查詢結果分析
相關文獻
- 頭頸部腫瘤於左右兩側照野時, 劑量分佈不均勻度的分析及簡易套裝組織補償器的運用
- 強度調控放射治療應用等效組織補償器對表面劑量正常器官劑量之影響
- 以米及水作為組織補償器對假體表面劑量之影響
- Postoperative Radiotherapy of Adult Supratentorial High-grade Astrocytoma
- Malignant Primary Extragonadal Germ Cell Tumors of Mediastinum--An Analysis of Clinical and Radiological Features in 15 Cases
- Radiation Therapy in Primary Central Nervous System Lymphoma
- Implications of a Failed Prospective Trial of Adjuvant Therapy after Radical Hysterectomy for Stage Ib-IIa Cervical Carcinoma with Pelvic Node Metastases
- 攝護腺癌之傳統放射線治療--長庚紀念醫院十四年之經驗
- Preoperative Radiotherapy in Patients with Lower Rectal Cancer:Results of Sphincter-Preservation, Treatment Outcome and Morbidities
- A Phase Ⅱ Study of Neoadjuvant Interferon Alfa-2B and Concurrent Interferon and Radiotherapy in Primary Untreated Undifferentiated Carcinoma of Nasopharynx
頁籤選單縮合
題 名 | 頭頸部腫瘤於左右兩側照野時, 劑量分佈不均勻度的分析及簡易套裝組織補償器的運用=Assessment of Dose Nonuniformity Under Bilateral Opposed Fields for Head and Neck Tumor and Introduction of a Simple Application Model Tissue Compensator |
---|---|
作 者 | 陳尚文; 林芳仁; 涂振邦; 蕭安成; 吳學鼎; 梁基安; 楊世能; | 書刊名 | 放射治療與腫瘤學 |
卷 期 | 5:3 1998.09[民87.09] |
頁 次 | 頁157-162 |
分類號 | 416.36 |
關鍵詞 | 放射治療; 劑量分佈不均勻; 組織補償器; Radiotherapy; Dose nonuniformity; Tissue compensator; |
語 文 | 中文(Chinese) |
中文摘要 | 目的:左右兩側照野的放射治療在頭頸部腫瘤的治療上相當普遍。因頭部與頸部前 緣的治療深度有差異,所以評估計劃目標体積內劑量分佈不均勻的現象,並發展一種簡易的 套裝組織補償器的運用方式,以改善治療時的不均勻度。 材料與方法:首先分析12例因頭頸部腫瘤而接受左右兩側照野之病人,其中舌癌4例,下咽癌 4例,鼻咽癌4例。這些病人的頭部及頸部寬度以電腦斷層攝影分析,其中頭部寬度的參考點 定在照野的中心(field center),而頸部寬度的參考點定在頸椎C3及C4交界處之治療截面向 前延伸離頸部前緣2 cm(參考點A)及3 cm(參考點B)。於模擬攝影時將照野中頸部寬度明顯 減少區域標示於片子上,經由電腦斷層攝影分析標示區的頸部落差情況,以標示區各截面之脊 椎骨椎体前緣當作三角型的底邊的參考線,可量出每個案例頸部三角型區域的角度θ以θ之 平均值製作了幾套單一斜度的組織補償器。 結果:若以照野的中心為基準,前頸部劑量過高的情況如下,參考點A高出治療中心點之處方 劑量(prescribed dose)的平均值分別是舌癌13.7%(10.0~16.6%),下咽癌7.4%(5.8~9.9%), 鼻咽癌為13.6%(12.4~14.4%);而頸部參考點B高出治療中心點之處方劑量的平均值分別是舌 癌11.7%(9.5~14.7%),下咽癌5.4%(4.0~6.7%),鼻咽癌為10.1%(7.4~13.1%)。病人頸部標 示區不同截面的θ角度數都落在35至55度之間,若以5度為間隔單位,其中有9例θ角平均 值為45度,2例平均值為50度,1例平均值為40度。而個別使用了單一斜度率(分別為40,45 及50度)的套裝組織補償器後,發現頸部劑量過高的情況已有很大的改善。 結論:頭頸部腫瘤當進行大範圍的左右兩側照野時,必須評估照野內前頸部治療劑量是否較中 心點給予劑量為高。如果無法針對每一個案製作一個組織補償器,本交所介紹之簡易的套裝 組織補償器的運用方式,作為改善前頸治療劑量不均勻的一種參考。 |
英文摘要 | Purpose: For the radiotherapy of many head and neck tumors, bilateral parallel opposed fields have been used for initial treatment. Because the thickness of head and anterior portion of neck may be different, our study is to evaluate the dose nonuniformity within target volume and to introduce a simple application model of tissue compensator to improve the dose nonuniformity for the bilateral treatment. Materials and methods: We analyzed the data of twelve cases with head and neck tumors (4 tongue cancers, 4 hypopharyngeal cancers, and the rest are nasopharyngeal cancer). They received bilateral parallel opposed fields for initial treatment. The thickness of head and neck was estimated from CT scan, the reference point of the thickness of head was defined at field center, and the reference points of the thickness of neck were defined at cross-section of C3-C4 interface, 2 cm from anterior margin of neck (reference point A), 3 cm from anterior margin (reference point B). During simulation, the area with significant deficit was delineated, and was analyzed on CT scan. If the line along the anterior border of vertebral body was defined as the base of a triangle, we can find the base angle θ of anterior neck. Following measurement and analysis of angle θ of different sections on CT scan, several sets of compensator were made. Results: If the given dose was normalized at the center of radiation field, the average percentage of overdose of anterior neck was as following: reference point A, 13.7% (10.0~16.6) for tongue cancer, 7.4% (5.8~9.9) for hypopharyngeal cancer, 13.6% (12.4~14.4) for nasopharyngeal cancer; reference point B, 11.7% (9.5~14.7), 5.4% (4.0~6.7), and 10.1% (7.4~13.1) respectively. The degree of angle 6 at different cross-sections of anterior neck were all within the range of 35° to 55°. With the interval of 5 degree as a unit, the mean degree of angle 6 is 45° for 9 cases, 50° for 2 cases, and 40° for one case. After the application of compensator with simple slope (40°, 45°, and 50°), the overdose of anterior neck has been substantially improved. Conclusion: When bilateral parallel opposed fields are used for the initial treatment of head neck tumors, the dose nonuniformity of anterior portion of neck should be assessed. If significant overdose was noted and it is impossible to make tissue compensator case by case, the simple application model of tissue compensator for anterior neck can be considered. |
本系統中英文摘要資訊取自各篇刊載內容。