The best imaging test for ankylosing spondylitis is Magnetic Resonance Imaging (MRI). An MRI can provide detailed images of the affected areas, allowing for more accurate diagnosis and treatment. MRI can detect inflammation in the joints and spine, which is often seen in patients with ankylosing spondylitis. Additionally, MRI can help to identify structural changes, such as fusion of the vertebrae, as well as bone erosions, which can be caused by the disease. MRI also provides detailed images of the soft tissues, such as the ligaments and tendons, as well as any bony abnormalities, which can be important in the diagnosis and management of ankylosing spondylitis. Finally, MRI can help to identify any other associated conditions, such as sacroiliitis, which can be associated with ankylosing spondylitis.
Overall, MRI is the best imaging test for ankylosing spondylitis as it provides detailed images of the affected areas, allowing for more accurate diagnosis and treatment.