First application of a high‐resolution silicon detector for proton beam Bragg peak detection in a 0.95 T magnetic field.
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| Title: | First application of a high‐resolution silicon detector for proton beam Bragg peak detection in a 0.95 T magnetic field. |
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| Authors: | Causer, Trent J.1,2 (AUTHOR) tjc721@uowmail.edu.au, Schellhammer, Sonja M.3,4 (AUTHOR), Gantz, Sebastian3,4 (AUTHOR), Lühr, Armin3,4,5 (AUTHOR), Hoffmann, Aswin L.3,4,6 (AUTHOR), Metcalfe, Peter E.2,7 (AUTHOR), Rosenfeld, Anatoly B.2 (AUTHOR), Guatelli, Susanna2 (AUTHOR), Petasecca, Marco2 (AUTHOR), Oborn, Bradley M.1,2 (AUTHOR) |
| Source: | Medical Physics. Jan2020, Vol. 47 Issue 1, p181-189. 9p. |
| Subjects: | Silicon detectors, Magnetic fields, Nuclear counters, Proton beams, Silicon diodes, Monte Carlo method |
| Abstract: | Purpose: To report on experimental results of a high spatial resolution silicon‐based detector exposed to therapeutic quality proton beams in a 0.95 T transverse magnetic field. These experimental results are important for the development of accurate and novel dosimetry methods in future potential real‐time MRI‐guided proton therapy systems. Methods: A permanent magnet device was utilized to generate a 0.95 T magnetic field over a 4 × 20 × 15 cm3 volume. Within this volume, a high‐resolution silicon diode array detector was positioned inside a PMMA phantom of 4 × 15 × 12 cm3. This detector contains two orthogonal strips containing 505 sensitive volumes spaced at 0.2 mm apart. Proton beams collimated to a circle of 10 mm diameter with nominal energies of 90 MeV, 110 MeV, and 125 MeV were incident on the detector from an edge‐on orientation. This allows for a measurement of the Bragg peak at 0.2 mm spatial resolution in both the depth and lateral profile directions. The impact of the magnetic field on the proton beams, that is, a small deflection was also investigated. A Geant4 Monte Carlo simulation was performed of the experimental setup to aid in interpretation of the results. Results: The nominal Bragg peak for each proton energy was successfully observed with a 0.2 mm spatial resolution in the 0.95 T transverse magnetic field in both a depth and lateral profiles. The proton beam deflection (at 0.95 T) was a consistent 2 ±0.5 mm at the center of the magnetic volume for each beam energy. However, a pristine Bragg peak was not observed for each energy. This was caused by the detector packaging having small air gaps between layers of the phantom material surrounding the diode array. These air gaps act to degrade the shape of the Bragg peak, and further to this, the nonwater equivalent silicon chip acts to separate the Bragg peak into multiple peaks depending on the proton path taken. Overall, a promising performance of the silicon detector array was observed, however, with a qualitative assessment rather than a robust quantitative dosimetric evaluation at this stage of development. Conclusions: For the first time, a high‐resolution silicon‐based radiation detector has been used to measure proton beam Bragg peak deflections in a phantom due to a strong magnetic field. Future efforts are required to optimize the detector packaging to strengthen the robustness of the dosimetric quantities obtained from the detector. Such high‐resolution silicon diode arrays may be useful in future efforts in MRI‐guided proton therapy research. [ABSTRACT FROM AUTHOR] |
| Copyright of Medical Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 141252305 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: First application of a high‐resolution silicon detector for proton beam Bragg peak detection in a 0.95 T magnetic field. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Causer%2C+Trent+J%2E%22">Causer, Trent J.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> tjc721@uowmail.edu.au</i><br /><searchLink fieldCode="AR" term="%22Schellhammer%2C+Sonja+M%2E%22">Schellhammer, Sonja M.</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gantz%2C+Sebastian%22">Gantz, Sebastian</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lühr%2C+Armin%22">Lühr, Armin</searchLink><relatesTo>3,4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hoffmann%2C+Aswin+L%2E%22">Hoffmann, Aswin L.</searchLink><relatesTo>3,4,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Metcalfe%2C+Peter+E%2E%22">Metcalfe, Peter E.</searchLink><relatesTo>2,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rosenfeld%2C+Anatoly+B%2E%22">Rosenfeld, Anatoly B.