReMq1XzILzMdEPXAuyvNx_cd5Eq5JHKtXN49rKLjz3p-NU21zte__3w7l97K3nlXcPLvgr_gN9_8WLcobPwJI2Cg3g</recordid><startdate>200607</startdate><enddate>200607</enddate><creator>McDermott, L. N.</creator><creator>Nijsten, S. M. J. J. G.</creator><creator>Sonke, J.-J.</creator><creator>Partridge, M.</creator><creator>van Herk, M.</creator><creator>Mijnheer, B. J.</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>7X8</scope><scope>OTOTI</scope></search><sort><creationdate>200607</creationdate><title>Comparison of ghosting effects for three commercial a - Si EPIDs</title><author>McDermott, L. N. ; Nijsten, S. M. J. J. G. ; Sonke, J.-J. ; Partridge, M. ; van Herk, M. ; Mijnheer, B. 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N.</creatorcontrib><creatorcontrib>Nijsten, S. M. J. J. G.</creatorcontrib><creatorcontrib>Sonke, J.-J.</creatorcontrib><creatorcontrib>Partridge, M.</creatorcontrib><creatorcontrib>van Herk, M.</creatorcontrib><creatorcontrib>Mijnheer, B. J.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>MEDLINE - Academic</collection><collection>OSTI.GOV</collection><jtitle>Medical physics (Lancaster)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>McDermott, L. N.</au><au>Nijsten, S. M. J. J. G.</au><au>Sonke, J.-J.</au><au>Partridge, M.</au><au>van Herk, M.</au><au>Mijnheer, B. J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of ghosting effects for three commercial a - Si EPIDs</atitle><jtitle>Medical physics (Lancaster)</jtitle><addtitle>Med Phys</addtitle><date>2006-07</date><risdate>2006</risdate><volume>33</volume><issue>7</issue><spage>2448</spage><epage>2451</epage><pages>2448-2451</pages><issn>0094-2405</issn><eissn>2473-4209</eissn><coden>MPHYA6</coden><abstract>Many studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5–1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of
1000
MUs
. This under-response is consistent with ghosting effects due to charge trapping.</abstract><cop>United States</cop><pub>American Association of Physicists in Medicine</pub><pmid>16898447</pmid><doi>10.1118/1.2207318</doi><tpages>4</tpages></addata></record> |
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| source | Wiley-Blackwell Read & Publish Collection |
| subjects | amorphous semiconductors amorphous silicon BEAMS biomedical equipment Calibration Digital image processing DOSE RATES dose response DOSIMETRY Elastic moduli EPID dosimetry Equipment Design ghosting Humans Image guided radiation therapy image lag IMAGE PROCESSING Image Processing, Computer-Assisted - methods Image sensors Linear accelerators Medical imaging Particle beam detectors Phantoms, Imaging Photodiodes radiation therapy Radiation therapy equipment Radiographic Image Interpretation, Computer-Assisted RADIOLOGY AND NUCLEAR MEDICINE Radiometry - methods RADIOTHERAPY Radiotherapy Dosage Record and verify systems and applications Reproducibility of Results SEMICONDUCTOR MATERIALS SIGNALS SILICON Silicon - chemistry Software Time Factors Verification |
| title | Comparison of ghosting effects for three commercial a - Si EPIDs |
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