Evaluation of a biplanar diode array dosimeter for quality assurance of step-and-shoot IMRT.
Evaluation of a biplanar diode array dosimeter for quality assurance of step-and-shoot IMRT.
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DOI：
10.1120/jacmp.v10i4.3080
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发表时间：
2009-09-30
影响因子：
2.1
通讯作者：
Nilsson G
中科院分区：
文献类型：
--
作者：
Feygelman V;Forster K;Opp D;Nilsson G
在本文中，我们描述和表征了一种新的双面二极管阵列，并证明了它在步进-发射IMRT的剂量定量QA中的适用性。它是第一个商业上可用的设备，其类型专门设计用于执行测量在不同的龙门架角度。该探测器由一个圆柱形PMMA模体和两个正交的探测器板组成。总共有1069个p型1毫米宽二极管探测器覆盖每个测量平面的测量区域。正交探测器阵列确保无论光束入射角如何，剂量调制信息都不会丢失。对于绝对校准，参考探测器的剂量由治疗计划系统在适当的SSD和放射深度计算，并根据测量的加速器输出进行缩放。在中心轴上直接测量的旋转响应显示，在以探测器板为中心的窄角间隔内，大约有最大的变化。这种变化被减少到小于四个类似中心的角间隔的外部。对于所有的探测器，对于一个有12束等间距光束的计划，测量剂量和计算剂量之间的差是。在11个IMRT方案中，10个方案的γ (3%,3 mm)≥95%，1个方案≥92%。双面二极管阵列是IMRT QA的一个有用工具，允许在3D中基本瞬时在线分析绝对剂量误差。PACS编号：87.55Qr
In this paper, we describe and characterize a novel biplanar diode array, and demonstrate its applicability to dosimetric QA of step‐and‐shoot IMRT. It is the first commercially available device of its kind specifically designed for performing measurements at varying gantry angles. The detector consists of a cylindrical PMMA phantom with two orthogonal detector boards. There are a total of 1069 p‐type 1 mm wide diode detectors covering the measurement area of in each of the measurement planes. The orthogonal detector arrays ensure that the dose modulation information is not lost regardless of the beam incidence angle. For absolute calibration, the dose to the reference detector is calculated at the appropriate SSD and radiological depth by the treatment planning system and is scaled by the measured accelerator output. The directly measured rotational response on the central axis shows the maximum variation of approximately in the narrow angular intervals centered on the detector boards. This variation is reduced to less than outside of the four similarly centered angular intervals. For all detectors, the difference between the measured and the calculated dose for a plan with 12 equally spaced beams is . Of eleven IMRT plans, ten passed the γ (3%,3 mm) criterion at or above 95%, while one passed at 92%. The biplanar diode array is a useful tool for IMRT QA, allowing for essentially instantaneous online analysis of absolute dose errors in 3D. PACS number: 87.55Qr
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影响因子：
3.8
作者：
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通讯作者：
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