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Application of OSL strips in CT dosimetry according to the AAPM methodology
Computed tomography (CT) images contribute to high-quality medical diagnosis, but radiation dose can be quite high, requiring accurate assessment. CT dose index (CTDI) was developed for dosimetric purposes, but for scanners operated exclusively in axial mode. Nowadays, CTDI underestimate patient dos...
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Published in: | Brazilian Journal of Radiation Sciences 2023-05, Vol.11 (2), p.1-10 |
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description | Computed tomography (CT) images contribute to high-quality medical diagnosis, but radiation dose can be quite high, requiring accurate assessment. CT dose index (CTDI) was developed for dosimetric purposes, but for scanners operated exclusively in axial mode. Nowadays, CTDI underestimate patient dose in helical CT exams. AAPM report TG111 (2010) suggested a new metric in which the patient's radiation dose is obtained from dose profiles constructed from several measurements made with a small ionization chamber. It is also possible to obtain dose profiles using properly calibrated OSL (optically stimulated luminescence) strips. The main objective of the present work is to contribute to optimizing CT dosimetry, comparing dose profiles obtained with OSL strips with measurements obtained by other authors. In this work, a “pencil” ionization chamber and 20 cm x 0.3 cm OSL strips were X-ray-irradiated, in air and in the holes of two cylindrical CT phantoms, using 100, 120, 140 kV peak voltages, both in lab and in a clinical CT scanner. Irradiated strips were read using an OSL reader built in the GDRFM. OSL profiles were calibrated against ionization chamber. From them, CTDIw and CTDIvol values were determined, differing approximately 3.9% from those of the CT scanner. From the profiles, also the planar equilibrium dose Deq,p (TG111) was evaluated in some CT protocols; Deq,p exceeded the CTDI values from the CT scanner in every case. E.g.: The percentage difference between Deq,p and CTDIvol for the head phantom ranged between 33-25%. Thus, in some cases, it could be advantageous to use calibrated OSL dosimeters instead of ionization chambers to obtain the profiles, saving time, because it is possible to obtain five OSL profiles from a single phantom irradiation. |
doi_str_mv | 10.15392/2319-0612.2023.2259 |
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CT dose index (CTDI) was developed for dosimetric purposes, but for scanners operated exclusively in axial mode. Nowadays, CTDI underestimate patient dose in helical CT exams. AAPM report TG111 (2010) suggested a new metric in which the patient's radiation dose is obtained from dose profiles constructed from several measurements made with a small ionization chamber. It is also possible to obtain dose profiles using properly calibrated OSL (optically stimulated luminescence) strips. The main objective of the present work is to contribute to optimizing CT dosimetry, comparing dose profiles obtained with OSL strips with measurements obtained by other authors. In this work, a “pencil” ionization chamber and 20 cm x 0.3 cm OSL strips were X-ray-irradiated, in air and in the holes of two cylindrical CT phantoms, using 100, 120, 140 kV peak voltages, both in lab and in a clinical CT scanner. Irradiated strips were read using an OSL reader built in the GDRFM. OSL profiles were calibrated against ionization chamber. From them, CTDIw and CTDIvol values were determined, differing approximately 3.9% from those of the CT scanner. From the profiles, also the planar equilibrium dose Deq,p (TG111) was evaluated in some CT protocols; Deq,p exceeded the CTDI values from the CT scanner in every case. E.g.: The percentage difference between Deq,p and CTDIvol for the head phantom ranged between 33-25%. Thus, in some cases, it could be advantageous to use calibrated OSL dosimeters instead of ionization chambers to obtain the profiles, saving time, because it is possible to obtain five OSL profiles from a single phantom irradiation.</description><identifier>ISSN: 2319-0612</identifier><identifier>EISSN: 2319-0612</identifier><identifier>DOI: 10.15392/2319-0612.2023.2259</identifier><language>eng</language><publisher>Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)</publisher><subject>AAPM methodology ; dose profiles ; equilibrium doses ; OSL strips</subject><ispartof>Brazilian Journal of Radiation Sciences, 2023-05, Vol.11 (2), p.1-10</ispartof><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>Terini, Ricardo Andrade</creatorcontrib><creatorcontrib>Oliveira, Johnatan Dias</creatorcontrib><creatorcontrib>Yoshimura, Elisabeth Mateus</creatorcontrib><title>Application of OSL strips in CT dosimetry according to the AAPM methodology</title><title>Brazilian Journal of Radiation Sciences</title><description>Computed tomography (CT) images contribute to high-quality medical diagnosis, but radiation dose can be quite high, requiring accurate assessment. CT dose index (CTDI) was developed for dosimetric purposes, but for scanners operated exclusively in axial mode. Nowadays, CTDI underestimate patient dose in helical CT exams. AAPM report TG111 (2010) suggested a new metric in which the patient's radiation dose is obtained from dose profiles constructed from several measurements made with a small ionization chamber. It is also possible to obtain dose profiles using properly calibrated OSL (optically stimulated luminescence) strips. The main objective of the present work is to contribute to optimizing CT dosimetry, comparing