Quality assurance and independent dosimetry for an intraoperative x-ray device
Purpose: Quality assurance is an essential component of accurate and safe radiotherapy delivery, and should include measurements which are independent of manufacturer-provided calibration. However, the physical and dosimetric properties of the INTRABEAM compact mobile 50 kV x-ray source are differen...
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| Veröffentlicht in: | Medical Physics 2012-11, Vol.39 (11), p.6908-6920 |
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| creator | Eaton, D. J. |
| description | Purpose:
Quality assurance is an essential component of accurate and safe radiotherapy delivery, and should include measurements which are independent of manufacturer-provided calibration. However, the physical and dosimetric properties of the INTRABEAM compact mobile 50 kV x-ray source are different from conventional kilovoltage therapy units and few reports describe methods for independent checks, frequencies, or tolerances for quality assurance tests.
Methods:
Based on the available evidence and local experience, methods are described for determination of the key dosimetric parameters: beam quality, output, isotropy, and depth doses. Internal system checks are also described, along with measurements of long-term stability.
Results:
A small volume parallel plate ionization chamber in a liquid water tank is the gold standard for measurements with this unit, but solid water-equivalent materials, thermoluminescent dosimeters and radiochromic film can all be used as practical alternatives with an accuracy of 5%–10%. The main cause of measurement uncertainty is positioning of the detector in the steep dose gradient, but energy dependence should also be considered.
Conclusions:
A quality assurance schedule with suggested tolerances is proposed, which includes both internal tests, before each treatment and on a monthly basis, and independent tests every year or after servicing or recalibration. |
| doi_str_mv | 10.1118/1.4761865 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_wiley</sourceid><recordid>TN_cdi_wiley_primary_10_1118_1_4761865_MP1865</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1141535946</sourcerecordid><originalsourceid>FETCH-LOGICAL-c4215-82390671fa0064ebbb83b95730a6cd629b5db4c234f69eeb4f82ab95b7876023</originalsourceid><addsrcrecordid>eNp90F1L3TAYB_AgjnnmvPALSGE3blCX97aXIm4TfAXvQ5I-ZZGepkvSo_32i_RMBqI3yUV--fM8f4QOCT4hhNTfyQmvJKml2EEryitWcoqbXbTCuOEl5VjsoU8xPmCMJRP4I9qjjNAK13yFru8m3bs0FzrGKejBQqGHtnBDCyPkY0hF66NbQwpz0fmQX_NjCtqPEHRyGyieyqDnooWNs_AZfeh0H-Fge--j-x_n92e_ysubnxdnp5el5ZSIsqaswbIinc4jcTDG1Mw0omJYS9tK2hjRGm4p451sAAzvaqozMFVdSUzZPvqyxPqYnIrWJbC_rR8GsEnRvHyDa5HV8aLG4P9MEJNau2ih7_UAfoqKEE4EEw2XmX5dqA0-xgCdGoNb6zArgtVzx4qobcfZHm1jJ7OG9kX-KzWDcgGProf57SR1dbsN_Lb450Vyp354-bPx4T8_tt17-PWofwEI358Y</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1141535946</pqid></control><display><type>article</type><title>Quality assurance and independent dosimetry for an intraoperative x-ray device</title><source>MEDLINE</source><source>Access via Wiley Online Library</source><source>Alma/SFX Local Collection</source><creator>Eaton, D. J.</creator><creatorcontrib>Eaton, D. J.</creatorcontrib><description>Purpose:
Quality assurance is an essential component of accurate and safe radiotherapy delivery, and should include measurements which are independent of manufacturer-provided calibration. However, the physical and dosimetric properties of the INTRABEAM compact mobile 50 kV x-ray source are different from conventional kilovoltage therapy units and few reports describe methods for independent checks, frequencies, or tolerances for quality assurance tests.
Methods:
Based on the available evidence and local experience, methods are described for determination of the key dosimetric parameters: beam quality, output, isotropy, and depth doses. Internal system checks are also described, along with measurements of long-term stability.
Results:
A small volume parallel plate ionization chamber in a liquid water tank is the gold standard for measurements with this unit, but solid water-equivalent materials, thermoluminescent dosimeters and radiochromic film can all be used as practical alternatives with an accuracy of 5%–10%. The main cause of measurement uncertainty is positioning of the detector in the steep dose gradient, but energy dependence should also be considered.
