Magnetic Resonance Imaging (MRI) Practice Test

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How does increasing the field of view (FOV) affect image resolution?

Increases resolution
No effect on resolution
Decreases resolution
Improves contrast without affecting resolution

The correct answer is: Decreases resolution

Increasing the field of view (FOV) in MRI typically leads to a decrease in image resolution. This occurs because resolution is defined as the ability to distinguish fine details within the image. When the FOV is enlarged, the number of pixels used to create the image remains the same, which causes the same pixel density to cover a larger area. As a result, the individual pixels become larger, which lowers the resolution and makes it more challenging to discern small structures or details within the imaged area. Understanding this principle is critical in MRI practice, as operators must carefully consider the balance between FOV and the desired resolution based on the clinical situation. For example, a larger FOV might be beneficial for capturing an entire organ, but it may sacrifice the detailed visualization necessary to assess smaller lesions or delicate anatomy. Thus, the impact of FOV on resolution is a vital consideration in the planning of MRI protocols to achieve optimal imaging results.