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Ullattil, Pushpaja, Susheela, Lakshmi, Nair, Haridas, Remesan Nair, Anoop, Nair, Sneha, G, Sreelekshmi, Bhaskaran, Prasath, Kunheri, Beena. (1403). Planning Target Volume Margin Assessment Using Daily Cone Beam Computed Tomography Image Verification in Prostate Cancer Patients. , 22(1), 50-55. doi: 10.22038/ijmp.2023.65971.2135
Pushpaja Kuttassery Ullattil; Lakshmi Jayachandran Susheela; Haridas M Nair; Anoop Remesan Nair; Sneha S Nair; Sreelekshmi G; Prasath Bhaskaran; Beena Kunheri. "Planning Target Volume Margin Assessment Using Daily Cone Beam Computed Tomography Image Verification in Prostate Cancer Patients". , 22, 1, 1403, 50-55. doi: 10.22038/ijmp.2023.65971.2135
Ullattil, Pushpaja, Susheela, Lakshmi, Nair, Haridas, Remesan Nair, Anoop, Nair, Sneha, G, Sreelekshmi, Bhaskaran, Prasath, Kunheri, Beena. (1403). 'Planning Target Volume Margin Assessment Using Daily Cone Beam Computed Tomography Image Verification in Prostate Cancer Patients', , 22(1), pp. 50-55. doi: 10.22038/ijmp.2023.65971.2135
Ullattil, Pushpaja, Susheela, Lakshmi, Nair, Haridas, Remesan Nair, Anoop, Nair, Sneha, G, Sreelekshmi, Bhaskaran, Prasath, Kunheri, Beena. Planning Target Volume Margin Assessment Using Daily Cone Beam Computed Tomography Image Verification in Prostate Cancer Patients. , 1403; 22(1): 50-55. doi: 10.22038/ijmp.2023.65971.2135

Planning Target Volume Margin Assessment Using Daily Cone Beam Computed Tomography Image Verification in Prostate Cancer Patients

Iranian Journal of Medical Physics
دوره 22، شماره 1، فروردین و اردیبهشت 2025، صفحه 50-55    اصل مقاله (1.33 M)
نوع مقاله: Original Paper
شناسه دیجیتال (DOI): 10.22038/ijmp.2023.65971.2135
نویسندگان
Pushpaja Kuttassery Ullattil1؛ Lakshmi Jayachandran Susheela2؛ Haridas M Nair2؛ Anoop Remesan Nair* 3؛ Sneha S Nair4؛ Sreelekshmi G2؛ Prasath Bhaskaran2؛ Beena Kunheri5
1Department of Radiation Oncology, Amrita Institute of Medical Sciences and Research, Amrita School of Medicine, Amrita Vishwa Vidyapeetham, AIMS, Ponekkara P.O., Kochi, Kerala, Pin Code 682041
2Department of Radiation Oncology, Amrita School of Medicine, Amrita Vishwa Vidyapeetham, AIMS Ponekkara PO, Kochi, Kerala, Pincode 682041
3Department of Radiation Oncology, Amrita Institute of Medical Sciences and Research, Amrita School of Medicine, Amrita Vishwa Vidyapeetham, AIMS, Ponekkara PO, Kochi, Kerala, Pin code 682041.
4Department of Medical Physics and Radiation Safety Amrita Institute of Medical Sciences, Amrita University Kochi, Kerala, 682041 India
5Department of Radiation Oncology Amrita Institute of Medical Sciences, Amrita University Kochi, Kerala, 682041 India
چکیده
Introduction: Conformal radiation techniques are widely used in prostate cancer treatment as it improves the therapeutic ratio. However, inter- and intra-fraction variations remain challenging, which reflects on the planning target volume (PTV) margin. This study aimed to determine the benefit of daily Cone Beam Computed Tomography (CBCT) in reducing the  PTV margin.
Material and Methods: 51 patients over 3 years were included in the study.  PTV was obtained by applying 8mm in left-right (LR) and anterior (A), 5mm in posterior (P) and 8mm in superior-inferior (SI) directions of clinical target volumes (CTV). Pelvic bones of CBCT were matched with the planning CT scan and manually adjusted with soft tissue, assessing the total inter-fraction error. Values were registered in left-right (X), superior-inferior (Y), and anterior-posterior (Z) directions.
Results: The median age was 71 years and  84.3% were in the high-risk group. The mean inter-fraction error (Mp) was obtained in all three principal axes (x, y, z). The majority had shifts ≤ 0.3cm. None recorded a shift >1cm. The Random errors were 0.44cm in LR (X), 0.36cm in SI (Y) and 0.40cm in AP (Z) directions. The systematic errors were 0.05cm in LR (X), 0.04cm in SI (Y) and 0.04cm in AP (Z) directions. The PTV margin was calculated using van Herk’s formula and obtained as 0.68cm.
Conclusion: Routine use of CBCT significantly reduces the random and systematic errors and ensures safer dose escalation with reduced PTV margin.
کلیدواژه‌ها
Prostate Intensity Modulated Radiotherapy Cone؛ Beam Computed Tomography
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