心脏MRI伪影:影像学表现及解决方法。

IF 5.2 1区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Radiographics Pub Date : 2025-01-01 DOI:10.1148/rg.230200
Prabhakar Shantha Rajiah, Baskaran Sundaram, Ming Yen Ng, Praveen Ranganath, Philip A Araoz, Michael A Bolen
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引用次数: 0

摘要

心脏磁共振成像(CMR)是评价心血管疾病的重要影像学手段。CMR图像获取在技术上是具有挑战性的,在某些情况下,它与人工制品相关联,既有一般的,也有序列特定的。识别成像伪影,了解其原因,并应用有效的伪影缓解方法对于成功的CMR至关重要。平衡稳态自由进动(bSSFP)是最常见的CMR序列,它与带和流伪影有关,在3-T成像中被放大。这可以通过有针对性的调光、短的重复时间或使用频率侦察序列来减轻。对于心律失常或憋气不良的患者,采用非心电图门控的自由呼吸实时序列可以提高影像质量。采用运动补偿和信号平均的单次成像技术可以减轻晚期钆增强(LGE)图像上的运动伪影。LGE图像也容易出现部分体积平均和不完全心肌零化。在相衬成像中,当血流速度高于编码速度时,会出现混叠现象。可以通过提高编码速度或使用后处理软件来减轻混叠。在第一次灌注成像中,由于吉布斯环引起的暗边缘伪影可以根据早期的外观和几个心动周期后的消退与真正的灌注缺陷区分开来。对于植入的心脏装置,在LGE图像上可以看到人造的高信号强度模拟疤痕,可以使用宽带序列来减轻。对于器件和金属伪影,传统的梯度召回回波序列比bSSFP具有更少的伪影。3t的CMR需要适应序列以最小化伪影。©RSNA, 2025本文可获得补充材料。
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Artifacts at Cardiac MRI: Imaging Appearances and Solutions.

Cardiac MRI (CMR) is an important imaging modality in the evaluation of cardiovascular diseases. CMR image acquisition is technically challenging, which in some circumstances is associated with artifacts, both general as well as sequence specific. Recognizing imaging artifacts, understanding their causes, and applying effective approaches for artifact mitigation are critical for successful CMR. Balanced steady-state free precession (bSSFP), the most common CMR sequence, is associated with band and flow artifacts, which are amplified at 3-T imaging. This can be mitigated by targeted shimming, by short repetition time, or by using a frequency-scout sequence. In patients with cardiac arrhythmias or poor breath hold, the quality of cine imaging can be improved with a non-electrocardiographically gated free-breathing real-time sequence. Motion artifacts on late gadolinium enhancement (LGE) images can be mitigated by using single-shot technique with motion compensation and signal averaging. LGE images are also prone to partial-volume averaging and incomplete myocardial nulling. In phase-contrast imaging, aliasing artifact is seen when the velocity of blood is higher than the encoded velocity. Aliasing can be mitigated by increasing the encoded velocity or using postprocessing software. In first-pass perfusion imaging, a dark rim artifact due to Gibbs ringing can be distinguished from a true perfusion defect based on earlier appearance and fading after a few cardiac cycles. With implanted cardiac devices, artifactual high signal intensity mimicking scar is seen on LGE images, which can be mitigated using a wide-band sequence. With devices and metallic artifacts, traditional gradient-recalled echo sequence has fewer artifacts than bSSFP. CMR at 3 T requires adaptation of sequences to minimize artifacts. ©RSNA, 2025 Supplemental material is available for this article.

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来源期刊
Radiographics
Radiographics 医学-核医学
CiteScore
8.20
自引率
5.50%
发文量
224
审稿时长
4-8 weeks
期刊介绍: Launched by the Radiological Society of North America (RSNA) in 1981, RadioGraphics is one of the premier education journals in diagnostic radiology. Each bimonthly issue features 15–20 practice-focused articles spanning the full spectrum of radiologic subspecialties and addressing topics such as diagnostic imaging techniques, imaging features of a disease or group of diseases, radiologic-pathologic correlation, practice policy and quality initiatives, imaging physics, informatics, and lifelong learning. A special issue, a monograph focused on a single subspecialty or on a crossover topic of interest to multiple subspecialties, is published each October. Each issue offers more than a dozen opportunities to earn continuing medical education credits that qualify for AMA PRA Category 1 CreditTM and all online activities can be applied toward the ABR MOC Self-Assessment Requirement.
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