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SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber
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| Zeitschriftentitel: | Medical Physics |
|---|---|
| Personen und Körperschaften: | , , , , , , , , , |
| In: | Medical Physics, 33, 2006, 6Part12, S. 2127-2128 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Wiley
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| Schlagwörter: |
| author_facet |
Peroni, C Brusasco, C Cirio, R Donetti, M Giordanengo, S Gomola, I Iliescu, S Marchetto, F Nastasi, U Stasi, M Peroni, C Brusasco, C Cirio, R Donetti, M Giordanengo, S Gomola, I Iliescu, S Marchetto, F Nastasi, U Stasi, M |
|---|---|
| author |
Peroni, C Brusasco, C Cirio, R Donetti, M Giordanengo, S Gomola, I Iliescu, S Marchetto, F Nastasi, U Stasi, M |
| spellingShingle |
Peroni, C Brusasco, C Cirio, R Donetti, M Giordanengo, S Gomola, I Iliescu, S Marchetto, F Nastasi, U Stasi, M Medical Physics SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber General Medicine |
| author_sort |
peroni, c |
| spelling |
Peroni, C Brusasco, C Cirio, R Donetti, M Giordanengo, S Gomola, I Iliescu, S Marchetto, F Nastasi, U Stasi, M 0094-2405 2473-4209 Wiley General Medicine http://dx.doi.org/10.1118/1.2241275 <jats:p><jats:bold>Purpose:</jats:bold> To attest the accuracy of the penumbra measurement with the use of a 2D pixel ionization chamber. <jats:bold>Method and Materials:</jats:bold> Penumbra measurements were carried out for several clinical cases, treated with Intensity Modulated Radiation Therapy, with a pixel ionization chamber and with radiographic film as reference. The pixel chamber consists of a matrix 1020 detectors, each 4.5 mm diameter and 5 mm height at a pitch of 7.62 mm. Each of the 1020 ionization chambers was read out independently with no dead time. Standard radiographic films have been used, scanned with a pitch of 0.16 mm and 0.40 mm. Both detectors were irradiated with 6 MV photon beams, using a linac equipped with a 120‐leaves multileaf collimator. Measured dose profiles were fitted with a “Fermi‐like” function: <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/mp1275-math-0001.png" xlink:title="urn:x-wiley:0094-2405:media:mp1275:mp1275-math-0001" /> with <jats:italic>x</jats:italic><jats:sub>0</jats:sub> and <jats:italic>a</jats:italic> as free parameters; the value for the penumbra could then be derived from the fit. The two sets of data were compared. <jats:bold>Results:</jats:bold> The data for the penumbra measured with the pixel chamber and the film for several IMRT fields show a strong linear correlation. This made it possible to correct the penumbra values obtained with the pixel ionization chamber to obtain a precise measurement even in a range well below the pixel dimensions. <jats:bold>Conclusion:</jats:bold> The 2D pixel ionization chamber has been shown to be able to measure the penumbra down to ∼ 2mm with an accuracy of ± 0.6 mm. This device can then efficiently replace radiographic film in some QA procedures with a significative gain in time as it gives results in real‐time and data are immediately available. Conflict of Interest: Research sponsored by MAESTRO, European project on Methods and Advanced Equipment for Simulation and Treatment in Radiation Oncology.</jats:p> SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber Medical Physics |
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Wiley, 2006 |
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Medical Physics |
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| title |
SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_unstemmed |
SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_full |
SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_fullStr |
SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_full_unstemmed |
SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_short |
SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_sort |
su‐ff‐t‐354: penumbra measurement with the use of a 2d pixel ionization chamber |
| topic |
General Medicine |
| url |
http://dx.doi.org/10.1118/1.2241275 |
| publishDate |
2006 |
| physical |
2127-2128 |
| description |
<jats:p><jats:bold>Purpose:</jats:bold> To attest the accuracy of the penumbra measurement with the use of a 2D pixel ionization chamber. <jats:bold>Method and Materials:</jats:bold> Penumbra measurements were carried out for several clinical cases, treated with Intensity Modulated Radiation Therapy, with a pixel ionization chamber and with radiographic film as reference. The pixel chamber consists of a matrix 1020 detectors, each 4.5 mm diameter and 5 mm height at a pitch of 7.62 mm. Each of the 1020 ionization chambers was read out independently with no dead time. Standard radiographic films have been used, scanned with a pitch of 0.16 mm and 0.40 mm. Both detectors were irradiated with 6 MV photon beams, using a linac equipped with a 120‐leaves multileaf collimator. Measured dose profiles were fitted with a “Fermi‐like” function: <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/mp1275-math-0001.png" xlink:title="urn:x-wiley:0094-2405:media:mp1275:mp1275-math-0001" /> with <jats:italic>x</jats:italic><jats:sub>0</jats:sub> and <jats:italic>a</jats:italic> as free parameters; the value for the penumbra could then be derived from the fit. The two sets of data were compared. <jats:bold>Results:</jats:bold> The data for the penumbra measured with the pixel chamber and the film for several IMRT fields show a strong linear correlation. This made it possible to correct the penumbra values obtained with the pixel ionization chamber to obtain a precise measurement even in a range well below the pixel dimensions. <jats:bold>Conclusion:</jats:bold> The 2D pixel ionization chamber has been shown to be able to measure the penumbra down to ∼ 2mm with an accuracy of ± 0.6 mm. This device can then efficiently replace radiographic film in some QA procedures with a significative gain in time as it gives results in real‐time and data are immediately available. Conflict of Interest: Research sponsored by MAESTRO, European project on Methods and Advanced Equipment for Simulation and Treatment in Radiation Oncology.</jats:p> |
