一种实用的方法来模拟真实的减少暴露的CT图像,通过添加计算产生的噪声。

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Radiological Physics and Technology Pub Date : 2024-03-01 Epub Date: 2023-11-13 DOI:10.1007/s12194-023-00755-w
Nicholas Mark Gibson, Amy Lee, Martin Bencsik
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引用次数: 0

摘要

应优化计算机断层扫描(CT)扫描方案,以尽量减少成像所需的辐射剂量。在CT图像中加入计算产生的噪声有助于降低剂量。本研究的目的是开发一种噪声添加方法,该方法只需要医学数字成像和通信(DICOM)图像作为输入数据和常用的用于校准的图像,即可再现临床图像中存在的噪声纹理的复杂性,并且根据潜在解剖结构的方向性在图像上有所不同。该方法基于对图像进行正投影、加入泊松噪声和重建新图像来估计投影数据。将该方法应用于从圆柱形和胸椎幻影中获取的图像,使用曝光高达49 ma的源图像和39至5 ma的目标图像,验证了该方法的有效性。对生成的低剂量图像中感兴趣的区域导出二维噪声谱,并与扫描仪获取的低剂量图像进行比较。噪声标准差的均方根差为4%,除了圆柱形幻影外围区域的极低暴露。来自相应感兴趣区域的噪声谱显示出显著的一致性,表明再现了噪声的复杂性质。提出了一种实用的CT图像加噪方法,并对噪声的大小和光谱含量进行了验证。该方法可用于优化CT成像。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A practical method to simulate realistic reduced-exposure CT images by the addition of computationally generated noise.

Computed tomography (CT) scanning protocols should be optimized to minimize the radiation dose necessary for imaging. The addition of computationally generated noise to the CT images facilitates dose reduction. The objective of this study was to develop a noise addition method that reproduces the complexity of the noise texture present in clinical images with directionality that varies over images according to the underlying anatomy, requiring only Digital Imaging and Communications in Medicine (DICOM) images as input data and commonly available phantoms for calibration. The developed method is based on the estimation of projection data by forward projection from images, the addition of Poisson noise, and the reconstruction of new images. The method was validated by applying it to images acquired from cylindrical and thoracic phantoms using source images with exposures up to 49 mAs and target images between 39 and 5 mAs. 2D noise spectra were derived for regions of interest in the generated low-dose images and compared with those from the scanner-acquired low-dose images. The root mean square difference between the standard deviations of noise was 4%, except for very low exposures in peripheral regions of the cylindrical phantom. The noise spectra from the corresponding regions of interest exhibited remarkable agreement, indicating that the complex nature of the noise was reproduced. A practical method for adding noise to CT images was presented, and the magnitudes of noise and spectral content were validated. This method may be used to optimize CT imaging.

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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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