Improved geometric accuracy of whole body diffusion-weighted imaging at 1.5T and 3T using reverse polarity gradients.
Improved geometric accuracy of whole body diffusion-weighted imaging at 1.5T and 3T using reverse polarity gradients.
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DOI：
10.1038/s41598-022-15872-6
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发表时间：
2022-07-08
影响因子：
4.6
通讯作者：
Malmberg, F.
中科院分区：
文献类型：
--
作者：
Sjoholm, T.;Kullberg, J.;Strand, R.;Engstrom, M.;Ahlstrom, H.;Malmberg, F.
全身弥散加权成像（WB-DWI）越来越多地用于肿瘤学应用，但由于磁致伸缩性引起的几何失真而遭受未对准。因此，在同一扫描会话中采集的DWI和结构图像在几何上不对齐，导致例如病变检测和分割的困难。在这项工作中，我们评估的性能的反向极性梯度（RPG）方法校正WB-DWI几何失真。在1.5T（n = 20）和3 T（n = 20）下采集健康对照者的多站DWI和结构磁共振成像（MRI）数据。基于B = 0 s/mm 2（b 0）和B = 50 s/mm 2（b50）DWI采集，使用RPG方法对DWI数据进行失真校正。低b值DWI和结构数据之间的互信息（MI）随着失真校正而增加（P < 0.05），而基于感兴趣区（ROI）的相似性度量的改善，比较DWI和结构数据上偶然发现的位置，是位置依赖性的。测量未校正和失真校正的表观扩散系数（ADC）值之间的小数值差异。从视觉上看，失真校正改善了工作站边界处的脊柱对齐，但主要针对脾脏和肾脏引入了基于配准的伪影。总体而言，RPG失真校正提高了在1.5T和3 T下采集的WB-DWI数据的几何精度。基于b 0和b50的失真校正具有非常相似的性能。
Whole body diffusion-weighted imaging (WB-DWI) is increasingly used in oncological applications, but suffers from misalignments due to susceptibility-induced geometric distortion. As such, DWI and structural images acquired in the same scan session are not geometrically aligned, leading to difficulties in e.g. lesion detection and segmentation. In this work we assess the performance of the reverse polarity gradient (RPG) method for correction of WB-DWI geometric distortion. Multi-station DWI and structural magnetic resonance imaging (MRI) data of healthy controls were acquired at 1.5T (n = 20) and 3T (n = 20). DWI data was distortion corrected using the RPG method based on b = 0 s/mm2 (b0) and b = 50 s/mm2 (b50) DWI acquisitions. Mutual information (MI) between low b-value DWI and structural data increased with distortion correction (P < 0.05), while improvements in region of interest (ROI) based similarity metrics, comparing the position of incidental findings on DWI and structural data, were location dependent. Small numerical differences between non-corrected and distortion corrected apparent diffusion coefficient (ADC) values were measured. Visually, the distortion correction improved spine alignment at station borders, but introduced registration-based artefacts mainly for the spleen and kidneys. Overall, the RPG distortion correction gave an improved geometric accuracy for WB-DWI data acquired at 1.5T and 3T. The b0- and b50-based distortion corrections had a very similar performance.
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DOI：
10.1259/bjr.20170577
发表时间：
2018-01
期刊：
The British journal of radiology
影响因子：
--
作者：
Barnes A;Alonzi R;Blackledge M;Charles-Edwards G;Collins DJ;Cook G;Coutts G;Goh V;Graves M;Kelly C;Koh DM;McCallum H;Miquel ME;O'Connor J;Padhani A;Pearson R;Priest A;Rockall A;Stirling J;Taylor S;Tunariu N;van der Meulen J;Walls D;Winfield J;Punwani S
通讯作者：
Punwani S
影响因子：
3.3
作者：
Dzyubachyk, Oleh;Staring, Marius;van der Geest, Rob J.
通讯作者：
van der Geest, Rob J.
影响因子：
8.9
作者：
Petralia, Giuseppe;Padhani, Anwar R.;Bellomi, Massimo
通讯作者：
Bellomi, Massimo
影响因子：
3.3
作者：
JEZZARD, P;BALABAN, RS
通讯作者：
BALABAN, RS
影响因子：
4.4
作者：
Arlinghaus, Lori R.;Welch, E. Brian;Chakravarthy, A. Bapsi;Xu, Lei;Farley, Jaime S.;Abramson, Vandana G.;Grau, Ana M.;Kelley, Mark C.;Mayer, Ingrid A.;Means-Powell, Julie A.;Meszoely, Ingrid M.;Gore, John C.;Yankeelov, Thomas E.
通讯作者：
Yankeelov, Thomas E.