Tangboonduangjit P, Wu I, Butson M, Rosenfeld A, Metcalfe P
Centre of Medical Radiation Physics, Dept. of Engineering Physics, University of Wollongong, Wollongong, Australia.
Australas Phys Eng Sci Med. 2003 Dec;26(4):194-9. doi: 10.1007/BF03179181.
A new slow response radiographic film (Kodak EDR) is compared with a more traditional faster responding dosimetry film (Kodak XV) in an intensity modulated radiation therapy x-ray field. Dose profiles derived from the two films are compared with doses obtained using a radiotherapy dose planning system (Philips-Pinnacle) which calculates planar dose using a collapsed cone convolution algorithm. Comparisons of the dose maps delivered from film with the Pinnacle dose maps are useful to ensure accurate dose delivery. The Pinnacle dose maps agreed with measurement using both film types to within +/- 3% (in the umbral region) at depths ranging from d(max) to 15 cm. Both XV and EDR films can be used to verify IMRT. EDR film is better suited for dosimetry for combined field dose maps due to its useful dose range of 1-5 Gy. We found XV to be more suitable for individual field dose maps (dose range 0-1 Gy) as no scaling of monitor units were required to achieve acceptable optical density response.
在调强放射治疗X射线野中，将一种新型慢响应放射成像胶片（柯达EDR）与一种更传统的快响应剂量测定胶片（柯达XV）进行比较。将从这两种胶片获得的剂量分布与使用放射治疗剂量计划系统（飞利浦-innacle）获得的剂量进行比较，该系统使用坍缩圆锥卷积算法计算平面剂量。将胶片提供的剂量图与innacle剂量图进行比较，有助于确保准确的剂量传递。在从d(max)到15 cm的深度范围内，innacle剂量图与使用两种胶片类型的测量结果在+/- 3%（在阈值区域）内一致。XV和EDR胶片均可用于验证调强放射治疗。EDR胶片因其1-5 Gy的有用剂量范围，更适合用于联合野剂量图的剂量测定。我们发现XV更适合用于单个野剂量图（剂量范围0-1 Gy），因为无需对监测单位进行缩放即可获得可接受的光学密度响应。
