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Patil, Deepali, Zope, Mukesh, SAROJ, DINESH, A., Aslam P., George, Basil. (1403). Over-Response Correction of SNC 350p ROOS and PTW Markus Chambers in the Surface Dose and Build-Up Region Dosimetry of 6MV Photon Beam. , 21(4), 272-279. doi: 10.22038/ijmp.2023.71464.2264
Deepali Bhaskar Patil; Mukesh Kumar Zope; DINESH Kumar SAROJ; Aslam P. A.; Basil George. "Over-Response Correction of SNC 350p ROOS and PTW Markus Chambers in the Surface Dose and Build-Up Region Dosimetry of 6MV Photon Beam". , 21, 4, 1403, 272-279. doi: 10.22038/ijmp.2023.71464.2264
Patil, Deepali, Zope, Mukesh, SAROJ, DINESH, A., Aslam P., George, Basil. (1403). 'Over-Response Correction of SNC 350p ROOS and PTW Markus Chambers in the Surface Dose and Build-Up Region Dosimetry of 6MV Photon Beam', , 21(4), pp. 272-279. doi: 10.22038/ijmp.2023.71464.2264
Patil, Deepali, Zope, Mukesh, SAROJ, DINESH, A., Aslam P., George, Basil. Over-Response Correction of SNC 350p ROOS and PTW Markus Chambers in the Surface Dose and Build-Up Region Dosimetry of 6MV Photon Beam. , 1403; 21(4): 272-279. doi: 10.22038/ijmp.2023.71464.2264

Over-Response Correction of SNC 350p ROOS and PTW Markus Chambers in the Surface Dose and Build-Up Region Dosimetry of 6MV Photon Beam

Iranian Journal of Medical Physics
دوره 21، شماره 4، مهر و آبان 2024، صفحه 272-279    اصل مقاله (1.7 M)
نوع مقاله: Original Paper
شناسه دیجیتال (DOI): 10.22038/ijmp.2023.71464.2264
نویسندگان
Deepali Bhaskar Patil* 1؛ Mukesh Kumar Zope2؛ DINESH Kumar SAROJ3؛ Aslam P. A.4؛ Basil George5
1Department of Medical Physics,State Cancer Institute, Indira Gandhi Institute of Medical Sciences,Patna, Bihar.
2Indira Gandhi Institute Of Medical Sciences ,Sheikhpura ,Patna
3BALCO Medical Center, Vedanta Research Foundation, New Raipur, atal Nagar, Chhattisgarh 493661
4Department of Radiation Oncology, Kiran Multi Super Speciality Hospital, Surat-395004, Gujarat.
5Department of Radiation Oncology, STARLIT Cancer Center, Ahmadabad-382350, Gujarat.
چکیده
Introduction: The design characteristics of ionization chambers are critical for the accurate measurement of Percentage Surface Dose (PSD) and Percentage Depth Dose (PDD) in the build-up region. This study assesses the over-response correction in PSD and PDD for different field sizes, using Markus and ROOS fixed separation parallel-plate ionization chambers.
Material and Methods: The Sun Nuclear Corporation SNC 350P ROOS and PTW Markus parallel plate ionization chambers were used to measure 6 MV photon beam PDD along the central axis in the build-up region.The experiment was performed on a Solid Water® HE phantom with a density of 1.032 g/cm3.The Measurements were taken at a Source Surface distance (SSD) of 100 cm with Field sizes of 10x10cm2,20x20 cm2, and 30x30cm2 and at variable depths.
Results: For field sizes of 10x10 cm2, 20x20 cm2, and 30x30 cm2 at a source-to-axis distance (SAD) of 100 cm, the PSD values obtained with the Markus chamber, before and after applying Rawlinson's equation for over-response correction, were as follows: 35.11%, 42.92%, 50.72% (before correction) and 28.37%, 36.19%, 44.05% (after correction). Similarly, the PSD values measured using the ROOS chamber, before and after applying over-response correction, were as follows: 41.61%, 50.50%, 58.04% (before correction), and 33.96%, 42.87%, 50.38% (after correction).
Conclusion: The application of over-response correction using Rawlinson's equation improved the accuracy of measurements for both chambers, emphasizing the significance of employing appropriate correction techniques to ensure precise dose measurements in the build-up region using ionization chambers.
کلیدواژه‌ها
Radiation Dosage Percentage Surface Dose Build؛ Up Dose Dosimeters Radiotherapy
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