Heilmaier Christina, Theysohn Jens M, Maderwald Stefan, Kraff Oliver, Ladd Mark E, Ladd Susanne C
Department of Diagnostic and Interventional Radiology, HELIOS Klinikum, Krefeld, Germany.
Bioelectromagnetics. 2011 Dec;32(8):610-9. doi: 10.1002/bem.20680. Epub 2011 May 19.
A study on subjective perception has been carried out in order to gain further insight into subjective discomfort and sensations experienced during 7 T magnetic resonance imaging (MRI). This study provides information about subjective acceptance, which is essential if 7 T MRI is to become a clinical diagnostic tool. Of 573 subjects who underwent 7 T MRI, 166 were also examined at 1.5 T, providing a means of discriminating field-dependent discomfort. All subjects judged sources of discomfort and physiological sensations on an 11-point scale (0 = no side effects, 10 = intolerable side effects) and scores were analyzed separately for exam phases, with and without table movement at each field strength. Results revealed that 7 T MRI was, in general, judged more uncomfortable than 1.5 T; however, most subjects rated the effects as being non-critical (mean scores between 0.5 and 3.5). Significant differences were detected regarding vertigo and sweating between subjects positioned "head-first" and "feet-first" at 7 T (worse in "head-first") and between 7 and 1.5 T (worse at 7 T), with the effects being more pronounced in the moving compared to the stationary table position. The most unpleasant factor at 7 T was the extensive examination duration, while potentially field-dependent sensations were rated less bothersome. In summary, our study indicates that although certain sensations increase at 7 T compared to 1.5 T, they are unlikely to hinder the use of 7 T MRI as a clinical diagnostic tool.
为了更深入了解在7T磁共振成像（MRI）过程中经历的主观不适和感觉，开展了一项关于主观感知的研究。这项研究提供了有关主观接受度的信息，而这对于7T MRI成为临床诊断工具至关重要。在接受7T MRI检查的573名受试者中，有166人也接受了1.5T的检查，这提供了一种区分场依赖性不适的方法。所有受试者都根据11分制（0 = 无副作用，10 = 无法忍受的副作用）对不适来源和生理感觉进行评分，并分别分析每个检查阶段的得分，包括在每个场强下有无检查床移动的情况。结果显示，总体而言，7T MRI被认为比1.5T更不舒服；然而，大多数受试者将这些影响评为不严重（平均得分在0.5至3.5之间）。在7T时，“头先入”和“脚先入”体位的受试者之间在眩晕和出汗方面检测到显著差异（“头先入”更严重），以及在7T和1.5T之间（7T更严重），与检查床静止相比，移动时这些影响更明显。7T时最令人不快的因素是检查时间过长，而潜在的场依赖性感觉被评为不那么麻烦。总之，我们的研究表明，尽管与1.5T相比，7T时某些感觉会增加，但它们不太可能阻碍7T MRI作为临床诊断工具的使用。
