Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife
Purpose To measure the absorbed dose rate to water of60 Co gamma rays of a Gamma Knife Model C using water-filled phantoms (WFP). Methods and Materials Spherical WFP with an equivalent water depth of 5, 7, 8, and 9 cm were constructed. The dose rates at the center of an 18-mm helmet were measured in...
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| Veröffentlicht in: | International journal of radiation oncology, biology, physics biology, physics, 2011-04, Vol.79 (5), p.1580-1587 |
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| creator | Chung, Hyun-Tai, Ph.D Park, Youngho, Ph.D Hyun, Sangil, Ph.D Choi, Yongsoo, Ph.D Kim, Gi Hong, M.Sc Kim, Dong Gyu, M.D., Ph.D Chun, Kook Jin, Ph.D |
| description | Purpose To measure the absorbed dose rate to water of60 Co gamma rays of a Gamma Knife Model C using water-filled phantoms (WFP). Methods and Materials Spherical WFP with an equivalent water depth of 5, 7, 8, and 9 cm were constructed. The dose rates at the center of an 18-mm helmet were measured in an 8-cm WFP (WFP-3) and two plastic phantoms. Two independent measurement systems were used: one was calibrated to an air kerma (Set I) and the other was calibrated to the absorbed dose to water (Set II). The dose rates of WFP-3 and the plastic phantoms were converted to dose rates for an 8-cm water depth using the attenuation coefficient and the equivalent water depths. Results The dose rate measured at the center of WFP-3 using Set II was 2.2% and 1.0% higher than dose rates measured at the center of the two plastic phantoms. The measured effective attenuation coefficient of Gamma Knife photon beam in WFPs was 0.0621 cm−1 . After attenuation correction, the difference between the dose rate at an 8-cm water depth measured in WFP-3 and dose rates in the plastic phantoms was smaller than the uncertainty of the measurements. Conclusions Systematic errors related to the characteristics of the phantom materials in the dose rate measurement of a Gamma Knife need to be corrected for. Correction of the dose rate using an equivalent water depth and attenuation provided results that were more consistent. |
| doi_str_mv | 10.1016/j.ijrobp.2010.05.039 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_osti_</sourceid><recordid>TN_cdi_osti_scitechconnect_21491681</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0360301610007625</els_id><sourcerecordid>857812640</sourcerecordid><originalsourceid>FETCH-LOGICAL-c520t-5d532ca036657d7bdb9cbbbdc34037aac426e4f057bc39beb783f5f393f53e5d3</originalsourceid><addsrcrecordid>eNqFktuKFDEQhoMo7uzoG4gERLzqsdLp9OFGWHZ1V1wQPN-FJF3Npu1OxiQj7Ntv2h4VvPEmBeH76_BXEfKEwY4Bq1-OOzsGr_e7EvIXiB3w7h7ZsLbpCi7Et_tkA7yGgmf4hJzGOAIAY031kJyU0ALwttqQLxeYMMzWqWS9o36g6QbpmY4-aOzphY9IP6iENHn6NcdABx9-Mawt5ple4TRjWnSKXqp5VvSdswM-Ig8GNUV8fIxb8vnN60_nV8X1-8u352fXhRElpEL0gpdG5T5r0fSN7nVntNa94RXwRilTlTVWA4hGG95p1E3LBzHwLr8cRc-35Nma18dkZTQ2obkx3jk0SZas6ljdsky9WKl98D8OGJOcbTQ4TcqhP0TZiqZlZZ1rbkm1kib4GAMOch_srMKtZCAX2-UoV9vlYrsEIbPtWfb0WOCgZ-z_iH77nIHnR0BFo6YhKGds_MtVDLjolkSvVg6zaT8thmUmdAZ7G5aRem__18m_Ccxknc01v-MtxtEfgssLkUzGUoL8uJzIciEsH0dTl4LfAaKttOA</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>857812640</pqid></control><display><type>article</type><title>Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife</title><source>MEDLINE</source><source>ScienceDirect Journals (5 years ago - present)</source><creator>Chung, Hyun-Tai, Ph.D ; Park, Youngho, Ph.D ; Hyun, Sangil, Ph.D ; Choi, Yongsoo, Ph.D ; Kim, Gi Hong, M.Sc ; Kim, Dong