A computed tomography (CT) imaging system includes at least one processing unit (110) configured to receive operator inputs that include a modified system feature and a clinical task with a task object, and also operator inputs to determine a task-based image quality (IQ), To receive metrics. The task-based IQ metric represents a desired overall image quality of image data for performing the clinical task. The image data is acquired using a reference system feature. The at least one processing unit (110) is further configured to determine an exposure control parameter based on the task object, the modified system feature, and the task-based IQ metric. The at least one processing unit (110) is further configured to direct the x-ray source (104) to generate the x-ray beam (106) during the CT scan, wherein either the tube current and / or the tube potential during the CT scan is a function of the exposure control parameter is or are.
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