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Free-breathing qRF-MRF with pilot tone respiratory motion navigator for T1, T2, T2*, and off-resonance mapping of the human body at 3 T. 带有先导音呼吸运动导航仪的自由呼吸 qRF-MRF,用于 3 T 下人体的 T1、T2、T2* 和非共振绘图。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-16 DOI: 10.1007/s10334-024-01209-z
Madison E Kretzler, Sherry S Huang, Jessie E P Sun, Leonardo K Bittencourt, Yong Chen, Mark A Griswold, Rasim Boyacioglu

Standard quantitative abdominal MRI techniques are time consuming, require breath-holds, and are susceptible to patient motion artifacts. Magnetic resonance fingerprinting (MRF) is naturally multi-parametric and quantifies multiple tissue properties, including T1 and T2. This work includes T2* and off-resonance mapping into a free-breathing MRF framework utilizing a pilot tone navigator. The new acquisition and reconstruction are compared to current clinical standards. Prospective. Ten volunteers. 3 T scanner, Quadratic-RF MRF, Balanced SSFP, Inversion recovery spin-echo, LiverLab. MRI ROIs were evaluated in the liver, spleen, pancreas, kidney (cortex and medulla), and paravertebral muscle by two abdominal imaging investigators for ten healthy adult volunteers for clinical standard, breath-Hold (BH) qRF-MRF, and free-breathing qRF-MRF with pilot-tone (PT) acquisitions. Bland-Altman analysis as well as Student's T tests were used to evaluate and compare the respective ROI analyses. Quantitative values between breath-Hold (BH) and free-breathing qRF-MRF with pilot-tone (PT) results show good agreement with clinical standard T1 and T2 quantitative mapping, and Dixon q-VIBE (acquired using the Siemens LiverLAB). In this work, we show free-breathing abdominal MRF (T1, T2) with T2* results that are quantitatively comparable to current breath-hold MRF and clinical techniques.

标准的腹部磁共振成像定量技术耗时长,需要屏气,而且容易受到病人运动伪影的影响。磁共振指纹(MRF)具有天然的多参数特性,可量化多种组织属性,包括 T1 和 T2。这项研究利用先导音导航器将 T2* 和非共振映射纳入自由呼吸 MRF 框架。新的采集和重建与当前的临床标准进行了比较。前瞻性。十名志愿者。3 T 扫描仪、二次射频 MRF、平衡 SSFP、反转恢复自旋回波、LiverLab。两名腹部成像研究人员对 10 名健康成年志愿者的肝脏、脾脏、胰腺、肾脏(皮质和髓质)和椎旁肌的 MRI ROI 进行了评估,分别进行了临床标准、屏气(BH)qRF-MRF 和带有先导音(PT)采集的自由呼吸 qRF-MRF 采集。采用Bland-Altman分析和Student's T检验来评估和比较各自的ROI分析。屏气(BH)和带先导音(PT)的自由呼吸 qRF-MRF 结果之间的定量值与临床标准 T1 和 T2 定量绘图以及 Dixon q-VIBE(使用西门子 LiverLAB 采集)显示出良好的一致性。在这项工作中,我们展示了带有 T2* 的自由呼吸腹部 MRF(T1、T2)结果,其定量结果可与目前的屏气 MRF 和临床技术相媲美。
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引用次数: 0
MRI recovery with self-calibrated denoisers without fully-sampled data. 在没有全采样数据的情况下,使用自校准去噪器进行磁共振成像恢复。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-16 DOI: 10.1007/s10334-024-01207-1
Muhammad Shafique, Sizhuo Liu, Philip Schniter, Rizwan Ahmad

Objective: Acquiring fully sampled training data is challenging for many MRI applications. We present a self-supervised image reconstruction method, termed ReSiDe, capable of recovering images solely from undersampled data.

Materials and methods: ReSiDe is inspired by plug-and-play (PnP) methods, but unlike traditional PnP approaches that utilize pre-trained denoisers, ReSiDe iteratively trains the denoiser on the image or images that are being reconstructed. We introduce two variations of our method: ReSiDe-S and ReSiDe-M. ReSiDe-S is scan-specific and works with a single set of undersampled measurements, while ReSiDe-M operates on multiple sets of undersampled measurements and provides faster inference. Studies I, II, and III compare ReSiDe-S and ReSiDe-M against other self-supervised or unsupervised methods using data from T1- and T2-weighted brain MRI, MRXCAT digital perfusion phantom, and first-pass cardiac perfusion, respectively.