Gyu, M.D., Ph.D ; Chun, Kook Jin, Ph.D</creator><creatorcontrib>Chung, Hyun-Tai, Ph.D ; Park, Youngho, Ph.D ; Hyun, Sangil, Ph.D ; Choi, Yongsoo, Ph.D ; Kim, Gi Hong, M.Sc ; Kim, Dong Gyu, M.D., Ph.D ; Chun, Kook Jin, Ph.D</creatorcontrib><description>Purpose To measure the absorbed dose rate to water of60 Co gamma rays of a Gamma Knife Model C using water-filled phantoms (WFP). Methods and Materials Spherical WFP with an equivalent water depth of 5, 7, 8, and 9 cm were constructed. The dose rates at the center of an 18-mm helmet were measured in an 8-cm WFP (WFP-3) and two plastic phantoms. Two independent measurement systems were used: one was calibrated to an air kerma (Set I) and the other was calibrated to the absorbed dose to water (Set II). The dose rates of WFP-3 and the plastic phantoms were converted to dose rates for an 8-cm water depth using the attenuation coefficient and the equivalent water depths. Results The dose rate measured at the center of WFP-3 using Set II was 2.2% and 1.0% higher than dose rates measured at the center of the two plastic phantoms. The measured effective attenuation coefficient of Gamma Knife photon beam in WFPs was 0.0621 cm−1 . After attenuation correction, the difference between the dose rate at an 8-cm water depth measured in WFP-3 and dose rates in the plastic phantoms was smaller than the uncertainty of the measurements. Conclusions Systematic errors related to the characteristics of the phantom materials in the dose rate measurement of a Gamma Knife need to be corrected for. Correction of the dose rate using an equivalent water depth and attenuation provided results that were more consistent.</description><identifier>ISSN: 0360-3016</identifier><identifier>EISSN: 1879-355X</identifier><identifier>DOI: 10.1016/j.ijrobp.2010.05.039</identifier><identifier>PMID: 20800384</identifier><identifier>CODEN: IOBPD3</identifier><language>eng</language><publisher>New York, NY: Elsevier Inc</publisher><subject>Absorbed dose to water ; Absorption ; Air ; Algorithms ; Applied radiobiology (equipment, dosimetry...) ; ATTENUATION ; Beam quality factor ; BEAMS ; BETA DECAY RADIOISOTOPES ; BETA-MINUS DECAY RADIOISOTOPES ; Biological and medical sciences ; Biological effects of radiation ; Calibration - standards ; COBALT 60 ; COBALT ISOTOPES ; Cobalt Radioisotopes - therapeutic use ; CORRECTIONS ; Displacement correction ; DOSE RATES ; DOSES ; ELECTROMAGNETIC RADIATION ; Equipment Design - standards ; ERRORS ; Fundamental and applied biological sciences. Psychology ; Gamma Knife ; GAMMA RADIATION ; Gamma Rays ; Head Protective Devices - standards ; Hematology, Oncology and Palliative Medicine ; HYDROGEN COMPOUNDS ; INTERMEDIATE MASS NUCLEI ; INTERNAL CONVERSION RADIOISOTOPES ; IONIZING RADIATIONS ; ISOMERIC TRANSITION ISOTOPES ; ISOTOPES ; MATERIALS ; MEDICINE ; MINUTES LIVING RADIOISOTOPES ; MOCKUP ; Models, Anatomic ; Monte Carlo Method ; NUCLEAR MEDICINE ; NUCLEI ; ODD-ODD NUCLEI ; ORGANIC COMPOUNDS ; ORGANIC POLYMERS ; OXYGEN COMPOUNDS ; PETROCHEMICALS ; PETROLEUM PRODUCTS ; PHANTOMS ; Phantoms, Imaging ; PHOTON BEAMS ; PLASTICS ; POLYMERS ; RADIATION DOSES ; Radiation Equipment and Supplies - standards ; RADIATIONS ; RADIOISOTOPES ; RADIOLOGY ; RADIOLOGY AND NUCLEAR MEDICINE ; Radiometry - methods ; Radiosurgery - instrumentation ; Radiosurgery - methods ; RADIOTHERAPY ; Radiotherapy Dosage ; Reference Standards ; STRUCTURAL MODELS ; SURGERY ; SYNTHETIC MATERIALS ; THERAPY ; Tissues, organs and organisms biophysics ; Uncertainty ; WATER ; Water-filled phantom ; YEARS LIVING RADIOISOTOPES</subject><ispartof>International journal of radiation oncology, biology, physics, 2011-04, Vol.79 (5), p.1580-1587</ispartof><rights>Elsevier Inc.