CAMRT Radiography Practice Exam

What is the effect of increasing the scan field of view?

1. Increases the range of HU displayed on the image

2. Decreases the pixel size

3. Decreases the display field of view

4. Increases the number of detector cells collecting data

The correct answer is: Increases the number of detector cells collecting data

Increasing the scan field of view primarily affects the number of detector cells that are engaged during the imaging process. When the scan field of view is expanded, a larger area of the patient's anatomy is included in the imaging. This enlargement translates to a greater number of detector cells collecting data, which ultimately results in a more comprehensive representation of the scanned area. Moreover, this increase in detector involvement allows for a more detailed and potentially higher-resolution image, as more information is gathered. This is particularly beneficial in diagnostic imaging, where broader coverage can lead to better visualization of structures and pathologies that may be present. In contrast, options that refer to displaying a range of Hounsfield Units, the pixel size, and the display field of view would not directly relate to the increase in the scan field of view in this context. Each of these options focuses on different aspects of imaging parameters rather than the direct impact of expanding the scan area itself. Therefore, the correlation between the scan field of view and the number of detector cells is the most accurate understanding within radiography practice.