Question 2950
{"accessible":false,"alternatives":[{"id":14367,"text":"double the image acquisition time"},{"id":14368,"text":"double the bandwidth"},{"id":14369,"text":"double the sampling interval"},{"id":14370,"text":"double the sampling rate"},{"id":14371,"text":"double the sampling time"}],"archived":false,"correctAlternativeId":14371,"explanation":"\u003cp\u003eAcquisition time = TR x # phase encoding steps x NEX x # slices (none of which are affected by increasing resolution in the frequency encoding direction).\u003c/p\u003e\u003cp\u003eBandwidth is proportional to gradient field strength and field of view.\u003c/p\u003e\u003cp\u003eSampling rate = Nyquist limit x 2 = Bandwidth (in this example bandwidth is unchanged, therefore sampling rate remains unchanged)\u003c/p\u003e\u003cp\u003eSampling interval = 1 / sampling rate (therefore, sampling interval unchanged)\u003c/p\u003e\u003cp\u003e\u003cstrong\u003e\u003cem\u003eSampling time = sampling interval x number of samples in frequency encoding direction\u003c/em\u003e\u003c/strong\u003e\u003c/p\u003e","id":2950,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2967","nextQuestionPath":"/articles/acquisition-time/questions/2947","relatedArticles":[{"id":21768,"title":"Gradient coils","link":"/articles/gradient-coils-1?lang=us"},{"id":60748,"title":"Effect of gradient strength and bandwidth on slice thickness","link":"/articles/effect-of-gradient-strength-and-bandwidth-on-slice-thickness?lang=us"},{"id":61253,"title":"Radiofrequency receiver","link":"/articles/radiofrequency-receiver?lang=us"}],"alsoUsedIn":[{"id":1927,"kind":"Course","title":"Imaging Physics: MRI - page 1927","link":"https://radiopaedia.org/courses/imaging-physics-mri/pages/1927"}],"stem":"\u003cp\u003eWhat effect will doubling the matrix size in the frequency encoding axis have?\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/2950"}],"attemptsPercentages":[{"alternativeId":"14370","percentage":29},{"alternativeId":"14371","percentage":26},{"alternativeId":"14367","percentage":17},{"alternativeId":"14369","percentage":8},{"alternativeId":"14368","percentage":19}],"promptToLogin":false,"questionManager":false,"articleId":"acquisition-time"}