</rights><rights>2011 Elsevier Inc.</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2011 Elsevier Inc. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c520t-5d532ca036657d7bdb9cbbbdc34037aac426e4f057bc39beb783f5f393f53e5d3</citedby><cites>FETCH-LOGICAL-c520t-5d532ca036657d7bdb9cbbbdc34037aac426e4f057bc39beb783f5f393f53e5d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0360301610007625$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=24103599$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/20800384$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/21491681$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Chung, Hyun-Tai, Ph.D</creatorcontrib><creatorcontrib>Park, Youngho, Ph.D</creatorcontrib><creatorcontrib>Hyun, Sangil, Ph.D</creatorcontrib><creatorcontrib>Choi, Yongsoo, Ph.D</creatorcontrib><creatorcontrib>Kim, Gi Hong, M.Sc</creatorcontrib><creatorcontrib>Kim, Dong Gyu, M.D., Ph.D</creatorcontrib><creatorcontrib>Chun, Kook Jin, Ph.D</creatorcontrib><title>Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife</title><title>International journal of radiation oncology, biology, physics</title><addtitle>Int J Radiat Oncol Biol Phys</addtitle><description>Purpose To measure the absorbed dose rate to water of60 Co gamma rays of a Gamma Knife Model C using water-filled phantoms (WFP). Methods and Materials Spherical WFP with an equivalent water depth of 5, 7, 8, and 9 cm were constructed. The dose rates at the center of an 18-mm helmet were measured in an 8-cm WFP (WFP-3) and two plastic phantoms. Two independent measurement systems were used: one was calibrated to an air kerma (Set I) and the other was calibrated to the absorbed dose to water (Set II). The dose rates of WFP-3 and the plastic phantoms were converted to dose rates for an 8-cm water depth using the attenuation coefficient and the equivalent water depths. Results The dose rate measured at the center of WFP-3 using Set II was 2.2% and 1.0% higher than dose rates measured at the center of the two plastic phantoms. The measured effective attenuation coefficient of Gamma Knife photon beam in WFPs was 0.0621 cm−1 . After attenuation correction, the difference between the dose rate at an 8-cm water depth measured in WFP-3 and dose rates in the plastic phantoms was smaller than the uncertainty of the measurements. Conclusions Systematic errors related to the characteristics of the phantom materials in the dose rate measurement of a Gamma Knife need to be corrected for. Correction of the dose rate using an equivalent water depth and attenuation provided results that were more consistent.</description><subject>Absorbed dose to water</subject><subject>Absorption</subject><subject>Air</subject><subject>Algorithms</subject><subject>Applied radiobiology (equipment, dosimetry...)</subject><subject>ATTENUATION</subject><subject>Beam quality factor</subject><subject>BEAMS</subject><subject>BETA DECAY RADIOISOTOPES</subject><subject>BETA-MINUS DECAY RADIOISOTOPES</subject><subject>Biological and medical sciences</subject><subject>Biological effects of radiation</subject><subject>Calibration - standards</subject><subject>COBALT 60</subject><subject>COBALT ISOTOPES</subject><subject>Cobalt Radioisotopes - therapeutic use</subject><subject>CORRECTIONS</subject><subject>Displacement correction</subject><subject>DOSE RATES</subject><subject>DOSES</subject><subject>ELECTROMAGNETIC