在基于CdTe的临床光子计数计算机断层扫描中探索脉冲堆积效应
Mridul Bhattarai1,2,3, Steve Bache4, Ehsan Abadi1,2,3
1Medical Physics Graduate Program, Duke University, Durham, North Carolina, USA.
光子计数CT (PCCT) 中的高管电流对图像质量的影响最小,空间分辨率不受影响. 脉冲堆积效应在常规临床实践中可以忽略不计,确保可靠的性能.
科学领域:
- 医学成像物理 医学成像物理
- 辐射技术 辐射技术
- 光子计数探测器技术的技术
背景情况:
- 由增加的管流引起的高X射线流量可能会导致光子计数探测器 (PCD) 中的脉冲堆积.
- 脉冲堆积可能导致计数损失和降低能量分辨率,可能影响图像质量.
研究的目的:
- 评估在高流量条件下临床光子计数CT (PCCT) 系统的性能.
- 评估潜在的脉冲堆积效应对任务通用图像质量指标的影响.
主要方法:
- 在西门子NAEOTOM Alpha PCCT扫描仪上,在14个管道电流水平 (40-1000 mA) 上以120kV的电压扫描了一个临床幻影.
- 图像质量指标包括噪声功率频谱 (NPS),任务转移函数 (TTF),对比度与噪声比率 (CNR) 和CT数量.
- 重建是使用一个非代算法 (QIR-off) 和一个Br44内核进行的.
主要成果:
- 空间分辨率 (TFT的f50) 在不同的管流中保持不变.
- 测量的噪声大小高于最高管电流预期的高达11.1%.
- CT数量显示微小的变化,而CNR单调增加;与预期值的偏差在-6%至12%之间.
结论:
- 增加的管流对临床PCCT系统中的空间分辨率和CT数量的影响最小.
- 观察到的对噪声的影响仅在临床上无关的高管电流下显著.
- 脉冲堆积效应在常规临床实践中是可以忽略不计的,因为系统纠正或短检测器死亡时间.
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