Question 2967
{"accessible":false,"alternatives":[{"id":14441,"text":"higher spatial resolution"},{"id":14442,"text":"higher signal-to-noise"},{"id":14443,"text":"shorter scan times"},{"id":14444,"text":"less susceptible to magnetic field inhomogeneities"}],"archived":false,"correctAlternativeId":14441,"explanation":"\u003cp\u003eMulti-voxel techniques sample a voxel of tissue and use multiple phase encoding gradients to separate the signal (and subsequent spectra) into smaller voxels. Single voxel techniques provide no spatial resolution.\u003c/p\u003e\u003cp\u003eMulti-voxel sequences have reduced signal-to-noise, prolonged scan times (because of the phase encoding steps) and are more susceptible to changes in the local magnetic field (as phase encoding requires a homogenous field to accurately localize signal).\u003c/p\u003e","id":2967,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2968","nextQuestionPath":null,"relatedArticles":[{"id":22553,"title":"Acquisition time","link":"/articles/acquisition-time?lang=us"},{"id":22558,"title":"MRI physics","link":"/articles/mri-physics?lang=us"}],"alsoUsedIn":[{"id":1928,"kind":"Course","title":"Imaging Physics: MRI - page 1928","link":"https://radiopaedia.org/courses/imaging-physics-mri/pages/1928"}],"stem":"\u003cp\u003eWhich of the following is an advantage of multi-voxel sequences over single-voxel sequences in MR spectroscopy?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2967"}],"attemptsPercentages":[{"alternativeId":"14442","percentage":22},{"alternativeId":"14443","percentage":22},{"alternativeId":"14444","percentage":21},{"alternativeId":"14441","percentage":35}],"promptToLogin":false,"questionManager":false,"articleId":"mr-spectroscopy"}