Question 252
{"accessible":false,"alternatives":[{"id":1221,"text":"decreased mean transit time (MTT)"},{"id":1222,"text":"decreased cerebral blood volume (CBV)"},{"id":1223,"text":"decreased time to peak (TTP)"},{"id":1224,"text":"decreased cerebral blood flow (CBF)"},{"id":1225,"text":"decreased time to maximum (T-max)"}],"archived":false,"correctAlternativeId":1224,"explanation":"\u003cp\u003eDecreased CBF occurs in both core and penumbra. It is possible to distinguish core and penumbra by using a relative CBF threshold (e.g. \u0026lt;30%) however you can't do that by eye.\u0026nbsp;\u003c/p\u003e\u003cp\u003eBoth core and penumbra have increased MTT, T-max and TTP.\u0026nbsp;\u003cbr\u003ePenumbra can have increased or normal\u0026nbsp;CBV\u003cbr\u003e\u0026nbsp;\u003c/p\u003e","id":252,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1768","nextQuestionPath":null,"relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eOn CT perfusion, the ischemic penumbra of a cerebral infarct has...\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/252"}],"attemptsPercentages":[{"alternativeId":"1221","percentage":12},{"alternativeId":"1224","percentage":55},{"alternativeId":"1222","percentage":21},{"alternativeId":"1223","percentage":7},{"alternativeId":"1225","percentage":5}],"promptToLogin":false,"questionManager":false,"articleId":"ischemic-penumbra"}