The measurement and comparison of dosimetry parameters of Orion (4 MV) lineer accelerators after magnetron changes
Abstract
OBJECTIVES Orion 5 (GE) model linear accelerator at our department was installed in 1998. Magnetrons have been replaced because of different technical problems up to now since installation. But any deviation from the original setting could have caused specific changes in the beam parameters. Therefore, we measured and evaluated the beam parameters for the possible changes in the values following magnetron replacements. METHODS The measurements were performed for quality index (TPR20/10), percentage depth dose (PDD), beam profiles for open fields, output, wedge out-put factors. The measurement data were compared with the standard values and the ones used. RESULTS Adjusted TPR20/10 values were found to be changing within at most 0.6% with BJR Sup. 25 data and PDD, out-put, dose profiles and wedge filter transmissions were found to be changing within at most 2% with BJR Supplement 25 data. CONCLUSION The results of the measurements performed following all magnetron replacements were found to be not exactly the same but within acceptable limits.
Keywords
Equipment Safety Particle Accelerators Quality Assurance Health Care Radiation Oncology Equipment and Supplies Radiometry
References
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- 2. Kutcher GJ, Coia L, Gillin M, Hanson WF, Leibel S, Morton RJ, et al. Comprehensive QA for radiation oncology: report of AAPM Radiation Therapy Committee Task Group 40. Med Phys 1994;21(4):581-618.
- 3. Williams JR, Thwaites DI. Radiotherapy physics. In: Practice. 2nd ed. Oxford University Press; 2000. p. 32-3.
- 4. Greene D, Williams PC. Linear accelerators for radiation therapy. 2nd ed. Bristol and Philadelphia: Institute of Physics Publishing; 1997. p. 1-9.
- 5. Khan FM. The Physics of Radiation Therapy Department of Therapeutic Radiology University of Minnesota. Baltimore: Williams and Wilkins; 1994. p. 52-4.
- 6. GE CGR MeV Orion Handbook: Operating instructions technical and operating manual. 1-2, 1-3.
- 7. Kuter S. Yüksek enerjili teleterapi cihazlar›. ‹.Ü. ‹stanbul T›p Fakültesi Radyoterapi Kürsüsü; 1975. p. 50-4. 8. British Journal of Radiology Supplement 25, Central Axis Depth Dose Data For Use in Radiotherapy: 1996. p. 86.
- 9. Aletti P, Bey P. Recommendations for a quality assurance programme in external radiotherapy. Booklet No:2, p. 9-36.
- 10. Kumar LSA, Davis CA, Padmanabhan V, Nair MK, Arun Kumar LS, Krishnan Nair M. Measurement and verification of beam data of a four MV linear accelerator: after the replacement of a faulty accelerator structure and magnetron. Journal of Medical Physics 1997;22(1):16-9.
Orion (4 MV) lineer hızlandırıcı cihazın magnetron değişimlerinden sonraki dozimetri parametrelerinin ölçümü ve karşılaştırılması
Abstract
AMAÇ Bölümümüzde bulunan GE marka Orion 5 model lineer akseleratör cihazı 1998 yılında kuruldu. Kurulumdan itibaren günümüze kadar cihazda oluşan farklı teknik sorunlar nedeniyle magnetron değişimleri gerçekleştirildi; ancak orijinal kurulumdan herhangi bir sapma, ışın parametrelerinde spesifik değişikliklere neden olabilir. Bu yüzden değişimi gerçekleştirilen beş magnetron için tüm magnetron değişimlerinden sonra ışın parametreleri ölçüldü ve değerlendirildi. GEREÇ VE YÖNTEM Kalite indeksi (TPR20/10), derin doz (%DD), açık alan doz profili, doz verimi, wedge faktörü ölçümleri yapıldı. Ölçüm verileri standart değerlerle ve kullanılan referansla karşılaştırıldı. BULGULAR Ayarlanan TPR20/10 değerlerinin BJR Supplement 25 verileriyle en çok %0.6; %DD, doz verimi, doz profil ve wedge filtre geçirgenliklerinin en çok %2.0 içerisinde değiştiği belirlendi. SONUÇ Tüm magnetron değişimlerinden sonra yapılan ölçüm sonuçlarının tamamen aynı olmadığı ancak sonuçların kabul edilebilir limitler içerisinde olduğu görüldü.
Keywords
Cihaz güvenli¤i magnetron parçacık hızlandırıcı/standartlar kalite güvencesi radyasyon onkolojisi/alet kullanma/standartlar
References
- 1. Nath R, Biggs PJ, Bova FJ, Ling CC, Purdy JA, van de Geijn J, et al. AAPM code of practice for radiotherapy accelerators: report of AAPM Radiation Therapy Task Group No. 45. Med Phys 1994;21(7):1093-121.
- 2. Kutcher GJ, Coia L, Gillin M, Hanson WF, Leibel S, Morton RJ, et al. Comprehensive QA for radiation oncology: report of AAPM Radiation Therapy Committee Task Group 40. Med Phys 1994;21(4):581-618.
- 3. Williams JR, Thwaites DI. Radiotherapy physics. In: Practice. 2nd ed. Oxford University Press; 2000. p. 32-3.
- 4. Greene D, Williams PC. Linear accelerators for radiation therapy. 2nd ed. Bristol and Philadelphia: Institute of Physics Publishing; 1997. p. 1-9.
- 5. Khan FM. The Physics of Radiation Therapy Department of Therapeutic Radiology University of Minnesota. Baltimore: Williams and Wilkins; 1994. p. 52-4.
- 6. GE CGR MeV Orion Handbook: Operating instructions technical and operating manual. 1-2, 1-3.
- 7. Kuter S. Yüksek enerjili teleterapi cihazlar›. ‹.Ü. ‹stanbul T›p Fakültesi Radyoterapi Kürsüsü; 1975. p. 50-4. 8. British Journal of Radiology Supplement 25, Central Axis Depth Dose Data For Use in Radiotherapy: 1996. p. 86.
- 9. Aletti P, Bey P. Recommendations for a quality assurance programme in external radiotherapy. Booklet No:2, p. 9-36.
- 10. Kumar LSA, Davis CA, Padmanabhan V, Nair MK, Arun Kumar LS, Krishnan Nair M. Measurement and verification of beam data of a four MV linear accelerator: after the replacement of a faulty accelerator structure and magnetron. Journal of Medical Physics 1997;22(1):16-9.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | February 1, 2007 |
| Published in Issue | Year 2007 Volume: 22 Issue: 1 |