Technical Report: Reference photon dosimetry data for Varian accelerators based on IROC-Houston site visit data
Purpose: Accurate data regarding linear accelerator (Linac) radiation characteristics are important for treatment planning system modeling as well as regular quality assurance of the machine. The Imaging and Radiation Oncology Core-Houston (IROC-H) has measured the dosimetric characteristics of nume...
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| Veröffentlicht in: | Medical physics (Lancaster) 2016-05, Vol.43 (5), p.2374-2386 |
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| creator | Kerns, James R. Followill, David S. Lowenstein, Jessica Molineu, Andrea Alvarez, Paola Taylor, Paige A. Stingo, Francesco C. Kry, Stephen F. |
| description | Purpose:
Accurate data regarding linear accelerator (Linac) radiation characteristics are important for treatment planning system modeling as well as regular quality assurance of the machine. The Imaging and Radiation Oncology Core-Houston (IROC-H) has measured the dosimetric characteristics of numerous machines through their on-site dosimetry review protocols. Photon data are presented and can be used as a secondary check of acquired values, as a means to verify commissioning a new machine, or in preparation for an IROC-H site visit.
Methods:
Photon data from IROC-H on-site reviews from 2000 to 2014 were compiled and analyzed. Specifically, data from approximately 500 Varian machines were analyzed. Each dataset consisted of point measurements of several dosimetric parameters at various locations in a water phantom to assess the percentage depth dose, jaw output factors, multileaf collimator small field output factors, off-axis factors, and wedge factors. The data were analyzed by energy and parameter, with similarly performing machine models being assimilated into classes. Common statistical metrics are presented for each machine class. Measurement data were compared against other reference data where applicable.
Results:
Distributions of the parameter data were shown to be robust and derive from a student’s t distribution. Based on statistical and clinical criteria, all machine models were able to be classified into two or three classes for each energy, except for 6 MV for which there were eight classes. Quantitative analysis of the measurements for 6, 10, 15, and 18 MV photon beams is presented for each parameter; supplementary material has also been made available which contains further statistical information.
Conclusions:
IROC-H has collected numerous data on Varian Linacs and the results of photon measurements from the past 15 years are presented. The data can be used as a comparison check of a physicist’s acquired values. Acquired values that are well outside the expected distribution should be verified by the physicist to identify whether the measurements are valid. Comparison of values to this reference data provides a redundant check to help prevent gross dosimetric treatment errors. |
| doi_str_mv | 10.1118/1.4945697 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_pubme</sourceid><recordid>TN_cdi_pubmed_primary_27147349</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1787478390</sourcerecordid><originalsourceid>FETCH-LOGICAL-c5437-8f1d3bb8b4137061b603418cbfb034269ed72929b744d1d1f90a3728c62d9e153</originalsourceid><addsrcrecordid>eNp9kU-LFDEQxYMo7rh68AtIwIsIveZfdzoeBBnUXVhZWVavIZ1UO5GepDfJjMy3N-OMy3rQ0wvUr15eVSH0nJIzSmn_hp4JJdpOyQdowYTkjWBEPUQLQpRomCDtCXqS8w9CSMdb8hidMEkrJtQCxRuwq-CtmfA1zDGVt1VHSBAs4HkVSwzYxezXUNIOO1MMHmPC30zyJmBjLUyQTIkp48FkcLjyF9dXy-Y8bvK-OfsCeOur_O5-ih6NZsrw7Kin6OvHDzfL8-by6tPF8v1lY1vBZdOP1PFh6AdBuSQdHTrCBe3tMA71wToFTjLF1CCFcNTRURHDJettx5wC2vJT9O7gO2-GNTgLoSQz6Tn5tUk7HY3Xf1eCX-nvcatFz7lsWTV4eTCIuXidbR3DrmwMAWzRjHWM9IpW6tXxmxRvN5CLXvtcdzKZAHUBmspeCtlzRSr64n6iuyh_blGB5gD89BPs7uqU6P2RNdXHI-vPX_ZS-dcHfh_OFB_Dv3v-B29jumc-u5H_AqeWtJg</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1787478390</pqid></control><display><type>article</type><title>Technical Report: Reference photon dosimetry data for Varian accelerators based on IROC-Houston site visit data</title><source>MEDLINE</source><source>Wiley Online Library Journals Frontfile Complete</source><source>Alma/SFX Local Collection</source><creator>Kerns, James R. ; Followill, David S. ; Lowenstein, Jessica ; Molineu, Andrea ; Alvarez, Paola ; Taylor, Paige A. ; Stingo, Francesco C. ; Kry, Stephen F.</creator><creatorcontrib>Kerns, James R. ; Followill, David S. ; Lowenstein, Jessica ; Molineu, Andrea ; Alvarez, Paola ; Taylor, Paige A. ; Stingo, Francesco C. ; Kry, Stephen F.</creatorcontrib><description>Purpose:
Accurate data regarding linear accelerator (Linac) radiation characteristics are important for treatment planning system modeling as well as regular quality assurance of the machine. The Imaging and Radiation Oncology Core-Houston (IROC-H) has measured the dosimetric characteristics of numerous machines through their on-site dosimetry review protocols. Photon data are presented and can be used as a secondary check of acquired values, as a means to verify commissioning a new machine, or in preparation for an IROC-H site visit.