dose profiles obtained with OSL strips with measurements obtained by other authors. In this work, a “pencil” ionization chamber and 20 cm x 0.3 cm OSL strips were X-ray-irradiated, in air and in the holes of two cylindrical CT phantoms, using 100, 120, 140 kV peak voltages, both in lab and in a clinical CT scanner. Irradiated strips were read using an OSL reader built in the GDRFM. OSL profiles were calibrated against ionization chamber. From them, CTDIw and CTDIvol values were determined, differing approximately 3.9% from those of the CT scanner. From the profiles, also the planar equilibrium dose Deq,p (TG111) was evaluated in some CT protocols; Deq,p exceeded the CTDI values from the CT scanner in every case. E.g.: The percentage difference between Deq,p and CTDIvol for the head phantom ranged between 33-25%. Thus, in some cases, it could be advantageous to use calibrated OSL dosimeters instead of ionization chambers to obtain the profiles, saving time, because it is possible to obtain five OSL profiles from a single phantom irradiation.</description><subject>AAPM methodology</subject><subject>dose profiles</subject><subject>equilibrium doses</subject><subject>OSL strips</subject><issn>2319-0612</issn><issn>2319-0612</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><sourceid>DOA</sourceid><recordid>eNpNkM9qAyEQh6W00JDmDXrwBZI6uuvqcQn9E5qSQtOzuOomhk1cdC95-7ppCT3NzG_gm-FD6BHIAkom6RNlIOeEA11QQtmC0lLeoMk1vf3X36NZSgdCCBWSVcAn6L3u-84bPfhwwqHFm681TkP0fcL-hJdbbEPyRzfEM9bGhGj9aYeHgIe9w3X9-YHzbh9s6MLu_IDuWt0lN_urU_T98rxdvs3Xm9fVsl7PDUB-hElHpHBSgtVNfrY0oqGNbawoC9Yy4TjYwpqyaPNUUFMxaXgFoDkFw13Jpmj1y7VBH1Qf_VHHswraq0sQ4k7pOHjTOQWiFZBPUdMUmWdFZfMx3VaMWyZBZlbxyzIxpBRde-UBURe_arSnRntq9KtGv-wH8qJrsw</recordid><startdate>20230531</startdate><enddate>20230531</enddate><creator>Terini, Ricardo Andrade</creator><creator>Oliveira, Johnatan Dias</creator><creator>Yoshimura, Elisabeth Mateus</creator><general>Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)</general><scope>AAYXX</scope><scope>CITATION</scope><scope>DOA</scope></search><sort><creationdate>20230531</creationdate><title>Application of OSL strips in CT dosimetry according to the AAPM methodology</title><author>Terini, Ricardo Andrade ; Oliveira, Johnatan Dias ; Yoshimura, Elisabeth Mateus</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c1119-39e098e991dab2595c8b2bdbd8543f38e61d4dc54f3f342c739c6711a621c6e53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>AAPM methodology</topic><topic>dose profiles</topic><topic>equilibrium doses</topic><topic>OSL strips</topic><toplevel>online_resources</toplevel><creatorcontrib>Terini, Ricardo Andrade</creatorcontrib><creatorcontrib>Oliveira, Johnatan Dias</creatorcontrib><creatorcontrib>Yoshimura, Elisabeth Mateus</creatorcontrib><collection>CrossRef</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>Brazilian Journal of Radiation Sciences</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Terini, Ricardo Andrade</au><au>Oliveira, Johnatan Dias</au><au>Yoshimura, Elisabeth Mateus</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Application of OSL strips in CT dosimetry according to the AAPM methodology</atitle><jtitle>Brazilian Journal of Radiation Sciences</jtitle><date>2023-05-31</date><risdate>2023</risdate><volume>11</volume><issue>2</issue><spage>1</spage><epage>10</epage><pages>1-10</pages><issn>2319-0612</issn><eissn>2319-0612</eissn><abstract>Computed tomography (CT) images contribute to high-quality medical diagnosis, but radiation dose can be quite high, requiring accurate assessment. CT dose index (CTDI) was developed for dosimetric purposes, but for scanners operated exclusively in axial mode. Nowadays, CTDI underestimate patient dose in helical CT exams. AAPM report TG111 (2010) suggested a new metric in which the patient's radiation dose is obtained from dose profiles constructed from several measurements made with a small ionization chamber. It is also possible to obtain dose profiles using properly calibrated OSL (optically stimulated luminescence) strips. The main objective of the present work is to contribute to optimizing CT dosimetry, comparing dose profiles obtained with OSL strips with measurements obtained by other authors. In this work, a “pencil” ionization chamber and 20 cm x 0.3 cm OSL strips were X-ray-irradiated, in air and in the holes of two cylindrical CT phantoms, using 100, 120, 140 kV peak voltages, both in lab and in a clinical CT scanner. Irradiated strips were read using an OSL reader built in the GDRFM. OSL profiles were calibrated against ionization chamber. From them, CTDIw and CTDIvol values were determined, differing approximately 3.9% from those of the CT scanner. From the profiles, also the planar equilibrium dose Deq,p (TG111) was evaluated in some CT protocols; Deq,p exceeded the CTDI values from the CT scanner in every case. E.g.: The percentage difference between Deq,p and CTDIvol for the head phantom ranged between 33-25%. Thus, in some cases, it could be advantageous to use calibrated OSL dosimeters instead of ionization chambers to obtain the profiles, saving time, because it is possible to obtain five OSL profiles from a single phantom irradiation.</abstract><pub>Brazilian Radiation Protection Society (Sociedade Brasileira de Proteção Radiológica, SBPR)</pub><doi>10.15392/2319-0612.2023.2259</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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subjects | AAPM methodology dose profiles equilibrium doses OSL strips |
title | Application of OSL strips in CT dosimetry according to the AAPM methodology |
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