RADIATION</subject><subject>Equipment Design - standards</subject><subject>ERRORS</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Gamma Knife</subject><subject>GAMMA RADIATION</subject><subject>Gamma Rays</subject><subject>Head Protective Devices - standards</subject><subject>Hematology, Oncology and Palliative Medicine</subject><subject>HYDROGEN COMPOUNDS</subject><subject>INTERMEDIATE MASS NUCLEI</subject><subject>INTERNAL CONVERSION RADIOISOTOPES</subject><subject>IONIZING RADIATIONS</subject><subject>ISOMERIC TRANSITION ISOTOPES</subject><subject>ISOTOPES</subject><subject>MATERIALS</subject><subject>MEDICINE</subject><subject>MINUTES LIVING RADIOISOTOPES</subject><subject>MOCKUP</subject><subject>Models, Anatomic</subject><subject>Monte Carlo Method</subject><subject>NUCLEAR MEDICINE</subject><subject>NUCLEI</subject><subject>ODD-ODD NUCLEI</subject><subject>ORGANIC COMPOUNDS</subject><subject>ORGANIC POLYMERS</subject><subject>OXYGEN COMPOUNDS</subject><subject>PETROCHEMICALS</subject><subject>PETROLEUM PRODUCTS</subject><subject>PHANTOMS</subject><subject>Phantoms, Imaging</subject><subject>PHOTON BEAMS</subject><subject>PLASTICS</subject><subject>POLYMERS</subject><subject>RADIATION DOSES</subject><subject>Radiation Equipment and Supplies - standards</subject><subject>RADIATIONS</subject><subject>RADIOISOTOPES</subject><subject>RADIOLOGY</subject><subject>RADIOLOGY AND NUCLEAR MEDICINE</subject><subject>Radiometry - methods</subject><subject>Radiosurgery - instrumentation</subject><subject>Radiosurgery - methods</subject><subject>RADIOTHERAPY</subject><subject>Radiotherapy Dosage</subject><subject>Reference Standards</subject><subject>STRUCTURAL MODELS</subject><subject>SURGERY</subject><subject>SYNTHETIC MATERIALS</subject><subject>THERAPY</subject><subject>Tissues, organs and organisms biophysics</subject><subject>Uncertainty</subject><subject>WATER</subject><subject>Water-filled phantom</subject><subject>YEARS LIVING RADIOISOTOPES</subject><issn>0360-3016</issn><issn>1879-355X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFktuKFDEQhoMo7uzoG4gERLzqsdLp9OFGWHZ1V1wQPN-FJF3Npu1OxiQj7Ntv2h4VvPEmBeH76_BXEfKEwY4Bq1-OOzsGr_e7EvIXiB3w7h7ZsLbpCi7Et_tkA7yGgmf4hJzGOAIAY031kJyU0ALwttqQLxeYMMzWqWS9o36g6QbpmY4-aOzphY9IP6iENHn6NcdABx9-Mawt5ple4TRjWnSKXqp5VvSdswM-Ig8GNUV8fIxb8vnN60_nV8X1-8u352fXhRElpEL0gpdG5T5r0fSN7nVntNa94RXwRilTlTVWA4hGG95p1E3LBzHwLr8cRc-35Nma18dkZTQ2obkx3jk0SZas6ljdsky9WKl98D8OGJOcbTQ4TcqhP0TZiqZlZZ1rbkm1kib4GAMOch_srMKtZCAX2-UoV9vlYrsEIbPtWfb0WOCgZ-z_iH77nIHnR0BFo6YhKGds_MtVDLjolkSvVg6zaT8thmUmdAZ7G5aRem__18m_Ccxknc01v-MtxtEfgssLkUzGUoL8uJzIciEsH0dTl4LfAaKttOA</recordid><startdate>20110401</startdate><enddate>20110401</enddate><creator>Chung, Hyun-Tai, Ph.D</creator><creator>Park, Youngho, Ph.D</creator><creator>Hyun, Sangil, Ph.D</creator><creator>Choi, Yongsoo, Ph.D</creator><creator>Kim, Gi Hong, M.Sc</creator><creator>Kim, Dong Gyu, M.D., Ph.D</creator><creator>Chun, Kook Jin, Ph.D</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope><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>20110401</creationdate><title>Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife</title><author>Chung, Hyun-Tai, Ph.D ; Park, Youngho, Ph.D ; Hyun, Sangil, Ph.D ; Choi, Yongsoo, Ph.D ; Kim, Gi Hong, M.Sc ; Kim, Dong Gyu, M.D., Ph.D ; Chun, Kook Jin, Ph.D</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c520t-5d532ca036657d7bdb9cbbbdc34037aac426e4f057bc39beb783f5f393f53e5d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Absorbed dose to water</topic><topic>Absorption</topic><topic>Air</topic><topic>Algorithms</topic><topic>Applied radiobiology (equipment, dosimetry...)