两个采用线性和2D反散射网格的全息数字造 mammography 系统的物理图像质量的比较
Craig S Moore1, Tim J Wood1,2, John R Saunderson1
1Medical Physics Department, Queen's Centre for Oncology and Haematology, Castle Hill Hospital, Hull University Teaching Hospitals NHS Trust, Castle Road, Hull, HU16 5JQ, United Kingdom.
Biomedical physics & engineering express
|July 20, 2023
概括
在Hologic乳房造影系统中的2D反散射网格,与线性网格相比,提供更优质的图像质量. 为了匹配图像质量,线性网格需要增加剂量,尽管它仍然在安全范围内.
科学领域:
- 医学成像物理 医学成像物理
- 辐射技术 辐射技术
背景情况:
- 霍利奇全场数字造乳镜 (FFDM) 系统使用2D或线性反散射网格.
- 制造商声称,在配对剂量时,网格之间的图像质量可以比较.
研究的目的:
- 评估制造商关于剂量中立性和可比图像质量的声明.
- 通过使用先进的图像质量指标,评估使用2D和线性网格的Hologic FFDM系统.
主要方法:
- 测量了有效侦探量子效率 (eDQE),有效噪声等效量 (eNEQ) 和有效剂量效率 (eDE).
- 使用了不同厚度 (2-7厘米) 的聚 (甲基甲酸) (PMMA) 幻影.
- 在相同的光束条件下比较Hologic Dimensions (2D网格) 和Hologic 3Dimensions (线性网格) FFDM系统.
主要成果:
- 与线性网格相比,2D网格在所有空间频率上表现出优异的性能.
- 匹配eNEQ需要对线性网格的平均腺体剂量 (MGD) 增加高达38%.
- 这两种网格在成像微妙的病变和微型化时都表现出类似的效率.
结论:
- 2D网格提供了比Hologic FFDM系统中的线性网格更好的图像质量.
- 对线性网格来说,剂量调整是必要的,以实现与2D网格相比较的图像质量.
- 这些发现有助于医学物理学家优化和标准化Hologic FFDM单元.
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