Results: ReSiDe-S and ReSiDe-M outperform other methods in terms of peak signal-to-noise ratio and structural similarity index measure for Studies I and II, and in terms of expert scoring for Study III.

Discussion: We present a self-supervised image reconstruction method and validate it in both static and dynamic MRI applications. These developments can benefit MRI applications where the availability of fully sampled training data is limited.

目的:对于许多核磁共振成像应用来说,获取完全采样的训练数据具有挑战性。我们提出了一种自监督图像重建方法,称为 ReSiDe,它能够仅从采样不足的数据中恢复图像:ReSiDe 受到即插即用(PnP)方法的启发,但与使用预训练去噪器的传统 PnP 方法不同的是,ReSiDe 是在正在重建的图像上反复训练去噪器。我们介绍了我们方法的两种变体:ReSiDe-S 和 ReSiDe-M。ReSiDe-S 是针对特定扫描的,只适用于单组欠采样测量,而 ReSiDe-M 则适用于多组欠采样测量,推理速度更快。研究 I、II 和 III 分别使用 T1 和 T2 加权脑磁共振成像、MRXCAT 数字灌注模型和第一通道心脏灌注的数据,将 ReSiDe-S 和 ReSiDe-M 与其他自监督或无监督方法进行了比较:在研究 I 和研究 II 中,ReSiDe-S 和 ReSiDe-M 在峰值信噪比和结构相似性指数测量方面优于其他方法;在研究 III 中,在专家评分方面优于其他方法:我们提出了一种自监督图像重建方法,并在静态和动态磁共振成像应用中进行了验证。这些研究成果可使磁共振成像应用受益匪浅,因为完全采样的训练数据是有限的。
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引用次数: 0
Accelerating multi-coil MR image reconstruction using weak supervision. 利用弱监督加速多线圈磁共振图像重建
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-09 DOI: 10.1007/s10334-024-01206-2
Arda Atalık, Sumit Chopra, Daniel K Sodickson

Deep-learning-based MR image reconstruction in settings where large fully sampled dataset collection is infeasible requires methods that effectively use both under-sampled and fully sampled datasets. This paper evaluates a weakly supervised, multi-coil, physics-guided approach to MR image reconstruction, leveraging both dataset types, to improve both the quality and robustness of reconstruction. A physics-guided end-to-end variational network (VarNet) is pretrained in a self-supervised manner using a 4 × under-sampled dataset following the self-supervised learning via data undersampling (SSDU) methodology. The pre-trained weights are transferred to another VarNet, which is fine-tuned using a smaller, fully sampled dataset by optimizing multi-scale structural similarity (MS-SSIM) loss in image space. The proposed methodology is compared with fully self-supervised and fully supervised training. Reconstruction quality improvements in SSIM, PSNR, and NRMSE when abundant training data is available (the high-data regime), and enhanced robustness when training data is scarce (the low-data regime) are demonstrated using weak supervision for knee and brain MR image reconstructions at 8 × and 10 × acceleration, respectively. Multi-coil physics-guided MR image reconstruction using both under-sampled and fully sampled datasets is achievable with transfer learning and fine-tuning. This methodology can provide improved reconstruction quality in the high-data regime and improved robustness in the low-data regime at high acceleration rates.