</topic><topic>ATTENUATION</topic><topic>Beam quality factor</topic><topic>BEAMS</topic><topic>BETA DECAY RADIOISOTOPES</topic><topic>BETA-MINUS DECAY RADIOISOTOPES</topic><topic>Biological and medical sciences</topic><topic>Biological effects of radiation</topic><topic>Calibration - standards</topic><topic>COBALT 60</topic><topic>COBALT ISOTOPES</topic><topic>Cobalt Radioisotopes - therapeutic use</topic><topic>CORRECTIONS</topic><topic>Displacement correction</topic><topic>DOSE RATES</topic><topic>DOSES</topic><topic>ELECTROMAGNETIC RADIATION</topic><topic>Equipment Design - standards</topic><topic>ERRORS</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Gamma Knife</topic><topic>GAMMA RADIATION</topic><topic>Gamma Rays</topic><topic>Head Protective Devices - standards</topic><topic>Hematology, Oncology and Palliative Medicine</topic><topic>HYDROGEN COMPOUNDS</topic><topic>INTERMEDIATE MASS NUCLEI</topic><topic>INTERNAL CONVERSION RADIOISOTOPES</topic><topic>IONIZING RADIATIONS</topic><topic>ISOMERIC TRANSITION ISOTOPES</topic><topic>ISOTOPES</topic><topic>MATERIALS</topic><topic>MEDICINE</topic><topic>MINUTES LIVING RADIOISOTOPES</topic><topic>MOCKUP</topic><topic>Models, Anatomic</topic><topic>Monte Carlo Method</topic><topic>NUCLEAR MEDICINE</topic><topic>NUCLEI</topic><topic>ODD-ODD NUCLEI</topic><topic>ORGANIC COMPOUNDS</topic><topic>ORGANIC POLYMERS</topic><topic>OXYGEN COMPOUNDS</topic><topic>PETROCHEMICALS</topic><topic>PETROLEUM PRODUCTS</topic><topic>PHANTOMS</topic><topic>Phantoms, Imaging</topic><topic>PHOTON BEAMS</topic><topic>PLASTICS</topic><topic>POLYMERS</topic><topic>RADIATION DOSES</topic><topic>Radiation Equipment and Supplies - standards</topic><topic>RADIATIONS</topic><topic>RADIOISOTOPES</topic><topic>RADIOLOGY</topic><topic>RADIOLOGY AND NUCLEAR MEDICINE</topic><topic>Radiometry - methods</topic><topic>Radiosurgery - instrumentation</topic><topic>Radiosurgery - methods</topic><topic>RADIOTHERAPY</topic><topic>Radiotherapy Dosage</topic><topic>Reference Standards</topic><topic>STRUCTURAL MODELS</topic><topic>SURGERY</topic><topic>SYNTHETIC MATERIALS</topic><topic>THERAPY</topic><topic>Tissues, organs and organisms biophysics</topic><topic>Uncertainty</topic><topic>WATER</topic><topic>Water-filled phantom</topic><topic>YEARS LIVING RADIOISOTOPES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chung, Hyun-Tai, Ph.D</creatorcontrib><creatorcontrib>Park, Youngho, Ph.D</creatorcontrib><creatorcontrib>Hyun, Sangil, Ph.D</creatorcontrib><creatorcontrib>Choi, Yongsoo, Ph.D</creatorcontrib><creatorcontrib>Kim, Gi Hong, M.Sc</creatorcontrib><creatorcontrib>Kim, Dong Gyu, M.D., Ph.D</creatorcontrib><creatorcontrib>Chun, Kook Jin, Ph.D</creatorcontrib><collection>Pascal-Francis</collection><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>International journal of radiation oncology, biology, physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chung, Hyun-Tai, Ph.D</au><au>Park, Youngho, Ph.D</au><au>Hyun, Sangil, Ph.D</au><au>Choi, Yongsoo, Ph.D</au><au>Kim, Gi Hong, M.Sc</au><au>Kim, Dong Gyu, M.D., Ph.D</au><au>Chun, Kook Jin, Ph.D</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife</atitle><jtitle>International journal of radiation oncology, biology, physics</jtitle><addtitle>Int J Radiat Oncol Biol Phys</addtitle><date>2011-04-01</date><risdate>2011</risdate><volume>79</volume><issue>5</issue><spage>1580</spage><epage>1587</epage><pages>1580-1587</pages><issn>0360-3016</issn><eissn>1879-355X</eissn><coden>IOBPD3</coden><abstract>Purpose