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guatelli%2C+Susanna%22">Guatelli, Susanna</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Petasecca%2C+Marco%22">Petasecca, Marco</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Oborn%2C+Bradley+M%2E%22">Oborn, Bradley M.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Medical+Physics%22">Medical Physics</searchLink>. Jan2020, Vol. 47 Issue 1, p181-189. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Silicon+detectors%22">Silicon detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+counters%22">Nuclear counters</searchLink><br /><searchLink fieldCode="DE" term="%22Proton+beams%22">Proton beams</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon+diodes%22">Silicon diodes</searchLink><br /><searchLink fieldCode="DE" term="%22Monte+Carlo+method%22">Monte Carlo method</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: To report on experimental results of a high spatial resolution silicon‐based detector exposed to therapeutic quality proton beams in a 0.95 T transverse magnetic field. These experimental results are important for the development of accurate and novel dosimetry methods in future potential real‐time MRI‐guided proton therapy systems. Methods: A permanent magnet device was utilized to generate a 0.95 T magnetic field over a 4 × 20 × 15 cm3 volume. Within this volume, a high‐resolution silicon diode array detector was positioned inside a PMMA phantom of 4 × 15 × 12 cm3. This detector contains two orthogonal strips containing 505 sensitive volumes spaced at 0.2 mm apart. Proton beams collimated to a circle of 10 mm diameter with nominal energies of 90 MeV, 110 MeV, and 125 MeV were incident on the detector from an edge‐on orientation. This allows for a measurement of the Bragg peak at 0.2 mm spatial resolution in both the depth and lateral profile directions. The impact of the magnetic field on the proton beams, that is, a small deflection was also investigated. A Geant4 Monte Carlo simulation was performed of the experimental setup to aid in interpretation of the results. Results: The nominal Bragg peak for each proton energy was successfully observed with a 0.2 mm spatial resolution in the 0.95 T transverse magnetic field in both a depth and lateral profiles. The proton beam deflection (at 0.95 T) was a consistent 2 ±0.5 mm at the center of the magnetic volume for each beam energy. However, a pristine Bragg peak was not observed for each energy. This was caused by the detector packaging having small air gaps between layers of the phantom material surrounding the diode array. These air gaps act to degrade the shape of the Bragg peak, and further to this, the nonwater equivalent silicon chip acts to separate the Bragg peak into multiple peaks depending on the proton path taken. Overall, a promising performance of the silicon detector array was observed, however, with a qualitative assessment rather than a robust quantitative dosimetric evaluation at this stage of development. Conclusions: For the first time, a high‐resolution silicon‐based radiation detector has been used to measure proton beam Bragg peak deflections in a phantom due to a strong magnetic field. Future efforts are required to optimize the detector packaging to strengthen the robustness of the dosimetric quantities obtained from the detector. Such high‐resolution silicon diode arrays may be useful in future efforts in MRI‐guided proton therapy research. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Medical Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/mp.13871 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 181 Subjects: – SubjectFull: Silicon detectors Type: general – SubjectFull: Magnetic fields Type: general – SubjectFull: Nuclear counters Type: general – SubjectFull: Proton beams Type: general – SubjectFull: Silicon diodes Type: general – SubjectFull: Monte Carlo method Type: general Titles: – TitleFull: First application of a high‐resolution silicon detector for proton beam Bragg peak detection in a 0.95 T magnetic field. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Causer, Trent J. – PersonEntity: Name: NameFull: Schellhammer, Sonja M. – PersonEntity: Name: NameFull: Gantz, Sebastian – PersonEntity: Name: NameFull: Lühr, Armin – PersonEntity: Name: NameFull: Hoffmann, Aswin L. – PersonEntity: Name: NameFull: Metcalfe, Peter E. – PersonEntity: Name: NameFull: Rosenfeld, Anatoly B. – PersonEntity: Name: NameFull: Guatelli, Susanna – PersonEntity: Name: NameFull: Petasecca, Marco – PersonEntity: Name: NameFull: Oborn, Bradley M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 00942405 Numbering: – Type: volume Value: 47 – Type: issue Value: 1 Titles: – TitleFull: Medical Physics Type: main |
| ResultId | 1 |