Methods:
Photon data from IROC-H on-site reviews from 2000 to 2014 were compiled and analyzed. Specifically, data from approximately 500 Varian machines were analyzed. Each dataset consisted of point measurements of several dosimetric parameters at various locations in a water phantom to assess the percentage depth dose, jaw output factors, multileaf collimator small field output factors, off-axis factors, and wedge factors. The data were analyzed by energy and parameter, with similarly performing machine models being assimilated into classes. Common statistical metrics are presented for each machine class. Measurement data were compared against other reference data where applicable.
Results:
Distributions of the parameter data were shown to be robust and derive from a student’s t distribution. Based on statistical and clinical criteria, all machine models were able to be classified into two or three classes for each energy, except for 6 MV for which there were eight classes. Quantitative analysis of the measurements for 6, 10, 15, and 18 MV photon beams is presented for each parameter; supplementary material has also been made available which contains further statistical information.
Conclusions:
IROC-H has collected numerous data on Varian Linacs and the results of photon measurements from the past 15 years are presented. The data can be used as a comparison check of a physicist’s acquired values. Acquired values that are well outside the expected distribution should be verified by the physicist to identify whether the measurements are valid. Comparison of values to this reference data provides a redundant check to help prevent gross dosimetric treatment errors.</description><identifier>ISSN: 0094-2405</identifier><identifier>EISSN: 2473-4209</identifier><identifier>DOI: 10.1118/1.4945697</identifier><identifier>PMID: 27147349</identifier><identifier>CODEN: MPHYA6</identifier><language>eng</language><publisher>United States: American Association of Physicists in Medicine</publisher><subject>60 APPLIED LIFE SCIENCES ; biomedical equipment ; Biomedical instrumentation and transducers, including micro‐electro‐mechanical systems (MEMS) ; BIOMEDICAL RADIOGRAPHY ; COLLIMATORS ; COMMISSIONING ; COMPUTATIONAL AND EXPERIMENTAL DOSIMETRY ; Computer modeling ; Data analysis ; DATASETS ; DEPTH DOSE DISTRIBUTIONS ; Distribution theory and Monte Carlo studies ; DOSIMETRY ; Dosimetry/exposure assessment ; ERRORS ; Field size ; Intensity modulated radiation therapy ; IROC ; Linac ; LINEAR ACCELERATORS ; Multileaf collimators ; Particle Accelerators - instrumentation ; Particle Accelerators - statistics & numerical data ; percentage depth dose ; PHANTOMS ; PHOTON BEAMS ; Photons ; Physicists ; QUALITY ASSURANCE ; RADIATION PROTECTION AND DOSIMETRY ; radiation therapy ; Radiometry - instrumentation ; Radiometry - statistics & numerical data ; Radiosurgery ; reference data ; Reference Values ; REVIEWS ; Scintigraphy ; small field ; statistical distributions ; Therapeutic applications, including brachytherapy ; Using diaphragms, collimators ; Water</subject><ispartof>Medical physics (Lancaster), 2016-05, Vol.43 (5), p.2374-2386</ispartof><rights>American Association of Physicists in Medicine</rights><rights>2016 American Association of Physicists in Medicine</rights><rights>2016 American Association of Physicists in Medicine. 2016 American Association of Physicists in Medicine</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5437-8f1d3bb8b4137061b603418cbfb034269ed72929b744d1d1f90a3728c62d9e153</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1118%2F1.4945697$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1118%2F1.4945697$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,776,780,881,1411,27903,27904,45553,45554</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27147349$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/22620891$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Kerns, James R.</creatorcontrib><creatorcontrib>Followill, David S.</creatorcontrib><creatorcontrib>Lowenstein, Jessica</creatorcontrib><creatorcontrib>Molineu, Andrea</creatorcontrib><creatorcontrib>Alvarez, Paola</creatorcontrib><creatorcontrib>Taylor, Paige A.</creatorcontrib><creatorcontrib>Stingo, Francesco C.</creatorcontrib><creatorcontrib>Kry, Stephen F.</creatorcontrib><title>Technical Report: Reference photon dosimetry data for Varian accelerators based on IROC-Houston site visit data</title><title>Medical physics (Lancaster)</title><addtitle>Med Phys</addtitle><description>Purpose:
Accurate data regarding linear accelerator (Linac) radiation characteristics are important for treatment planning system modeling as well as regular quality assurance of the machine. The Imaging and Radiation Oncology Core-Houston (IROC-H) has measured the dosimetric characteristics of numerous machines through their on-site dosimetry review protocols. Photon data are presented and can be used as a secondary check of acquired values, as a means to verify commissioning a new machine, or in preparation for an IROC-H site visit.