To measure the absorbed dose rate to water of60 Co gamma rays of a Gamma Knife Model C using water-filled phantoms (WFP). Methods and Materials Spherical WFP with an equivalent water depth of 5, 7, 8, and 9 cm were constructed. The dose rates at the center of an 18-mm helmet were measured in an 8-cm WFP (WFP-3) and two plastic phantoms. Two independent measurement systems were used: one was calibrated to an air kerma (Set I) and the other was calibrated to the absorbed dose to water (Set II). The dose rates of WFP-3 and the plastic phantoms were converted to dose rates for an 8-cm water depth using the attenuation coefficient and the equivalent water depths. Results The dose rate measured at the center of WFP-3 using Set II was 2.2% and 1.0% higher than dose rates measured at the center of the two plastic phantoms. The measured effective attenuation coefficient of Gamma Knife photon beam in WFPs was 0.0621 cm−1 . After attenuation correction, the difference between the dose rate at an 8-cm water depth measured in WFP-3 and dose rates in the plastic phantoms was smaller than the uncertainty of the measurements. Conclusions Systematic errors related to the characteristics of the phantom materials in the dose rate measurement of a Gamma Knife need to be corrected for. Correction of the dose rate using an equivalent water depth and attenuation provided results that were more consistent.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>20800384</pmid><doi>10.1016/j.ijrobp.2010.05.039</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0360-3016 |
| ispartof | International journal of radiation oncology, biology, physics, 2011-04, Vol.79 (5), p.1580-1587 |
| issn | 0360-3016 1879-355X |
| language | eng |
| recordid | cdi_osti_scitechconnect_21491681 |
| source | MEDLINE; ScienceDirect Journals (5 years ago - present) |
| subjects | Absorbed dose to water Absorption Air Algorithms Applied radiobiology (equipment, dosimetry...) ATTENUATION Beam quality factor BEAMS BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES Biological and medical sciences Biological effects of radiation Calibration - standards COBALT 60 COBALT ISOTOPES Cobalt Radioisotopes - therapeutic use CORRECTIONS Displacement correction DOSE RATES DOSES ELECTROMAGNETIC RADIATION Equipment Design - standards ERRORS Fundamental and applied biological sciences. Psychology Gamma Knife GAMMA RADIATION Gamma Rays Head Protective Devices - standards Hematology, Oncology and Palliative Medicine HYDROGEN COMPOUNDS INTERMEDIATE MASS NUCLEI INTERNAL CONVERSION RADIOISOTOPES IONIZING RADIATIONS ISOMERIC TRANSITION ISOTOPES ISOTOPES MATERIALS MEDICINE MINUTES LIVING RADIOISOTOPES MOCKUP Models, Anatomic Monte Carlo Method NUCLEAR MEDICINE NUCLEI ODD-ODD NUCLEI ORGANIC COMPOUNDS ORGANIC POLYMERS OXYGEN COMPOUNDS PETROCHEMICALS PETROLEUM PRODUCTS PHANTOMS Phantoms, Imaging PHOTON BEAMS PLASTICS POLYMERS RADIATION DOSES Radiation Equipment and Supplies - standards RADIATIONS RADIOISOTOPES RADIOLOGY RADIOLOGY AND NUCLEAR MEDICINE Radiometry - methods Radiosurgery - instrumentation Radiosurgery - methods RADIOTHERAPY Radiotherapy Dosage Reference Standards STRUCTURAL MODELS SURGERY SYNTHETIC MATERIALS THERAPY Tissues, organs and organisms biophysics Uncertainty WATER Water-filled phantom YEARS LIVING RADIOISOTOPES |
| title | Determination of the Absorbed Dose Rate to Water for the 18-mm Helmet of a Gamma Knife |
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