Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors
Introduction: During radiotherapy, high accuracy in the dose delivery is required because there is a strong relationship between the absorbed dose, local tumor control and particularly the normal tissue damage. In many institutions, in vivo dosimetry using diodes is performed to check the actual d...
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| Format: | Article |
| Language: | English |
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Mashhad University of Medical Sciences
2005-06-01
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| Series: | Iranian Journal of Medical Physics |
| Subjects: | |
| Online Access: | http://ijmp.mums.ac.ir/article_8109_e6d6499f00893b5abbaa3426ac9d0d55.pdf |
| _version_ | 1828805557285289984 |
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| author | M. Taghizadeh Dabbagh M. Allahverdi M. Esfahani P. Haddad |
| author_facet | M. Taghizadeh Dabbagh M. Allahverdi M. Esfahani P. Haddad |
| author_sort | M. Taghizadeh Dabbagh |
| collection | DOAJ |
| description | Introduction: During radiotherapy, high accuracy in the dose delivery is required because there is a strong
relationship between the absorbed dose, local tumor control and particularly the normal tissue damage. In
many institutions, in vivo dosimetry using diodes is performed to check the actual dose delivered. In general,
the uncertainty in the dose delivered should fall within ± 5% of the prescribed dose as recommended by the
International Commission on Radiation Units and Measurements (ICRU).
Materials and Methods: The combined entrance and exit dose measurements have been performed for brain
tumors by diode detectors. In vivo detectors used in this study were P-type semiconductor diodes used for
determination of absorbed dose and exit transmission (T ex ). A Perspex water phantom (30×30 cm
3
area and
thickness ranging from 5 to 30 cm) and a farmer type ionization chamber (0.6 cm
3
) were used for the
measurements. The calibration and correction factor are calculated and the relevant curves have been
obtained. The SSD correction factor (SSD = 80 cm for all set-up), directional dependence and temperature
dependence (0.1) was observed.
Discussion and Conclusion: In vivo measurements have been shown to be very useful as a check of the dose
delivered to a given patient. |
| first_indexed | 2024-12-12T07:56:09Z |
| format | Article |
| id | doaj.art-99b7a42242074760a25bd06ebcbb241f |
| institution | Directory Open Access Journal |
| issn | 2345-3672 2345-3672 |
| language | English |
| last_indexed | 2024-12-12T07:56:09Z |
| publishDate | 2005-06-01 |
| publisher | Mashhad University of Medical Sciences |
| record_format | Article |
| series | Iranian Journal of Medical Physics |
| spelling | doaj.art-99b7a42242074760a25bd06ebcbb241f2022-12-22T00:32:18ZengMashhad University of Medical SciencesIranian Journal of Medical Physics2345-36722345-36722005-06-0122132510.22038/ijmp.2005.81098109Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode DetectorsM. Taghizadeh Dabbagh0M. Allahverdi1M. Esfahani2P. Haddad3M.Sc. in Medical Physics, Medical Imaging Center, Imam Hosein Hospital, Shahrood College of Medical Sciences, Shahrood, Iran.Assistant Professor, Medical Physics Dept., Cancer Institute, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran.M.Sc. in Medical Physics, Cancer Institute, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran.Associate Professor, Radiation Therapy Dept., Cancer Institute, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran.Introduction: During radiotherapy, high accuracy in the dose delivery is required because there is a strong relationship between the absorbed dose, local tumor control and particularly the normal tissue damage. In many institutions, in vivo dosimetry using diodes is performed to check the actual dose delivered. In general, the uncertainty in the dose delivered should fall within ± 5% of the prescribed dose as recommended by the International Commission on Radiation Units and Measurements (ICRU). Materials and Methods: The combined entrance and exit dose measurements have been performed for brain tumors by diode detectors. In vivo detectors used in this study were P-type semiconductor diodes used for determination of absorbed dose and exit transmission (T ex ). A Perspex water phantom (30×30 cm 3 area and thickness ranging from 5 to 30 cm) and a farmer type ionization chamber (0.6 cm 3 ) were used for the measurements. The calibration and correction factor are calculated and the relevant curves have been obtained. The SSD correction factor (SSD = 80 cm for all set-up), directional dependence and temperature dependence (0.1) was observed. Discussion and Conclusion: In vivo measurements have been shown to be very useful as a check of the dose delivered to a given patient.http://ijmp.mums.ac.ir/article_8109_e6d6499f00893b5abbaa3426ac9d0d55.pdfQuality assuranceIn vivo dosimetrySemiconductor detectorsBrain tumors |
| spellingShingle | M. Taghizadeh Dabbagh M. Allahverdi M. Esfahani P. Haddad Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors Iranian Journal of Medical Physics Quality assurance In vivo dosimetry Semiconductor detectors Brain tumors |
| title | Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors |
| title_full | Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors |
| title_fullStr | Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors |
| title_full_unstemmed | Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors |
| title_short | Verification of the Accuracy of the Delivered Dose in Brain Tumors by in Vivo Dosimetry Using Diode Detectors |
| title_sort | verification of the accuracy of the delivered dose in brain tumors by in vivo dosimetry using diode detectors |
| topic | Quality assurance In vivo dosimetry Semiconductor detectors Brain tumors |
| url | http://ijmp.mums.ac.ir/article_8109_e6d6499f00893b5abbaa3426ac9d0d55.pdf |
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