Conclusions:
A quality assurance schedule with suggested tolerances is proposed, which includes both internal tests, before each treatment and on a monthly basis, and independent tests every year or after servicing or recalibration.</description><identifier>ISSN: 0094-2405</identifier><identifier>EISSN: 2473-4209</identifier><identifier>DOI: 10.1118/1.4761865</identifier><identifier>PMID: 23127084</identifier><identifier>CODEN: MPHYA6</identifier><language>eng</language><publisher>United States: American Association of Physicists in Medicine</publisher><subject>60 APPLIED LIFE SCIENCES ; ACCURACY ; Annealing ; BRACHYTHERAPY ; Calibrating of instruments or apparatus ; CALIBRATION ; DEPTH DOSE DISTRIBUTIONS ; Dose‐volume analysis ; Dosimeters ; DOSIMETRY ; Dosimetry/exposure assessment ; Electric measurements ; electronic brachytherapy ; ENERGY DEPENDENCE ; Error analysis ; Film Dosimetry ; INTRABEAM ; Intraoperative Period ; intraoperative radiotherapy ; ionisation chambers ; IONIZATION CHAMBERS ; Linear accelerators ; Monte Carlo Method ; QUALITY ASSURANCE ; Quality Control ; RADIATION DOSES ; RADIATION PROTECTION AND DOSIMETRY ; radiation therapy ; RADIOLOGY AND NUCLEAR MEDICINE ; Radiometry - instrumentation ; Standards and calibration ; Testing or calibrating of apparatus or arrangements provided for in groups G01D1/00 to G01D15/00 ; Therapeutic applications, including brachytherapy ; THERMOLUMINESCENT DOSEMETERS ; thermoluminescent dosimeters ; Thermoluminescent Dosimetry ; Tissues ; Uncertainty ; WATER ; X RADIATION ; X-RAY SOURCES ; X-Rays ; X‐ray scattering</subject><ispartof>Medical Physics, 2012-11, Vol.39 (11), p.6908-6920</ispartof><rights>American Association of Physicists in Medicine</rights><rights>2012 American Association of Physicists in Medicine</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4215-82390671fa0064ebbb83b95730a6cd629b5db4c234f69eeb4f82ab95b7876023</citedby><cites>FETCH-LOGICAL-c4215-82390671fa0064ebbb83b95730a6cd629b5db4c234f69eeb4f82ab95b7876023</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1118%2F1.4761865$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1118%2F1.4761865$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,313,314,780,784,792,885,1417,27922,27924,27925,45574,45575</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/23127084$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/22099085$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Eaton, D. J.</creatorcontrib><title>Quality assurance and independent dosimetry for an intraoperative x-ray device</title><title>Medical Physics</title><addtitle>Med Phys</addtitle><description>Purpose:
Quality assurance is an essential component of accurate and safe radiotherapy delivery, and should include measurements which are independent of manufacturer-provided calibration. However, the physical and dosimetric properties of the INTRABEAM compact mobile 50 kV x-ray source are different from conventional kilovoltage therapy units and few reports describe methods for independent checks, frequencies, or tolerances for quality assurance tests.
Methods:
Based on the available evidence and local experience, methods are described for determination of the key dosimetric parameters: beam quality, output, isotropy, and depth doses. Internal system checks are also described, along with measurements of long-term stability.
Results:
A small volume parallel plate ionization chamber in a liquid water tank is the gold standard for measurements with this unit, but solid water-equivalent materials, thermoluminescent dosimeters and radiochromic film can all be used as practical alternatives with an accuracy of 5%–10%. The main cause of measurement uncertainty is positioning of the detector in the steep dose gradient, but energy dependence should also be considered.