在无法收集大量全采样数据集的情况下,基于深度学习的磁共振图像重建需要同时有效利用欠采样和全采样数据集的方法。本文评估了一种弱监督、多线圈、物理引导的磁共振图像重建方法,利用这两种数据集来提高重建的质量和鲁棒性。采用数据欠采样自监督学习(SSDU)方法,使用 4 × 欠采样数据集,以自监督方式预训练物理引导的端到端变异网络(VarNet)。通过优化图像空间中的多尺度结构相似性(MS-SSIM)损失,使用较小的完全采样数据集对该数据集进行微调。所提出的方法与完全自我监督和完全监督训练进行了比较。在膝关节和脑部磁共振图像重建中,分别在 8 倍和 10 倍加速度下使用弱监督,证明了在有大量训练数据时(高数据机制),重建质量在 SSIM、PSNR 和 NRMSE 方面的改善,以及在训练数据稀缺时(低数据机制),鲁棒性的增强。通过迁移学习和微调,可以使用欠采样和全采样数据集进行多线圈物理引导磁共振图像重建。在高加速度下,这种方法可以提高高数据机制的重建质量和低数据机制的鲁棒性。
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引用次数: 0
Real-time automated quality control for quantitative MRI. 定量核磁共振成像的实时自动质量控制。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-03 DOI: 10.1007/s10334-024-01205-3
Andrew Dupuis, Rasim Boyacioglu, Kathryn E Keenan, Mark A Griswold

Objective: This work presents an automated quality control (QC) system within quantitative MRI (qMRI) workflows. By leveraging the ISMRM/NIST quantitative MRI system phantom, we establish an open-source pipeline for rapid, repeatable, and accurate validation and stability tracking of sequence quantification performance across diverse clinical settings.

Materials and methods: A microservice-based QC system for automated vial segmentation from quantitative maps was developed and tested across various MRF acquisition and protocol designs, with reports generated and returned to the scanner in real time.

Results: The system demonstrated consistent and repeatable value segmentation and reporting, successfully extracted all 252 T1 and T2 vial samples tested. Values extracted from the same sequence were found to be repeatable with 0.09% ± 1.23% and - 0.26% ± 2.68% intersession error, respectively.

Discussion: By providing real-time quantification performance assessment, this easily deployable automated QC approach streamlines sequence validation and long-term performance monitoring, vital for the broader acceptance of qMRI as a standard component of clinical protocols.

目的:本研究介绍了定量磁共振成像(qMRI)工作流程中的自动质量控制(QC)系统。通过利用 ISMRM/NIST 定量 MRI 系统模型,我们建立了一个开源管道,用于在不同临床环境中快速、可重复、准确地验证和跟踪序列量化性能的稳定性:我们开发了一个基于微型服务的质控系统,用于从定量图自动分割血瓶,并在各种 MRF 采集和方案设计中进行了测试,实时生成报告并返回扫描仪:结果:该系统展示了一致且可重复的数值分割和报告,成功提取了所有 252 个测试的 T1 和 T2 血瓶样本。从同一序列中提取的数值具有可重复性,其间误差分别为 0.09% ± 1.23% 和 - 0.26% ± 2.68%:通过提供实时量化性能评估,这种易于部署的自动质控方法简化了序列验证和长期性能监测,对于更广泛地接受 qMRI 作为临床方案的标准组成部分至关重要。
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引用次数: 0
Chitosan-modified manganese oxide-conjugated methotrexate nanoparticles delivering 5-aminolevulinic acid as a dual-modal T1-T2* MRI contrast agent in U87MG cell detection. 壳聚糖修饰的氧化锰共轭甲氨蝶呤纳米颗粒可作为双模态 T1-T2* 磁共振成像造影剂,用于 U87MG 细胞检测。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-01 Epub Date: 2024-05-25 DOI: 10.1007/s10334-024-01169-4
Yasin Ayyami, Marjan Ghorbani, Masoumeh Dastgir, Reza Malekzadeh, Tohid Mortezazadeh

Objective: Glioblastoma multiforme is a highly aggressive form of brain cancer, and early diagnosis plays a pivotal role in improving patient survival rates. In this regard, molecular magnetic resonance imaging has emerged as a promising imaging modality due to its exceptional sensitivity to minute tissue changes and the ability to penetrate deep into the brain. This study aimed to assess the efficacy of a novel contrast agent in detecting gliomas during MRI scans.

Materials and methods: The contrast agent utilized modified chitosan coating on manganese oxide nanoparticles. The modification included adding methotrexate and 5-aminolevulinic acid (MnO2/CS@5-ALA-MTX) to target cells with overexpressed folate receptors and breaking down excess hydrogen peroxide in tumor tissue, resulting in enhanced signal intensity in T1-weighted MR images but diminished signal intensity in T2*-weighted MR images.