Methods:
Photon data from IROC-H on-site reviews from 2000 to 2014 were compiled and analyzed. Specifically, data from approximately 500 Varian machines were analyzed. Each dataset consisted of point measurements of several dosimetric parameters at various locations in a water phantom to assess the percentage depth dose, jaw output factors, multileaf collimator small field output factors, off-axis factors, and wedge factors. The data were analyzed by energy and parameter, with similarly performing machine models being assimilated into classes. Common statistical metrics are presented for each machine class. Measurement data were compared against other reference data where applicable.
Results:
Distributions of the parameter data were shown to be robust and derive from a student’s t distribution. Based on statistical and clinical criteria, all machine models were able to be classified into two or three classes for each energy, except for 6 MV for which there were eight classes. Quantitative analysis of the measurements for 6, 10, 15, and 18 MV photon beams is presented for each parameter; supplementary material has also been made available which contains further statistical information.
Conclusions:
IROC-H has collected numerous data on Varian Linacs and the results of photon measurements from the past 15 years are presented. The data can be used as a comparison check of a physicist’s acquired values. Acquired values that are well outside the expected distribution should be verified by the physicist to identify whether the measurements are valid. Comparison of values to this reference data provides a redundant check to help prevent gross dosimetric treatment errors.</description><subject>60 APPLIED LIFE SCIENCES</subject><subject>biomedical equipment</subject><subject>Biomedical instrumentation and transducers, including micro‐electro‐mechanical systems (MEMS)</subject><subject>BIOMEDICAL RADIOGRAPHY</subject><subject>COLLIMATORS</subject><subject>COMMISSIONING</subject><subject>COMPUTATIONAL AND EXPERIMENTAL DOSIMETRY</subject><subject>Computer modeling</subject><subject>Data analysis</subject><subject>DATASETS</subject><subject>DEPTH DOSE DISTRIBUTIONS</subject><subject>Distribution theory and Monte Carlo studies</subject><subject>DOSIMETRY</subject><subject>Dosimetry/exposure assessment</subject><subject>ERRORS</subject><subject>Field size</subject><subject>Intensity modulated radiation therapy</subject><subject>IROC</subject><subject>Linac</subject><subject>LINEAR ACCELERATORS</subject><subject>Multileaf collimators</subject><subject>Particle Accelerators - instrumentation</subject><subject>Particle Accelerators - statistics & numerical data</subject><subject>percentage depth dose</subject><subject>PHANTOMS</subject><subject>PHOTON BEAMS</subject><subject>Photons</subject><subject>Physicists</subject><subject>QUALITY ASSURANCE</subject><subject>RADIATION PROTECTION AND DOSIMETRY</subject><subject>radiation therapy</subject><subject>Radiometry - instrumentation</subject><subject>Radiometry - statistics & numerical data</subject><subject>Radiosurgery</subject><subject>reference data</subject><subject>Reference Values</subject><subject>REVIEWS</subject><subject>Scintigraphy</subject><subject>small field</subject><subject>statistical distributions</subject><subject>Therapeutic applications, including brachytherapy</subject><subject>Using diaphragms, collimators</subject><subject>Water</subject><issn>0094-2405</issn><issn>2473-4209</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kU-LFDEQxYMo7rh68AtIwIsIveZfdzoeBBnUXVhZWVavIZ1UO5GepDfJjMy3N-OMy3rQ0wvUr15eVSH0nJIzSmn_hp4JJdpOyQdowYTkjWBEPUQLQpRomCDtCXqS8w9CSMdb8hidMEkrJtQCxRuwq-CtmfA1zDGVt1VHSBAs4HkVSwzYxezXUNIOO1MMHmPC30zyJmBjLUyQTIkp48FkcLjyF9dXy-Y8bvK-OfsCeOur_O5-ih6NZsrw7Kin6OvHDzfL8-by6tPF8v1lY1vBZdOP1PFh6AdBuSQdHTrCBe3tMA71wToFTjLF1CCFcNTRURHDJettx5wC2vJT9O7gO2-GNTgLoSQz6Tn5tUk7HY3Xf1eCX-nvcatFz7lsWTV4eTCIuXidbR3DrmwMAWzRjHWM9IpW6tXxmxRvN5CLXvtcdzKZAHUBmspeCtlzRSr64n6iuyh_blGB5gD89BPs7uqU6P2RNdXHI-vPX_ZS-dcHfh_OFB_Dv3v-B29jumc-u5H_AqeWtJg</recordid><startdate>201605</startdate><enddate>201605</enddate><creator>Kerns, James R.