Question 790
{"accessible":false,"alternatives":[{"id":4000,"text":"decreasing contrast and patient radiation dose"},{"id":4001,"text":"increasing contrast and patient radiation dose"},{"id":4002,"text":"increasing contrast and reducing patient radiation dose"},{"id":4003,"text":"increasing contrast with no change in patient radiation dose"}],"archived":false,"correctAlternativeId":4001,"explanation":"\u003cp\u003eThe working ability of a grid is described by the\u0026nbsp;\u003cstrong\u003egrid ratio\u003c/strong\u003e, which is the ratio of the height of the lead strips to the distance between two strips (the interspace). The higher the grid ratio, the better the image contrast but at a cost of increased patient dose.\u0026nbsp;Grid ratio of 8:1 is generally used for 70-90 kVp technique and 12:1 is used for \u0026gt;90 kVp technique.\u003c/p\u003e\u003cp\u003eAdapted from\u0026nbsp;\u003ca href=\"https://en.wikibooks.org/wiki/Basic_Physics_of_Digital_Radiography\"\u003eBasic Physics of Digital Radiography\u003c/a\u003e\u0026nbsp;by\u0026nbsp;Kieran Maher,\u0026nbsp;with author's permission (License:\u0026nbsp;\u003ca href=\"https://creativecommons.org/licenses/by-sa/3.0/\"\u003eCreative Commons\u0026nbsp;BY-SA 3.0\u003c/a\u003e).\u003c/p\u003e","id":790,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2751","nextQuestionPath":"/articles/grids/questions/766","relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eAn 8:1 grid is replaced with a 12:1 grid. Adjusting the exposure for this grid will have the effect of...\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/790"}],"attemptsPercentages":[{"alternativeId":"4003","percentage":7},{"alternativeId":"4002","percentage":15},{"alternativeId":"4000","percentage":11},{"alternativeId":"4001","percentage":68}],"promptToLogin":false,"questionManager":false,"articleId":"grids"}