Results: The nanosystem was characterized and evaluated in MR imaging, safety, and ability to target cells both in vivo and in vitro. MTX-free nanoparticles (MnO2/CS@5-ALA NPs) had no obvious cytotoxicity on cell lines U87MG and NIH3T3 after 24/48 h at a concentration of up to 160 µgr/mL (cell viability more than 80%). In this system, methotrexate enables tumor targeting and the MnO2/5-ALA improves T1-T2*-weighted MRI. In addition, MRI scans of mice with M109 carcinoma indicated significant tumor uptake and NP capacity to improve the positive contrast effect.

Conclusion: This developed MnO2/CS@5-ALA-MTX nanoparticle system may exhibit great potential in the accurate diagnosis of folate receptor over-expressing cancers such as glioblastoma.

目的:多形性胶质母细胞瘤是一种侵袭性极强的脑癌,早期诊断在提高患者生存率方面发挥着关键作用。在这方面,分子磁共振成像因其对微小组织变化的超高灵敏度和深入脑部的能力,已成为一种前景广阔的成像模式。本研究旨在评估一种新型造影剂在磁共振成像扫描中检测胶质瘤的效果:该造影剂在氧化锰纳米粒子上使用了改良壳聚糖涂层。改性包括添加甲氨蝶呤和 5-aminolevulinic acid(MnO2/CS@5-ALA-MTX)以靶向叶酸受体过度表达的细胞,并分解肿瘤组织中过量的过氧化氢,从而增强 T1 加权磁共振成像的信号强度,但减弱 T2* 加权磁共振成像的信号强度:结果:对该纳米系统进行了表征,并评估了其磁共振成像、安全性以及体内和体外靶向细胞的能力。不含 MTX 的纳米颗粒(MnO2/CS@5-ALA NPs)对细胞株 U87MG 和 NIH3T3 没有明显的细胞毒性。在该系统中,甲氨蝶呤可实现肿瘤靶向,而 MnO2/5-ALA 可改善 T1-T2* 加权磁共振成像。此外,对患有 M109 癌症的小鼠进行的核磁共振成像扫描显示,肿瘤摄取和 NP 能力显著提高了正对比效果:结论:所开发的 MnO2/CS@5-ALA-MTX 纳米粒子系统在准确诊断叶酸受体过度表达的癌症(如胶质母细胞瘤)方面具有巨大潜力。
{"title":"Chitosan-modified manganese oxide-conjugated methotrexate nanoparticles delivering 5-aminolevulinic acid as a dual-modal T1-T2* MRI contrast agent in U87MG cell detection.","authors":"Yasin Ayyami, Marjan Ghorbani, Masoumeh Dastgir, Reza Malekzadeh, Tohid Mortezazadeh","doi":"10.1007/s10334-024-01169-4","DOIUrl":"10.1007/s10334-024-01169-4","url":null,"abstract":"<p><strong>Objective: </strong>Glioblastoma multiforme is a highly aggressive form of brain cancer, and early diagnosis plays a pivotal role in improving patient survival rates. In this regard, molecular magnetic resonance imaging has emerged as a promising imaging modality due to its exceptional sensitivity to minute tissue changes and the ability to penetrate deep into the brain. This study aimed to assess the efficacy of a novel contrast agent in detecting gliomas during MRI scans.</p><p><strong>Materials and methods: </strong>The contrast agent utilized modified chitosan coating on manganese oxide nanoparticles. The modification included adding methotrexate and 5-aminolevulinic acid (MnO<sub>2</sub>/CS@5-ALA-MTX) to target cells with overexpressed folate receptors and breaking down excess hydrogen peroxide in tumor tissue, resulting in enhanced signal intensity in T<sub>1</sub>-weighted MR images but diminished signal intensity in T<sub>2</sub>*-weighted MR images.</p><p><strong>Results: </strong>The nanosystem was characterized and evaluated in MR imaging, safety, and ability to target cells both in vivo and in vitro. MTX-free nanoparticles (MnO<sub>2</sub>/CS@5-ALA NPs) had no obvious cytotoxicity on cell lines U87MG and NIH3T3 after 24/48 h at a concentration of up to 160 µgr/mL (cell viability more than 80%). In this system, methotrexate enables tumor targeting and the MnO<sub>2</sub>/5-ALA improves T<sub>1</sub>-T<sub>2</sub><sup>*</sup>-weighted MRI. In addition, MRI scans of mice with M109 carcinoma indicated significant tumor uptake and NP capacity to improve the positive contrast effect.</p><p><strong>Conclusion: </strong>This developed MnO<sub>2</sub>/CS@5-ALA-MTX nanoparticle system may exhibit great potential in the accurate diagnosis of folate receptor over-expressing cancers such as glioblastoma.</p>","PeriodicalId":18067,"journal":{"name":"Magnetic Resonance Materials in Physics, Biology and Medicine","volume":" ","pages":"909-924"},"PeriodicalIF":2.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141097209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Metabolic changes assessed by 1H MR spectroscopy in the corpus callosum of post-COVID patients. 通过 1H MR 光谱评估 COVID 后患者胼胝体的代谢变化。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-01 Epub Date: 2024-06-12 DOI: 10.1007/s10334-024-01171-w
Dita Pajuelo, Monika Dezortova, Milan Hajek, Marketa Ibrahimova, Ibrahim Ibrahim