</creator><creator>Followill, David S.</creator><creator>Lowenstein, Jessica</creator><creator>Molineu, Andrea</creator><creator>Alvarez, Paola</creator><creator>Taylor, Paige A.</creator><creator>Stingo, Francesco C.</creator><creator>Kry, Stephen F.</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><scope>5PM</scope></search><sort><creationdate>201605</creationdate><title>Technical Report: Reference photon dosimetry data for Varian accelerators based on IROC-Houston site visit data</title><author>Kerns, James R. ; Followill, David S. ; Lowenstein, Jessica ; Molineu, Andrea ; Alvarez, Paola ; Taylor, Paige A. ; Stingo, Francesco C. ; Kry, Stephen F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5437-8f1d3bb8b4137061b603418cbfb034269ed72929b744d1d1f90a3728c62d9e153</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>60 APPLIED LIFE SCIENCES</topic><topic>biomedical equipment</topic><topic>Biomedical instrumentation and transducers, including micro‐electro‐mechanical systems (MEMS)</topic><topic>BIOMEDICAL RADIOGRAPHY</topic><topic>COLLIMATORS</topic><topic>COMMISSIONING</topic><topic>COMPUTATIONAL AND EXPERIMENTAL DOSIMETRY</topic><topic>Computer modeling</topic><topic>Data analysis</topic><topic>DATASETS</topic><topic>DEPTH DOSE DISTRIBUTIONS</topic><topic>Distribution theory and Monte Carlo studies</topic><topic>DOSIMETRY</topic><topic>Dosimetry/exposure assessment</topic><topic>ERRORS</topic><topic>Field size</topic><topic>Intensity modulated radiation therapy</topic><topic>IROC</topic><topic>Linac</topic><topic>LINEAR ACCELERATORS</topic><topic>Multileaf collimators</topic><topic>Particle Accelerators - instrumentation</topic><topic>Particle Accelerators - statistics & numerical data</topic><topic>percentage depth dose</topic><topic>PHANTOMS</topic><topic>PHOTON BEAMS</topic><topic>Photons</topic><topic>Physicists</topic><topic>QUALITY ASSURANCE</topic><topic>RADIATION PROTECTION AND DOSIMETRY</topic><topic>radiation therapy</topic><topic>Radiometry - instrumentation</topic><topic>Radiometry - statistics & numerical data</topic><topic>Radiosurgery</topic><topic>reference data</topic><topic>Reference Values</topic><topic>REVIEWS</topic><topic>Scintigraphy</topic><topic>small field</topic><topic>statistical distributions</topic><topic>Therapeutic applications, including brachytherapy</topic><topic>Using diaphragms, collimators</topic><topic>Water</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kerns, James R.</creatorcontrib><creatorcontrib>Followill, David S.</creatorcontrib><creatorcontrib>Lowenstein, Jessica</creatorcontrib><creatorcontrib>Molineu, Andrea</creatorcontrib><creatorcontrib>Alvarez, Paola</creatorcontrib><creatorcontrib>Taylor, Paige A.</creatorcontrib><creatorcontrib>Stingo, Francesco C.</creatorcontrib><creatorcontrib>Kry, Stephen F.</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><collection>PubMed Central (Full Participant titles)</collection><jtitle>Medical physics (Lancaster)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kerns, James R.</au><au>Followill, David S.</au><au>Lowenstein, Jessica</au><au>Molineu, Andrea</au><au>Alvarez, Paola</au><au>Taylor, Paige A.</au><au>Stingo, Francesco C.</au><au>Kry, Stephen F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Technical Report: Reference photon dosimetry data for Varian accelerators based on IROC-Houston site visit data</atitle><jtitle>Medical physics (Lancaster)</jtitle><addtitle>Med Phys</addtitle><date>2016-05</date><risdate>2016</risdate><volume>43</volume><issue>5</issue><spage>2374</spage><epage>2386</epage><pages>2374-2386</pages><issn>0094-2405</issn><eissn>2473-4209</eissn><coden>MPHYA6</coden><abstract>Purpose:
