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Dosimetry and treatment efficiency of SBRT using TaiChiB radiotherapy system for two-lung lesions with one overlapping organs at risk.
- Source :
- Journal of X-Ray Science & Technology; 2024, Vol. 32 Issue 2, p379-394, 16p
- Publication Year :
- 2024
-
Abstract
- Purpose: This study aims to assess the dosimetry and treatment efficiency of TaiChiB-based Stereotactic Body Radiotherapy (SBRT) plans applying to treat two-lung lesions with one overlapping organs at risk. Methods: For four retrospective patients diagnosed with two-lung lesions each patient, four treatment plans were designed including Plan <subscript>Edge</subscript>, TaiChiB linac-based, RGS-based, and a linac-RGS hybrid (Plan <subscript>TCLinac</subscript>, Plan <subscript>TCRGS</subscript>, and Plan <subscript>TCHybrid</subscript>). Dosimetric metrics and beam-on time were employed to evaluate and compare the TaiChiB-based plans against Plan <subscript>Edge</subscript>. Results: For Conformity Index (CI), Plan <subscript>TCRGS</subscript> outperformed all other plans with an average CI of 1.06, as opposed to Plan <subscript>Edge′</subscript>s 1.33. Similarly, for R<subscript>50 %</subscript>, Plan <subscript>TCRGS</subscript> was superior with an average R<subscript>50 %</subscript> of 3.79, better than Plan <subscript>Edge′</subscript>s 4.28. In terms of D<subscript>2</subscript><subscript>cm</subscript>, Plan <subscript>TCRGS</subscript> also led with an average of 48.48%, compared to Plan <subscript>Edge′</subscript>s 56.25%. For organ at risk (OAR) sparing, Plan <subscript>TCRGS</subscript> often displayed the lowest dosimetric values, notably for the spinal cord (D<subscript>max</subscript> 5.92 Gy) and lungs (D<subscript>1500cc</subscript> 1.00 Gy, D<subscript>1000cc</subscript> 2.61 Gy, V<subscript>10</subscript><subscript>Gy</subscript> 15.14%). However, its high D<subscript>max</subscript> values for the heart and great vessels sometimes exceeded safety thresholds. Plan <subscript>TCHybrid</subscript> presented a balanced approach, showing doses comparable to or better than Plan <subscript>Edge</subscript> without crossing safety limits. In terms of beam-on time, Plan <subscript>TCLinac</subscript> emerged as the most efficient treatment option in three out of four cases, followed closely by Plan <subscript>Edge</subscript> in one case. Plan <subscript>TCRGS</subscript>, despite its dosimetric advantages, was the least efficient, recording notably longer beam-on times, with a peak at 33.28 minutes in Case 2. Conclusion: For patients with two-lung lesions treated by SBRT whose one lesion overlaps with OARs, the Plan <subscript>TCHybrid</subscript> delivered by TaiChiB digital radiotherapy system can be recommended as a clinical option. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08953996
- Volume :
- 32
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of X-Ray Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 176365868
- Full Text :
- https://doi.org/10.3233/XST-230176