Objective: Many patients with long COVID experience neurological and psychological symptoms. Signal abnormalities on MR images in the corpus callosum have been reported. Knowledge about the metabolic profile in the splenium of the corpus callosum (CCS) may contribute to a better understanding of the pathophysiology of long COVID.

Materials and methods: Eighty-one subjects underwent proton MR spectroscopy examination. The metabolic concentrations of total N-acetylaspartate (NAA), choline-containing compounds (Cho), total creatine (Cr), myo-inositol (mI), and NAA/Cho in the CCS were statistically compared in the group of patients containing 58 subjects with positive IgG COVID-19 antibodies or positive SARS-CoV-2 qPCR test at least two months before the MR and the group of healthy controls containing 23 subjects with negative IgG antibodies.

Results: An age-dependent effect of SARS-CoV-2 on Cho concentrations in the CCS has been observed. Considering the subjective threshold of age = 40 years, older patients showed significantly increased Cho concentrations in the CCS than older healthy controls (p = 0.02). NAA, Cr, and mI were unchanged. All metabolite concentrations in the CCS of younger post-COVID-19 patients remained unaffected by SARS-CoV-2. Cho did not show any difference between symptomatic and asymptomatic patients (p = 0.91).

Discussion: Our results suggest that SARS-CoV-2 disproportionately increases Cho concentration in the CCS among older post-COVID-19 patients compared to younger ones. The observed changes in Cho may be related to the microstructural reorganization in the CCS also reported in diffusion measurements rather than increased membrane turnover. These changes do not seem to be related to neuropsychological problems of the post-COVID-19 patients. Further metabolic studies are recommended to confirm these observations.

目的:许多长期胼胝体发育不良的患者会出现神经和心理症状。胼胝体磁共振图像上的信号异常已有报道。了解胼胝体脾脏(CCS)的代谢特征有助于更好地理解长COVID的病理生理学:81名受试者接受了质子磁共振光谱检查。统计比较了 CCS 中总 N-乙酰天冬氨酸(NAA)、含胆碱化合物(Cho)、总肌酸(Cr)、肌醇(mI)和 NAA/Cho 的代谢浓度,患者组中有 58 人在 MR 检查前至少两个月 COVID-19 IgG 抗体阳性或 SARS-CoV-2 qPCR 检测阳性,健康对照组中有 23 人 IgG 抗体阴性:结果:SARS-CoV-2对CCS中Cho浓度的影响与年龄有关。以年龄 = 40 岁为主观阈值,老年患者的 CCS 中 Cho 浓度明显高于老年健康对照组(p = 0.02)。而 NAA、Cr 和 mI 则没有变化。较年轻的后 COVID-19 患者 CCS 中的所有代谢物浓度均未受到 SARS-CoV-2 的影响。Cho在有症状和无症状的患者之间未显示出任何差异(p = 0.91):讨论:我们的研究结果表明,与年轻患者相比,SARS-CoV-2 会不成比例地增加 COVID-19 后老年患者 CCS 中的 Cho 浓度。观察到的 Cho 变化可能与扩散测量中也报告的 CCS 微结构重组有关,而不是膜周转的增加。这些变化似乎与后 COVID-19 患者的神经心理问题无关。建议进一步开展代谢研究,以证实这些观察结果。
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引用次数: 0
A straightforward procedure to build a non-toxic relaxometry phantom with desired T1 and T2 times at 3T. 在 3T 下构建具有所需 T1 和 T2 时间的无毒弛豫测量模型的直接程序。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-01 Epub Date: 2024-05-11 DOI: 10.1007/s10334-024-01166-7
Victor Fritz, Sabine Eisele, Petros Martirosian, Jürgen Machann, Fritz Schick