Accurate data regarding linear accelerator (Linac) radiation characteristics are important for treatment planning system modeling as well as regular quality assurance of the machine. The Imaging and Radiation Oncology Core-Houston (IROC-H) has measured the dosimetric characteristics of numerous machines through their on-site dosimetry review protocols. Photon data are presented and can be used as a secondary check of acquired values, as a means to verify commissioning a new machine, or in preparation for an IROC-H site visit.
Methods:
Photon data from IROC-H on-site reviews from 2000 to 2014 were compiled and analyzed. Specifically, data from approximately 500 Varian machines were analyzed. Each dataset consisted of point measurements of several dosimetric parameters at various locations in a water phantom to assess the percentage depth dose, jaw output factors, multileaf collimator small field output factors, off-axis factors, and wedge factors. The data were analyzed by energy and parameter, with similarly performing machine models being assimilated into classes. Common statistical metrics are presented for each machine class. Measurement data were compared against other reference data where applicable.
Results:
Distributions of the parameter data were shown to be robust and derive from a student’s t distribution. Based on statistical and clinical criteria, all machine models were able to be classified into two or three classes for each energy, except for 6 MV for which there were eight classes. Quantitative analysis of the measurements for 6, 10, 15, and 18 MV photon beams is presented for each parameter; supplementary material has also been made available which contains further statistical information.
Conclusions:
IROC-H has collected numerous data on Varian Linacs and the results of photon measurements from the past 15 years are presented. The data can be used as a comparison check of a physicist’s acquired values. Acquired values that are well outside the expected distribution should be verified by the physicist to identify whether the measurements are valid. Comparison of values to this reference data provides a redundant check to help prevent gross dosimetric treatment errors.</abstract><cop>United States</cop><pub>American Association of Physicists in Medicine</pub><pmid>27147349</pmid><doi>10.1118/1.4945697</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Medical physics (Lancaster), 2016-05, Vol.43 (5), p.2374-2386 |
| issn | 0094-2405 2473-4209 |
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| source | MEDLINE; Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | 60 APPLIED LIFE SCIENCES biomedical equipment Biomedical instrumentation and transducers, including micro‐electro‐mechanical systems (MEMS) BIOMEDICAL RADIOGRAPHY COLLIMATORS COMMISSIONING COMPUTATIONAL AND EXPERIMENTAL DOSIMETRY Computer modeling Data analysis DATASETS DEPTH DOSE DISTRIBUTIONS Distribution theory and Monte Carlo studies DOSIMETRY Dosimetry/exposure assessment ERRORS Field size Intensity modulated radiation therapy IROC Linac LINEAR ACCELERATORS Multileaf collimators Particle Accelerators - instrumentation Particle Accelerators - statistics & numerical data percentage depth dose PHANTOMS PHOTON BEAMS Photons Physicists QUALITY ASSURANCE RADIATION PROTECTION AND DOSIMETRY radiation therapy Radiometry - instrumentation Radiometry - statistics & numerical data Radiosurgery reference data Reference Values REVIEWS Scintigraphy small field statistical distributions Therapeutic applications, including brachytherapy Using diaphragms, collimators Water |
| title | Technical Report: Reference photon dosimetry data for Varian accelerators based on IROC-Houston site visit data |
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