What type of imaging technique would be least effective for evaluating fractures?

MRI is least effective for evaluating fractures compared to the other imaging modalities listed. While MRI excels at visualizing soft tissues, ligaments, and cartilage, it is not typically the first choice for identifying bony abnormalities such as fractures. Fractures are often visible on X-rays, which provide a clear image of the bone structure, and CT scans can offer a detailed view of complex fractures, particularly in areas such as the spine or pelvis. Ultrasound can also be useful in certain cases, particularly in pediatrics or to assess soft tissue around a fracture. However, MRI's primary strength in soft tissue evaluation limits its effectiveness in directly assessing bone fractures, making it the least suitable option in this context.