Objective: To prepare and analyze soy-lecithin-agar gels for non-toxic relaxometry phantoms with tissue-like relaxation times at 3T.

Methods: Phantoms mimicking the relaxation times of various tissues (gray and white matter, kidney cortex and medulla, spleen, muscle, liver) were built and tested with a clinical 3T whole-body MR scanner. Simple equations were derived to calculate the appropriate concentrations of soy lecithin and agar in aqueous solutions to achieve the desired relaxation times. Phantoms were tested for correspondence between measurements and calculated T1 and T2 values, reproducibility, spatial homogeneity, and temporal stability. T1 and T2 mapping techniques and a 3D T1-weighted sequence with high spatial resolution were applied.

Results: Except for the liver relaxation phantom, all phantoms were successfully and reproducibly produced. Good agreement was found between the targeted and measured relaxation times. The percentage deviations from the targeted relaxation times were less than 3% for T1 and less than 6.5% for T2. In addition, the phantoms were homogeneous and had little to no air bubbles. However, the phantoms were unstable over time: after a storage period of 4 weeks, mold growth and also changes in relaxation times were detected in almost all phantoms.

Conclusion: Soy-lecithin-agar gels are a non-toxic material for the construction of relaxometry phantoms with tissue-like relaxation times. They are easy to prepare, inexpensive and allow independent adjustment of T1 and T2. However, there is still work to be done to improve the long-term stability of the phantoms.

目的制备和分析大豆卵磷脂-琼脂凝胶,用于在 3T 下具有类似组织弛豫时间的无毒弛豫测量模型:方法:制作模拟各种组织(灰质和白质、肾皮质和髓质、脾脏、肌肉、肝脏)弛豫时间的模型,并使用临床 3T 全身磁共振扫描仪进行测试。通过计算水溶液中大豆卵磷脂和琼脂的适当浓度,得出了达到所需弛豫时间的简单方程。测试了测量值与计算出的 T1 和 T2 值之间的对应关系、再现性、空间均匀性和时间稳定性。应用了 T1 和 T2 映射技术以及具有高空间分辨率的三维 T1 加权序列:结果:除肝脏松弛模型外,所有模型都制作成功且重复性良好。目标弛豫时间与测量弛豫时间之间具有良好的一致性。T1 与目标弛豫时间的百分比偏差小于 3%,T2 小于 6.5%。此外,模型是均匀的,几乎没有气泡。然而,随着时间的推移,这些模型并不稳定:在储存 4 周后,几乎所有模型都出现了霉菌生长和松弛时间的变化:结论:大豆卵磷脂-琼脂凝胶是一种无毒材料,可用于制造具有类似组织弛豫时间的弛豫测量模型。它们易于制备,价格低廉,而且可以独立调节 T1 和 T2。不过,要提高模型的长期稳定性,还有很多工作要做。
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引用次数: 0
Towards retrospective motion correction and reconstruction for clinical 3D brain MRI protocols with a reference contrast. 为临床三维脑部磁共振成像方案的回溯运动校正和重建提供参考对比。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-01 Epub Date: 2024-05-17 DOI: 10.1007/s10334-024-01161-y
Gabrio Rizzuti, Tim Schakel, Niek R F Huttinga, Jan Willem Dankbaar, Tristan van Leeuwen, Alessandro Sbrizzi

Object: In a typical MR session, several contrasts are acquired. Due to the sequential nature of the data acquisition process, the patient may experience some discomfort at some point during the session, and start moving. Hence, it is quite common to have MR sessions where some contrasts are well-resolved, while other contrasts exhibit motion artifacts. Instead of repeating the scans that are corrupted by motion, we introduce a reference-guided retrospective motion correction scheme that takes advantage of the motion-free scans, based on a generalized rigid registration routine.

