AGFA PACS software supported CT, MRI and PET windows impact on object appearances and size: phantom study

2020 Advances in Science and Engineering Technology International Conferences (ASET) Pub Date : 2020-02-01 DOI:10.1109/ASET48392.2020.9118357

Entesar Zawam Dalah, Hana Abdel Hamed Elshahawy, Asma Mohamed Abdi, H. Elmehdi, W. Zgallai

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Abstract

The aim of the present work is to assess the effect of window width and window level selection on feature size in a 2D displayed multimodality images. DICOM images of CT, MR and PET were retrieved and retrospectively analyzed using a local PACS system running an image manipulation software AGFA NX v2.0 that supports several windows for each image modality. The images analyzed were phantom based using standardized NEMA ICE body phantom that consist of six fillable variable spheres sizes. A NOVA t-test was used for statistical difference studies. Using bone and abdomen/ pelvis CT windows resulted in a sphere underestimation of up to 3 mm. While using T1 and T2 MRI windows yielded an underestimation of up to 3.5 mm especially in the small spheres. Significant spheres size differences were seen with PET windows shown an overestimation of up to 7 mm using CE equal and thermal windows. Improper selection of windowing while viewing 2D displayed images can yield considerable inconsistency leading to unreliable measurement.

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AGFA PACS软件支持CT, MRI和PET窗口对物体外观和大小的影响:幻影研究

本研究的目的是评估窗口宽度和窗口水平选择对二维显示多模态图像特征大小的影响。检索CT、MR和PET的DICOM图像，并使用本地PACS系统进行回顾性分析，该系统运行图像处理软件AGFA NX v2.0，该软件支持每种图像模态的多个窗口。所分析的图像是基于标准化NEMA ICE体幻影的，该体幻影由六个可填充的可变球体大小组成。统计学差异研究采用NOVA t检验。使用骨和腹部/骨盆CT窗口导致球体低估达3mm。当使用T1和T2 MRI窗口时，特别是在小球体中，产生了高达3.5 mm的低估。在PET窗口中可以看到显著的球体大小差异，使用CE等温窗和热窗时，球体大小的高估可达7毫米。在观看2D显示图像时，窗口选择不当会产生相当大的不一致性，从而导致不可靠的测量。

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2020 Advances in Science and Engineering Technology International Conferences (ASET)

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