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Congress: ECR25
Poster Number: C-12308
Type: Poster: EPOS Radiographer (educational)
Authorblock: W. Y. Jeong, H. C. Park, H. J. Kim; Gwangju/KR
Disclosures:
Won Young Jeong: Nothing to disclose
Ho Chun Park: Nothing to disclose
Hyo Jung Kim: Nothing to disclose
Keywords: Thorax, CT, Radiation therapy / Oncology, Radiotherapy techniques
Learning objectives Radiation therapy for esophageal cancer poses significant challenges in protecting normal tissues due to the proximity of critical organs such as the spinal cord, heart, and lungs. This challenge is further compounded by the risk of radiation-induced complications, particularly radiation pneumonia, a well-recognized side effect of radiation therapy. Previous studies investigating factors associated with radiation pneumonia have focused on comparing treatment planning techniques to reduce dose exposure to normal tissues, including the lungs.Key factors such as the mean lung dose(Dmean),...
Read more Background A total of 30 patients with esophageal cancer who received concurrent chemoradiotherapy (CCRT) at our institution between March 2021 and October 2023 were selected as the study population. [fig 1] The total prescribed dose was 50 Gy, delivered in 25 fractions using 10 MV energy, ensuring that at least 98% of the Planning Target Volume (PTV) received the prescribed dose. The maximum dose (Dmax) was kept below 108% of the prescribed dose. Critical normal tissues, including both lungs, the heart, and the...
Read more Findings and procedure details All treatment plans met the PTV criteria, demonstrating a uniform dose distribution. The average dose to the heart was 5.80 Gy for fVMAT, 6.97 Gy for pVMAT, and 7.60 Gy for ncVMAT, with fVMAT showing the lowest dose, which was statistically significant (p<0.001). In contrast, the average dose to the lungs was 9.01 Gy for fVMAT, 7.71 Gy for pVMAT, and 7.12 Gy for ncVMAT. The V5Gy (%) values were 52.22%, 38.61%, and 36.35%, while the V10Gy (%) values were...
Read more Conclusion fVMAT은 평균 폐 용량, V5Gy 및 V10Gy에서 가장 높은 값을 보였으며, 이는 폐 손상 위험이 증가했음을 나타냅니다. 이와는 대조적으로, ncVMAT는 평균 폐 선량인 V5Gy, V10Gy 및 V20Gy에서 가장 낮은 값을 보였으며, 이는 식도암 방사선 요법 중 폐 선량 분포를 최소화하고 폐를 보호하는 데 있어 상당한 임상적 이점을 강조했습니다. 그러나 Non-Coplanar Beams를 사용하려면 환자 설정 정확도를 신중하게 고려해야 하며 치료 시간이 늘어날 수 있습니다.따라서 최상의 결과를 얻기 위해서는 개별 환자의 상황과 치료 장비 및 시설의 능력을 고려하는 것과 함께 각 치료...
Read more References H. Hwang, S. H. Kim, J. H. Koo, J. K. Son, "Decrease of Irradiated Volume using Rotational Treatment by Avoidance Sector in Radiation Therapy for Esophageal Cancer", Journal of the Korean Society of Radiology, Vol. 12, No. 5, pp. 583-592, 2018 Wu, C. Xie, M. Hu, C. Han, J. Yi, Y. Zhou, H. Yuan, X. Jin, "Dosimetric benefits of IMRT and VMAT in the treatment of middle thoracic esophageal cancer: is the conformal radiotherapy still an alternative option?", Journal of Applied...
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