Materials and methods: We focus on various existing clinical 3D brain protocols at 1.5 Tesla MRI based on Cartesian sampling. Controlled experiments with three healthy volunteers and three levels of motion are performed.

Results: Radiological inspection confirms that the proposed method consistently ameliorates the corrupted scans. Furthermore, for the set of specific motion tests performed in this study, the quality indexes based on PSNR and SSIM shows only a modest decrease in correction quality as a function of motion complexity.

Discussion: While the results on controlled experiments are positive, future applications to patient data will ultimately clarify whether the proposed correction scheme satisfies the radiological requirements.

对象在一次典型的磁共振检查中,要采集多个对比度。由于数据采集过程的连续性,患者可能会在治疗过程中的某一时刻感到不适,并开始移动。因此,在磁共振扫描过程中,一些对比度分辨率较高,而另一些对比度则会出现运动伪影,这种情况十分常见。我们不需要重复扫描受运动干扰的图像,而是基于通用的刚性配准例程,引入一种参考引导的回溯运动校正方案,利用无运动的扫描图像:我们重点研究了各种基于笛卡尔采样的 1.5 特斯拉 MRI 临床三维脑成像方案。对三名健康志愿者和三种运动水平进行了对照实验:结果:放射学检查证实,所提出的方法能持续改善损坏的扫描结果。此外,对于本研究中进行的一组特定运动测试,基于 PSNR 和 SSIM 的质量指标显示,随着运动复杂度的增加,校正质量仅略有下降:尽管对照实验的结果是积极的,但未来在患者数据上的应用将最终明确所提出的校正方案是否满足放射学要求。
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引用次数: 0
Diffusion weighted imaging combining respiratory triggering and navigator echo tracking in the upper abdomen. 结合呼吸触发和导航回波跟踪的上腹部弥散加权成像。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-01 Epub Date: 2024-02-24 DOI: 10.1007/s10334-024-01150-1
Yoshihiko Tachikawa, Hiroshi Hamano, Naoya Chiwata, Hikaru Yoshikai, Kento Ikeda, Yasunori Maki, Yukihiko Takahashi, Makiko Koike

Objectives: To evaluate a new motion correction method, named RT + NV Track, for upper abdominal DWI that combines the respiratory triggering (RT) method using a respiration sensor and the Navigator Track (NV Track) method using navigator echoes.

Materials and methods: To evaluate image quality acquired upper abdominal DWI and ADC images with RT, NV, and RT + NV Track in 10 healthy volunteers and 35 patients, signal-to-noise efficiency (SNRefficiency) and the coefficient of variation (CV) of ADC values were measured. Five radiologists independently performed qualitative image-analysis assessments.

Results: RT + NV Track showed significantly higher SNRefficiency than RT and NV (14.01 ± 4.86 vs 12.05 ± 4.65, 10.05 ± 3.18; p < 0.001, p < 0.001). RT + NV Track was superior to RT and equal or better quality than NV in CV and visual evaluation of ADC values (0.033 ± 0.018 vs 0.080 ± 0.042, 0.057 ± 0.034; p < 0.001, p < 0.001). RT + NV Track tends to acquire only expiratory data rather than NV, even in patients with relatively rapid breathing, and can correct for respiratory depth variations, a weakness of RT, thus minimizing image quality degradation.

Conclusion: The RT + NV Track method is an efficient imaging method that combines the advantages of both RT and NV methods in upper abdominal DWI, providing stably good images in a short scan time.

