Fine-tuning the H-scan for discriminating changes in tissue scatterers.
Fine-tuning the H-scan for discriminating changes in tissue scatterers.
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DOI：
10.1088/2057-1976/ab9206
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发表时间：
2020-05-20
影响因子：
1.4
通讯作者：
Baek J
中科院分区：
文献类型：
--
作者：
Parker KJ;Baek J
H扫描方法(‘H’表示色调，或Hermite)是一种最新的匹配滤波法，旨在为传统的超声B超增加信息。这一理论是基于不同类别的反射体或散射体产生的回波的差异。可以为不同类型的散射体创建匹配过滤器，由此最大输出指示匹配，并且可以使用配色方案来指示负责回波的散射体的类别，从而提供结果的可视解释。然而，在各种形状的弱散射理论中，非均匀物体大小的微小变化将导致散射传递函数的位移。在这篇文章中，我们认为一般的幂定律传递函数作为大多数正常软血管组织传递函数的典范模型，至少在入射脉冲照射的某些带通频谱上是这样的。在散射体大小和分布发生变化的情况下，这会在中心频率以及回波的时间和频域特性中产生相应的移位，并由匹配的滤波器捕获这些特性，以区分和显示散射类型的主要特征。通过这种通用的方法，H扫描匹配滤光片可以被设置为在散射类型中引起更细微的颗粒移位，与组织形态中更细微的变化相称。补偿随频率变化的衰减有助于避免波束随深度增加而软化的影响。从体模、正常组织和病理组织的实例中可以看出，H扫描分析和显示对散射体的大小和形态很敏感，并且可以适用于传统的成像系统。
The H-scan approach (‘H’ denoting hue, or Hermite) is a recent matched filter methodology that aims to add information to the traditional ultrasound B-scan. The theory is based on the differences in the echoes produced by different classes of reflectors or scatterers. Matched filters can be created for different types of scatterers, whereby the maximum output indicates a match, and color schemes can be used to indicate the class of scatterer responsible for echoes, providing a visual interpretation of the results. However, within the theory of weak scattering from a variety of shapes, small changes in the size of the inhomogeneous objects will create shifts in the scattering transfer function. In this paper, we argue for a general power law transfer function as the canonical model for transfer functions from most normal soft vascularized tissues, at least over some bandpass spectrum illuminated by the incident pulse. In cases where scatterer size and distributions change, this produces a corresponding shift in center frequency, along with time and frequency domain characteristics of echoes, and these are captured by matched filters to distinguish and visualize in color the major characteristics of scattering types. With this general approach, the H-scan matched filters can be set to elicit more fine grain shifts in scattering types, commensurate with more subtle changes in tissue morphology. Compensation for frequency dependent attenuation is helpful for avoiding beam softening effects with increasing depths. Examples from phantoms and normal and pathological tissues are provided to demonstrate that the H-scan analysis and displays are sensitive to scatterer size and morphology, and can be adapted to conventional imaging systems.
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DOI：
10.1117/1.jmi.5.1.013505
发表时间：
2018-01
期刊：
Journal of medical imaging (Bellingham, Wash.)
影响因子：
--
作者：
Ge GR;Laimes R;Pinto J;Guerrero J;Chavez H;Salazar C;Lavarello RJ;Parker KJ
通讯作者：
Parker KJ
影响因子：
2.4
作者：
CAMPBELL, JA;WAAG, RC
通讯作者：
WAAG, RC
DOI：
10.1109/58.4146
发表时间：
1988-01-01
影响因子：
3.6
作者：
GALLOWAY, RL;MCDERMOTT, BA;THURSTONE, FL
通讯作者：
THURSTONE, FL
影响因子：
3.5
作者：
GORE, JC;LEEMAN, S
通讯作者：
LEEMAN, S
影响因子：
2.6
作者：
Astheimer, Jeffrey P.;Parker, Kevin J.
通讯作者：
Parker, Kevin J.