Conclusions:
A quality assurance schedule with suggested tolerances is proposed, which includes both internal tests, before each treatment and on a monthly basis, and independent tests every year or after servicing or recalibration.</description><subject>60 APPLIED LIFE SCIENCES</subject><subject>ACCURACY</subject><subject>Annealing</subject><subject>BRACHYTHERAPY</subject><subject>Calibrating of instruments or apparatus</subject><subject>CALIBRATION</subject><subject>DEPTH DOSE DISTRIBUTIONS</subject><subject>Dose‐volume analysis</subject><subject>Dosimeters</subject><subject>DOSIMETRY</subject><subject>Dosimetry/exposure assessment</subject><subject>Electric measurements</subject><subject>electronic brachytherapy</subject><subject>ENERGY DEPENDENCE</subject><subject>Error analysis</subject><subject>Film Dosimetry</subject><subject>INTRABEAM</subject><subject>Intraoperative Period</subject><subject>intraoperative radiotherapy</subject><subject>ionisation chambers</subject><subject>IONIZATION CHAMBERS</subject><subject>Linear accelerators</subject><subject>Monte Carlo Method</subject><subject>QUALITY ASSURANCE</subject><subject>Quality Control</subject><subject>RADIATION DOSES</subject><subject>RADIATION PROTECTION AND DOSIMETRY</subject><subject>radiation therapy</subject><subject>RADIOLOGY AND NUCLEAR MEDICINE</subject><subject>Radiometry - instrumentation</subject><subject>Standards and calibration</subject><subject>Testing or calibrating of apparatus or arrangements provided for in groups G01D1/00 to G01D15/00</subject><subject>Therapeutic applications, including brachytherapy</subject><subject>THERMOLUMINESCENT DOSEMETERS</subject><subject>thermoluminescent dosimeters</subject><subject>Thermoluminescent Dosimetry</subject><subject>Tissues</subject><subject>Uncertainty</subject><subject>WATER</subject><subject>X RADIATION</subject><subject>X-RAY SOURCES</subject><subject>X-Rays</subject><subject>X‐ray scattering</subject><issn>0094-2405</issn><issn>2473-4209</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp90F1L3TAYB_AgjnnmvPALSGE3blCX97aXIm4TfAXvQ5I-ZZGepkvSo_32i_RMBqI3yUV--fM8f4QOCT4hhNTfyQmvJKml2EEryitWcoqbXbTCuOEl5VjsoU8xPmCMJRP4I9qjjNAK13yFru8m3bs0FzrGKejBQqGHtnBDCyPkY0hF66NbQwpz0fmQX_NjCtqPEHRyGyieyqDnooWNs_AZfeh0H-Fge--j-x_n92e_ysubnxdnp5el5ZSIsqaswbIinc4jcTDG1Mw0omJYS9tK2hjRGm4p451sAAzvaqozMFVdSUzZPvqyxPqYnIrWJbC_rR8GsEnRvHyDa5HV8aLG4P9MEJNau2ih7_UAfoqKEE4EEw2XmX5dqA0-xgCdGoNb6zArgtVzx4qobcfZHm1jJ7OG9kX-KzWDcgGProf57SR1dbsN_Lb450Vyp354-bPx4T8_tt17-PWofwEI358Y</recordid><startdate>201211</startdate><enddate>201211</enddate><creator>Eaton, D. 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>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>OTOTI</scope></search><sort><creationdate>201211</creationdate><title>Quality assurance and independent dosimetry for an intraoperative x-ray device</title><author>Eaton, D. J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4215-82390671fa0064ebbb83b95730a6cd629b5db4c234f69eeb4f82ab95b7876023</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>60 APPLIED LIFE SCIENCES</topic><topic>ACCURACY</topic><topic>Annealing</topic><topic>BRACHYTHERAPY</topic><topic>Calibrating of instruments or apparatus</topic><topic>CALIBRATION</topic><topic>DEPTH DOSE DISTRIBUTIONS</topic><topic>Dose‐volume analysis</topic><topic>Dosimeters</topic><topic>DOSIMETRY</topic><topic>Dosimetry/exposure assessment</topic><topic>Electric measurements</topic><topic>electronic brachytherapy</topic><topic>ENERGY DEPENDENCE</topic><topic>Error analysis</topic><topic>Film Dosimetry</topic><topic>INTRABEAM</topic><topic>Intraoperative Period</topic><topic>intraoperative radiotherapy</topic><topic>ionisation chambers</topic><topic>IONIZATION CHAMBERS</topic><topic>Linear accelerators</topic><topic>Monte Carlo Method</topic><topic>QUALITY ASSURANCE</topic><topic>Quality Control</topic><topic>RADIATION DOSES</topic><topic>RADIATION PROTECTION AND DOSIMETRY</topic><topic>radiation therapy</topic><topic>RADIOLOGY AND NUCLEAR MEDICINE</topic><topic>Radiometry - instrumentation</topic><topic>Standards and calibration</topic><topic>Testing or calibrating of apparatus or arrangements provided for in groups G01D1/00 to G01D15/00</topic><topic>Therapeutic applications, including brachytherapy</topic><topic>THERMOLUMINESCENT DOSEMETERS</topic><topic>thermoluminescent dosimeters</topic><topic>Thermoluminescent Dosimetry</topic><topic>Tissues</topic><topic>Uncertainty</topic><topic>WATER</topic><topic>X RADIATION</topic><topic>X-RAY SOURCES</topic><topic>X-Rays</topic><topic>X‐ray scattering</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Eaton, D. J.