L. Gallin-Martel, O. Rossetto, Y. Arnoud, B. Boyer, R. Delorme, R. Fabbro, M. Gallin-Martel, O. Guillaudin, A. Pélissier
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引用次数: 1
摘要
强度调制放射治疗允许在肿瘤中更有效的剂量传递，从而减少沉积在附近健康器官中的剂量。然而，这项技术需要额外的资源来进行在线剂量测定并确保患者的安全。研制了一种用于监测治疗x射线束的准透明二维透射探测器。它包括一个高性能的嵌入式电子元件，依赖于以CMOS 0.35 μm工艺设计的电荷到数字转换器。电荷平衡集成技术与内部6位模数转换器相结合，可以达到高分辨率和高动态范围。该16通道16位转换器具有6 fC LSB值，非线性优于0.1 LSB, RMS噪声低于0.5 LSB。
Design of a high dynamic range integrated charge to digital converter for online dosimetry in radiotherapy
The Intensity Modulated Radiotherapy allows a more efficient dose delivery in the tumour leading to a reduction of the dose deposited in the nearby healthy organs. However, this technique requires additional resources to perform on line dosimetry and insure patient safety. A quasi transparent 2D transmission detector for monitoring the treatment X-ray beam has been developed. It includes a high performance embedded electronics relying on a Charge to Digital Converter designed in a CMOS 0.35 μm process. The Charge Balancing Integration technique coupled to an internal 6-bit Analog to Digital Converter allows high resolution and high dynamic range to be reached. This 16-channel, 16-bit converter exhibits a 6 fC LSB value, a nonlinearity better than 0.1 LSB and a RMS noise lower than 0.5 LSB.
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