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Rapid MR imaging. 快速磁共振成像。
Magnetic resonance annual
Pub Date : 1988-01-01
R R Edelman, R B Buxton, T J Brady

During the past few years major improvements have been made in MR systems resulting in increased S/N, which is now being traded for more rapid imaging times. As discussed, there are three general strategies to decrease acquisition time and more will likely surface. Gradient-echo imaging, which has provided the most clinical experience to date, can be used for rapid imaging, functional studies and unique contrast mechanisms such as susceptibility imaging. While the contrast mechanisms and ultimate clinical utility require further study, it seems likely that gradient-echo imaging will become a routine part of clinical MR imaging.

在过去几年中，MR系统取得了重大改进，导致信噪比增加，现在正在以更快的成像时间为代价。如前所述，有三种减少获取时间的一般策略，并且可能会出现更多策略。梯度回声成像迄今为止提供了最多的临床经验，可用于快速成像，功能研究和独特的对比机制，如敏感性成像。虽然对比机制和最终的临床应用需要进一步的研究，但似乎梯度回声成像将成为临床磁共振成像的常规部分。
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引用次数: 0
Magnetic resonance imaging of the sella and temporal bone. 鞍骨和颞骨的磁共振成像。
Magnetic resonance annual
Pub Date : 1987-01-01
D L Daniels, V M Haughton
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引用次数: 0
Magnetic resonance angiography. 磁共振血管造影。
Magnetic resonance annual
Pub Date : 1987-01-01
V J Wedeen, B R Rosen, T J Brady
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引用次数: 0
Magnetic resonance imaging of the female pelvis. 女性骨盆的磁共振成像。
Magnetic resonance annual
Pub Date : 1987-01-01
C E Spritzer, H Y Kressel, D Mitchell
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引用次数: 0
Relaxometry of magnetic resonance imaging contrast agents. 磁共振成像造影剂的松弛测量。
Magnetic resonance annual
Pub Date : 1987-01-01
S H Koenig, R D Brown
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引用次数: 0
Magnetic resonance imaging at very high fields: current status. 极高磁场下的磁共振成像:现状。
Magnetic resonance annual
Pub Date : 1987-01-01
D M Kramer, D W Kormos, H N Yeung
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引用次数: 0
Magnetic resonance imaging in musculoskeletal primary malignant tumors. 磁共振成像在肌肉骨骼原发性恶性肿瘤中的应用。
Magnetic resonance annual
Pub Date : 1987-01-01
D Vanel, R Di Paola, G Contesso
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引用次数: 0
Magnetic resonance imaging for pediatric diagnosis. 磁共振成像在儿科诊断中的应用。
Magnetic resonance annual
Pub Date : 1987-01-01
R C Brasch
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引用次数: 0
Magnetic resonance imaging of cerebral ischemia and infarction. 脑缺血和脑梗死的磁共振成像。
Magnetic resonance annual
Pub Date : 1987-01-01
W Kucharczyk, M Brant-Zawadzki

In summary, then, the major strength of MRI in evaluating cerebral ischemia is in the sensitivity that this methodology provides for detection of the disease process. However, it must be realized that edema is a nonspecific event related to various insults affecting the brain. There is still an uncertain capability of MRI in separating acute hemorrhagic from acute ischemic events. The superior sensitivity of MRI should help in investigations aimed at evaluating various forms of intervention in acute ischemia. Because some of these acute changes are at the biochemical rather than morphologic level, proton MRI alone probably will be insufficient to explore numerous variables. For this reason, the potential offered by MRS in cerebral ischemia research and in clinical settings is important. Vascular imaging is relatively complex. Several techniques show promising results but at the present time have poor resolution in comparison to ultrasound and angiography. For the immediate future, they will remain investigational.

综上所述，MRI在评估脑缺血方面的主要优势在于该方法为检测疾病过程提供的敏感性。然而，必须认识到水肿是一种与影响大脑的各种损伤有关的非特异性事件。MRI在区分急性出血和急性缺血事件方面的能力仍不确定。MRI的高灵敏度有助于评估急性缺血的各种干预形式。由于这些急性变化中的一些是在生化水平而不是形态学水平，质子MRI单独可能不足以探索许多变量。因此，MRS在脑缺血研究和临床应用中的潜力是非常重要的。血管成像相对复杂。几种技术显示出有希望的结果，但目前与超声和血管造影相比，分辨率较差。在不久的将来，他们将继续进行调查。
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引用次数: 0
Head and neck hemorrhage. 头颈部出血。
Magnetic resonance annual
Pub Date : 1987-01-01
J M Gomori, R I Grossman
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引用次数: 0
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