目的评估一种新的上腹部 DWI 运动校正方法(RT + NV Track),该方法结合了使用呼吸传感器的呼吸触发(RT)方法和使用导航器回波的导航器追踪(NV Track)方法:为了评估在 10 名健康志愿者和 35 名患者中使用 RT、NV 和 RT + NV Track 获得的上腹部 DWI 和 ADC 图像的质量,测量了信噪比效率(SNRefficiency)和 ADC 值的变异系数(CV)。五位放射科医生独立进行了定性图像分析评估:结果:RT + NV Track 的 SNRefficiency 明显高于 RT 和 NV(14.01 ± 4.86 vs 12.05 ± 4.65、10.05 ± 3.18;P 结论:RT + NV Track 是一种有效的诊断方法:RT + NV Track 方法是一种高效的成像方法,它结合了 RT 和 NV 方法在上腹部 DWI 中的优点,能在较短的扫描时间内提供稳定的良好图像。
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引用次数: 0
Impact of truncating diffusion MRI scans on diffusional kurtosis imaging. 截断弥散核磁共振成像扫描对弥散峰度成像的影响。
IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Pub Date : 2024-10-01 Epub Date: 2024-02-23 DOI: 10.1007/s10334-024-01153-y
Ana R Fouto, Rafael N Henriques, Marc Golub, Andreia C Freitas, Amparo Ruiz-Tagle, Inês Esteves, Raquel Gil-Gouveia, Nuno A Silva, Pedro Vilela, Patrícia Figueiredo, Rita G Nunes

Objective: Diffusional kurtosis imaging (DKI) extends diffusion tensor imaging (DTI), characterizing non-Gaussian diffusion effects but requires longer acquisition times. To ensure the robustness of DKI parameters, data acquisition ordering should be optimized allowing for scan interruptions or shortening. Three methodologies were used to examine how reduced diffusion MRI scans impact DKI histogram-metrics: 1) the electrostatic repulsion model (OptEEM); 2) spherical codes (OptSC); 3) random (RandomTRUNC).

Materials and methods: Pre-acquired diffusion multi-shell data from 14 female healthy volunteers (29±5 years) were used to generate reordered data. For each strategy, subsets containing different amounts of the full dataset were generated. The subsampling effects were assessed on histogram-based DKI metrics from tract-based spatial statistics (TBSS) skeletonized maps. To evaluate each subsampling method on simulated data at different SNRs and the influence of subsampling on in vivo data, we used a 3-way and 2-way repeated measures ANOVA, respectively.

Results: Simulations showed that subsampling had different effects depending on DKI parameter, with fractional anisotropy the most stable (up to 5% error) and radial kurtosis the least stable (up to 26% error). RandomTRUNC performed the worst while the others showed comparable results. Furthermore, the impact of subsampling varied across distinct histogram characteristics, the peak value the least affected (OptEEM: up to 5% error; OptSC: up to 7% error) and peak height (OptEEM: up to 8% error; OptSC: up to 11% error) the most affected.

Conclusion: The impact of truncation depends on specific histogram-based DKI metrics. The use of a strategy for optimizing the acquisition order is advisable to improve DKI robustness to exam interruptions.

目的:扩散峰度成像(DKI)是对扩散张量成像(DTI)的扩展,可描述非高斯扩散效应,但需要较长的采集时间。为确保 DKI 参数的稳健性,应优化数据采集顺序,允许中断或缩短扫描时间。我们采用了三种方法来研究减少扩散 MRI 扫描对 DKI 直方图指标的影响:1) 静电排斥模型 (OptEEM);2) 球形编码 (OptSC);3) 随机 (RandomTRUNC):使用预先获得的 14 名女性健康志愿者(29±5 岁)的扩散多壳数据生成重新排序的数据。每种策略都会生成包含不同数量完整数据集的子集。通过基于道的空间统计(TBSS)骨架图,评估了基于直方图的 DKI 指标的子采样效果。为了评估每种子取样方法在不同信噪比下对模拟数据的影响,以及子取样对体内数据的影响,我们分别使用了 3 向和 2 向重复测量方差分析:模拟结果表明,子取样会因 DKI 参数的不同而产生不同的影响,其中分数各向异性最稳定(误差不超过 5%),径向峰度最不稳定(误差不超过 26%)。RandomTRUNC 的表现最差,而其他参数的表现不相上下。此外,子采样对不同直方图特征的影响也不同,峰值受影响最小(OptEEM:误差达 5%;OptSC:误差达 7%),峰高受影响最大(OptEEM:误差达 8%;OptSC:误差达 11%):结论:截断的影响取决于基于直方图的特定 DKI 指标。结论:截断的影响取决于特定的基于直方图的 DKI 指标,最好采用优化采集顺序的策略,以提高 DKI 对检查中断的稳健性。
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引用次数: 0
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Magnetic Resonance Materials in Physics, Biology and Medicine
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