Intracranial aneurysms constitute a common pathological entity, affecting approximately 1–8% of the general population. Their early detection is essential for their prompt treatment. Digital subtraction angiography is considered the imaging method of choice. However, other noninvasive methodologies such as CTA and MRA have been employed in the investigation of patients with suspected aneurysms. MRA is a noninvasive angiographic modality requiring no radiation exposure. However, its sensitivity and diagnostic accuracy were initially inadequate. Several MRA techniques have been developed for overcoming all these drawbacks and for improving its sensitivity. 3D TOF MRA and contrast-enhanced MRA are the most commonly employed techniques. The introduction of 3 T magnetic field further increased MRA's sensitivity, allowing detection of aneurysms smaller than 3 mm. The development of newer MRA techniques may provide valuable information regarding the flow characteristics of an aneurysm. Meticulous knowledge of MRA's limitations and pitfalls is of paramount importance for avoiding any erroneous interpretation of its findings.
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机译：颅内动脉瘤是一种常见的病理实体，大约影响了总人口的1–8％。早期发现对于及时治疗至关重要。数字减影血管造影被认为是首选的成像方法。然而，其他的非侵入性方法，如CTA和MRA，已被用于调查可疑动脉瘤的患者。 MRA是一种不需要放射线照射的非侵入性血管造影术。但是，其灵敏度和诊断准确性最初不足。已经开发了几种MRA技术来克服所有这些缺点并提高其灵敏度。 3D TOF MRA和增强对比度的MRA是最常用的技术。 3 T磁场的引入进一步提高了MRA的灵敏度，允许检测小于3 mm的动脉瘤。较新的MRA技术的发展可能会提供有关动脉瘤流动特征的有价值的信息。对MRA的局限性和陷阱的透彻了解对于避免对其结果进行任何错误解释至关重要。
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