光子计数计算机断层扫描中的虚拟非对比图像:不同对比相相的影响
Eva Laurin Gadsbøll1, Marie-Louise Aurumskjöld2,3, Fredrik Holmquist1,4
1Department of Imaging and Functional Medicine, Skåne University Hospital, Lund, Sweden.
Acta radiologica (Stockholm, Sweden : 1987)
|August 14, 2024
概括
从光子计数计算机断层扫描 (PCCT) 获得的虚拟非对比 (VNC) 图像与真实非对比 (TNC) 图像相比显示出显著差异,因组织类型而异. 由不同的对比相获得的VNC之间的差异是最小的.
科学领域:
- 医疗成像医学成像
- 放射学 放射学是一门学科.
- 光子计数计算机断层扫描
背景情况:
- 光子计数计算机断层扫描 (PCCT) 提供先进的图像重建,包括虚拟非对比 (VNC) 系列,与标准CT相比,潜在地提高分辨率和降低辐射剂量.
- 来自PCCT的VNC的临床应用和验证仍在出现.
研究的目的:
- 为了将来自对比增强扫描不同阶段产生的虚拟非对比 (VNC) 图像与真实非对比 (TNC) 图像进行比较.
- 使用临床批准的PCCT系统评估来自非增强,动脉和门静脉阶段的VNC系列.
主要方法:
- 用Naetom Alpha PCCT获得的45个三相腹部CT扫描的回顾性分析.
- 在各种组织 (肝脏,脏,大动脉,肌肉,脂肪) 中预定义的感兴趣区域中,对霍恩斯菲尔德单位 (HU) 和标准偏差 (SD) 的定量分析.
- 在VNC和TNC系列之间的HU差异 (ΔHU) 的统计比较.
主要成果:
- 在所有测量组织中,在VNC和TNC图像之间观察到HU值的显著差异.
- 最大的HU差异是在皮下脂肪中发现的,而最小的差异是在直立脊柱肌中发现的.
- 从动脉和门静脉阶段获得的VNC系列之间观察到极小的差异,肝脏辅酶体略有变化.
结论:
- 来自第一代PCCT的虚拟非对比图像与真实非对比图像相比显示出显著差异,其变化取决于组织组成.
- 对于生成VNC系列的对比相 (动脉与门静脉) 的选择对产生的图像值的影响有限.
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