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首页> 外文期刊>Journal of Neuroscience Methods >Image manipulation and error estimation for MRI analysis.
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Image manipulation and error estimation for MRI analysis.

机译:用于MRI分析的图像处理和误差估计。

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摘要

Manipulation of MRI images prior to volumetric analysis is a common practice that may unwittingly lead to errors in measurement. In this study, we examine the effects of two types of image manipulation: changes in the total number of slices used to obtain volume estimates (slice sampling rate) and image rotation. A phantom containing two regularly-shaped and two irregularly-shaped regions of interest (ROIs) was scanned using an SPGR sequence and 1-mm slices. Changes in slice sampling rate produced marked effects on volume estimation of irregularly-shaped ROls. Comparatively little error was associated with changes in slice sampling rates for regularly-shaped ROIs. In addition, there was an interaction between image rotation in non-orthogonal planes and slice sampling rate. The data suggests that the ability to detect anatomical effects may be influenced by an investigator's choices concerning the number of slices included in a region of interest and image rotation when estimating volumes.
机译:在体积分析之前对MRI图像进行处理是一种常见的做法,可能会无意间导致测量错误。在这项研究中,我们研究了两种图像处理的效果:用于获取体积估计值(切片采样率)的切片总数的变化和图像旋转。使用SPGR序列和1-mm切片扫描包含两个规则形状和两个不规则形状的感兴趣区域(ROI)的模型。切片采样率的变化对不规则形状的滚动体的体积估计产生显着影响。相对较小的误差与规则形状的ROI的切片采样率变化相关。另外,在非正交平面中的图像旋转与切片采样率之间存在相互作用。数据表明,检测解剖效果的能力可能受研究人员在估计体积时有关感兴趣区域中包含的切片数量和图像旋转的选择的选择影响。

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