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| author | Peroni, C, Brusasco, C, Cirio, R, Donetti, M, Giordanengo, S, Gomola, I, Iliescu, S, Marchetto, F, Nastasi, U, Stasi, M |
| author_facet | Peroni, C, Brusasco, C, Cirio, R, Donetti, M, Giordanengo, S, Gomola, I, Iliescu, S, Marchetto, F, Nastasi, U, Stasi, M, Peroni, C, Brusasco, C, Cirio, R, Donetti, M, Giordanengo, S, Gomola, I, Iliescu, S, Marchetto, F, Nastasi, U, Stasi, M |
| author_sort | peroni, c |
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| description | <jats:p><jats:bold>Purpose:</jats:bold> To attest the accuracy of the penumbra measurement with the use of a 2D pixel ionization chamber. <jats:bold>Method and Materials:</jats:bold> Penumbra measurements were carried out for several clinical cases, treated with Intensity Modulated Radiation Therapy, with a pixel ionization chamber and with radiographic film as reference. The pixel chamber consists of a matrix 1020 detectors, each 4.5 mm diameter and 5 mm height at a pitch of 7.62 mm. Each of the 1020 ionization chambers was read out independently with no dead time. Standard radiographic films have been used, scanned with a pitch of 0.16 mm and 0.40 mm. Both detectors were irradiated with 6 MV photon beams, using a linac equipped with a 120‐leaves multileaf collimator. Measured dose profiles were fitted with a “Fermi‐like” function: <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/mp1275-math-0001.png" xlink:title="urn:x-wiley:0094-2405:media:mp1275:mp1275-math-0001" /> with <jats:italic>x</jats:italic><jats:sub>0</jats:sub> and <jats:italic>a</jats:italic> as free parameters; the value for the penumbra could then be derived from the fit. The two sets of data were compared. <jats:bold>Results:</jats:bold> The data for the penumbra measured with the pixel chamber and the film for several IMRT fields show a strong linear correlation. This made it possible to correct the penumbra values obtained with the pixel ionization chamber to obtain a precise measurement even in a range well below the pixel dimensions. <jats:bold>Conclusion:</jats:bold> The 2D pixel ionization chamber has been shown to be able to measure the penumbra down to ∼ 2mm with an accuracy of ± 0.6 mm. This device can then efficiently replace radiographic film in some QA procedures with a significative gain in time as it gives results in real‐time and data are immediately available. Conflict of Interest: Research sponsored by MAESTRO, European project on Methods and Advanced Equipment for Simulation and Treatment in Radiation Oncology.</jats:p> |
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| id | ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTExOC8xLjIyNDEyNzU |
| imprint | Wiley, 2006 |
| imprint_str_mv | Wiley, 2006 |
| institution | DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1 |
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| physical | 2127-2128 |
| publishDate | 2006 |
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| publisher | Wiley |
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| series | Medical Physics |
| source_id | 49 |
| spelling | Peroni, C Brusasco, C Cirio, R Donetti, M Giordanengo, S Gomola, I Iliescu, S Marchetto, F Nastasi, U Stasi, M 0094-2405 2473-4209 Wiley General Medicine http://dx.doi.org/10.1118/1.2241275 <jats:p><jats:bold>Purpose:</jats:bold> To attest the accuracy of the penumbra measurement with the use of a 2D pixel ionization chamber. <jats:bold>Method and Materials:</jats:bold> Penumbra measurements were carried out for several clinical cases, treated with Intensity Modulated Radiation Therapy, with a pixel ionization chamber and with radiographic film as reference. The pixel chamber consists of a matrix 1020 detectors, each 4.5 mm diameter and 5 mm height at a pitch of 7.62 mm. Each of the 1020 ionization chambers was read out independently with no dead time. Standard radiographic films have been used, scanned with a pitch of 0.16 mm and 0.40 mm. Both detectors were irradiated with 6 MV photon beams, using a linac equipped with a 120‐leaves multileaf collimator. Measured dose profiles were fitted with a “Fermi‐like” function: <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/mp1275-math-0001.png" xlink:title="urn:x-wiley:0094-2405:media:mp1275:mp1275-math-0001" /> with <jats:italic>x</jats:italic><jats:sub>0</jats:sub> and <jats:italic>a</jats:italic> as free parameters; the value for the penumbra could then be derived from the fit. The two sets of data were compared. <jats:bold>Results:</jats:bold> The data for the penumbra measured with the pixel chamber and the film for several IMRT fields show a strong linear correlation. This made it possible to correct the penumbra values obtained with the pixel ionization chamber to obtain a precise measurement even in a range well below the pixel dimensions. <jats:bold>Conclusion:</jats:bold> The 2D pixel ionization chamber has been shown to be able to measure the penumbra down to ∼ 2mm with an accuracy of ± 0.6 mm. This device can then efficiently replace radiographic film in some QA procedures with a significative gain in time as it gives results in real‐time and data are immediately available. Conflict of Interest: Research sponsored by MAESTRO, European project on Methods and Advanced Equipment for Simulation and Treatment in Radiation Oncology.</jats:p> SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber Medical Physics |
| spellingShingle | Peroni, C, Brusasco, C, Cirio, R, Donetti, M, Giordanengo, S, Gomola, I, Iliescu, S, Marchetto, F, Nastasi, U, Stasi, M, Medical Physics, SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber, General Medicine |
| title | SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_full | SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_fullStr | SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_full_unstemmed | SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_short | SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| title_sort | su‐ff‐t‐354: penumbra measurement with the use of a 2d pixel ionization chamber |
| title_unstemmed | SU‐FF‐T‐354: Penumbra Measurement with the Use of a 2D Pixel Ionization Chamber |
| topic | General Medicine |
| url | http://dx.doi.org/10.1118/1.2241275 |