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Finding an improved amorphous-silicon x-ray flat-panel detector configuration for the in-line geometry.

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Title: Finding an improved amorphous-silicon x-ray flat-panel detector configuration for the in-line geometry.
Authors: Fast, M. F.1 m.fast@dkfz.de, Teymurazyan, A.2, Pang, G.2,3, Oelfke, U.1, Rowlands, J. A.2,4 rowlandj@tbh.net
Source: Physics in Medicine & Biology. 4/7/2013, Vol. 58 Issue 7, p2305-2324. 20p.
Subjects: Amorphous silicon, Detectors, Medical applications of x-rays, Monte Carlo method, Simulation methods & models
Abstract: We have previously investigated the use of a conventional amorphous-silicon flat-panel detector (FPD) for intrafractional image guidance in the in-line geometry. In this configuration, the FPD is mounted between the patient and the treatment head, with the front of the FPD facing towards the patient. By geometrically separating signals from the diagnostic (kV) and treatment (MV) beams, it is possible to monitor the patient and treatment beam at the same time. In this study, we propose an FPD design based on existing technology with a 70% reduced up-stream a real density that is more suited to this new application. We have investigated our FPD model by means of a validated Monte Carlo simulation. Experimentally, simple rectangular fields were used to irradiate through the detector and observe the impact of removing detector components such as the support structure or the phosphor screen on the measured signal. The proposed FPD performs better than the conventional FPD: (i) attenuation of the MV beam is decreased by 60%; (ii) the MV signal is reduced by 20% for the primary MV field region which can avoid saturation of the FPD; and (iii) long range scatter from the MV into the kV region of the detector is greatly reduced. [ABSTRACT FROM AUTHOR]
© 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 86635904
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Finding an improved amorphous-silicon x-ray flat-panel detector configuration for the in-line geometry.
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  Data: <searchLink fieldCode="AR" term="%22Fast%2C+M%2E+F%2E%22">Fast, M. F.</searchLink><relatesTo>1</relatesTo><i> m.fast@dkfz.de</i><br /><searchLink fieldCode="AR" term="%22Teymurazyan%2C+A%2E%22">Teymurazyan, A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pang%2C+G%2E%22">Pang, G.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Oelfke%2C+U%2E%22">Oelfke, U.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rowlands%2C+J%2E+A%2E%22">Rowlands, J. A.</searchLink><relatesTo>2,4</relatesTo><i> rowlandj@tbh.net</i>
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  Data: <searchLink fieldCode="JN" term="%22Physics+in+Medicine+%26+Biology%22">Physics in Medicine & Biology</searchLink>. 4/7/2013, Vol. 58 Issue 7, p2305-2324. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Amorphous+silicon%22">Amorphous silicon</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+applications+of+x-rays%22">Medical applications of x-rays</searchLink><br /><searchLink fieldCode="DE" term="%22Monte+Carlo+method%22">Monte Carlo method</searchLink><br /><searchLink fieldCode="DE" term="%22Simulation+methods+%26+models%22">Simulation methods & models</searchLink>
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  Data: We have previously investigated the use of a conventional amorphous-silicon flat-panel detector (FPD) for intrafractional image guidance in the in-line geometry. In this configuration, the FPD is mounted between the patient and the treatment head, with the front of the FPD facing towards the patient. By geometrically separating signals from the diagnostic (kV) and treatment (MV) beams, it is possible to monitor the patient and treatment beam at the same time. In this study, we propose an FPD design based on existing technology with a 70% reduced up-stream a real density that is more suited to this new application. We have investigated our FPD model by means of a validated Monte Carlo simulation. Experimentally, simple rectangular fields were used to irradiate through the detector and observe the impact of removing detector components such as the support structure or the phosphor screen on the measured signal. The proposed FPD performs better than the conventional FPD: (i) attenuation of the MV beam is decreased by 60%; (ii) the MV signal is reduced by 20% for the primary MV field region which can avoid saturation of the FPD; and (iii) long range scatter from the MV into the kV region of the detector is greatly reduced. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>© 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/0031-9155/58/7/2305
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      – Code: eng
        Text: English
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        PageCount: 20
        StartPage: 2305
    Subjects:
      – SubjectFull: Amorphous silicon
        Type: general
      – SubjectFull: Detectors
        Type: general
      – SubjectFull: Medical applications of x-rays
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      – SubjectFull: Monte Carlo method
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      – SubjectFull: Simulation methods & models
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      – TitleFull: Finding an improved amorphous-silicon x-ray flat-panel detector configuration for the in-line geometry.
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            NameFull: Pang, G.
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              Text: 4/7/2013
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              Y: 2013
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