</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><collection>OSTI.GOV</collection><jtitle>Medical Physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Eaton, D. J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Quality assurance and independent dosimetry for an intraoperative x-ray device</atitle><jtitle>Medical Physics</jtitle><addtitle>Med Phys</addtitle><date>2012-11</date><risdate>2012</risdate><volume>39</volume><issue>11</issue><spage>6908</spage><epage>6920</epage><pages>6908-6920</pages><issn>0094-2405</issn><eissn>2473-4209</eissn><coden>MPHYA6</coden><abstract>Purpose:
Quality assurance is an essential component of accurate and safe radiotherapy delivery, and should include measurements which are independent of manufacturer-provided calibration. However, the physical and dosimetric properties of the INTRABEAM compact mobile 50 kV x-ray source are different from conventional kilovoltage therapy units and few reports describe methods for independent checks, frequencies, or tolerances for quality assurance tests.
Methods:
Based on the available evidence and local experience, methods are described for determination of the key dosimetric parameters: beam quality, output, isotropy, and depth doses. Internal system checks are also described, along with measurements of long-term stability.
Results:
A small volume parallel plate ionization chamber in a liquid water tank is the gold standard for measurements with this unit, but solid water-equivalent materials, thermoluminescent dosimeters and radiochromic film can all be used as practical alternatives with an accuracy of 5%–10%. The main cause of measurement uncertainty is positioning of the detector in the steep dose gradient, but energy dependence should also be considered.
Conclusions:
A quality assurance schedule with suggested tolerances is proposed, which includes both internal tests, before each treatment and on a monthly basis, and independent tests every year or after servicing or recalibration.</abstract><cop>United States</cop><pub>American Association of Physicists in Medicine</pub><pmid>23127084</pmid><doi>10.1118/1.4761865</doi><tpages>13</tpages></addata></record> |
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| ispartof | Medical Physics, 2012-11, Vol.39 (11), p.6908-6920 |
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| source | MEDLINE; Access via Wiley Online Library; Alma/SFX Local Collection |
| subjects | 60 APPLIED LIFE SCIENCES ACCURACY Annealing BRACHYTHERAPY Calibrating of instruments or apparatus CALIBRATION DEPTH DOSE DISTRIBUTIONS Dose‐volume analysis Dosimeters DOSIMETRY Dosimetry/exposure assessment Electric measurements electronic brachytherapy ENERGY DEPENDENCE Error analysis Film Dosimetry INTRABEAM Intraoperative Period intraoperative radiotherapy ionisation chambers IONIZATION CHAMBERS Linear accelerators Monte Carlo Method QUALITY ASSURANCE Quality Control RADIATION DOSES RADIATION PROTECTION AND DOSIMETRY radiation therapy RADIOLOGY AND NUCLEAR MEDICINE Radiometry - instrumentation Standards and calibration Testing or calibrating of apparatus or arrangements provided for in groups G01D1/00 to G01D15/00 Therapeutic applications, including brachytherapy THERMOLUMINESCENT DOSEMETERS thermoluminescent dosimeters Thermoluminescent Dosimetry Tissues Uncertainty WATER X RADIATION X-RAY SOURCES X-Rays X‐ray scattering |
| title | Quality assurance and independent dosimetry for an intraoperative x-ray device |
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